Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 16, Pages 8217-8224Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am402353m
Keywords
reduced graphene oxide-TaON nanocomposite; Co(bpy)(3)(3+/2+) redox couple; counter electrode; dye-sensitized solar cell
Funding
- National Basic Research Program of China [2011CB933302]
- National Natural Science Foundation of China [90922004, 51273045]
- STCSM [12JC1401500]
- Shanghai Pujiang Program [11PJ1401700]
- Jiangsu Major Program [BY2010147]
- Shanghai Leading Academic Discipline Project [B108]
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We report herein the investigation of TaON nanopartides incorporating a reduced graphene oxide (RGO) nanocomposite as a counter electrode for application in Co(bpy)(3)(3+/2+) (bpy = 2,2'-bipyridine)-mediated dye-sensitized solar cells (DSSCs). The RGO-TaON nanocomposite has been prepared by mixing graphene oxide (GO) and presynthesized TaON nanoparticles in ethanol/water followed by the facile hydrazine hydrate reduction of GO to RGO. Compared with RGO or TaON alone, the RGO-TaON nanocomposite shows a much higher electrocatalytic activity for the reduction of Co(bpy)(3)(3+) species owing to synergistic effects, resulting in significantly improved solar-cell performance when it is applied as the counter electrode in DSSCs. An efficiency of 7.65% for the DSSC with the RGO-TaON counter electrode is obtained, competing with the efficiency produced by the Pt counter electrode; additionally, the former exhibits a much better electrochemical stability than the latter in a Co(bpy)(3)(3+/2+) acetonitrile solution.
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