A5057049999- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Advanced battery technologies research
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Catalytic Processes in Materials Science
- Advanced Memory and Neural Computing
- Membrane-based Ion Separation Techniques
- Advanced Battery Technologies Research
- Electrochemical Analysis and Applications
- Analytical Chemistry and Sensors
- CO2 Reduction Techniques and Catalysts
- Nanomaterials for catalytic reactions
University of Tartu
2021-2024
Central Electrochemical Research Institute
2015-2024
Academy of Scientific and Innovative Research
2017-2024
Council of Scientific and Industrial Research
2022
Abstract Fuel cells have emerged as a promising clean electrochemical energy technology with great potential in various sectors, including transportation and power generation. However, the high cost scarcity of noble metals currently used to synthesise electrocatalysts for low‐temperature fuel has hindered their widespread commercialisation. In recent decades, development non‐precious metal cathodic oxygen reduction reaction (ORR) gained significant attention. Among those, atomically...
Sulfonic acid functionalized graphene (S-graphene) is explored as a potential inorganic filler well solid proton conducting medium to realize hybrid membrane with Nafion for direct methanol fuel cell (DMFC). The simple, but effective, functionalization of performed by sulfonic containing aryl radicals increase the number sulfonate groups per unit volume domain. Nafion–S-graphene membranes compactness ionic domains and enhanced conductivity while restricting crossover across membrane. DMFCs...
Single-atom catalysts (SACs) open up new possibilities for advanced technologies. However, a major complication in preparing high-density single-atom sites is the aggregation of single atoms into clusters. This stems from delicate balance between diffusion and stabilization metal during pyrolysis. Here, we present pressure-controlled as concept fabricating ultra-high-density SACs. Reducing pressure inhibits substantially, resulting almost three times higher loadings than those obtained at...
Porous carbon derived from silk cotton and heteroatom engineering is explored in this study for developing metal-free electrocatalysts oxygen reduction (ORR). Individual dual doping of N F heteroatoms was conducted to regulate defects the pore geometry porous matrix. Microscopic analysis N–F co-doped (N–F/CTC) undergoes morphological amendments its textural properties responsible creating active sites ORR. N–F/CTC catalyst exhibits excellent ORR catalytic activity methanol CO tolerance...
The present study designates the heteroatom (N,F)-doped various graphitic carbon nanofibers (GNFs) viz. GNF-linear segmented platelets, antlers, herringbone type, and their structural deformations from pristine fiber with many open-edge active centers as metal-free, cost-effective electrocatalysts for oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells (PEMFCs). Introduction of heteroatoms to GNF frameworks enlarges lattice spacing between graphene platelets leads...
This study investigates the oxygen reduction reaction activity of transition-metal-doped ZIF-8 and carbon-nanotube-based composite catalysts in alkaline media their performance anion-exchange membrane fuel cells using an Aemion+® 15 μm AEM.
Toward development of alternative metal-free oxygen reduction reaction catalyst, engineering heteroatoms and tuning defects, pore geometry in porous carbon is explored this study. Simultaneous co-doping nitrogen fluorine to matrix derived from spent coffee grounds synthesized studied for their structural electrochemical properties. Microscopic analysis N-F co-doped (N-F/CC) undergoes morphological evolution its textural properties includes geometrical surface area, structure defects...
Defect chemistry, increasing charge, and spin density in the carbon lattice are keys to advancement of any alternative non-precious cathodic oxygen reduction electrocatalyst for broad dissemination polymer electrolyte fuel cells (PEFCs). In view this prospective, we developed porous from a biomass-derived source, such as corncob (CC) waste, heteroatom N F doping on it increase functionalities defects. Fe was further incorporated N–F/CC-C enhance reaction (ORR) activity power PEFCs. Finely...
Abstract 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 N P. The P to carbon (N−P/CC) brings maximum defect sites in catalyst which are favourable ORR relation individual doped catalyst. Microscopic analysis confirms that N−P co‐doped undergoes slight structural changes by altering its porosity as well surface area. Electrochemical studies confirm...
An unprecedented molten salt synthesis approach was used to produce strontium manganese perovskites (ABO 3 ) and B-site substituted variants (SrMn 1− x Fe O ), which were effectively applied as electrocatalysts in zinc–air batteries.
In the process of developing non-metallic electro-catalyst for oxygen reduction reaction (ORR), simultaneous co-doping N and F into Multiwalled carbon nanotubes (MWCNTs) are synthesized their structural electrochemical properties investigated. Microscopic analysis confirms that N-F/MWCNTs undergo transformation to wrinkled graphene like structures with many open-edge active sites favorable ORR. The enhanced catalytic activity dominant 4 electron transfer during ORR is evidenced N-F/MWCNT...
In an attempt to develop nonprecious metal electrocatalyst, herein, we report borylation of graphitic carbon nanofiber (GNF) and codoping Co, Ni toward a oxygen reduction reaction (ORR) catalyst their application in anion exchange membrane fuel cells (AEMFCs). Boron (B) doping matrix creates C–B bond with lower energy facilitate insertion atoms the beneficial for ORR activity. Co individually combination B/GNF increases positive charge clouds surrounding centers facilitates O2 adsorption...