Gouse Peera

• Ph.D
• Professor (Assistant) at Keimyung University

Realistic applications of zinc–air batteries are hindered by the high cost of Pt/C cathode catalysts, necessitating the search for alternative, sustainable electrocatalysts. In this work, we developed a sustainable Fe3C/Fe-Nx-C cathode catalyst from waste coffee biomass for an oxygen reduction reaction (ORR) in alkaline electrolytes and zinc–air ba...

With unique 4f electronic shells, rare earth metal-based catalysts have been attracting tremendous attention in electrocatalysis, including oxygen reduction reaction (ORR). In particular, atomically dispersed Ce/CeO2-based catalysts have been explored extensively due to several unique features. This review article provides a comprehensive understan...

This work synthesizes a xerogel from a sol–gel synthesis strategy and supports it on N-doped carbon support from spent coffee biomass (Mn(II)O/N-CC, hereafter MnO) as an efficient oxygen reduction reaction (ORR) catalyst in alkaline electrolytes. The effects of N-CC carbon content on MnO nanoparticle size, dispersion, distribution, morphology, and...

Development of a highly efficient trifunctional electrocatalyst for hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is essential in a variety of energy conversion technologies, such as H2-O2 fuel cell and overall water splitting. However, state-of-the-art electrocatalysts (Pt, Ir, Ru) for these...

Development of hybrid graphitic carbon nitride (GCN) nanocomposite is an emerging research area in wastewater treatment. Herein, hybrid visible light active photocatalyst of silver decorated polymeric graphitic carbon nitride and (Ag-GCN) with cerium oxide (CeO2) nanocomposite was prepared and characterized in detail. The Ag-GCN/CeO2 photocatalyst...

Metal free visible light active photocatalysts of covalent organic polymers (COPs) and polymeric graphitic carbon nitride (g-C3N4) are interesting porous catalysts that have enormous potential for application in organic pollutant degradation. Imine condensation for COPs, and thermal condensation for g-C3N4 were used to produce the catalysts. FT-IR,...

Herein, reduced graphene-oxide-supported ZrO2 and Y2O3 (rGO-ZrO2 and rGO-Y2O3) nanocomposites were synthesized by hydrothermal method and used as the catalysts for photodegradation of picric acid. The structural and morphological properties of the synthesized samples were characterized by using an X-ray diffractometer (XRD), scanning electron micro...

Herein, SnS and Eu-doped SnS QDs have been synthesized by a facile chemical co-precipitation method for efficient photocatalytic degradation of organic dye molecules. The structural, morphological, and optical properties of QDs were investigated by various physiochemical characterization techniques. The photocatalytic degradation of methylene blue...

MXenes, a novel family of 2D transition metal carbide, nitride and carbonitride materials, have been gaining tremendous interest in recent days as potential electrocatalysts for various electrochemical reactions, including hydrogen evolution reaction (HER). MXenes are characterized by their etchable metal layers, excellent structural stability, ver...

Microplastic pollution has been widely studied as a global issue due to increased plastic usage and its effect on human and aquatic life. Microplastics originate from domestic and industrial activities. Wastewater treatment plants (WWTPs) play an important role in removing a significant amount of microplastics; otherwise, they end up in bioaccumula...

Synthesis of non-precious metal catalysts (NPMC) has been gaining significant interest in recent years due to their low cost and excellent oxygen reduction reaction (ORR) activity. However, their successful entry into the real market had been challenged primarily by their ease of synthesis in large quantities, with a reproducible electrocatalytic a...

Morphology of carbon nanofibers significantly effects Pt nanoparticles dispersion and specific interaction with the support, which is an important aspect in the fuel cell performance of the electrocatalysts. This study emphasizes, the defects creation and structural evolution comprised due to N–F co-doping on graphitic carbon nanofibers (GNFs) of d...

Microbial electrolysis cells (MECs) have been explored for various applications, including the removal of industrial pollutants, wastewater treatment chemical synthesis, and biosensing. On the other hand, MEC technology is still in its early stages and faces significant obstacles regarding practical large-scale implementations. MECs are used for en...

