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ZnO–graphene nanocomposites were synthesized by a one-pot method at room temperature, using graphene oxide as starting material, Zn powder as a precursor of ZnO and as reducing agent in mildly alkaline conditions, followed by post-treatment with potassium hydroxide solution. It is found that the ZnO nanoparticles (average diameter ∼14nm) were dispersed evenly on the graphene sheets. The resulting nanocomposites exhibited excellent capacitative performance (192Fg−1, 20.8kWkg−1) and fluorescent effect. [Copyright &y& Elsevier]