A Graphene Composite Material with Single Cobalt Active Sites: A Highly Efficient Counter Electrode for Dye-Sensitized Solar Cells

被引:244
作者
Cui, Xiaoju [1 ]
Xiao, Jianping [1 ]
Wu, Yihui [2 ]
Du, Peipei [3 ]
Si, Rui [3 ]
Yang, Huaixin [4 ]
Tian, Huanfang [4 ]
Li, Jianqi [4 ]
Zhang, Wen-Hua [2 ]
Deng, Dehui [1 ]
Bao, Xinhe [1 ]
机构
[1] Chinese Acad Sci, Dalian Inst Chem Phys, Collaborat Innovat Ctr Chem Energy Mat, State Key Lab Catalysis, Zhongshan Rd 457, Dalian 116023, Peoples R China
[2] China Acad Engn Phys, Inst Chem Mat, Sichuan Res Ctr New Mat, 596 Yinhe Rd, Chengdu 610200, Peoples R China
[3] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China
[4] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
cobalt; composite materials; counter electrode; dye-sensitized solar cells; graphene; OXYGEN REDUCTION; CATALYSIS;
D O I
10.1002/anie.201602097
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The design of catalysts that are both highly active and stable is always challenging. Herein, we report that the incorporation of single metal active sites attached to the nitrogen atoms in the basal plane of graphene leads to composite materials with superior activity and stability when used as counter electrodes in dye-sensitized solar cells (DSSCs). A series of composite materials based on different metals (Mn, Fe, Co, Ni, and Cu) were synthesized and characterized. Electrochemical measurements revealed that CoN4/GN is a highly active and stable counter electrode for the interconversion of the redox couple I-/I-3(-). DFT calculations revealed that the superior properties of CoN4/GN are due to the appropriate adsorption energy of iodine on the confined Co sites, leading to a good balance between adsorption and desorption processes. Its superior electrochemical performance was further confirmed by fabricating DSSCs with CoN4/GN electrodes, which displayed a better power conversion efficiency than the Pt counterpart.
引用
收藏
页码:6708 / 6712
页数:5
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