47.<J. Power Sources>“Brick-like” N-doped graphene/carbon nanotubes structure forming three-dimensional films as high performance metal-free counter electrodes in dye-sensitized solar cells, 2014, 273, 1048-1055-同济环境功能材料实验室

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47.<J. Power Sources>“Brick-like” N-doped graphene/carbon nanotubes structure forming three-dimensional films as high performance metal-free counter electrodes in dye-sensitized solar cells, 2014, 273, 1048-1055

作者：时间：2018-05-11 点击数：

ABSTRACT:The “brick-like” N-doped graphene-carbon nanotube (NGC) composites are designed by mechanically grinding the ﬁltration ﬁlms, which are fabricated to form a three-dimensional structure ﬁlm as a counter electrode (CE). The N-doped graphene/carbon nanotube ﬁlms with a three-dimensional “brick-like” structure can provide numerous vertical active edge sites. The excellent electrochemical catalytic ac-tivities of CE can be obtained by adjusting the different ratio of graphene to CNTs to control the size and N-doping content of breaking particles. NGC17 CE based dye-sensitized solar cells (DSSC) have reached a high efﬁciency (6.74%) close to platinum-based cells (6.89%). The excellent efﬁciency may be attributed to the following factors: a) the DEP of NGC17 (304 mV) is lower than that of the Pt electrode (389 mV); b) the charge transfer resistance (Rct) at the NGC17-CE/electrolyte interface was 1.78 U cm-2, which is lower than that of a Pt-CE/electrolyte interface (8.97 U cm-2).

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