| Title | Facile synthesis of silk-cocoon S-rich cobalt polysulfide as an efficient catalyst for the hydrogen evolution reaction |
| Authors | Wang, Chao Wang, Tanyuan Liu, Jiajie Zhou, Yue Yu, Daiwei Cheng, Jeng-Kuei Han, Fei Li, Qing Chen, Jitao Huang, Yunhui |
| Affiliation | MIT, Dept Nucl Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA. Tongji Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China. Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China. Peking Univ, Coll Chem & Mol Engn, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China. MIT, Dept Aeronaut & Astronaut, Cambridge, MA 02139 USA. MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA. Natl Cent Univ, Inst Mat Sci & Engn, Taoyuan, Taiwan. Tongji Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China. Huang, YH (reprint author), Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China. Chen, JT (reprint author), Peking Univ, Coll Chem & Mol Engn, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China. |
| Keywords | AMORPHOUS MOLYBDENUM SULFIDE ACTIVE EDGE SITES MOS2 SULFUR ELECTROCATALYSIS OXYGEN ETHYLENEDIAMINE SUPERCAPACITORS NANOPARTICLES NANOMATERIALS |
| Issue Date | 2018 |
| Publisher | ENERGY & ENVIRONMENTAL SCIENCE |
| Citation | ENERGY & ENVIRONMENTAL SCIENCE. 2018, 11(9), 2467-2475. |
| Abstract | Tuning the structure, morphology, and electronic state is of great significance to achieve highly efficient hydrogen evolution reaction (HER) electrocatalysts. In this work, we originally develop a silk-cocoon structured S-rich cobalt polysulfide (CoSx, x approximate to 3.9) catalyst with extremely high HER activity through a facile hydrothermal process. The formation mechanism of the silk-cocoon structured CoSx has been systematically studied and the key factors in the formation of this structure are discussed. Such a nanostructured catalyst has hollow spheres that are interwoven by numerous sub-10 nm nanofibers to form into a three-dimensional conductive network by connection of micrometer long nanofibers. The silk-cocoon structured CoSx shows excellent HER activity with an onset potential of 0 V vs. a reversible hydrogen electrode and a Tafel slope of 41 mV dec(-1). The activity is much higher than that of the reported metal sulfide materials and is even comparable to commercial Pt/C. Moreover, the overpotential to yield a current density of 10 mA cm(-2) is only 42 mV. We ascribe the high HER activity to the S-rich sites and the conductive silk-cocoon structure, which can benefit the charge transfer of the material. Thus, this work provides a guiding strategy for synthesis of nanostructured transition metal polysulfides with enhanced HER catalytic performance. |
| URI | http://hdl.handle.net/20.500.11897/517652 |
| ISSN | 1754-5692 |
| DOI | 10.1039/c8ee00948a |
| Indexed | SCI(E) EI |
| Appears in Collections: | å å¦ä¸ å å å·¥ç¨ å¦é ¢ |
