氮掺杂空心碳纳米球嵌入氮掺杂石墨烯负载钯纳米粒子作为甲酸氧化的高效电催化剂OA北大核心CSTPCD

Efficient electrocatalysts with a low cost,high activity and good durability play a crucial role in the use of direct form-ic acid fuel cells.Pd nanoparticles supported on N-doped hollow carbon nanospheres(NHCNs)embedded in an assembly of N-doped graphene(NG)with a three-dimensional(3D)porous structure by a simple and economical method were investigated as direct form-ic acid fuel cell catalysts.Because of the unique porous configuration of interconnected layers doped with nitrogen atoms,the Pd/NHCN@NG catalyst with Pd nanoparticles has a large catalytic active surface area,superior electrocatalytic activity,a high steady-state current density,and a strong resistance to CO poisoning,far surpassing those of conventional Pd/C,Pd/NG,and Pd/NHCN catalysts for formic acid electrooxidation.When the HCN/GO mass ratio was 1∶1,the Pd/NHCN@NG catalyst had an outstanding performance in the catalytic oxidation of formic acid,with an activity 4.21 times that of Pd/C.This work indicates a way to produce superior carbon-based support materials for electrocatalysts,which will be beneficial for the development of fuel cells.