期刊

Nanoscale

标题

Homologous NiO//Ni2P nanoarrays grown on nickel foams: a well matched electrode pair with high stability in overall water splitting

作者

Jinlong Zheng, Wei Zhou, Tong Liu, Shijie Liu, Chengbo Wang and Lin Guo

摘要

Homologous NiO, Ni3S2, and Ni2P nanoarrays were obtained by thermolysis, sulfuration, and phosphorization of the Ni(SO4)0.3OH1.4 belt-like precursors. The three types of porous nickel compound films grown on nickel foam with a thickness of ∼8 μm have been used as anodes and cathodes in a two-electrode setup for overall water splitting. The electrode pairing of NixMy//NixMy (M = O, S, and P) for electrocatalysis in order of superiority is as follows: NiO//Ni2P > Ni3S2//Ni2P > Ni2P//Ni2P > Ni3S2//Ni3S2 > NiO//Ni3S2 > NiO//NiO. The other two sets of NixMy with different thicknesses of ∼5 and ∼11 μm also follow the abovementioned order. The well matched electrode pair of NiOOER//Ni2PHER only needs 1.65 V, whereas NiO//NiO pair needs 1.84 V to afford the current of 10 mA cm−2 in 1 mol L−1 of aqueous KOH solution. In particular, the current density retention of the NiO//Ni2P reached 92% after 120 hours of electrolysis at 1.70 V (NiO//NiO only maintains 72% after 30-hour electrolysis). The novelty of this study focuses on fabricating a well matched electrode pair to substantially enhance its electrochemical performance and durability, which would provide a new insight into developing non-noble, highly efficient, and stable electrode pairs.

原文链接

http://pubs.rsc.org/en/content/articlelanding/2017/nr/c6nr07953a#!divAbstract