Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 3, Pages 2116-2123Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5083705
Keywords
N-doped graphene; cobalt mediator; porphyrin-sensitized solar cells; electrocatalytic reliability; surface wettability
Funding
- General Research Fund of the Research Grants Council of Hong Kong Special Administrative Region, China [HKU 712213E]
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A significant improvement in efficiency is achieved for porphyrin (YD2-o-C8) based dye-sensitized solar cells, coupled with [Co(bpy)(3)](3+/2+) mediator electrolyte. However, the poison of the counter electrode (CE) by the [Co(bpy)(3)](3+/2+) mediator remains a significant barrier to producing a reliable high-performance device. In this paper, nitrogen-doped graphene nanosheets (NG) are produced using a low-cost solution-based process and are used as the CE for [Co(bpy)(3)](3+/2+) based porphyrin-sensitized solar cells. These produce significantly better electrocatalytic activity than the commonly used Pt CE. The superior performance is a result of the increased number of catalytic sites and the wettable surface that is caused by the substitution of pyridinic and pyrrolic N into the carbon-conjugated lattice. To the authors best knowledge, the significantly improved cycling stability (>1000 times) of NG CE for [Co(bpy)(3)](3+/2+) redox complexes is demonstrated for the first time.
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