Single-atom catalysts (SACs) can maximize the utilization of metal atoms and reduce manufacturing costs, so they have been extensively studied. This study used density functional theory (DFT) calculations to discuss in detail the CO oxidation reaction (COOR) mechanism on non-noble metal iron and nitrogen atoms co-doped graphene. It was determined t...

In the electrocoagulation wastewater treatment process, extremely polluted water treatment requires an effective technique, and using high current is one of those. This study aims to optimize electrocoagulation parameters such as operation time, electrodes gap and the initial pH by applying high current intensity to treat palm oil mill effluent (PO...

Microbial fuel cells (MFCs) are biochemical systems having the benefit of producing green energy through the microbial degradation of organic contaminants in wastewater. The efficiency of MFCs largely depends on the cathode oxygen reduction reaction (ORR). A preferable ORR catalyst must have good oxygen reduction kinetics, high conductivity and dur...

MXenes are novel transition‐metal‐carbide‐ and/or nitride‐based 2D materials that attract considerable attention in the field of energy storage and conversion because of their unique layered structures, electronic properties, and surface chemistries, which facilitate various electrochemical reactions. MXenes have been rarely investigated as probabl...

MXene is a growing class of two-dimensional layered material that has been showed promising application in various energy storage and conversion technologies, due to its unique electrical, mechanical, surface and electrocatalytic properties. One of the promising applications of MXene is, its definite role as durable catalyst support materials, for...

Carbon monoxide oxidation is a famous typical polyphase catalytic reaction, which can convert toxic gases into non-toxic substances, thus reducing environmental pollution. The traditional catalytic reaction has high energy barriers and low energy efficiency, while the single metal atom was inserted into the thin graphene with excellent electronic p...

Double atoms catalysts (DACs) emerged very recently as excellent materials and were used in various catalytic reactions due to their excellent catalytic activity. Although active research on the design DACs has been ongoing for almost a decade, little attention has been paid to the detailed catalytic mechanisms. Based on density functional theory (...

Development of highly efficient, cost effective heteronuclear catalysts has been a huge interest in recent years due to its prime importance in environmental perpetuation. Among the developed catalysts, heteroatom-doped graphene catalysts for CO oxidation have attracted a global attention, due to its unique electronic properties suitable for CO oxi...

Electrochemical water splitting is considered a promising way of producing hydrogen and oxygen for various electrochemical energy devices. An efficient single, bi-functional electrocatalyst that can perform hydrogen evolution reactions (HERs) and oxygen evolution reactions (OERs) is highly essential. In this work, Co@NC core-shell nanoparticles wer...

Electrochemical water splitting is considered a promising way of producing hydrogen and oxygen for various electrochemical energy devices. An efficient single, bi-functional electrocatalyst that can perform hydrogen evolution reactions (HERs) and oxygen evolution reactions (OERs) is highly essential. In this work, Co@NC core-shell nanoparticles wer...

Water is an essential solvent that is extremely necessary for the survival of life. Water pollution due to the increased utilization of water for various processes, including domestic and industrial activities, poses a special threat that contaminates both surface and ground water. In recent years, advanced oxidation processes (AOPs) have been appl...

The bioelectroactive fuel cells (BFC) or bioelectrochemical systems (BES) are regarded as a potent source for producing green and sustainable energy. The two major BFCs studied extensively are the enzymatic fuel cells and the microbial fuel cells. The main difference between them is the bioactive source that catalyzes the electrochemical reaction i...

Wastewater treatment and reduction of metal pollutants are potent applications of bioelectroactive fuel cells (BFC) to reduce waste and reuse otherwise unavailable resources. This method is considered to be much simpler and faster compared with the conventional wastewater treatment in treatment plants which requires a rigorous physical, chemical, a...

Nitrogen-doped Fe-based carbon electrocatalyst (Fe–N–C) is developed by a one-pot pyrolysis method, using a solid-state Fe-EDTA coordination complex. The synthesized catalyst was analytically evaluated by various physical and electrochemical measurements. The effect of various synthetic parameters such as sucrose and EDTA and the effect of metal co...

Development of efficient bifunctional electrocatalysts for reversible oxygen reduction (ORR) and the oxygen evolution reaction (OER) is of prime importance in rechargeable metal–air batteries. In this work, a relatively unexplored and mechanistically unclear nickel-based catalyst has been explored as an ORR and OER catalyst using density functional...

