Electrocatalytic Properties of Carbon nanofibers/carbon paper Composite Grown on Carbon Substrate

摘要

During the last two decades, CNFs have been intensively studied as catalyst materials for the possibility of tailoring their microstructures, such as the diameter, the graphite plane angle to the fiber axis, the ratio of edge atoms to basal atoms, etc., with certain preparation procedures. According to the 4 different arrangement of graphene layers, CNFs can commonly be divided into platelet CNFs (p-CNFs), tubular CNFs (t-CNFs) and fish-bone CNFs (f-CNFs), and the microstructure controllable CNFs have been used as supports for noble metal catalysts to improve the catalytic activity in recent years. For example, Bessel et al. [1] employed Pt/p-CNFs and Pt/XC-72 as electrocatalysts for methanol oxidation, and they revealed that 5 wt% Pt supported on p-GNFs was as active as 25 wt% Pt supported on XC-72. Also for methanol oxidation, Steigerwalt et al. [2] reported a 50% increase in activity when using Pt-Ru/f-CNFs as the electrocatalyst. Similarly, we revealed that Pd nanoparticles supported on p-CNFs had higher ORR activities than those on f-CNFs or activated carbon [3].