Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
Similarly to Molybdenum disulfide, tungsten diselenide may prove as a remarkable platform for advanced catalytic applications. Here, we report the synthesis of WSe2 doped by various transition metals (Fe, Co, Nb, Ni, Zr). Among the doped catalysts, Ni-WSe2 is the most promising electrocatalyst for electrochemical hydrogen evolution reaction. The controlled synthesis of Ni-doped nanostructures maintained similar morphology with feed ratios of 3%, 5% and 10% Ni, offering an opportunity to study the effect of Ni doping on the catalytic activity. The 10 % Ni-doped WSe2 exhibits a significantly improved HER performance with over potential at 10 mA cm-2 of 259 mV in acid with Tafel slope of 86 mV dec-1 and 215 mV in alkaline with Tafel slope of 109 mV dec-1, much better than reported for pristine and doped WSe2. Moreover, Ni-WSe2 possesses the smallest charge transfer resistance, which contributes to the facilitated faster catalytic reaction. The analysis shows that upon doping with up to 3% Ni, the catalytic enhancement originates from improved hydrogen adsorption (Hads). Beyond this threshold of Ni loading, the improved activity in alkaline medium results from optimized interaction of the OH/surface active sites. Using the density functional theory calculations, we identified two possible structures as the catalytic active sites: the Se atoms either bound to a substitutional Ni dopant or constituting a small patch of NiSe grafted on the WSe2 surface.
S. K. thanks the financial support of the Kreitman Post-Doctoral fellowship at the BGU. This centre of excellence was supported by The Israel Science foundation (grant No. 1212/21). A.E. acknowledges the support by Act 211 Government of the Russian Federation, contract № 02.A03.21.0006.
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