Ferry Iskandar

• Dr. Eng.
• Professor at Bandung Institute of Technology

This study investigated the recovery of nickel and other valuable metals from spent batteries, utilizing environmentally friendly hydrometallurgical techniques, i.e., organic acid leaching and oxalic acid co-precipitation, to recover the metal ions. The recovered metal ions in the form of oxalate precipitate served as a precursor for synthesizing n...

Nickel‐rich cobalt‐free LiNi0.9Mn0.05Al0.05O2 (NMA955) is considered a promising cathode material to address the scarcity and soaring cost of cobalt. Particle size and elemental composition significantly impact the electrochemical performance of NMA955 cathodes. However, differences in precipitation rates among metal ions coveys a challenge in obta...

High‐voltage spinel LiNi0.5Mn1.5O4 (LNMO) has been highlighted as one of the most promising cathode materials for next‐generation Li‐ion batteries. However, its performance is known to have shortcomings, i. e., voltage hysteresis induced by the increasing impedance of LNMO during electrochemical cycling at high voltage operation. This paper demonst...

Natuna's natural gas reserve, which contains 70%–v CO2 and 30%–v CH4, opens a prospective method for producing syngas through the dry reforming of methane (DRM). This study used the equation and determination of kinetic parameters in a fixed-bed reactor to develop the operating conditions for the DRM process. The catalyst used was 10%Ni/CeZrO2 and...

An integrated electrochemical exfoliation and electrophoretic deposition (EPD) method is developed to achieve a high‐performance graphene supercapacitor. The electrochemical delamination of graphite sheet has obtained a low‐defected few‐layer graphene adorned with oxygen‐containing functional groups. Then, the EPD process produced a binder‐free ele...

In recent years, graphene has displayed tremendous potential as a material for transparent conductive film (TCF), yet its practical application has been hindered by the danger and toxicity involved within graphene’s large-scale chemical synthesis process. In this work, we reported the fabrication of reduced graphene oxide (rGO)-based TCF using L-as...

Since the emergence of SARS-CoV-2 in 2020, the world has faced a global pandemic, emphasizing the urgent need for effective treatments to combat COVID-19. This study explores the use of green-synthesized carbon-based nanomaterials as potential inhibitors of ACE2, a critical receptor for SARS-CoV-2 entry into host cells. Specifically, the study exam...

Lithium-ion diffusion in solid polymer electrolytes (SPEs) is a pivotal characteristic that significantly influences overall lithium-ion battery performance. This characteristic can be affected by the coordination environment of lithium ions within the polymer matrix. However, the correlation between lithium-ion diffusion and its coordination envir...

Bituminous grade coal is a promising and cost-effective raw material for supercapacitor electrode application. Carbonization plays a crucial role in transforming the organic components present in raw coal into a carbon-rich structure with an enhanced capacity for charge storage. In this research, we study carbonized bituminous coal (CBC) as a preli...

Transition metal sulfide has become infamous in high-energy-density supercapacitor materials due to its rich redox and high conductivity. While its development has achieved a breakthrough in terms of capacitance, there...

Background Since effective antiviral drugs for COVID-19 are still limited in number, the exploration of compounds that have antiviral activity against SARS-CoV-2 is in high demand. Porphyrin is potentially developed as a COVID-19 antiviral drug. However, its low solubility in water restricts its clinical application. Reconstruction of porphyrin int...

Even entering the third year of the COVID-19 pandemic, only a small number of COVID-19 antiviral drugs are approved. Curcumin has previously shown antiviral activity against SARS-CoV-2 nucleocapsid, but its poor bioavailability limits its clinical uses. Utilizing nanotechnology structures, curcumin-derived carbon-dots (cur-CDs) were synthesized to...

Semiconducting colloidal quantum dots (CQDs) represent an emerging class of thermoelectric materials for use in a wide range of future applications. CQDs combine solution processability at low temperatures with the potential for upscalable manufacturing via printing techniques. Moreover, due to their low dimensionality, CQDs exhibit quantum confine...

Zn-air batteries (ZABs) with neutral electrolytes offer a significantly longer lifespan and better recyclability than alkaline ones. However, low-performance bifunctional catalytic activities for oxygen reduction or evolution reaction (i.e., ORR/OER) in neutral electrolytes still hamper their development. Here, we report iron nanoparticle-decorated...

Iron disulfide or pyrite (FeS2) has emerged as a promising transition metal sulfide-based supercapacitor owing to its abundance and superb electrochemical properties. However, FeS2 still faces major hurdles in realizing its full potential, such as a low energy density and poor conductivity. In this study, we report a high-performance FeS2 supercapa...

