Young-Soo Yoon

Gachon University | kyungwon · Department of Environmental and Energy Engineering

All-solid-state lithium metal batteries have attracted considerable attention as the next-generation energy storage devices with high energy density and safety. This review focuses on the properties of interfaces between solid electrolytes and lithium electrodes, which are important for realizing all-solid-state lithium metal batteries. Various fun...

A nanofiber mat of styrene−co−vinylbenzyl chloride−co−acrylonitrile copolymer as an anion exchange membrane (AEM) was synthesized via the electrospinning of organic reaction mixtures. The synthesized membranes were characterized using FT-IR spectroscopy for structural analysis. The AEM demonstrated a high ionic conductivity mainly due to the phase...

Recently, wearable and flexible electrochemical sensors have attracted tremendous attention due to health monitoring and diagnostics for humans [1]. Such wearable devices will be able to provide low-cost, easy-to-use, and mass production for in-situ detection or point-of-care applications. Urea is an essential biomarker for the diagnosis of healthy...

Although considerable effort has been devoted to developing bifunctional electrocatalysts with enhanced atomic utilization in ethanol fuel cells, significant progress in this field has been hindered by notable drawbacks of the electrocatalysts, such as low stability, poor activity, and inefficient repeatability for multiple startup and shutdown cyc...

The multilayered swaging and drawing process using raw Zr-alloy cladding is very simple, can be performed at room temperature (15-25 ℃), and enables mass productivity. In this study, we developed a pseudo-single tube with double layers (PSTD), using a thin stainless-steel (SS316L) tube and raw Zr-alloy cladding, which is not easily accessible to a...

This article reviewed the near-term development status of accident tolerant fuel (ATF) cladding to increase the safety of nuclear power generation. The key to near-term development is to secure enhanced accident tolerance beyond the performance of zirconium alloys without compromising the stability of zirconium alloys during normal operation. The n...

The fuel cell industry is the most promising industry in terms of the advancement of clean and safe technologies for sustainable energy generation. The polymer electrolyte membrane fuel cell is divided into two parts: anion exchange membrane fuel cells (AEMFCs) and proton exchange membrane fuel cells (PEMFCs). In the case of PEMFCs, high-power dens...

This article reviews the technological trends in lithium-phosphorous-oxynitride (LiPON)-film-based thin-film batteries. LiPON films have been actively used in thin-film batteries containing lithium anodes because of their excellent contact stability with lithium and the advantages offered for thin-film formation. In addition, studies that have focu...

Wearable and flexible electrochemical sweat analysis for monitoring health-related urea concentrations with high sensitivity and selectivity is highly required for individual medical care and disease diagnosis. Herein, we report a sensitive and selective sweat sensor based on a flexible NiCu(OOH)/polystyrene (PS) electrode to detect a urea biomarke...

Fossil fuels are widely used around the world, resulting in adverse effects on global temperatures. Hence, there is a growing movement worldwide towards the introduction and use of green energy, i.e., energy produced without emitting pollutants. Korea has a high dependence on fossil fuels and is thus investigating various energy production and stor...

A free-standing catalyst electrode for the urea oxidation reaction (UOR) and hydrogen evolution reaction (HER) in a urea electrolysis cell was synthesized by electroplating a Ni-Fe alloy onto carbon felt, followed by phosphidation (P-NiFe@CF). The prepared P-NiFe@CF catalyst consisted of Ni5P4, NiP2, and FeP with 3D flower-like P-NiFe architecture...

The influence of heat treatment on the material properties and electrochemical properties of CuV2O6, as a candidate cathode for thermal batteries, was evaluated, where the discharge capacity and open-circuit voltage were measured. The properties of CuV2O6 calcined at different temperatures were determined using X-ray diffraction (XRD), scanning ele...

