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Xu F.,Nano Pico Center | Chen J.,Nanjing Southeast University | Wu X.,Nano Pico Center | Zhang Y.,Nano Pico Center | And 6 more authors.
Journal of Physical Chemistry C | Year: 2013

Graphene and ZnO as two star materials were united to constitute the photoanode of dye-sensitized solar cells (DSSCs). Highly electronically conductive graphene scaffolds incorporated into ZnO hierarchically structured nanoparticle (HSN) photoanodes could simultaneously capture and transport photogenerated electrons injected into ZnO by excited dyes. This strategy was beneficial for electrons to fluently transfer to the collection electrode due to the decreased internal resistance and electron recombination loss. On the basis of these advantages, the DSSC incorporating 1.2 wt % graphene into the ZnO photoanode with 3 μm in thickness exhibited a high short-circuit photocurrent density (Jsc) of 10.89 mA/cm2 and a power conversion efficiency (PCE) of 3.19%, which were increased by 43.48% and 38.09%, respectively, compared with those of the DSSC without graphene. It was found that the incorporated graphene could markedly prolong electron lifetime (τeff) and effective diffusion length (Ln), which allowed the utilization of thicker photoanodes that could afford enhanced surface area for higher dye loading and light harvesting. Thus, an impressively high PCE of 5.86% was achieved for the DSSC composed of 9-μm-thick ZnO photoanode, which could be the highest PCE compared with previous reports with the same thick photoanodes. These results demonstrate potential application of graphene for improving the performance of DSSCs. © 2013 American Chemical Society.

Wan S.,Nano Pico Center | Wan S.,Jiangnan University | Bi H.,Nano Pico Center | Bi H.,Jiangnan University | And 2 more authors.
Nanotechnology Reviews | Year: 2016

This paper provides a comprehensive review of recent progress in the synthesis and performance of graphene and carbon-based nanomaterials as efficient adsorbents for oils and organic solvents. Several advantages of these adsorbents are emphasized, including adjustable three-dimensional networks, high surface area, high chemical/thermal stability, high flexibility and elasticity, and extremely high surface hydrophobicity/oleophilicity. Technical challenges are discussed, and future research directions are proposed. © 2016 by De Gruyter.

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