Regardless of the superiorities of Li1.3Al0.3Ti1.7(PO4)3 (LATP), such as stability against oxygen and moisture, high ionic conductivity, and low activation energy, its practical application in all-solid-state lithium metal batteries is still impeded by the formation of ionic-resistance interphase layers. Upon contact with Li metal, electron migrati...

The alteration of ACE2 expression level, which has been studied in many diseases, makes the topic of ACE2 inducer potential crucial to be explored. The ACE2 inducer could further be designed to control the ACE2 expression level, which is appropriate to a specific case. An in vitro study of well-characterized carbon dots (CDs), made from citric acid...

As a new family in carbon nanomaterials, carbon dots (CDs) are potential candidates for solar water evaporator, owing to their cost-effectiveness, non-toxicity, high solubility, and tunable optical properties. Despite such potentials, however, CDs mainly absorb solar spectrum in the ultraviolet region while their absorption in the visible region is...

Supercapacitor gains so much interest in recent years due to its capabilities to provide high power densities with high energy density possibilities. Several transition metal sulfides (TMS) give the best capacitance results nowadays, with Copper Sulfides (CuS) promising candidates on supercapacitor electrodes materials. Several approaches have been...

Perovskite solar cells (PSCs) have become more popular among third-generation photovoltaic technologies. Owing to their unique optical and electrical properties, PSCs can achieve high efficiency compared to traditional silicon solar...

Trifunctional ORR/OER/HER catalysts are emerging for various sustainable energy storage and conversion technologies. For this function, employing 1D structures leads to a limited surface area and structural robustness. Instead of...

Li1.2Ni0.13Co0.13Mn0.54O2 (LNCM) has been intensively investigated owing to its high capacity and large voltage window. However, despite its high performance, the synthesis of LNCM can be challenging as it usually contains structural disorders and particle-size inhomogeneities, especially via a solid-state method. This work introduces microwave irr...

Graphene has been gaining tremendous attention as an active material for energy storage devices owing to its large surface area, high electrical conductivity, and high electrochemical stability. However, the restacking of graphene layers during the synthesis process has become one issue that can reduce electrode performance. In this work, the struc...

Li1.2Ni0.13Co0.13Mn0.54O2 is a type of Li-rich cathode material that has a high specific capacity and wide voltage window. However, continuous capacity fading and voltage decay significantly retard its practical and commercial applications. In this work, we investigate the degradation mechanism of Li1.2Ni0.13Co0.13Mn0.54O2 cathode by the electroche...

Li-ion batteries (LIBs) have been widely used in almost every aspect of human life. Not only for portable electronics but also envisioned to be used as energy storage of most vehicles in the future. However, as their usage increases, the environmental problem caused by the piling up of the battery waste cannot be avoided. Recycling is considered th...

Despite its high theoretical capacity, silicon anode has limited intrinsic conductivity and experiences significant volume changes during charge‐discharge. To overcome these issues, facile metal‐assisted chemical etching and in‐situ polymerization of aniline are employed to produce a dense 1D polyaniline/silicon nanowire forest without noticeable a...

Carbon-based luminescent nanomaterials (CLNMs) have been progressively developed and exhibit excellent performance in broad applications. However, the unclear formation mechanism and obtained complex structure of CLNMs, induced a lack of deep understanding of the synthesis-structure-properties-performance relationship, hindering further development...

Nitrogen and oxygen-based functionalized Carbon dots' (CDs) surfaces have attracted significant attention owing to their ability to tailor CDs' optical and electronic properties. However, the complex synthesis process and structure of the functionalized CDs hindered an in-depth understanding of their mechanism, limiting their potential applications...

Controlled C–N configurations, i.e., pyrrolic-N, pyridinic-N, and graphitic-N, are promising strategies to tailor the carbon dots’ (CDs) optical properties into the first near infrared (NIR) window (650–900 nm), a responsive range for biomedical application. However, a deep understanding of the role of the C–N configuration in the CDs’ properties i...

The demand for high-capacity lithium-ion batteries (LIBs) is ever-increasing. Thus, research has been focused on developing silicon-based anodes due to their high theoretical capacity and natural abundance. However, silicon-based anodes still suffer from several drawbacks (e.g., a huge volume expansion during lithiation/delithiation and the low con...

The development of energy storage devices providing high energy and power densities and long-term stability will play an important role in the future utilization of sustainable energy sources. Numerous efforts have been devoted to achieving these requirements, especially the design of advanced electrode materials. For this reason, there is growing...

The specific capacitance and charge transfer properties of electrochemically exfoliated graphene (EG) are studied using various alkaline electrolytes. Scanning Electron Microscopy (SEM) and Raman spectroscopy results confirm the successful exfoliation of graphite into EG using electrochemical treatment. At similar concentrations, the prepared EG el...