Urea electrooxidation has attracted increasing attention because urea is an essential biomarker for diagnosing kidney conditions. Most urea sensors are based on the enzyme; however, enzyme-based sensors have a moderately complicated assembling method [1] due to poor stability. Different from the bulk diffusion of urea in the enzymatic urea oxidatio...

This data provides the observation of the interface between lithium phosphorus oxynitride(LiPON) film and lithium layer. In other words, the shape of the lithium electrode protected by the LiPON film after the dissolution/precipitation cycle is provided as images. Also, for clear interpretation of these images, the shape of lithium formed between L...

An efficient and effective process for the production of high-performance anion exchange membranes (AEMs) is necessary for the commercial application of fuel cells. Therefore, in this study, quaternized poly vinylbenzyl chloride (QVBC) and polysulfone were composited with glycidyltrimethylammonium-chloride-quaternized chitosan (QCS) at different ra...

An anode bimetallic catalyst comprising Ni-Pd alloy nanoparticles was loaded on acid-treated multi-walled carbon nanotubes (MWCNTs) for application in a direct urea fuel cell. The bimetallic catalyst and MWCNTs were synthesized by a hydrothermal method at 160°C for 5 h. To reduce the catalyst particle size, alkaline resistance, and facilitate their...

Nickel-based urea biosensors have been proven to be a useful prescreening technology due to their excellent electrocatalyst activities on urea. However, the behavior of nickel-based nonenzymatic urea biosensors showed limitations in identifying the presence of urea molecules in biomarkers such as urine and serum because the catalytic response of ni...

Lithium phosphorous oxynitride (LiPON) is a thin film solid electrolyte with an amorphous structure and is the most applied material in the thin film battery industry. Herein, LiPON and LiPON/LiPO thin films were directly deposited on a Li foil by the RF sputtering method and evaluated as a protective film to improve the stability of the Li anode....

We suggest an alternative to conventional coating methods for accident-tolerant fuel (ATF) cladding. A Zircaloy-4 tube was inserted into metal tubes of different materials and the inserted tubes were subjected to physical force at room temperature. The manufactured tube exhibited a pseudo-single tube (PST) structure and had higher thermal stability...

Lithium phosphorus oxynitride (LiPON) is the most representative solid electrolyte in thin film battery applications. In addition, it has been used as an interfacial protective layer to improve the stability of cathode and anode materials. In this article, we review the effect of the process conditions on the structural and electrochemical properti...

The level of urea in urine can be a crucial biomarker to detect kidney failure, dehydration, renal function, and hepatic failure. [1] Thus, rapid and accurate sensing of urea is essential in a diagnostic clinic, especially for point-of-care testing devices (POCT). Paper-based analytical devices have been demonstrated as POCT due to its disposabilit...

Urea is an essential biomarker for the diagnosis of healthy kidneys because urea, a protein metabolite, is formed by the function of kidneys and is excreted into the urine. The urea level in human blood is between 10.2 and 49.8 mg/dL (equivalent to 3mM-7mM) [1]. When the concentration of urea in serum increases up to 720–900 mg/dL, kidney dialysis...

Tri-metallic MnNiFe alloy nanoparticles with four different Mn:Ni:Fe weight ratios (0.5:2.0:0.5, 0.5:1.0:0.5, 1.0:1.0:1.0, and 2.0:0.5:2.0) on reduced graphene oxide (rGO) supports were synthesized using a one-pot hydrothermal method. The as-prepared catalysts were characterized by X-ray diffraction, inductively coupled plasma-mass spectroscopy, Br...

In this study, a textile-based stretch sensor with a polymer/conductor/polymer structure was fabricated using a paste of multiwalled carbon nanotubes (MWCNTs) as the conductive material. A simple and practical method that integrates with the manufacturing methods employed in the garment industry was designed. The stretch sensor showed varying perfo...

A novel and unique PtSc0.5Ni/MoS2@graphene catalyst possessing hybrid characteristics is prepared. Initially, three-dimensional nanoflower-like structures of MoS2 are deposited onto graphene sheets, and then PtScNi nanoparticles are grafted onto the MoS2@graphene support. For optimization, catalysts with different doping ratios (x = 0.2, 0.5, and 1...

