Designed NiMoC@C and NiFeMo2C@C core-shell nanoparticles for oxygen evolution in alkaline media

Frontiers in Chemistry

Chemistry

Xiang Li¹  Cristina Giordano² 

[1] Department of Chemistry, Queen Mary University of London, London, United Kingdom;null;

关键词: OER;    ternary transition metal;    nanoparticles;    core-shell structure;    graphitic carbon;    binary transition metal;    metal-metal carbide hybrid;    urea glass route;   

DOI  :  10.3389/fchem.2023.1162675

 received in 2023-02-09, accepted in 2023-03-28,  发布年份 2023

来源: Frontiers

【 摘 要 】

Electrochemical water splitting is one of the most promising and clean ways to produce hydrogen as a fuel. Herein, we present a facile and versatile strategy for synthesizing non-precious transition binary and ternary metal-based catalysts encapsulated in a graphitic carbon shell. NiMoC@C and NiFeMo2C@C were prepared via a simple sol-gel based method for application in the Oxygen Evolution Reaction (OER). The conductive carbon layer surrounding the metals was introduced to improve electron transport throughout the catalyst structure. This multifunctional structure showed synergistic effects, possess a larger number of active sites and enhanced electrochemical durability. Structural analysis indicated that the metallic phases were encapsulated in the graphitic shell. Experimental results demonstrated that the optimal core-shell material NiFeMo2C@C exhibited the best catalytic performance for the OER in 0.5 M KOH, reaching a current density of 10 mA cm-2 at low overpotential of 292 mV for the OER, superior to the benchmark IrO2 nanoparticles. The good performances and stability of these OER electrocatalysts, alongside an easily scalable procedure makes these systems ideal for industrial purposes.

【 授权许可】

Unknown   
Copyright © 2023 Li and Giordano.