A5055068849- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Advanced battery technologies research
- Catalytic Processes in Materials Science
- Advanced Photocatalysis Techniques
- Chromium effects and bioremediation
- Pigment Synthesis and Properties
- MXene and MAX Phase Materials
- Supercapacitor Materials and Fabrication
- Electrochemical Analysis and Applications
- Advanced Memory and Neural Computing
- CO2 Reduction Techniques and Catalysts
- Hydrogen Storage and Materials
- nanoparticles nucleation surface interactions
- Machine Learning and ELM
Kyungpook National University
2017-2025
Materials Research Center
2021
University of Dhaka
2015-2016
Bangladesh Council of Scientific and Industrial Research
2015
Pt-based nanoframe catalysts have been explored extensively due to their superior activity toward the oxygen reduction reaction (ORR). Herein, we report synthesis of Pt–Ni multiframes, which exhibit unique structure tightly fused multiple nanoframes and reinforced by an embedded dendrite. Rapid deposition Ni atoms on nanodendrites induce alloying/dealloying Pt in overall nanostructures. After chemical etching Ni, newly formed dendrite-embedded multiframes show electrochemically active...
Pt-based alloy nanoframes have shown great potential as electrocatalysts toward the oxygen reduction reaction (ORR) in fuel cells. However, intrinsically infirm could be severely deformed during extended electro-cyclings, which eventually leads to loss of initial catalytic activity. Therefore, structurally robust nanoframe is a worthy synthetic target. Furthermore, ternary phase offer more opportunities optimizing stability and activity than binary ones. Herein, we report PtCuNi nanoframe,...
A layered β-NiOOH crystal with undercoordinated facets is an active and economically viable nonnoble catalyst for the oxygen evolution reaction (OER) in alkaline electrolytes. However, it extremely difficult to enclose because of its inevitable transformation γ-NiOOH, resulting exfoliation catalytic surfaces. Herein, we demonstrate {111}-faceted Ni octahedra as parent substrates whose surfaces are easily transformed catalytically during OER. Electron microscopic measurements that...
Grain boundaries (GBs) are defects in crystal structures, which general known to be highly active toward various electrocatalytic reactions. Herein, we identify the adverse behaviors of GBs for bimetallic platinum–cobalt (Pt–Co) nanocatalysts oxygen reduction reaction (ORR). As model catalysts, GB-rich Pt–Co nanowires (Pt–Co GB-NWs) and single-crystalline SC-NWs) synthesized. They have very similar diameters, Pt-to-Co ratios, Pt-rich surface except GB populations, can precisely controlled by...
Abstract The 1T phase of MoS 2 exhibits much higher electrocatalytic activity and better stability than the 2H phase. However, harsh conditions synthesis remain a significant challenge for various extensions applications . In this work, simple hydrothermal‐based method transition is being developed. For this, NH ‐MIL‐125(Ti) (Ti MOF) successfully utilized to induce from 1T, achieving high conversion ratio ≈78.3%. optimum phase‐induced /Ti MOF heterostructure demonstrates enhanced oxygen...
Ultrathin two-dimensional (2D) metal nanosheets have attracted significant attention in the field of electrocatalysis. Herein, we present a rational synthetic approach mediated by sequential kinetic–thermodynamic reduction control for holey ultrathin Pt3M alloy (Pt3M HU-NSs, where M = Ni, Co, Cu, Ir, Pd, Ru, Rh, Fe, or Mn) with thickness approximately 3 nm and abundant edge sites. The unique provides fine-tuning over anisotropic 2D growth Pt-based nanostructures restraining three-dimensional...
Abstract The state-of-the-art anion-exchange membrane water electrolyzers (AEMWEs) require highly stable electrodes for prolonged operation. stability of the electrode is closely linked to effective evacuation H 2 or O gas generated from surface during electrolysis. In this study, we prepared a super-hydrophilic by depositing porous nickel–iron nanoparticles on annealed TiO nanotubes (NiFe/ATNT) rapid outgassing such nonpolar gases. NiFe/ATNT exhibited an overpotential 235 mV at 10 mA cm −2...
