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Issue 39, 2018
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VS2: an efficient catalyst for an electrochemical hydrogen evolution reaction in an acidic medium

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Abstract

In view of preparing efficient electrocatalysts for energy conversion applications, we have developed an eco-friendly, cost effective, single step method for the scalable synthesis of VS2 and its reduced graphene oxide composite VS4/rGO. Furthermore, the electrocatalytic performances of the catalysts have been studied toward the hydrogen evolution reaction in an acid medium (0.1 M H2SO4). Presumably, the large exposed electrochemical active surface area (27.7 cm2) and hexagonal crystal lattice of VS2 result in its dominating catalytic performance over that of the linear VS4/rGO composite. Also, a VS2 modified electrode was demonstrated to have better stability (with a negligible change in the overpotential even after 10 h and 43 h of continuous electrolysis) with a notably low Tafel slope (36 mV dec−1, close to that of commercial Pt/C) and onset potential (15 mV vs. RHE) with robust durability for long term application. A preliminary study on the photoelectrochemical activities of VS2 showed a significant decrease in the charge transfer resistance upon illumination of light on the electrode surface.

Graphical abstract: VS2: an efficient catalyst for an electrochemical hydrogen evolution reaction in an acidic medium

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Publication details

The article was received on 22 Jun 2018, accepted on 23 Jul 2018 and first published on 23 Jul 2018


Article type: Paper
DOI: 10.1039/C8DT02547A
Citation: Dalton Trans., 2018,47, 13792-13799
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    VS2: an efficient catalyst for an electrochemical hydrogen evolution reaction in an acidic medium

    J. K. Das, A. K. Samantara, A. K. Nayak, D. Pradhan and J. N. Behera, Dalton Trans., 2018, 47, 13792
    DOI: 10.1039/C8DT02547A

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