Construction of Warped Graphitic Layers from Fullerene Soot and Study of Their Catalytic Oxygen Reduction Activity

The Journal of Physical Chemistry C, Journal Year: 2023, Volume and Issue: 127(51), P. 24564 - 24573

Published: Dec. 19, 2023

Platinum is widely used in cathode catalysts for fuel cells; however, it expensive, with limited reserves. Hence, the development of non-Pt has been extensively studied. Carbon alloy are considered most potent alternatives to Pt-based catalysts. However, catalytic activity carbon, which primary constituent carbon catalysts, oxygen reduction reactions (ORRs) insufficiently investigated. In this context, we demonstrate that warped graphitic layers (WGLs) ORR active sites by investigating factors contribute WGL, a metal- and heteroatom-free material. WGLs prepared from fullerene extraction residues, after heat treatment at 1250 °C, they exhibit maximum 0.79 V number electrons involved reaction (n) 3.7. The WGL-HTs determined curvature radius its continuity. affects adsorption state oxygen, as revealed equilibrium constant obtained measurements. continuity also facilitates transport adsorbed work function act sites, π-electron systems transfer oxygen. This study highlights potential materials continuous carbon-based efficient cost-effective polymer electrolyte cell systems.

Language: Английский

A Review on Recent Developments in Transition Metal and Heteroatom‐Doped Carbon Catalysts for Oxygen Reduction Reaction

Electrochemical Science Advances, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 25, 2024

ABSTRACT Oxygen reduction reaction (ORR) is key in many green energy conversion devices like fuel cells and metal‐air batteries. Developing cheap robust electrocatalysts crucial to expedite the slow ORR kinetics at cathode. Lately, transition metal (TM) heteroatom‐doped carbon catalysts have surfaced as promising cathode materials for they display admirable electrocatalytic activity distinguished properties tunable morphology, structure, composition porosity. This review summarizes recent breakthrough TM (Fe, Co, Mn Ni) heteroatoms (N, S, B, P F) doping materials. Moreover, their active sites are inspected future augmentation making electrochemical devices. The existing challenges prospects this field ratiocinated conclusion.

Language: Английский

Carbon nanotubes cross-linked Fe/Fe3C Nanoparticles and Fe Single Atoms as High-efficiency Bifunctional Oxygen Electrocatalyst for Rechargeable Zinc-Air Batteries

Electrochimica Acta, Journal Year: 2024, Volume and Issue: unknown, P. 145427 - 145427

Published: Nov. 1, 2024

Language: Английский