Surface Modification of a NiS<sub>2</sub> Nanoarray with Ni(OH)<sub>2</sub> toward Superior Water Reduction Electrocatalysis in Alkaline Media — Ling Zhang (2017) | RDL Network
Surface Modification of a NiS<sub>2</sub> Nanoarray with Ni(OH)<sub>2</sub> toward Superior Water Reduction Electrocatalysis in Alkaline Media
Article 2017 en
Authors
LZ
Ling Zhang
IA
Ibrahim Saana Amiinu
XR
Xiang Ren
Abstract
1 min read
Interface engineering has been demonstrated to be effective in promoting hydrogen evolution reaction (HER) in an alkaline solution. Herein, we report that the HER activity of a NiS<sub>2</sub> nanoarray on a titanium mesh (NiS<sub>2</sub>/TM) in alkaline media is greatly boosted by the electrodeposition of Ni(OH)<sub>2</sub> onto NiS<sub>2</sub> [Ni(OH)<sub>2</sub>-NiS<sub>2</sub>/TM]. Ni(OH)<sub>2</sub>-NiS<sub>2</sub>/TM only needs an overpotential of 90 mV to deliver 10 mA cm<sup>-2</sup> in 1.0 M KOH. Density functional theory calculations confirm that Ni(OH)<sub>2</sub>-NiS<sub>2</sub> has a lower water dissociation free energy and a more optimal hydrogen adsorption free energy than NiS<sub>2</sub>.
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