气候变化领域集成服务门户(CCPortal): In situ interfacial engineering of nickel tungsten carbide Janus structures for highly efficient overall water splitting

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DOI	10.1016/j.scib.2020.02.003
	In situ interfacial engineering of nickel tungsten carbide Janus structures for highly efficient overall water splitting
	Zhang S.; Gao G.; Zhu H.; Cai L.; Jiang X.; Lu S.; Duan F.; Dong W.; Chai Y.; Du M.
发表日期	2020
ISSN	20959273
起始页码	640
结束页码	650
卷号	65 期号:8
英文摘要	Regulating chemical bonds to balance the adsorption and disassociation of water molecules on catalyst surfaces is crucial for overall water splitting in alkaline solution. Here we report a facile strategy for designing Ni2W4C-W3C Janus structures with abundant Ni–W metallic bonds on surfaces through interfacial engineering. Inserting Ni atoms into the W3C crystals in reaction progress generates a new Ni2W4C phase, making the inert W atoms in W3C be active sites in Ni2W4C for overall water splitting. The Ni2W4C-W3C/carbon nanofibers (Ni2W4C-W3C/CNFs) require overpotentials of 63 mV to reach 10 mA cm−2 for hydrogen evolution reaction (HER) and 270 mV to reach 30 mA cm−2 for oxygen evolution reaction (OER) in alkaline electrolyte, respectively. When utilized as both cathode and anode in alkaline solution for overall water splitting, cell voltages of 1.55 and 1.87 V are needed to reach 10 and 100 mA cm−2, respectively. Density functional theory (DFT) results indicate that the strong interactions between Ni and W increase the local electronic states of W atoms. The Ni2W4C provides active sites for cleaving H–OH bonds, and the W3C facilitates the combination of Hads intermediates into H2 molecules. The in situ electrochemical-Raman results demonstrate that the strong absorption ability for hydroxyl and water molecules and further demonstrate that W atoms are the real active sites. © 2020 Science China Press
关键词	Interfacial engineering Janus structure Nickel tungsten carbide Water splitting
英文关键词	Alkalinity; Atoms; Bond strength (chemical); Density functional theory; Electrodes; Electrolytes; Electronic states; Hydrogen evolution reaction; Molecules; Oxygen evolution reaction; Tungsten carbide; Water absorption; Alkaline electrolytes; Alkaline solutions; Catalyst surfaces; Nickel-tungsten; Oxygen evolution reaction (oer); Strong absorptions; Strong interaction; Water splitting; Nickel compounds
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207297
作者单位	Key Laboratory of Synthetic and Biological Colloids (Ministry of Education), School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China; Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai, 200092, China; Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, 999077, Hong Kong
推荐引用方式 GB/T 7714	Zhang S.,Gao G.,Zhu H.,et al. In situ interfacial engineering of nickel tungsten carbide Janus structures for highly efficient overall water splitting[J],2020,65(8).
APA	Zhang S..,Gao G..,Zhu H..,Cai L..,Jiang X..,...&Du M..(2020).In situ interfacial engineering of nickel tungsten carbide Janus structures for highly efficient overall water splitting.Science Bulletin,65(8).
MLA	Zhang S.,et al."In situ interfacial engineering of nickel tungsten carbide Janus structures for highly efficient overall water splitting".Science Bulletin 65.8(2020).