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Uncovering the role of Ag in layer-alternating Ni3S2/Ag/Ni3S2as an electrocatalyst with enhanced OER performance

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Hu,  Zhiwei
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Guo, R., He, Y., Wang, R., You, J., Lin, H., Chen, C., et al. (2020). Uncovering the role of Ag in layer-alternating Ni3S2/Ag/Ni3S2as an electrocatalyst with enhanced OER performance. Inorganic Chemistry Frontiers, 7(19), 3627-3635. doi:10.1039/d0qi00611d.


Cite as: http://hdl.handle.net/21.11116/0000-0007-404C-C
Abstract
It is increasingly important to develop an efficient OER catalyst that can provide high current density at low overpotentials to improve water splitting efficiency. Here, layered Ni3S2/Ag/Ni3S2(N2A1) nanosheets have been grown directly on carbon clothviaa facile alternating electrodeposition method. Compared to the electrocatalyst Ni3S2/Ag(N1A1) with Ag as the innermost layer, the Ag/Ni3S2(A1N1) catalyst with Ni(3)S(2)nanosheets as the initial layer takes greater advantage of the low impedance for water splitting. Benefitting from the coexistence of different morphologies of Ni3S2, quasi-three-dimensional layered N2A1 exhibits excellent catalytic activity and stability toward OER, with an overpotential of 187 mV for 10 mA center dot cm(-2). Notably, based on the temperature-dependent measurement, the lower activation energy (E-a) of N2A1 is observed for the superior OER process. The roles of Ag in N2A1 were uncovered as affecting charge rearrangement, increasing electron transfer, and controlling morphology of Ni3S2.