期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 24, 页码 12810-12819出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta02656c
关键词
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资金
- New & Renewable Energy Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korean Ministry of Trade, Industry, and Energy [20123010010160]
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [2011-0028604]
Electrocatalytic hydrogen evolution using non-precious metals or metal-free catalysts is critically necessary because platinum-based electrocatalysts are greatly limited in scalable commercialization of hydrogen generation due to their high cost. Here, we report the facile synthesis of metal-free hybrid catalysts, in which graphitic carbon nitride (g-C3N4) is coupled with nanoporous graphene doped by S and Se. The S and Se co-doped hybrid catalyst (g-C3N4@S-Se-pGr) reveals superior electrocatalytic performances, including an exchange current density of 6.27 x 10(-6) A cm(-2), an on-set potential of 0.092 V, a Tafel slope of 86 mV dec(-1), an adsorption free energy of -0.13 eV, and long-term stability comparable to those of commercial Pt/C catalysts. Volcano plots showing the hydrogen evolution activity versus adsorption free energy are also compatible with those of the conventional metal catalysts. Our strategy has the potential to allow a new paradigm for the development of high-performance metal-free electrocatalysts for energy conversion devices.
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