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Title: Interfacing epitaxial dinickel phosphide to 2D nickel thiophosphate nanosheets for boosting electrocatalytic water splitting
Authors: Liang, Qinghua
Zhong, Lixiang
Du, Chengfeng
Luo, Yubo
Zhao, Jin
Zheng, Yun
Xu, Jianwei
Ma, Jianmin
Liu, Chuntai
Li, Shuzhou
Yan, Qingyu
Keywords: Science::Chemistry
Issue Date: 2019
Source: Liang, Q., Zhong, L., Du, C., Luo, Y., Zhao, J., Zheng, Y., . . . Yan, Q. (2019). Interfacing epitaxial dinickel phosphide to 2D nickel thiophosphate nanosheets for boosting electrocatalytic water splitting. ACS Nano, 13(7), 7975-7984. doi:10.1021/acsnano.9b02510
Project: RG113/15 
Journal: ACS Nano 
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).
ISSN: 1936-0851
DOI: 10.1021/acsnano.9b02510
Schools: School of Materials Science & Engineering 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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