Graphene nanoplatelets doped with N at its edges as metal-free cathodes for organic dye-sensitized solar cells

Myung Jong Ju, In-Yup Jeon, Jae Cheon Kim, Kimin Lim, Hyun-Jung Choi, Sun-Min Jung, In Taek Choi, Yu Kyung Eom, Young Jin Kwon, Jaejung Ko, Jae-Joon Lee, Hwan Kyu Kim, Jong-Beom Baek
Advanced Materials 2014 May 21, 26 (19): 3055-62
Challenging precious Pt-based electrocatalysts for dye-sensitized solar cells (DSSCs), graphene nanoplatelets that are N-doped at the edges (NGnPs) are prepared via simply ball-milling graphite in the presence of nitrogen gas. DSSCs based on specific nanoplatelets designated "NGnP5" display superior photovoltaic performance (power conversion efficiency, 10.27%) compared to that of conventional Pt-based devices (9.96%). More importantly, the NGnP counter electrode exhibits outstanding electrochemical stability and electrocatalytic activity with a cobalt-complex redox couple.

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