Lithium aluminium titanium phosphate, Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP), is a highly potential material for solid electrolyte (SE) in an all-solid-state battery (ASSB) thanks to its superior ionic conductivity. The crystallinity of the material plays an important role in determining the ionic conductivity, ensuring the excellent performance of...

Carbon dots (CDs) have attracted considerable interest due to their remarkable performance, low cost and ease of preparation, and wide range of potential applications. Surface engineering, including modifying the surface functional group and subsequent chemical modification, is preferable to achieve the requirement of the specific application. Oxyg...

Dry reforming of methane was studied over high-ratio zirconia in ceria-zirconia-mixed oxide-supported Ni catalysts. The catalyst was synthesized using co-precipitation and impregnation methods. The effects of the catalyst support and Ni composition on the physicochemical characteristics and performance of the catalysts were investigated. Characteri...

Organometal halide perovskites have been gaining tremendous attention for their potential application as optoelectronic devices, owing to their excellent optical and electronic properties. This work fabricated MAPbBr3/PMMA composite film with bright green emission via a simple drop-casting method. It is found that when MAPbBr3 were combined with PM...

LiNi1/3Co1/3Mn1/3O2 (NCM 111) cathode material was reproduced from end-of-life LIBs via a green hydrometallurgical process including environmentally friendly DL-malic acid leaching, oxalate co-precipitation, and heat treatment. The leaching reached efficiency 95% by using glucose as reducing agent. X-ray fluorescence analysis revealed effective oxa...

Recycling waste polymer into a high-value product is a challenge the community faces. Therefore, we presented an approach to transform expanded polystyrene (EPS) into a high-value product of air filter media using multi-input nozzleless electrospinning. An optimum combination of large and small fiber diameter could produce an air filter with a filt...

Carbon nanodots (CNDs) are considered as potential materials for photothermal applications and can be used as solar absorbers to enhance the absorption and conversion efficiency of solar energy to heat. To meet the criteria as solar absorbers, CNDs were synthesized via microwave heating and dried by two different drying processes, namely freeze dry...

Correction for ‘Solid-state nitrogen-doped carbon nanoparticles with tunable emission prepared by a microwave-assisted method’ by Fitri Aulia Permatasari et al. , RSC Adv. , 2021, 11 , 39917–39923, DOI: 10.1039/D1RA07290K.

Li-rich NMC with a chemical formula of Li1.2Ni0.13Co0.13Mn0.54O2, a type of Li-rich cathode materials built of layered-layered structure, have been gaining interest due to its high specific capacity. However, they suffer from low Coulombic efficiency, poor cycling stability, and poor rate capability. In this work, we have successfully prepared the...

1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI-TFSI) is one type of ionic-liquids (ILs) that attracts much attention for its application as lithium-ion battery electrolyte due to its large diffusion coefficient, wide temperature range of...

Tunable emissive solid-state carbon nanoparticles (CNPs) have been successfully synthesized by a facile synthesis through microwave irradiation. Modulating microwave interaction with the sample to generate abrupt localized heating is a long-term challenge to tailor the photoluminescence properties of CNPs. This study systematically revealed that th...

Carbon Dots (CDs) that exhibited a First Near Infra-red (NIR) Window absorption was designed by a combination of Nitrogen and Oxygen surface functional groups. The Time-Dependent Density Functional Theory (TD-DFT) calculation is initially used to investigate the appropriate combination of N and O surface functional groups that effectively generate...

Due to its high theoretical specific capacity, a silicon anode is one of the candidates for realizing high energy density lithium-ion batteries (LIBs). However, problems related to bulk silicon (e.g., low intrinsic conductivity and massive volume expansion) limit the performance of silicon anodes. In this work, to improve the performance of silicon...

Zero-dimensional Perovskite Magic-size Clusters play crucial roles in understanding and controlling nucleation and growth of semiconductor nanoparticles. However, their metastability behavior is a critical hindrance for reliable characterizations. Here, we report the first demonstration of using an excess amount of surface ligand and SiO 2 as novel...

Production of high-aspect-ratio silicon (Si) nanowire-based anode for lithium ion batteries is challenging particularly in terms of controlling wire property and geometry to improve the battery performance. This report demonstrates tunable optimization of inductively coupled plasma reactive ion etching (ICP-RIE) at cryogenic temperature to fabricat...

With a remarkable theoretical specific capacity of ∼4200 mA h g⁻¹, silicon anodes are at the forefront of enabling lithium-ion batteries (LIBs) with ultra-high energy density. However, we have yet to see the wide utilization of silicon anodes in commercial LIBs due to several challenges, categorized as intrinsic and extrinsic problems. The intrinsi...

