▎ 摘　　要

We use graphene oxide (GO) as a "surfactant" to obtain stable colloidal dispersion of carbon nanotubes (CNTs). CNT films are subsequently synthesized successfully without the addition of any traditional surfactants. Dye-sensitized solar cells assembled using the resulting CNT film as a counter electrode deliver a power conversion efficiency up to 5.29%. More importantly, the additional reduced graphene oxide significantly increases the electrical conductivity and the catalytic activity of the CNT film. The cell performance using a CNT film counter electrode (5.29%) reaches 68.70% of that of cells prepared using a platinum film counter electrode (7.70%). (C) 2013 Elsevier B.V. All rights reserved.