Carbon fiber paper(CFP) wrapped with reduced graphene oxide(rGO) film as the composite support(rGO/CFP) of Pt catalysts was studied. It was found that rGO could affect the size and morphology of Pt nanocrystals(NCs). Concave nanocubes(CNC) Pt NCs~ 20 nm were uniformly electrodeposited on high reduced HrGO/CFP while irregular Pt NCs~62 nm were loaded on low reduced LrGO. Compared with Pt-LrGO/CFP and Pt-MrGO/CFP, the CNC Pt-HrGO/CFP exhibited a higher electrochemically active surface area(121.7 m~2 g~(-1)), as well as enhanced electrooxidation activity of methanol(499 mA mg~(-1)) and formic acid(950 mA mg~(-1)). The results further demonstrated that the CNC Pt-HrGO/CFP could serve as the gas diffusion electrode in fuel cells and yielded a satisfactory performance(1855 mW mg~(-1)). The work can provide an attractive perspective on the convenient preparation of the novel gas diffusion electrode for proton exchange membrane fuel cells. It was found that rGO could affect the size and morphology of Pt nanocrystals (NCs). Concave nanocubes (NCs) Concave nanocubes (rGO / CFP) wrapped with reduced graphene oxide Compared with Pt-LrGO / CFP and Pt-MrGO / CFP, the CNC Pt-HrGO / CFP exhibited a higher electrochemically active surface area (121.7 m ~ 2 g -1), as well as enhanced electrooxidation activity of methanol (499 mA mg -1) and formic acid (950 mA mg ~ (- 1)) the results furthermore demonstrated that the CNC Pt-HrGO / CFP could serve as the gas diffusion electrode in fuel cells and yielded a satisfactory performance (1855 mW mg -1). The work can provide an attractive perspective on the convenient preparation of the novel gas diffusion electrode for proton exchange membrane fuel cells.