Jeyong Yoon

cowell · Quality

The electrochemical hydrogenation (ECH) of furfural (FF) offers a promising pathway for the production of furfuryl alcohol (FA) while aligning with sustainability and environmental considerations. However, this technology has primarily been studied in half-cell configurations operating at high cell voltages and low current densities. Herein, we emp...

Prussian blue analogue (PBA) electrodes are widely used cation-selective electrodes for electrochemical desalination technologies due to their high specific capacity rates and fast kinetic properties. Despite the fact that previous studies of PBAs for electrochemical desalination have shown remarkable desalination capacity levels, they remain insuf...

Developing high‐performance and durable electrocatalysts for the oxygen evolution reaction (OER) is of utmost importance for green hydrogen production via anion exchange membrane water electrolysis (AEMWE). Herein, it is presented that a straightforward surface reconstruction strategy for preparing a robust Co‐based OER catalyst with increased mass...

Development of robust electrocatalysts for the oxygen evolution reaction (OER) underpins the efficient production of green hydrogen via anion exchange membrane water electrolysis (AEMWE). This study elucidates the factors contributing to the degradation of cobalt‐based (Co‐based) OER catalysts synthesized via electrodeposition, thus establishing st...

To produce green hydrogen using anion exchange membrane water electrolysis (AEMWE), high-performance oxygen evolution catalysts are needed. This study presents a novel strategy for increasing the intrinsic and extrinsic activities of Co-based catalysts through sequential electrodeposition of Fe and Co. In a single AEMWE cell, the double-electrodepo...

Recent advances in electrochemical desalination techniques have paved way for utilization of saline water. In particular, capacitive deionization (CDI) enables removal of salts with high energy efficiency and economic feasibility, while its applicability has been challenged by degradation of carbon electrodes in long-term operations. Herein, we rep...

Due to increasing interests in carbon neutral engineering, global market demand for lithium compounds is steadily growing, which serve as key compounds in the battery production. As a sustainable alternative for lithium compound production, electrochemical lithium recovery (ELR) is being studied extensively in recent years. However, research effort...

In wastewater treatment, the dimensionally stable anodes (DSAs) based on costly metals are currently being used for electrochlorination due to their superb chlorine evolution reaction (CER) performance. However, owing to their low OER overpotential, DSAs show poor current efficiency for CER in dilute chloride solutions (< 50 mM), which are common w...

The use of wastewater for CO2 mineralization is a promising strategy that not only addresses environmental issues (i.e., preventing greenhouse gas emissions and algal blooms by CO2 removal), but also produces economic benefits (i.e., recovery of carbonate-based minerals). In this study, we propose an innovative flow-electrode capacitive deionizatio...

Multichannel desalination batteries (MC-DBs) have been utilized to enhance the performance of battery electrodes by decoupling the electrodes (side channels) and target brackish water (middle feed channel), enabling independent control of the channels. Nevertheless, the technological level of MC-DB is at an infancy, and further understanding of the...

Electrochemical ion separation (EIONS) is attracting attention as a new ion separation technology because no by-products are generated during the process. However, conventional EIONS systems have lower selectivity for anions; it has limitations in its application to selective anion extraction. Therefore, it is necessary to develop a new EIONS syste...

Dimensionally stable anodes (DSAs) are regarded to be optimized electrodes for electrochlorination owing to their excellent electrocatalytic activity for the chlorine evolution reaction (CER). However, in dilute chloride solutions, DSAs preferentially produce oxygen rather than chlorine because of their low overpotential for oxygen evolution reacti...

Recently, reduced TiO2nanotube arraysviaelectrochemical self-doping (r-TiO2) are emerging as a good alternative to conventional dimensionally stable anodes (DSAs) due to their comparable performance and low-cost. However, compared with conventional DSAs, they suffer from poor stability, low current efficiency, and high energy consumption. Therefore...

