Journal
ELECTROCHIMICA ACTA
Volume 215, Issue -, Pages 223-230Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.08.091
Keywords
hydrogen evolution reaction; silk cocoons; electrocatalyst; N-rich carbon materials
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Funding
- National Natural Science Foundation of China (NSFC) [51373154, 51573166]
- Natural Science Foundation of Zhejiang Province [LQ16E020005]
- Program for Innovative Research Team of Zhejiang Sci-Tech University
- 521 Talent Project of Zhejiang Sci-Tech University
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We developed a facile method to synthesize porous and N-rich carbon materials derived from Bombyx mori silk cocoons with an activation and thermal carbonization process. The silk-derived nanosheets carbon fibers consist of a porous and multilayer structure, endowing the materials with high surface area of 349.3 m(2) g(-1) and much exposed active sites. The synthesized N-rich (4.7%) carbon materials are employed as electrocatalysts for hydrogen evolution reaction (HER) and exhibit incredible catalytic performance as well as promising electrochemical durability, which are mainly attributed to the large amount of exposed active sites, high graphitization degree and the rich nitrogen elements, especially pyridine-N and graphitic-N. Typically, the silk-derived nanosheets carbon fibers activated by KCI afford a low onset potential of -63 mV (vs. RHE), a low overpotential of 137 mV at 10 mA cm(-2) and a Tafel slope of 132 mV dec(-1). The results may offer a novel and promising method for the preparation of non-metal HER catalysts derived from abundant biomass. (C) 2016 Elsevier Ltd. All rights reserved.
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