Ontology type: schema:ScholarlyArticle
2018-04
AUTHORSDaobin Liu, Chuanqiang Wu, Shuangming Chen, Shiqing Ding, Yaofeng Xie, Changda Wang, Tao Wang, Yasir A. Haleem, Zia ur Rehman, Yuan Sang, Qin Liu, Xusheng Zheng, Yu Wang, Binghui Ge, Hangxun Xu, Li Song
ABSTRACTAtomically 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-Nx 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 ∼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. More... »
PAGES2217-2228
http://scigraph.springernature.com/pub.10.1007/s12274-017-1840-8
DOIhttp://dx.doi.org/10.1007/s12274-017-1840-8
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