Abstract Dissolution of Ir oxides in Ir‐based catalysts, which is closely linked to the catalyst activity and stability toward oxygen evolution reaction (OER) acidic media, a critical unresolved problem commercialization water electrolysis. Doping foreign elements into can accomplish an optimal combination oxidation states that conducive leaching‐resistance active catalytic sites. Here, it reported Pt doping IrO x ‐based nanoframe beneficial both terms stability. The Pt‐doped achieves mass...
The synthesis of shape-, facet-, and composition-controlled Pd-based nanocrystals the study their catalytic reaction mechanisms are significant to challenging for development advanced catalysts applicable direct liquid-fuel cells (DLFCs). In present study, we prepared (100)-faceted β-PdH cubes (111)-faceted octahedra, which offered opportunity investigate link between performance shape/facet/composition nanocrystals. octahedra remarkably boosted activity stability formic acid/methanol...
Abstract The long‐term stability of Ni‐based catalysts, employed in the anode anion exchange membrane water electrolyzers (AEMWE), has been a persisting concern. In this work, through simple and powerful electrochemical anodization process, vertically aligned β‐NiOOH atomic sheets (vertical‐β‐NiOOH) grown on Fe‐doped Ni nanoplates (FeNi nanoplates) as solution are offered. This innovative electrocatalyst demonstrates sustained constant current density for over 120 d during oxygen evolution...
Abstract The effect of catalytic surface defects in the oxygen reduction reaction (ORR) has been extensively studied to enhance performance proton‐exchange‐membrane fuel cells. Platinum (Pt)‐based nanocatalysts have used overcome poor ORR, and Sabatier‐type activity plots identify optimal adsorption properties for ORR intermediates on surface. Grain boundaries (GBs) within nanostructures identified as active sites due their reasonable coordination number high residence time. However,...
Rational design of electrocatalysts, including an increased catalytic surface area, a unique structure, and improved conductivity, for facilitating the hydrogen evolution reaction (HER) is emerging as important issue. In this work, we consider engineering catalyst surfaces effective feasible way to accelerate HER kinetics. By etching Fe FeRu alloy nanoparticles (NPs) using hydrofluoric acid (HF), distorted NPs was formed. The HF-treated successfully analyzed by X-ray absorption spectroscopy,...
Oxygen reduction reaction (ORR) performances of palladium nanocubes and octahedra their hydride forms were investigated. A volcano type relationship between ORR activity binding strength intermediates was observed that being the most active toward in acidic media among other Pd-based catalysts. Appendix S1: Supporting information Please note: The publisher is not responsible for content or functionality any supporting supplied by authors. Any queries (other than missing content) should be...
Abstract Doping the PtNi octahedra with trace amount of transition metals has recently been shown to significantly improve activity and durability oxygen reduction reaction (ORR). However, role excessive amounts doped elements on ORR performance is unclear. In this work, were synthesized without excess Mo dopant. Also, spherical nanoparticles containing Co dopant synthesized. The revealed that PtNiMo PtNiCo showed inferior activities compared bimetallic octahedra. Based electrochemical...
Abstract Platinum (Pt) nanocatalysts, doped or alloyed with lanthanum (La), are promising candidates to promote the sluggish oxygen reduction reaction (ORR) kinetics. However, owing very low standard potential of La 3+ (−2.38 V), most synthetic routes reduce costly and complex. Therefore, preparation highly active bimetallic PtLa nanocatalysts by simple low‐cost synthesis methods is a challenging task. This work offers feasible procedure for doping Pt nanocrystals in solvothermal method....
The balance of Ir oxidation states between 3+ and 4+ is crucial to the stability oxide-based oxygen evolution reaction (OER) catalysts. In article number 2003935, ll Choi, Kwangyeol Lee, co-workers directly link Pt doping level mode oxide cover depicts Pt-doped IrOx-based nanoframe as a stable OER catalyst under acidic conditions, which produces green hydrogen via electrolytic water splitting.
The layered transition metal oxyhydroxides have received increasing interest owing to the efficient energy conversion performance and material stability during oxygen evolution reaction (OER). In particular, Fe-doped Ni (NiOOH) shown record-high OER in alkaline media among various catalysts. Theoretically, under-coordinated facets including Ni4+, exposed at edges of NiOOH, were predicted perform highly active OER. Therefore, here we suggest a rational catalyst design that exposes NiOOH with...