题目： | Ultrasmall and Phase-Pure W2C Nanoparticles for Efficient Electrocatalytic and Photoelectrochemical Hydrogen Evolution |
作者： | Qiufang Gong1,*, Yu Wang2,*, Qi Hu3, Jigang Zhou4, Renfei Feng4, Paul N. Duchesne5, Peng Zhang5, Fengjiao Chen1, Na Han1, Yafei Li2, Chuanhong Jin3, Yanguang Li1 & Shuit-Tong Lee1 |
1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China 2College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China 3State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China 4Canadian Light Source Inc., Saskatoon, Saskatchewan, Canada S7N 0X4 5Department of Chemistry, Dalhousie University, Halifax, Canada NS B3H 4R2 | |
摘要： | Earlier research has been primarily focused on WC as one of the most promising earth-abundant electrocatalysts for hydrogen evolution reaction (HER), whereas the other compound in this carbide family—W2C—has received far less attention. Our theoretical calculations suggest that such a focus is misplaced and W2C is potentially more HER-active than WC. Nevertheless, the preparation of phase pure and sintering-free W2C nanostructures represents a formidable challenge. Here we develop an improved carburization method and successfully prepare ultrasmall and phase-pure W2C nanoparticles. When evaluated for HER electrocatalysis, W2C nanoparticles exhibit a small onset overpotential of 50 mV, a Tafel slope of 45 mVdec-1 and outstanding long-term cycling stability, which are dramatically improved over all existing WC-based materials. In addition, the integration of W2C nanoparticles with p-type Si nanowires enables highly active and sustainable solar-driven hydrogen production. Our results highlight the great potential of this traditionally non-popular material in HER electrocatalysis. |
影响因子： | 11.329 |
分区情况： | 1区 |
链接： | http://www.nature.com/articles/ncomms13216 责任编辑：向丹婷 |