Electrochemically reduced TiO2 nanotube arrays (r-TiO2 NTA) have emerged as an alternative that can replace the dimensionally stable anode (DSA®) due to comparable performance for chlorine evolution reaction (ClER). However, previous studies have reported applications of r-TiO2 NTA for ClER only under limited conditions (concentrated NaCl solution...

Within the last decade, in addition to water desalination, capacitive deionization (CDI) has been used for resource recovery and selective separation of target ions in multicomponent solutions. In this review, we summarize the mechanisms of selective ion removal utilizing different electrode materials, carbon and non-carbon together with or without...

Various lithium recovery technologies have been developed as securing lithium resources has become increasingly important. Among these technologies, the electrochemical lithium recovery (ELR) system is a rapid and eco-friendly extraction method that has been studied recently. In this paper, an ELR system using a spinel-type LiMn2O4 (LMO) is briefly...

The superior removal selectivity of hydrated zirconium oxide nanoparticle-impregnated porous anion exchange resin (ZAE) highlights its use as phosphate removal adsorbent. However, most research examines selective phosphate removal performance using randomly determined single content of hydrated zirconium oxide, and thus the use of the ZAE in real a...

Battery desalination (BD) is a promising next-generation desalination technology because it is environmentally benign, consumes little energy, and requires only mild operating conditions. However, the BD capacity decreases with long-term operation, which limits its use. Herein, we report a new approach to improve the BD cycling stability by coating...

Capacitive deionization (CDI) is an emerging desalination technology with an environmental-friendly operation and energy-efficient properties. However, activated carbon (AC) used for CDI electrode does not have significant preference toward anions, leading to unnecessary energy consumption for treating fluoridated water. Hence, we achieved selectiv...

Recently developed electrochemical lithium recovery systems, whose operation principle mimic that of lithium-ion battery, enable selective recovery of lithium from source waters with wide range of lithium ion (Li+) concentrations; however, physicochemical behaviors of the key component – Li+-selective electrode – in realistic operation conditions h...

Due to the rapid growth of the global electric vehicle and electronics market, lithium becomes an indispensable resource for our lifestyle, and numerous methods for securing lithium are actively attempted. For fast and environment-friendly lithium extraction, the electrochemical lithium recovery (ELR) system is studied in recent years. However, the...

Although capacitive deionization (CDI) is an energy-efficient and environment-friendly desalination technique, the severe performance decrease during long-term operation has been a critical obstacle to its practical application. Compared to various other approaches for stability improvement, the ion-exchange polymer (IEP) coating on the electrode s...

Given the global impact of the water crisis, capacitive deionization (CDI) has attracted significant research interest as a promising water treatment technology. Recently, Multi-Channel Membrane CDI (MC-MCDI) has successfully been utilized to enhance the ion removal capacity by separating the electrode channels (side channels) from the feed stream...

Nickel oxide upon free chlorine treatment has been used as a heterogeneous oxidant to eliminate aqueous organic pollutants, where oxygenation or chlorination could regenerate the oxidation capacity. In order to overcome problems associated with low regeneration efficiency and undesirable chloride ion generation, we herein investigate electrochemica...

Reversible electrochemical processes are a promising technology for energy-efficient water treatment. Electrochemical desalination is based on the compensation of electric charge by ionic species, through which the ions are immobilized and, thereby, removed from a feed-water stream flowing through a desalination cell. For decades, electrochemical d...

In article number 1909387, Jeyong Yoon, Yung‐Eun Sung, and co‐workers report capacitive deionization using heteroatom‐doped porous carbons prepared from coffee waste. The presence of nitrogen and sulfur dopants lead to rapid inversion of surface charges in the carbonaceous electrodes during desalination, which leads to high performance and stabilit...

Electrochemical desalination technologies such as capacitive deionization (CDI) and battery desalination (BD) are considered as promising brackish water desalination technologies because of their low energy consumption and environmental friendliness. However, it is a still challenge to develop an efficient way to deionize highly concentrated salt w...

