High surface area NiCoP nanostructure as efficient water splitting electrocatalyst for the oxygen evolution reaction

Maity, S and Singh, DK and Bhutani, D and Prasad, S and Waghmare, UV and Sampath, S and Muthusamy, E (2021) High surface area NiCoP nanostructure as efficient water splitting electrocatalyst for the oxygen evolution reaction. In: Materials Research Bulletin, 140 .

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Abstract

We present a simple route to synthesize of porous bi-metallic phosphides with large surface area supporting high density of electrochemically active sites, and demonstrate that resulting Ni0.2Co0.8P exhibits outstanding performance in catalysing oxygen evolution reaction (OER) under alkaline condition. It requires a very low over potential of 230 mV to achieve an anodic current density of 10 mA cm�2 with a Tafel slope of 44 mV dec�1. Ni0.2Co0.8P is also shown to perform well in catalyzing hydrogen evolution reaction (HER) under both alkaline (0.1 M KOH solution) and acidic conditions (0.5 M H2SO4 solution). Through first-principles theoretical analysis, we show that such high catalytic activity arises from the synergistic effect of Ni and Co on energies of d and p bands of Ni0.2Co0.8P, which is further enhanced by rapid mass transport possible due to the porous architecture of its three-dimensional network morphology. © 2021 Elsevier Ltd

Item Type:	Journal Article
Publication:	Materials Research Bulletin
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd
Keywords:	Bismuth compounds; Catalyst activity; Electrocatalysts; Morphology; Nanocatalysts; Phosphorus compounds; Potassium hydroxide, Bimetallics; Evolution reactions; High surface area; Metallics; Nano-catalyst; Oxygen evolution; Phosphide; Reaction under; Simple++; Water splitting, Electrocatalysis
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	20 Apr 2021 11:09
Last Modified:	20 Apr 2021 11:09
URI:	http://eprints.iisc.ac.in/id/eprint/68620

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