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Halder, A.
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Publications (3/3 displayed)
- 2023Understanding the evolution of catalytically active multi-metal sites in a bifunctional high-entropy alloy electrocatalyst for zinc–air battery applicationcitations
- 2021Low-cost high entropy alloy (HEA) for high-efficiency oxygen evolution reaction (OER)citations
- 2013Friction in total hip joint prosthesis measured in vivo during walking.citations
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article
Low-cost high entropy alloy (HEA) for high-efficiency oxygen evolution reaction (OER)
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 beenbserved up to 10 h of chronoamperometry. Transmission electron microscopy (TEM) studies after 10 h of long-termchronoamperometry 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.