Capacitive deionization (CDI) has gained a lot of attention as a promising water desalination technology. Among several CDI architectures, multichannel membrane CDI (MC-MCDI) has recently emerged as one of the most innovative systems to enhance the ion removal capacity. The principal feature of MC-MCDI is the independently controllable electrode ch...

Capacitive deionization (CDI) is a promising desalination technology because of its simple, high energy efficient, and eco-friendly process. Among several factors that can affect the desalination capacitance of CDI, wettability of the electrode is considered one of the important parameters. However, various carbon materials commonly have a hydropho...

Given that a considerably large population suffers from shortage of water, there are numerous on‐going efforts to turn seawater into freshwater, and electrochemical desalination processes—particularly capacitive deionization (CDI)—have gained significant attention due to their high energy efficiency and reliable performance. Meanwhile, carbonaceous...

Selective removal of trace arsenic is crucial for obtaining safe drinking water. Here, the selective adsorptive performance of arsenate (As(V)) on a hybrid ZMAE (nanoscale zirconium molybdate embedded a macroporous anion exchange resin) was examined. It was found that the As(V) adsorption efficiency of ZMAE was almost retained in the presence of co...

Phosphate removal is a critical issue in water treatment because excess levels of phosphate can cause severe eutrophication. Capacitive deionization (CDI), which has several advantages, such as simple, eco-friendly, and energy efficient operations, has gained attention as a potential alternative over conventional phosphate removal technologies like...

Membrane capacitive deionization (MCDI) is a modification of capacitive deionization (CDI) using ion-exchange membranes (IEM) in front of the electrodes. Electrode properties, especially the specific surface area, are known to be strongly related with desalination performance in CDI, but the effects of other properties in MCDI are not fully underst...

Electrochemically self-doped TiO2 nanotube arrays (known as reduced TiO2 nanotube arrays, r-TiO2 NTAs) are currently drawing great attention as emerging and promising materials for energy and environmental applications as they exhibit highly enhanced electrochemical properties, such as good capacitive properties and electro- and photocatalytic acti...

Flow-electrode capacitive deionization (FCDI) is a promising electrochemical desalination system owing to its superior desalination capacity in a continuously operating process. However, FCDI suffers from a lack of an effective reuse step for charged flow-electrodes for conducting continuous desalination despite several approaches such as mixing ch...

The rapidly growing interest in seawater desalination has drawn a large pool of attention among the industry for proper management of its by-product; desalination concentrate. Among the various attempts to utilize desalination concentrate, the selective extraction of lithium has received considerable attention as the industrial demand for lithium b...

Desalination technologies have heavily been investigated to utilize the abundant salt water on Earth due to the global freshwater shortage. During recent years, the desalination battery (DB) has attracted attention for its low-cost, eco-friendly, and energy-efficient characteristics. However, the current DB system is subject to inevitable performan...

Capacitive deionization (CDI) has received much attention, considered as a promising electrochemical water desalination technology. However, an obstacle to its conventional application is the limited ion removal capacity of carbon electrodes induced by the electrical double layer. Here, a novel CDI system, called multi-channel redox CDI (MC-RCDI) w...

Surface-modified EDTA-reduced graphene oxide (EDTA-rGO) membranes with high rejection rates, for monovalent ions in particular, were fabricated from graphene oxide (GO) for nanofiltration. The EDTA-rGO membrane surface was treated with oxygen plasma to enhance its water permeability (P-EDTA-rGO). The resulting P-EDTA-rGO membranes demonstrated reje...

In recent years, there have been growing interest in indoor air quality, and large efforts have been devoted to controlling the concentration of CO2 below a certain level. Lithium hydroxide (LiOH) is the most widely used material for CO2 capture due to its large adsorption capacity and fast kinetics; however, steep increase in the cost of lithium i...

Due to the steep increase in the use of mobile electronics and electric vehicles, there has been a dramatic rise in the global lithium consumption. Although seawater has been considered as an ideal source of lithium in the future, technological advances are necessary to ensure its economic feasibility because the concentration and portion of Li+ ar...

