Interfacing Epitaxial Dinickel Phosphide to 2D Nickel Thiophosphate Nanosheets for Boosting Electrocatalytic Water Splitting

Qinghua Liang, Lixiang Zhong, Chengfeng Du, Yubo Luo, Jin Zhao, Yun Zheng, Jianwei Xu, Jianmin Ma, Chuntai Liu, Shuzhou Li*, Qingyu Yan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

181 Citations (Scopus)

Abstract

Heterostructures with abundant phase boundaries are compelling for surface-mediated electrochemical applications. However, rational design of such bifunctional electrocatalysts for efficient hydrogen and oxygen evolution reactions (HER and OER) is still challenging. Here, due to the well-matched lattice parameters, we easily achieved the epitaxy of two-dimensional ternary nickel thiophosphate (NiPS3) nanosheets with in-grown dinickel phosphide (Ni2P) through an in situ growth strategy. Density functional theory calculations reveal that the NiPS3/Ni2P heterojunction significantly decreases the kinetic barrier for hydrogen adsorption and accelerates electron transfer due to the built-in electric field at the epitaxial interfaces. The significantly improved electrocatalytic performance is shown to be closely related to the epitaxial interfacial area rather than the amount of secondary phase. Notably, the resultant NiPS3/Ni2P heterostructures enable an overall water splitting electrolyzer to achieve 50 mA cm-2 at a lower bias of 1.65 V compared to that for the pristine NiPS3 alone (2.02 V) and even the benchmark Pt/C//IrO2 electrocatalysts (1.69 V).

Original languageEnglish
Pages (from-to)7975-7984
Number of pages10
JournalACS Nano
Volume13
Issue number7
DOIs
Publication statusPublished - 23 Jul 2019
Externally publishedYes

Keywords

  • Epitaxial interfaces
  • Heterostructures
  • Hydrogen evolution
  • Nickel thiophosphate
  • Water splitting

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