Electrochemical N2 reduction reaction (NRR) has received much attention in recent times. Aiming for, discovering potential electrocatalysts with superior activity, stability and selectivity, a series of 3 d transition metal dimers were studied by density functional theory (DFT) calculations. The investigation reveals that most of the metal dimers h...

Single-atom catalysts (SACs) have been extensively studied due to their highly dispersed atomic levels, which greatly improves the distribution of the active sites and maximum utilization of the catalyst. In this study, Mn based SACs were modeled on N-doped graphene with single and double vacancy defects, 11 types of MnNX models containing various...

Microbial fuel cells, an emerging technology has been paid a great attention in recent years, due to its unique advantages in treating wastewater to portable water, together with the generation of useful electricity, with the help of bio-active anodes and electrochemical cathodes, simultaneously. When applying this technology in a practical scale,...

Currently, single atomic catalysts have been extensively explored as electrocatalysts for the oxygen reduction reaction (ORR) for several important energy conversion technologies. We systematically evaluated the catalytic activities of transition metal (Tm) coordinated with N atoms in graphene (TmNx-gra) towards ORR. A series of metals comprising 3...

Single-atom catalysts (SACs) have been extensively investigated in recent times due to their highly dispersed atomic levels and the improved distribution of their metallic active sites, maximizing the specific activity of the catalyst. Through the calculation of density functional theory (DFT), the oxidation reaction of carbon monoxide (COOR) on Mn...

Toxic gases destroy the ecological environment and endanger human health, which enlightened the researchers in development of new materials and technologies that effectively collect and capture toxic gases, and convert to harmless gases with the aid of catalyst. Density functional theory (DFT) calculations are performed to evaluate the changes in a...

In this study, newly developed high manganese (Mn) and low nickel (Ni) austenitic stainless steels were investigated as an alternative to conventionally used SS 316L for bipolar plate applications in proton exchange membrane fuel cells. Systematic studies on the corrosion behavior were carried out in simulated hydrogen and oxygen environments, for...

Electrocatalysts for oxygen reduction reaction have been the study of interest because of their importance in various energy storage and conversion reactions. Though platinum-based catalysts are found to be the most active catalysts for oxygen reduction reactions, their high cost and scarcity have led researchers to discover alternative active and...

Rational, low cost, stable and more realistic synthesis of electrocatalysts comprising of earth abundant metals alterative to platinum-based catalysts is highly required for fuel cells. In this work, we demonstrate 2D nanosheet catalyst from metal organic frame works with zinc and 2-amino thiazole as organic ligand in presence of cobalt metal ions....

Phosphorus-doped graphene is known to exhibit good electrocatalytic activity for oxygen reduction reaction (ORR). While the ORR activity of P-doped graphene nanoribbons (PGNR) is still unclear. Taking the common graphene nanoribbons with the edges of armchair as an example in this study, we research the mechanistic investigation of ORR on the PGNR...

Both theory and experiment show that sp² carbon nanomaterials doped with N have great potential as high-efficiency catalysts for oxygen reduction reactions (ORR). At present, there are theoretical studies that believe that C-sites with positive charge or high-spin density values have higher adsorption capacity, but there are always some counter exa...

Various experimental investigation had proved that metal dimers possess excellent oxygen reduction reaction (ORR) activity compared to single metal atom catalysts, due to the synergistic effect exerted by two metal atoms. However, it is still unclear how the electrocatalytic activity is enhanced in a fundamental aspect. In this study, we systematic...

Recently, heteroatoms co-doped carbon material catalyst has shown extraordinary oxygen reduction reaction (ORR) catalytic activity, but lack of understanding of the specific mechanism of ORR has hindered its further development. In this study, we studied the geometric structure, stability, electronic properties, catalytic sites and detailed ORR pat...

Surmounting the sluggish oxygen reduction reaction (ORR) kinetics in developing the metal-free cathode catalyst for fuel cell, carbon nanomaterials with heteroatoms doped intended to focus vigorously. Electronegativity difference between heteroatoms is prone to maximize the C-C bond polarization to generate ORR active sites. The current work emphas...