Sustainability has become a global issue that arouses the need for efficient allocation of resources such as water and energy. Over the recent decade, vast research activities were conducted to electrochemical processes, which utilize fundamentals of electrochemistry to achieve ion separation. Owing to its facile, energy-efficient, and environmenta...

Metal-organic framework (MOF)-derived carbon materials have been widely used as catalysts for a variety of electrochemical energy applications, and thermally carbonized zinc-2-methylimidazole (ZIF-8) has shown particularly high performance owing to its microporous structure with a large surface area. However, in the presence of bulky chemical speci...

Capacitive deionization (CDI) that engages porous carbon electrodes constitutes one of the well‐established energy‐efficient desalination methods. However, improvement in desalination performance, including ion removal capacity, ion removal rate, and charge efficiency remains requisite for a wide range of applications. Herein, an ion‐exchange membr...

Peroxodisulfate (PDS, S2O8²⁻) is one of the strong oxidants (E○[S2O8²⁻/HSO4⁻] = 2.12 VNHE), which is widely used for radical polymerization or wastewater treatment. In electrochemical PDS generation, its efficiency highly depends on the •OH generating electrode materials. A boron-doped diamond (BDD) electrode used in electrochemical PDS generation...

Capacitive deionization (CDI) is considered an alternative desalination technology due to its easy operation, high energy efficiency and environmentally friendly process. However, a separate regeneration step is required in typical CDI technologies that releases the absorbed ions on the electrodes which results in an inefficient and cost-intensive...

Blue TiO2 nanotube array (blue TNA) has gained interest as a highly effective and low-cost material in electrochemical chlorine generation. Hydroxyl radicals mediated chlorine generation is the major pathway (indirect pathway) on the blue TNA which showed lower efficiency than direct pathway on dimensionally stable anodes. In this study, RuO2 coate...

Development of a selective adsorbent with an enhanced removal efficiency for phosphate from wastewater is urgently needed. Here, a hybrid adsorbent of nanoscale zirconium molybdate embedded in a macroporous anion exchange resin (ZMAE) is proposed for the selective removal of phosphate. The ZMAE consists of a low agglomeration of zirconium molybdate...

We reported a facile surface modification by the TiO2 sol-gel derived spray coating method to enhance the fouling resistance of a polyamide (PA) reverse osmosis (RO) membrane. TiO2 nanoparticles (TNPs) were prepared by the base catalyzed sol-gel method for a short span of time and deposited onto the commercial PA RO membrane by spraying. The coated...

Here, we report a novel hybrid electrochemical desalination system synchronized with an oxidation process for the first time. As one of breakthrough in electrochemical desalination systems, the oxidation process is demonstrated as a strategy to overcome the drawbacks of electrochemical desalination systems associated with the difficulties of anion...

Potassium hydroxide (KOH) is widely used in various industrial fields, especially KOH used in electronic fields has a high economic value because it requires a high purity of 99% or more. At present, KOH is commercially mass-produced by an electrolysis process of potassium chloride (KCl), and thus, the purity of KOH produced is directly influenced...

Lithium has become one of the most important elements due to the rapid development of mobile devices and electronics lately. There has been a steep increase in the global demand for lithium, and developing an economic supply of lithium is thereby important for battery industries. This study presents a new method for recovering lithium in wastewater...

Capacitive deionization (CDI) using capacitive electrodes is highlighted as an alternative desalination technology because of its advantages of low cost and high energy-efficiency. However, the deionization capacity of CDI is somewhat limited because its capacity relies on the double layer capacitance of a carbon electrode. Thus, improving the deio...

Recently, nano zero-valent iron (nZVI) has emerged as an effective adsorbent for the removal of arsenic from aqueous solutions. However, its use in various applications has suffered from reactivity loss resulting in a decreased efficiency. Thus, the aim of this study was to develop an effective arsenic adsorbent as a core/shell structural nZVI/mang...

