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Sulphur edge and vacancy assisted nitrogen-phosphorus co-doped exfoliated tungsten disulfide: a superior electrocatalyst in hydrogen evolution reaction

Abstract

Currently, transition metal disulfides have been used as promising non-noble metal based electrocatalysts in hydrogen evolution reaction (HER) from water splitting in quest of alternatives renewable and clean energy sources. In view of this, present work reports the fabrication of N and P co-doped exfoliated tungsten disulphide (PNEWS2) as a superior electrocatalyst in HER. The high performance of PNEWS2 in imparting significantly lower potential (59 mV) correspond to geometrical current density of 10 mA cm−2 and Tafel slope (35 mV per decade). This could be attributed to the presence of high active sites in the exfoliated single layered porous 1T-WS2 network and synergistic effect of N and P doping. Further, evalaution of durability tests suggested excellent stability of PNEWS2 catalysts. Our multifaceted strategy on formation of flake like 1T phase with expanded interlayer spacings of PNEWS2 catalyst compared to WS2 revealed presence of increase S active edges , sulpher vacancy and higher lifetime (0.239 ms) facilitating extremely high electrochemically active surface area (Cdl = 37.1 mF cm−2) and high turn over frequency (0.791 s-1). Further, density functional theory (DFT) calculations on downshifting of d band, metallic phase and lowest Gibbs free energy of hyrogen adsorbed on PNEWS2 account for its excellent mass transport property. We have also established that electrochemical performance of PNEWS2 is no way associated with the dissolution/redeposition of Platinum from counter electrode (Pt). In summary, superior performance of nonprecious promising N-P-co-doped WS2 provided an alternative substitute to Pt based electrocatalyst.

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Publication details

The article was received on 18 Jul 2018, accepted on 10 Sep 2018 and first published on 11 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA06918B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Sulphur edge and vacancy assisted nitrogen-phosphorus co-doped exfoliated tungsten disulfide: a superior electrocatalyst in hydrogen evolution reaction

    A. Maiti and S. K. Srivastava, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA06918B

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