NDLI: Highly doped and exposed Cu(i)–N active sites within graphene towards efficient oxygen reduction for zinc

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Highly doped and exposed Cu(i)–N active sites within graphene towards efficient oxygen reduction for zinc–air batteries

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhao, Xinfei Bao, Xinhe Wang, Guoxiong Wu, Haihua Liu, Qingfei Guo, Xiaoguang Li, Haobo Wang, Jing Si, Rui Miao, Shu Yang, Fan Xie, Songhai Xiao, Jianping
Copyright Year	2016
Abstract	A coordinatively unsaturated copper–nitrogen architecture in copper metalloenzymes is essential for its capability to catalyze the oxygen reduction reaction (ORR). However, the stabilization of analogous active sites in realistic catalysts remains a key challenge. Herein, we report a facile route to synthesize highly doped and exposed copper(I)–nitrogen (Cu(I)–N) active sites within graphene (Cu–N©C) by pyrolysis of coordinatively saturated copper phthalocyanine, which is inert for the ORR, together with dicyandiamide. Cu(I)–N is identified as the active site for catalyzing the ORR by combining physicochemical and electrochemical studies, as well as density function theory calculations. The graphene matrix could stabilize the high density of Cu(I)–N active sites with a copper loading higher than 8.5 wt%, while acting as the electron-conducting path. The ORR activity increases with the specific surface area of the Cu–N©C catalysts due to more exposed Cu(I)–N active sites. The optimum Cu–N©C catalyst demonstrates a high ORR activity and stability, as well as an excellent performance and stability in zinc–air batteries with ultralow catalyst loading.
Starting Page	3736
Ending Page	3745
Page Count	10
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	9
Issue Number	12
Journal	Energy & Environmental Science
DOI	10.1039/c6ee01867j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	ORR Copper Redox Nitrogen Graphene Pyrolysis Phthalocyanine 2-Cyanoguanidine Active site Electrochemistry Specific surface area Zinc\u2013air battery
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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