A porous, efficient, and durable nonprecious electrocatalyst for oxygen reduction reaction (ORR) under both alkaline and acidic conditions has been synthesized by a solvent-free, one-pot, economical, and template-free strategy. The in-situ formed graphitic carbon nitride (g-C3N4) was utilized as a sacrificial template for constructing the core-shel...

Pt based catalyst represents the best state-of-the-art electrocatalysts for electrochemical cathodic oxygen reduction reaction of proton exchange membrane fuel cells. Among, Pt based electrochemical catalysts, Pt-transition metal catalysts have been the most successful in terms of activity. However, the poor structural and chemical stability of Pt-...

Manganese oxide-based nitrogen-doped reduced graphene oxide (MnO/N-rGO) electrocatalyst was developed by a simple sol–gel process with aqueous KMnO4 and sucrose by adding nitrogen-doped reduced graphene oxide. The physical characterizations were systematically evaluated by X-ray diffraction, field emission scanning electron microscope, transmission...

Development of highly active and durable catalysts for oxygen reduction reaction (ORR) alternative to Pt-based catalyst is an essential topic of interest in research community but challenging task. Here, we have developed a new type of face-centered tetragonal (fct) PdFe alloy nanoparticles encapsulated Pd (fct-PdFe@Pd) anchored onto nitrogen-doped...

The oxygen reduction reaction is a fundamental reaction in fuel cells to generate power, for which metal/metal-oxide carbon-based catalyst plays an important role. Herein, we report the hydrothermal-microwave synthesis of cobalt oxide incorporated nitrogen-doped graphene (Co3O4/N-rGO) composite and studied its catalytic potential for oxygen reducti...

Herein, a new type of cobalt encapsulated nitrogen‐doped carbon (Co@NC) nanostructure employing ZnxCo1−x(C3H4N2) metal–organic framework (MOF) as precursor is developed, by a simple, ecofriendly, solvent‐free approach that utilizes a mechanochemical coordination self‐assembly strategy. Possible evolution of ZnxCo1−x(C3H4N2) MOF structures and their...

This paper describes the synthesis of low cost electrocatalyst for oxygen reduction reaction (ORR) from spent coffee grounds (SCGs) through heteroatom engineering and simultaneous co-doping of N and P. The co-doping of N and P to coffee carbon (N−P/CC) brings maximum defect sites in the catalyst which are favourable for ORR in relation to the indiv...

We demonstrate the synthesis of N-graphene via efficient hydrothermal-microwave irradiation method for oxygen reduction reaction (ORR). The high energetic uniform heating of microwave irradiation produces highly exfoliated nitrogen-doped graphene layers in shortest time. Notably, the nitrogen content of doped graphene has been evaluated ~6.86 at%....

Layered transition metal sulfides (TMS) are emerging as advanced materials for energy storage and conversion applications. In this work, we report a facile and cost-effective anion exchange technique to fabricate layered, multifaceted free standing ultra-thin ternary cobalt molybdenum sulfide nanosheets (Co-Mo-S NS) architecture grown on 3D porous...

A Novel hybrid of 2D Ni-Mo-S nanosheets intergrated nitrogen doped graphene (NG) are successfully developed via a simple, scalable, and cost-effective hydrothermal process and its application towards energy conversion devices is explored. The presence of exclusive mesoporous structures combined with an excellent conducting NG network in the Ni-Mo-S...

In the process of developing non-metallic electro-catalyst for oxygen reduction reaction (ORR), simultaneous co-doping of N and F into Multiwalled carbon nanotubes (MWCNTs) are synthesized and their structural and electrochemical properties are investigated. Microscopic analysis confirms that N-F/MWCNTs undergo structural transformation to wrinkled...

Development of active, inexpensive and durable non-precious metal electrocatalysts to replace high cost Pt-based catalysts towards commercialization of fuel cell technology is the focus in recent days. In this regard, we report a facile one pot hydrothermal synthesis of self-assembled manganese sulfide on graphene layers (MnS/G) and recognised as n...

Development of an efficient, nonprecious, and durable oxygen reduction catalyst to replace high-cost Pt-based catalysts is one of the critical challenges in polymer electrolyte membrane fuel cells. In the present study, we report a novel chemical method for the simultaneous doping of nitrogen and sulfur by in-situ polymerization of 6-N,N-dibutylami...

