High entropy alloying strategy for accomplishing quintuple-nanoparticles grafted carbon towards exceptional high-performance overall seawater splitting

Raj, G and Nandan, R and Kumar, K and Gorle, DB and Mallya, AB and Osman, SM and Na, J and Yamauchi, Y and Nanda, KK (2023) High entropy alloying strategy for accomplishing quintuple-nanoparticles grafted carbon towards exceptional high-performance overall seawater splitting. In: Materials Horizons, 10 (11). 5032 -5044.

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Abstract

High entropy alloys (HEAs), a novel class of material, have been explored in terms of their excellent mechanical properties. Seawater electrolysis is a step towards sustainable production of carbon-neutral fuels such as H2, O2, and industrially demanding Cl2. Herein, we report a practically viable FeCoNiMnCr HEA nanoparticles system grafted on a conductive carbon matrix for promising seawater electrolysis. The comprehensive kinetics analysis of the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and chlorine evolution reaction (CER) confirms the effectiveness of our system. As an electrocatalyst, HEAs grafted on carbon black show trifunctionality with promising kinetics, selectivity and enduring performance, towards seawater splitting. We optimize high entropy alloy decorated/grafted carbon black (HEACB) catalysts, studying their synthesis temperature to scrutinize the effect of alloy formation variation on the catalysis efficacy. During the catalysis, selectivity between two mutually competing reactions, CER and OER, in the electrochemical catalysis of seawater is controlled by the reaction media pH. We employ Mott-Schottky measurements to probe the band structure of the intrinsically induced metal-semiconductor junction in the HEACB catalyst, where the carrier density and flat band potential are optimized. The HEACB sample provides promising results towards overall seawater electrolysis with a net half-cell potential of about 1.65 V with good stability, which strongly implies its broad practical applicability. © 2023 The Royal Society of Chemistry

Item Type:	Journal Article
Publication:	Materials Horizons
Publisher:	Royal Society of Chemistry
Additional Information:	The copyright for this article belongs to the Royal Society of Chemistry.
Keywords:	Carbon black; Electrocatalysis; Electrocatalysts; Electrolysis; Entropy; Grafting (chemical); Reaction kinetics; Semiconductor junctions, Alloy nanoparticle; Carbon neutral fuel; Chlorine evolution; Evolution reactions; High entropy alloys; Performance; Seawater electrolysis; Splittings; Sustainable production; ]+ catalyst, Nanoparticles
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	22 Nov 2023 06:28
Last Modified:	22 Nov 2023 06:28
URI:	https://eprints.iisc.ac.in/id/eprint/83203

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