In this study, the structural and electrochemical properties of post-annealed lithium phosphorus oxynitride (LiPON) thin films were confirmed. LiPON thin films were deposited using a radio-frequency sputtering method, and post-annealing was performed in the temperature range of 100–400 °C. Compared with the initial as-depo state, the impedance decr...

In this study, we fabricated a cathode with lower amounts of additive materials and higher amounts of active materials than those of a conventional cathode. A thermal battery was fabricated using FeS2 treated foam as the cathode frame, and its feasibility was verified. X-ray diffraction, transmission electron microscopy, and scanning electron micro...

The thermoelectric transport properties of Bi/Sn and Bi/Sb core/shell (C/S) nanowires grown by the method of on-film formation of nanowires were systematically investigated. The electrical conductivity and Seebeck coefficient of nanowires with different diameters were measured as a function of the temperature. The contribution of Sn and Sb shells t...

Urea in the urine, protein metabolism, is present in the final product of human. The level of urea is a crucial biomarker that can assess the metabolic activity of humans such as the liver and renal function. [1] A high level of urea in the urine can result in kidney failure, dehydration, and gastrointestinal bleeding, while a low level can lead to...

With the development of technology in healthcare systems, interest in a wearable, portable, and even implantable device is growing, allowing health indicators to be read by direct skin contact [1], [2]. The non-invasive sensing platform overcomes the inconvenience of the conventional monitoring system and enabling easy and quick medical diagnosis i...

Existing energy sources based on fossil fuel is an obstacle for environmental sustainability, and there is a concern regarding the depletion of fossil fuel resources [1], [2]. Therefore, it is essential to develop new alternative energy sources. As a safe and effective method of generating power, the conversion of natural biomass to electricity in...

Recently emerging materials for advancing gas sensor technology have potentialized versatile applications of a sensor in the society of safety, health, environmental protection and much more [1]. In accordance with significant progress of chemical and physical approaches, gas sensing materials are not limited to metal oxide but include various 2D n...

A solid solution Pd–Ni alloy co-sputtered on carbon paper (Pd–Ni/C) is explored as a catalyst in the flow-through porous anode of a direct urea fuel cell (DUFC). The catalytic performances of urea electro-oxidation in an alkaline medium are investigated by cyclic voltammetry and chronoamperometry. In order to minimize the effect of morphological va...

The sensitive detection of explosive and flammable gases is an extremely important safety consideration in today's industry. Identification of trace amounts of nonpolar analytes at ambient temperatures, however, is still a challenge because of their weak adsorption, and very few studies have been able to achieve it via a chemiresistive mechanism. H...

A new state‐of‐the‐art NiMnCo anode co‐catalyst has been prepared and investigated with the aim of reducing dependence on expensive Pt catalysts in hydrogen‐based fuel cells. The as‐prepared co‐catalyst exhibited a three dimensional (3D) nanoneedle structure, which was observed using transmission electron microscopy. Pt nanoparticles (approximately...

The utilization of urea has attracted more attention due to its various applications such as fuel cell, hydrogen production, wastewater remediation, and electrochemical sensors. [1] Especially, urea is a crucial biomarker to detect various human metabolic disorders such as renal function and liver disease. Therefore, the measurement of the urea lev...

Urea is an end-product of the metabolism of nitrogenous compounds, which can be detected in the blood as well as urine [1]. Ammonia catabolized by protein metabolism is converted into urea by liver and kidneys [2]. Consequently, the concentration of urea in the urine or blood is a suitable biomarker that monitors liver and kidney function. If a sen...

By virtue of the technology in ubiquitous computing and smart textile, gas sensor with wearability has been developed to play an imperative role in improving future healthcare. [1] The sensor revolution can significantly impact on outpatient care and management of chronical diseases by offering real-time condition monitoring. The combination of man...

