AUTHOR=Li Xiang , Giordano Cristina 

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

JOURNAL=Frontiers in Chemistry

VOLUME=11

YEAR=2023

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2023.1162675

DOI=10.3389/fchem.2023.1162675

ISSN=2296-2646

ABSTRACT=<p>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 NiFeMo<sub>2</sub>C@C were prepared <italic>via</italic> 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 NiFeMo<sub>2</sub>C@C exhibited the best catalytic performance for the OER in 0.5 M KOH, reaching a current density of 10 mA cm<sup>-2</sup> at low overpotential of 292 mV for the OER, superior to the benchmark IrO<sub>2</sub> nanoparticles. The good performances and stability of these OER electrocatalysts, alongside an easily scalable procedure makes these systems ideal for industrial purposes.</p>