期刊
NANO RESEARCH
卷 11, 期 4, 页码 2217-2228出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1840-8
关键词
single metal atoms (SMAs); high loading; X-ray absorption fine structure spectroscopy (XAFS); high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM); oxygen reduction reaction (ORR)
类别
资金
- Ministry of Science and Technology (MOST) [2017YFA0303500, 2014CB848900]
- National Natural Science Foundation of China (NSFC) [U1532112, 11574280, 11605201]
- CAS Interdisciplinary Innovation Team
- CAS Key Research Program of Frontier Sciences [QYZDB-SSW-SLH018]
Atomically dispersed catalysts have attracted attention in energy conversion applications because their efficiency and chemoselectivity for special catalysis are superior to those of traditional catalysts. However, they have limitations owing to the extremely low metal-loading content on supports, difficulty in the precise control of the metal location and amount as well as low stability at high temperatures. We prepared a highly doped single metal atom hybrid via a single-step thermal pyrolysis of glucose, dicyandiamide, and inorganic metal salts. High-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption fine structure spectroscopy (XAFS) revealed that nitrogen atoms doped into the graphene matrix were pivotal for metal atom stabilization by generating a metal-N-x coordination structure. Due to the strong anchoring effect of the graphene matrix, the metal loading content was over 4 wt.% in the isolated atomic hybrid (the Pt content was as high as 9.26 wt.% in the Pt-doped hybrid). Furthermore, the single iron-doped hybrid (Fe@N-doped graphene) showed a remarkable electrocatalytic performance for the oxygen reduction reaction. The peak power density was similar to 199 mW.cm(-2) at a current density of 310 mA.cm(-2) and superior to that of a commercial Pt/C catalyst when it was used as a cathode catalyst in assembled zinc-air batteries. This work offered a feasible approach to design and fabricate highly doped single metal atoms (SMAs) catalysts for potential energy applications.
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