@article{Sharma2022, 
author = {Lalita Sharma and Nirmal Kumar Katiyar and Arko Parui and Rakesh Das and Ritesh Kumar and Chandra Sekhar Tiwary and Abhisek K. Singh and Aditi Halder and Krishanu Biswas},
title = {Low-cost high entropy alloy (HEA) for high-efficiency oxygen evolution reaction (OER)},
year = {2022},
journal = {Nano Research},
volume = {15},
number = {6},
pages = {4799-4806},
keywords = {electrocatalyst, oxygen evolution reaction, high entropy alloy, cyclic voltammetry activation, nanocrystalline catalyst},
url = {https://www.sciopen.com/article/10.1007/s12274-021-3802-4},
doi = {10.1007/s12274-021-3802-4},
abstract = {Oxygen evolution reaction (OER) is the key step involved both in water splitting devices and rechargeable metal-air batteries, and hence, there is an urgent need for a stable and low-cost material for efficient OER. In the present investigation, Co-Fe-Ga-Ni-Zn (CFGNZ) high entropy alloy (HEA) has been utilized as a low-cost electrocatalyst for OER. Herein, after cyclic voltammetry activation, CFGNZ-nanoparticles (NPs) are covered with oxidized surface and form high entropy (oxy) hydroxides (HEOs), exhibiting a low overpotential of 370 mV to achieve a current density of 10 mA/cm2 with a small Tafel slope of 71 mV/dec. CFGNZ alloy has higher electrochemical stability in comparison to state-of-the art RuO2 electrocatalyst as no degradation has been observed up to 10 h of chronoamperometry. Transmission electron microscopy (TEM) studies after 10 h of long-term chronoamperometry test showed no change in the crystal structure, which confirmed the high stability of CFGNZ. The density functional theory (DFT) based calculations show that the closeness of d(p)-band centers to the Fermi level (EF) plays a major role in determining active sites.This work highlights the tremendous potential of CFGNZ HEA for OER, which is the primary reaction involved in water splitting.}
}