In this study, lithium fluoride (LiF) was deposited on lithium (Li) metal by thermal evaporation in order to reduce degradation of Li metal batteries caused by growth of Li dendrites. Li | Li symmetric cells were used to measure impedance changes, overvoltage after cycling at 1 mA/cm² and 1 mAh/cm², and surface images after 100 cycles. In addition,...

The polymer binder, poly(imide-co-siloxane) (PIS), was synthesized and applied to form a thin cathode layer of composites for a thermal battery that has an unusually high operating temperature of 450 °C. The PIS was prepared through cross-linking of the polyimide with polysiloxane. The morphology of FeS2/PIS composites showed that FeS2 particles wa...

Research carried out over the last few decades has shown that nanomaterials for energy storage and conversion require higher performance and greater stability. The nanomaterials synthesized by diverse techniques, such as sol-gel, hydrothermal, microwave, and co-precipitation methods, have brought energy storage and conversion systems to the center...

The polymer binder, poly(imide-co-siloxane) (PIS), was synthesized and applied to form a thin cathode layer composites for a thermal battery that has an unusually high operating temperature of 450 °C. The PIS was prepared through cross-linking of the polyimide with polysiloxane. The morphology of FeS2/PIS composites showed that FeS2 particles was c...

Few studies have investigated the gas-sensing properties of graphene oxide/titanium dioxide (GO/TiO2) composite combined with photocatalytic effect. Room temperature gas-sensing properties of the GO/TiO2 composite were investigated towards various reducing gases. The composite sensor showed an enhanced gas response and a faster recovery time than a...

Two-dimensional (2D) nanomaterials have demonstrated great potential in the field of gas sensing due to their layered structures. Especially for 2D transition metal dichalcogenides (TMDs), inherent high surface areas and their unique semiconducting properties with tunable band gaps make them compelling for sensing applications. In combination with...

The lithium metal battery has attracted considerable attention as the ultimate lithium secondary battery for high energy density. However, safety issues and battery performance deterioration due to the growth of lithium dendrites have hampered the practical use of lithium metal batteries. Recently, lithium fluoride has been considered as a lithium...

A Composite cathode without polymer binder was prepared by a one-step sintering method employing spark plasma sintering (SPS) of laminated LiCoO2 and Li3BO3 pellets. The amorphous Li3BO3 solid electrolyte melted during the sintering process. For better characterization of the composite cathode, a liquid electrolyte was used in the battery test. How...

Ni–Cu alloy nanoparticles loaded onto ZnO– coated multi-walled carbon nanotubes (MWCNTs) were evaluated as anode catalysts in direct urea fuel cells. The Ni–Cu/[email protected] catalyst was synthesized by a two-step hydrothermal process. Uniform distribution of the spherical Ni–Cu alloy nanoparticles on the [email protected] surface was realized,...

A platinum-cobalt-iron ternary alloy is deposited on a TiO2─ coated multi-walled carbon nanotube support (PtCoFe/MWCNT─TiO2) using a two-step hydrothermal method and evaluated as an anode catalyst for direct methanol fuel cells. Catalysts with different weight ratios of Pt:Co:Fe (3:1:1, 1:1:1 and 1:3:3) on MWCNT─TiO2 are prepared and examined. The...

Silver coated ZnO nanorods and nanoflakes with different crystallographic orientations were synthesized by a combination of sputter deposition and solution growth process. Catalytic properties of morphology‐dependent Ag/ZnO nanostructures were then investigated for urea sensors without enzyme. Ag/ZnO nanorods on carbon electrodes exhibit a higher c...

Wearable electronics have evolved from life-supporting devices for solders to fashion accessories such as smart watches. Wearable devices are not limited to on-body devices because they can be further transformed by integrating with other surfaces such building and vehicles. Accordingly, the market demand for wearables has greatly increased, and th...

