Yaxin Tong, Zengxin Jiang, Lijuan Yu, Yunyun Bai, Linfeng Gu, Pengkun Wang, Qiaoyun Chen, Mengjia Li, Yongyong Cao, Li Song* and Lei Li*,
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引用次数: 0
Abstract
Vacancy engineering is widely used to boost the hydrogen evolution reaction (HER) performance. However, dual-vacancy systems are more complex than mono-vacancy structures and remain underexplored. Key challenges involve developing emerging dual-vacancy catalysts, understanding their synergistic effects, and expanding their applications. Here, P/S dual vacancies were fabricated and coupled to heterostructures to improve HER performance. The as-synthesized WP/WS2–H heterostructures rich in P/S dual vacancies exhibit overpotentials of 175 and 170 mV at a current density of 10 mA cm–2 within 1 M KOH and 0.5 M H2SO4, respectively. The ability of P/S dual vacancies to promote HER activity of WP/WS2–H heterostructures is obviously higher than those of P and S mono-vacancy in WP–H and WS2–H. The heterojunctions of WP/WS2–H optimize the charge distribution, enhance the charge transfer rate, and increase the number of electrochemically active sites, thereby improving HER activities. Moreover, the as-fabricated Zn–H2O battery with WP/WS2–H as the cathode presents a maximum power density of up to 6.3 mW cm–2 and a stable discharge capacity of 69 h. This research not only provides a vigorous strategy for fabricating new dual-vacancy catalyst systems but also illustrates a synergistic effect and expands their application.
期刊介绍:
Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.