globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2020.02.003
论文题名:
In situ interfacial engineering of nickel tungsten carbide Janus structures for highly efficient overall water splitting
作者: Zhang S.; Gao G.; Zhu H.; Cai L.; Jiang X.; Lu S.; Duan F.; Dong W.; Chai Y.; Du M.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期:8
起始页码: 640
结束页码: 650
语种: 英语
中文关键词: 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
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
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170152
Appears in Collections:气候变化与战略

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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

Recommended Citation:
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]. Science Bulletin,2020-01-01,65(8)
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