Affiliation:
1. Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering Southwest University Chongqing 400715 China
2. Guangxi Key Laboratory of Natural Polymer Chemistry and Physics Guangxi Teachers Education University Nanning 530001 China
Abstract
AbstractRational design of heterostructure catalysts through phase engineering strategy plays a critical role in heightening the electrocatalytic performance of catalysts. Herein, a novel amorphous/crystalline (a/c) heterostructure (a‐CoS/Ni3S2) is manufactured by a facile hydrothermal sulfurization method. Strikingly, the interface coupling between amorphous phase (a‐CoS) and crystalline phase (Ni3S2) in a‐CoS/Ni3S2 is much stronger than that between crystalline phase (c‐CoS) and crystalline phase (Ni3S2) in crystalline/crystalline (c/c) heterostructure (c‐CoS/Ni3S2) as control sample, which makes the meta‐stable amorphous structure more stable. Meanwhile, a‐CoS/Ni3S2 has more S vacancies (Sv) than c‐CoS/Ni3S2 because of the presence of an amorphous phase. Eventually, for the oxygen evolution reaction (OER), the a‐CoS/Ni3S2 exhibits a significantly lower overpotential of 192 mV at 10 mA cm−2 compared to the c‐CoS/Ni3S2 (242 mV). An exceptionally low cell voltage of 1.51 V is required to achieve a current density of 50 mA cm−2 for overall water splitting in the assembled cell (a‐CoS/Ni3S2 || Pt/C). Theoretical calculations reveal that more charges transfer from a‐CoS to Ni3S2 in a‐CoS/Ni3S2 than in c‐CoS/Ni3S2, which promotes the enhancement of OER activity. This work will bring into play a fabrication strategy of a/c catalysts and the understanding of the catalytic mechanism of a/c heterostructures.
Funder
National Natural Science Foundation of China
Program for Innovation Team Building at Institutions of Higher Education in Chongqing Municipality
Cited by
4 articles.
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