The protective coating layer for accident tolerance fuels (ATF) will offer a fuel efficient, enhanced oxidation resistance of zirconium alloy, and safe operation by active cooling of the reactor. The various coating methods on the surface of zirconium alloy such as physical vapor deposition, chemical vapor deposition, and cold spray have been tried...

Urea is the nitrogenous waste substance of metabolism in the human body, and abnormal urea levels are associated with a variety of diseases such as renal failure, dehydration, and hepatic issues. For example, urea production and renal processing of urea, along with the causes of increased and reduced plasma/serum urea concentration are a major conc...

In recent years, there has been growing interest in utilization of urea in terms of disposal of industrial urea wastewater and renewable energy. Urea with high energy density of 16.9 MJ/L corresponding to 10.1 wt% of hydrogen is considered as an attractive material that can produce hydrogen as the sources for fuel cells [1]. Urea also has the advan...

Recently, much interest has been placed on wearable electronics, for example wearable gas sensor. With wearability, gas sensor will be more pragmatic to be utilized for everyman to monitor health conditions by checking their breath and/or by protecting themselves ubiquitously from hazardous gases. [1] To improve the performance of wearable gas sens...

Urea has attracted more attention because of its various potential applications such as hydrogen production, fuel cell, fertilizer, and electrochemical sensors.[1] In particular, as an end-product of human metabolism, urea is important for analyzing various metabolic disorders such as liver disease and renal function. Therefore, sensing the urea le...

Chromium and chromium nitride were selected as potential barriers to prevent fuel-clad chemical interaction (FCCI) between the cladding and the fuel material. In this study, ferritic/martensitic HT-9 steel and misch metal were used to simulate the reaction between the cladding and fuel fission product, respectively. Radio frequency magnetron sputte...

Marine emissions of Volatile Organic Compounds (VOCs) have received much attention because the International Maritime Organization (IMO) requires the installation of vapour emission control systems for the loading of crude oils or petroleum products onto ships. It was recently recognised that significant corrosion occurs inside these vapour emissio...

A new hybrid composite proton exchange membrane has been synthesized from dihydrogen phosphate functionalized imidazolium ionic liquid (IL-H2PO4), graphene oxide, and Nafion 117 solution. The chemical structure and thermal stability of the dihydrogen phosphate functionalized imidazolium ionic liquid (IL-H2PO4) have been analyzed by ¹H nuclear magne...

This data provides the fuel cell performance of Nafion based hybrid membranes containing GO and dihydrogen phosphate functionalized ionic liquid (IL) at 70 °C under anhydrous condition. Readers are requested to go through the article entitled “Nafion® based hybrid composite membrane containing GO and dihydrogen phosphate functionalized ionic liquid...

The polymer electrolyte membrane fuel cell(PEMFC) is being considered as a clean source of power for the application of future energy owing to its high-power density, lower operating temperature than other fuel cells, and environment-friendliness [1]. For commercialization, the cost of bipolar plates (BPs) is a crucial factor among cell components,...

The level of biological molecules, such as urea, glucose, dopamine, and creatinine has been measured by various sensing platform for biomedical applications. For example, the urea level deviated from the reference values which causes several diseases such as renal and hepatic issues, is closely related to our life. Monitoring of urea is also import...

ZnNiSnO4 nanorods (ZNTO) have been synthesized by a hydrothermal method to be used as an anode material for Li ion battery for the first time. As synthesized ZNTO nanorods are characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and X-ray photo electron spectroscopy (...

Hollow nanocubes of sodium nickel fluoride deposited on multiwall carbon nanotubes (SNF–MWCNT) have been synthesized by a facile microwave assisted process using in situ templated mechanism. Ionic liquid (IL) played an important role in synthesizing the catalysts. Physicochemical properties of the catalysts were characterized by X-ray diffraction (...

