Non-Precious Bimetallic CoCr Nanostructures Entrapped in Bamboo-Like Nitrogen-Doped Graphene Tube As a Robust Bifunctional Electrocatalyst for Total Water Splitting

Sarkar, B and Barman, BK and Nanda, KK (2018) Non-Precious Bimetallic CoCr Nanostructures Entrapped in Bamboo-Like Nitrogen-Doped Graphene Tube As a Robust Bifunctional Electrocatalyst for Total Water Splitting. In: ACS Applied Energy Materials, 1 (3). pp. 1116-1126.

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Abstract

Developing an efficient and cost-effective electrocatalyst for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) is of paramount importance for designing metal-air batteries and water electrolyzers. Herein, we present an economical approach for the synthesis of a bifunctional electrocatalyst consisting of cobalt-chromium nanostructures entrapped in a graphene tube doped with nitrogen (CoCr@NGT). The graphene tube is of a large size (cross-sectional diameter ∼ 100 nm) with a wall thickness of more than 10 graphene layers. The Cr alloying with the entrapped Co in the NGT drastically enhanced both the HER and OER performance with a low overpotential (η) and better current density along with long-term durability. Hence, CoCr@NGT can be used as a total alkaline water electrolyzer as both an anode and cathode catalyst delivering a current density of 10 mA/cm2 at around 1.58 V for a long period of time competing with the state-of-the-art combination of Pt-C and RuO2. The electrochemical performance strongly depends on the Cr due to its corrosion resistance capability and improved catalytic sites, which leads to long-term stability and very high activity, respectively.

Item Type:	Journal Article
Publication:	ACS Applied Energy Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to the American Chemical Society.
Keywords:	Binary alloys; Cobalt alloys; Corrosion resistance; Cost effectiveness; Doping (additives); Electrocatalysts; Electrodes; Electrolytic cells; Graphene; Metal-air batteries; Nanostructures; Nitrogen; Platinum compounds; Ruthenium compounds, Bifunctional electrocatalysts; bimetallic; Cross sectional diameters; Electrochemical performance; Hydrogen evolution reactions; N-doped; nonprecious; Water splitting, Chromium alloys
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	08 Aug 2022 09:21
Last Modified:	08 Aug 2022 09:21
URI:	https://eprints.iisc.ac.in/id/eprint/75610

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