A dimensionally stable anode based on the RuO2 electrocatalyst is an important electrode for generating chlorine. The RuO2 is well-known as an electrode material with high electrocatalytic performance and stability. In this study, sonoelectrodeposition is proposed to synthesize the RuO2 electrodes. The electrode obtained by this novel process shows...

RuO2 is a common active component of Dimensionally Stable Anodes (DSAs) for chlorine evolution that can be used in wastewater treatment systems. The recent improvement of chlorine evolution using nanostructures of RuO2 electrodes to increase the treatment efficiency and reduce the energy consumption of this process has received much attention. In t...

Securing lithium resources is an emerging issue due to the widespread use of lithium-ion batteries. Recently, an electrochemical lithium recovery method based on the principle of a lithium-ion battery using a lithium-capturing electrode and silver as a negative electrode was proposed to meet the increased demand for lithium. However, the high cost...

Electrochemical selective ion separation via capacitive deionization, for example, separation of lithium resource from brine, using lithium ion batteries is proposed and demonstrated to have the potential for separating specific ions selectively from a solution containing diverse ions. This separation method is of great industrial concern because o...

Carbon nanotube (CNT)-polyamide (PA) thin-film nanocomposite (TFN) reverse osmosis (RO) membranes have been highlighted due to their high water permeability. We evaluated the surface properties, membrane performance and fouling behavior of CNT-PA TFN RO membranes. The CNT-PA TFN RO membranes showed ∼30% enhanced water flux, which resulted in a lowe...

Polydopamine (PDA) is widely used to modify the membrane surface to increase the hydrophilicity with the goal of producing a low fouling membrane. However, current methods of PDA modification require alkali conditions and relatively long reaction times. Herein, we introduced the use of UV irradiation during the PDA modification of the membrane surf...

In the development of thin-film composite membranes for forward osmosis, the support layer is believed to have a fundamental role, which affects the membrane performance. However, the development of the support layer containing a high surface porosity, straight morphology of pores, and hydrophilic surface has been limited. Here, we report an organi...

In dimensionally stable anodes, RuO2–TiO2 has emerged as one of the fundamental anode materials in terms of practical application because of its high stability and catalytic performance toward chlorine evolution. Nevertheless, high chlorine evolution efficiency is still required for an effective chlorine production process. In this study, high chlo...

RuO2–TiO2 electrode now becomes popular in the chlor-alkali industry because of high electrocatalytic and stability with chlorine and oxygen evolutions. Using alternative green method for preparation of RuO2–TiO2 electrode is necessary to reduce the cost, time, increase the electrocatalyst performance, stability, and environmental compatibility. In...

The demand for fresh water has been increasing, caused by the growing population and industrialization throughout the world. In this study, we report a capacitive-based desalination system using Prussian blue materials in a rocking chair desalination battery, which is composed of sodium nickel hexacyanoferrate (NaNiHCF) and sodium iron HCF (NaFeHCF...

Vertically aligned TiO2 nanotube arrays (TNTs) were prepared by electrochemical anodization, and then cathodically polarized with dark blue coloration for the dual-functional photoelectrochemical water treatment of organic substrates degradation and accompanying H2 generation. The resulting Blue-TNTs (inner diameter: ~40 nm; length: ~9 μm) showed n...

Salinity gradient energy (SGE) is a renewable energy source available wherever two solutions with different salinity mixes. Capacitive-mixing (Capmix) is a technology that directly extracts the salinity gradient potential through the movements of ions in high and low concentration solutions. However, the energy harvesting performance of Capmix need...

Lead dioxide (PbO_2) is an electrode material that is effective for organic pollutant degradation based on hydroxyl radical (^{\bullet}OH) attack. Representative parameters for PbO_2 electrodeposition are summarized to current, temperature, reaction time, concentration of Pb(II) and electrolyte agent. In this study, Ti/PbO_2 electrodes were fabrica...