期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 7, 页码 8976-8982出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b01348
关键词
MXene nanofibers; Hydrogen evolution reaction; Specific surface area; Active sites
资金
- National Key R&D Program of China [2017YFB1103500]
- National Natural Science Foundation of China [51302220, 51672218, 51632007]
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201845]
Nonprecious metal catalysts for hydrogen evolution reaction (HER) have recently received growing attention. Herein, we designed a highly active MXene nanofiber catalyst with a high specific surface area (SSA) via the hydrolyzation of bulk MAX ceramics, and a subsequent HF etching process. Compared with traditional MXene flakes, the MXene nanofibers delivered a much higher SSA and exposed more active sites in the cross section. As a result, the MXene nanofiber delivered an enhanced HER activity with a low overpotential of 169 mV at a current density of 10 mA cm(-2), a depressed Tafel slope of 97 mV dec(-1), and low electrochemical resistance. The improved SSA and exposed active sites are responsible for the enhanced activity. This work provides a novel synthesis method for MXene nanofibers, and MXene nanofibers are also promising for applications in batteries, supercapacitors, and catalytic fields.
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