In situ Fabrication of Copper Nanocubes with Platinum Skin on 3D Graphene-Carbon Nanotubes Hybrid for Efficient Methanol Electrooxidation

摘要

Tuning the macro-morphology and micro-structure simultaneously of platinum (Pt)-basedelectrocatalysts is pivotal for enhancing catalytic performance, but still remains great challenge.Herein, we first report elaborate copper nanocubes with Pt skin on 3D reduced graphene oxide-carbonnanotubes (rGO@CNTs) support. Graphene oxide is used as a surfactant to disperse pristine CNTswith a little CuSO 4 for electrochemical preparation of macro-morphological rGO@CNTs supportingCu nanocubes, and subsequently reacted with H 2 PtCl 6 solution via galvanic replacement to realize Ptskin micro-structure. Cyclic voltammetry and chronoamperometry technique indicate that the resultantPt-Cu/rGO@CNTs catalyst is equipped with outstanding electrocatalytic activity and stability towardsmethanol oxidation reaction.