Abstract
Direct methanol fuel cell technology recently becomes the focus of both academic and engineering cir-cles,which stimulates the exploitation and utilization of advanced electrode catalysts with high activity and long lifespan.Herein,we demonstrate a robust bottom-up approach to the spatial construction of three-dimensional(3D)spinel manganese-cobalt oxide-modified N-doped graphene nanoarchitectures decorated with ultrasmall Pt nanoparticles(Pt/MnCo2O4-NG)via a controllable self-assembly process.The incorporation of MnCo2O4 nanocrystals provides abundant hydroxyl sources to pro-mote the oxidative removal of CO-like byproducts on Pt sites,while the existence of 3D porous N-doped graphene networks facilitates the transportation of both ions and electrons in the hybrid system,thus giving rise to remarkable synergetic coupling effects during the methanol oxidation process.Consequently,the optimized Pt/MnCo2O4-NG nanoarchitecture expresses exceptional electrocatalytic properties with a large electrochemically active surface area of 99.5 m2·g-1,a high mass activity of 1508.3 mA·mg-1,strong toxicity resistance and reliable long-term durability,which have obvious competitive advantages over those of conventional Pt/carbon black,Pt/carbon nanotube,Pt/graphene,and Pt/N-doped graphene catalysts with the same Pt usage.
基金项目
National Natural Science Foundation of China(22209037)
National Natural Science Foundation of China(51802077)
Fundamental Research Funds for the Central Universities(B220202042)
NETL
NSTL
万方数据