气候变化领域集成服务门户(CCPortal): Hierarchical CoP/Ni5P4/CoP microsheet arrays as a robust pH-universal electrocatalyst for efficient hydrogen generation

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DOI	10.1039/c8ee01270a
	Hierarchical CoP/Ni5P4/CoP microsheet arrays as a robust pH-universal electrocatalyst for efficient hydrogen generation
	Mishra I.K.; Zhou H.; Sun J.; Qin F.; Dahal K.; Bao J.; Chen S.; Ren Z.
发表日期	2018
ISSN	17545692
起始页码	2246
结束页码	2252
卷号	11 期号:8
英文摘要	Highly active catalysts composed of earth-abundant materials, performing as efficiently as Pt catalysts, are crucial for sustainable hydrogen production through water splitting. However, most efficient catalysts consist of nanostructures made via complex synthetic methods, making scale-up quite challenging. Here we report an effective strategy for developing a very active and durable pH-universal electrocatalyst for the hydrogen evolution reaction (HER). This catalyst is constructed using a sandwich-like structure, where hierarchical cobalt phosphide (CoP) nanoparticles serve as thin skins covering both sides of nickel phosphide (Ni5P4) nanosheet arrays, forming self-supported sandwich-like CoP/Ni5P4/CoP microsheet arrays with lots of mesopores and macropores. The as-prepared electrocatalyst requires an overpotential of only 33 mV to achieve a benchmark of 10 mA cm-2, with a very large exchange current density and high turnover frequencies (TOFs) in acid media, superior to most electrocatalysts made of metal phosphides, well-known MoS2 and WS2 catalysts, and it performs comparably to state-of-the-art Pt catalysts. In particular, this electrocatalyst shows impressive operational stability at an extremely large current density of 1 A cm-2, indicating its possible application toward large-scale water electrolysis. Additionally, this electrocatalyst is very active in alkaline electrolyte (71 mV at 10 mA cm-2), which demonstrates its pH universality as a HER catalyst with outstanding catalytic activity. This simple strategy does not involve any solvothermal and hydrothermal processes, paving a new avenue toward the design of robust non-noble electrocatalysts for hydrogen production, aimed at commercial water electrolysis. © 2018 The Royal Society of Chemistry.
英文关键词	Alkalinity; Catalyst activity; Catalyst supports; Cobalt compounds; Cobalt deposits; Electrocatalysts; Electrolysis; Electrolytes; Layered semiconductors; Molybdenum compounds; Nickel compounds; Phosphorus compounds; Platinum; Tungsten compounds; Alkaline electrolytes; Earth-abundant materials; Exchange current densities; Hydrogen evolution reactions; Large current density; Non-noble electrocatalysts; Operational stability; Sandwich-like structure; Hydrogen production; array; catalyst; cobalt; electric field; electrochemistry; electrolyte; gas production; hydrogen; nanoparticle; pH; phosphorus; platinum
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190166
作者单位	Department of Physics, TcSUH, University of Houston, Houston, TX 77204, United States; Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control, Ministry of Education, School of Physics and Electronics, Hunan Normal University, Changsha, 410081, China; Department of Electrical and Computer Engineering, University of Houston, Houston, TX 77204, United States
推荐引用方式 GB/T 7714	Mishra I.K.,Zhou H.,Sun J.,et al. Hierarchical CoP/Ni5P4/CoP microsheet arrays as a robust pH-universal electrocatalyst for efficient hydrogen generation[J],2018,11(8).
APA	Mishra I.K..,Zhou H..,Sun J..,Qin F..,Dahal K..,...&Ren Z..(2018).Hierarchical CoP/Ni5P4/CoP microsheet arrays as a robust pH-universal electrocatalyst for efficient hydrogen generation.Energy & Environmental Science,11(8).
MLA	Mishra I.K.,et al."Hierarchical CoP/Ni5P4/CoP microsheet arrays as a robust pH-universal electrocatalyst for efficient hydrogen generation".Energy & Environmental Science 11.8(2018).