期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 16, 页码 8457-8464出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b00464
关键词
Ni0.85Se; mesoporous nanospheres; graphene; DSSCs
资金
- National Science Foundation of China [21271108]
- Ministry of Science and Technology [2014CB932001]
- China-U.S. Center for Environmental Remediation and Sustainable Development
Mesoporous Ni0.85Se nanospheres grown on graphene were synthesized via the hydrothermal approach. Because of the exceptional electron-transfer pathway of graphene and the excellent catalytic ability of the mesoporous Ni0.85Se nanospheres, the nanocomposites exhibited excellent electrocatalytic property as the counter electrode (CE) of dye-sensitized solar cells. More catalytic active sites, better charge-transfer ability and faster reaction velocity of Ni0.85Se@RGO (RGO = reduced graphene oxide) CE led to faster and more complete I-3(-) reduction than Pt, Ni0.85Se, and RGO CEs. Furthermore, the power conversion efficiency of Ni0.85Se@RGO CE reached 7.82%, which is higher than that of Pt CE (7.54%). Electrochemical impedance spectra, cyclic voltammetry, and Tafel polarization were obtained to demonstrate positive synergetic effect between Ni0.85Se and RGO, as well as the higher catalytic activity and the better charge-transfer ability of Ni0.85Se@RGO compared with Pt CE.
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