FeS2-MWCNTs (Multi-Walled Carbon NanoTubes) composite without using an organic binder was used as a thin cathode for thermal batteries. A thin cathode with FeS2-MWCNTs composite exhibited good mechanical strength without an organic binder. A discharge evaluation of the thin cathode with FeS2-MWCNTs composite revealed a discharge capacity 2.3 times...

An efficient all-solid-state battery (ASSB) was designed using a hybrid system composed of a thin film solid electrolyte and a thick composite electrode fabricated by spark plasma sintering (SPS). The optimized parameters for preparing the composite electrode were identified, including the optimal SPS conditions to inhibit decomposition of the acti...

Herein, we describe a microwave-assisted hydrothermal process to synthesize α-Fe2O3 nanotubes/SnO2 nanorods/reduced graphene oxide (FNT/S/RGO) for application as a high-performance anode in lithium-ion batteries (LIBs). The composite products exhibit anisotropic growth because of heteronucleation and the preferred orientation of SnO2. SnO2 nanorods...

Many new functional materials have been studied for efficient production and storage of energy. Many new materials such as sodium-based and sulfide-based materials have been proposed for energy storage, but research on Li batteries is still dominant. Due to the influence of environmental concerns regarding nuclear energy, interest in and research o...

Thin cathodes for thermal batteries with good homogeneity and a reproducible thickness were prepared using a tape-casting process. A single cell fabricated with a 100 ㎛ thick cathode using tape-casting process exhibited a specific capacity of 1934.08 Asec/g. In contrast, a single cell fabricated with a pellet type 500 ㎛ thick cathode demonstrated a...

Sputtered Ag on zinc oxide (ZnO) nanorod-structures grown on a carbon paper substrate were investigated as an electrocatalyst for non-enzymatic oxidation of urea. The Ag/ZnO nanorod-modified electrodes were characterized by cyclic voltammetry and chronoamperometry in 1 M KOH electrolyte with 0.33 M urea. The synergetic electrochemical performance d...

In this paper, we report the first successful fabrication of CdWO4 thin film scintillators deposited on quartz glass substrates by using an electron-beam physical vapor deposition method. The films were dense, uniform, and crack-free. CdWO4 thin-film samples of varying thicknesses were investigated by using structural and optical characterization t...

Li2S-P2S5 thin-film solid electrolytes are synthesized by using room-temperature thermal evaporation for use as lithium-ion conductors for all-solid-state Li-ion batteries. The local structures of 75.51Li2S:24.49P2S5 and 77.64Li2S:22.36P2S5 prepared in this way have hetero units that facilitate lithium-ion mobility. The lithium-ion conductivity at...

Poly(vinyl chloride-co-vinyl acetate) functionalized with the imidazolium cation was synthesized for anion exchange membranes. The chemical structure of the membrane was confirmed by 1H NMR and FTIR analyses. Scanning electron microscopy and thermogravimetric analyses were performed to ascertain the surface and thermal properties of the membrane. T...

Alpha-phase iron oxide nanoparticles (α-NPs), α-iron oxide hollow nano-barrels (α-HNBs), and α-HNBs on reduced graphene oxide (α-HNBs/RGO) for Li-ion batteries (LIBs) were synthesized by a time-efficient microwave method to improve the low electrical conductivity of iron oxide and exploit the porous structure of RGO, which prevents the volume expan...

Core-shell [email protected]/* */ nanoparticles were synthesized on multiwall carbon nanotubes by using an ionic-liquid-assisted polyol synthesis method. The catalysts were characterized by using transmission electron microscopy. The synthesized catalysts were very active towards electrocatalytic oxidation of methanol. The catalytic activities were...

A blend of poly(vinyl alcohol) (PVA) with diglycidyl ether of bisphenol-A (DGB) in the presence of sulfosuccinic acid (SSA) was investigated as hydrolytically-stable proton-conducting membrane. The PVA modification was carried out by varying the DGB:SSA ratio (20:20, 10:20, and 5:20). A nanocomposite of the blend (20:20) was prepared with sulfonate...