Polyelectrolyte complexes (PECs) are attractive materials for drug delivery application as they offer simple preparations and high drug-loading efficiency. In this study, a novel method for preparing polyelectrolyte complex nanoparticles using a simple mixing method of chitosan and poly-2-acrylamido-2-methylpropane sulfonic acid (PAMPS) solutions i...

This paper reports the synthesis and characterization of a composite thin of waste-derived acrylic plastic (PMMA) and MAPbBr 3 perovskite nanocrystal that prepared by ligand assisted re-precipitation (LARP) method. The composite thin film prepared from MABr, PbBr2, oleic acid and oleyl amine, N, N-dimethylformamide (DMF) as a precursor, toluene as...

Hollow carbon spheres (HCSs) have attracted tremendous interest in recent years due to their intriguing structure-induced physicochemical properties and significant potential for numerous applications. However, the preparation of HCSs with precise structural control using a simple and scalable strategy remains challenging. In this work, hollow carb...

Solar evaporation using photothermal materials is an environmentally friendly and feasible solution to overcome the water scarcity issue by utilizing the abundant solar energy source. Some key points for efficient solar-to-thermal energy conversion have been extensively studied. Among them, the advancement of solar absorber materials has emerged as...

The effect of pre-treating graphite sheets in a H2SO4/H2O2 solution before electro-exfoliation is reported. It was revealed that the volume fraction of H2SO4 to H2O2 during pre-treatment could control the degree of exfoliation of the resulting exfoliated graphite (EG). X-ray diffraction (XRD), Raman, and Fourier transform infrared (FTIR) spectrosco...

In this study, the electrical properties of exfoliated graphite (EG) with copper addition is reported. Firstly, EG samples were synthesized using electrochemical exfoliation of the pre-treated graphite sheet then combined with various copper concentrations. X-Ray Diffraction (XRD) characterization indicated that the composites of EG, Cu, and Cu2O w...

The effect of silica (SiO2) addition on optical properties of organometal halide perovskite PMMA composite film was studied. The organometal halide perovskite, MAPbBr3, was synthesis using ligand assisted re-precipitation (LARP) method, and then was compose to PMMA and SiO2 directly to make composite films. The absorbances, transmittances, and phot...

Graphene has been gaining immense attention from scientists over the world for its exceptional properties, which makes it promising for several applications such as energy storage, electronic devices, and biomedicine. Graphene synthesis via the electrochemical exfoliation route offers a cheap, simple, eco-friendly, and scalable process for industri...

Background Curcumin is a well-documented bioactive compound present in Curcuma sp., a tropical medicinal plant. This substance exhibits broad spectrum biological activities including antivirus. Despite, the lack of pharmaceutical properties of curcumin limits its clinical use. Objective This study aims to produce curcumin nanoemulsion with differe...

In this article, we employ a numerical calculation to determine the Pm2O3-Si p-n junction betavoltaic electrical performance using Finite Difference Minority Carrier Diffusion Equation (FD-MCDE) method. In order to verify the method, the comparation result is presented according to the basic planar design in the experimental study as well as the an...

Valuable metals from spent LIBs can be recovered through acid leaching and co-precipitation process. In this study, citric acid was used as a leaching agent to extract Li, Co, Ni, and Mn ions from LiNi1/3Co1/3Mn1/3O2 (NCM 111) active material by adding sucrose as a reducing agent. Addition of sucrose was able to increase the efficiency of metal ion...

In this study, we added polyvinyl alcohol (PVA) as a composite polymer to PEO based SPEs, with a varied amount of LiOH addition. The homogeneous solution was cast to form a thin and transparent SPE membrane. Characterization by X-ray Diffraction (XRD) revealed the semi-crystalline properties of all samples. Ionic conductivity of SPEs composites was...

Organic-inorganic CH3NH3PbBr3 perovskite nanoparticle has emerged as highly promising semiconductor materials for photovoltaic and optoelectronic applications such as solar cells, light-emitting diodes (LEDs), and other luminescent devices because of their optical properties and electrical conductivity. The optical properties of perovskite can be m...

We report a rapid growth of the CH 3 NH 3 PbCl 3 single crystal through microwave irradiation. A systematic evaluation of the structural and optical properties of the obtained single crystal was also conducted. 1 minute is the optimum microwave irradiation time that generated a large single crystal of dimension (5 Â 5 Â 2.5) mm 3. The obtained crys...

Carbon-based Quantum dots (C-QDs) are carbon-based materials that experience the quantum confinement effect, which results in superior optoelectronic properties. In recent years, C-QDs have attracted attention significantly and have shown great application potential as a high performance supercapacitor device. C-QDs (either as a bare electrode or c...