A novel and promising non-precious metal catalyst containing cobalt sulfide (Co-S) and graphene is synthesized, and recognized as an efficient and durable electro-catalyst for oxygen reduction reaction (ORR) in alkaline medium. The phase formation and morphologies of Co-S and Co-S/G composites are systematically studied and are correlated with elec...

In the present study, acid–base blend membranes are synthesized to imply as electrolytes in polymer electrolyte membrane fuel cells (PEMFCs). Poly(bis(phenoxy)phosphazene) (POP) is sulfonated with sulfuric acid to impart the ionic conductivity and then blended with sulfonated poly(ether ether ketone) (sPEEK). The blend membranes are fabricated by v...

A promising non-precious metal catalyst containing manganese oxide and N-graphene is synthesized and is recognised as an efficient and durable electrocatalyst for the oxygen reduction reaction (ORR) in an alkaline medium. Hydrothermally synthesized Mn 3 O 4 is incorporated into graphene mixed with melamine as a nitrogen source and annealed at a tem...

Nitrogen and fluorine co-doped graphite nanofibers (N/F-GNF) and their cumulative effect with Fe and Co have been developed as an alternative non-precious metal catalyst for efficient oxygen reduction reaction (ORR) in acidic media. The synergistic effect between the doped hetero atoms and the co-ordinated Fe and Co towards ORR activity and durabil...

Nitrogen and fluorine co-doped graphite nanofibers (NF–GNFs) are explored as highly corrosion-resistant support materials and investigated for their possible interaction with Pt as an efficient oxygen reduction reaction (ORR) catalyst in an acidic medium. The Pt/NF–GNF catalyst exhibits enhanced ORR behavior with greater electrochemical stability,...

Sulfonic acid functionalized graphene (S-graphene) is explored as a potential inorganic filler as well as a solid acid proton conducting medium to realize a hybrid membrane with Nafion for a direct methanol fuel cell (DMFC). The simple, but effective, functionalization of graphene is performed by sulfonic acid containing aryl radicals to increase t...

Dendrimers have shown as a promising candidate in controlling the size, shape and avoid agglomeration of the metal nanoparticles. Platinum nanoparticles are stabilized by fourth generation amine terminated poly(amidoamine) (G4-PAMAM) dendrimers and anchored successively onto carbon by two methods, namely ester functionalization (Pt-DENs/Cest) and a...

Synthesis of mesoporous carbon (MC) with well-defined morphologies and, wide range of surface area and pore size, is reported by organic-organic interaction between thermally decomposable surfactants (structure-directing agents) and the cost-effective carbon precursors, such as phloroglucinol and formaldehyde. Selected surfactants based on tri-bloc...

Anion exchange membrane from poly(phenylene oxide) containing pendant quaternary ammonium groups is fabricated for application in alkaline polymer electrolyte fuel cells (APEFCs). Chloromethylation of poly(phenylene oxide) (PPO) was performed by aryl substitution and then homogeneously quaternized to form an anion exchange membrane (AEM). The influ...

b Nitrogen functionalization of graphite nanofibers (N-GNF) was performed using hexa methyl tetra amine (HMTA) as the nitrogen source and used as a support material for metal nanoparticle deposition. The successful incorporation of nitrogen was confirmed using X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy analysis. Iridium (Ir) nano...

Impact on the ionic channels of sulfonated poly(ether ether ketone) due to the incorporation of polyphosphazene: a case study in direct methanol fuel cells Blend membranes are fabricated from sulfonated poly(ether ether ketone) (SPEEK) and poly[bi-s(phenoxy)phosphazene] (POP). The effect of POP content on the distribution of ionic channels is inves...

Hydroxyl ion (OH–) conducting anion exchange membranes based on modified poly (phenylene oxide) are fabricated for their application in alkaline polymer electrolyte fuel cells (APEFCs). In the present study, chloromethylation of poly(phenylene oxide) (PPO) is performed by aryl substitution rather than benzyl substitution and homogeneously quaterniz...

A more complex class of photo catalytically active material that has received less attention is the poly oxo metalate (POM) [11, 12]. Most POM clusters share the general photochemical characteristics of the semiconductor photo catalysts. POM anions include a large variety of oxygen bridged metal clusters well known for their rich photo catalytic ac...