关键词: 热处理, Fe-N-C-t, 电催化, 氧还原, 动力学, 热处理, Fe-N-C-t, 电化学, 催化剂, 氧还原, 动力学

Abstract: In past decades，more intensive researches have been focused on the development of non-noble-metal catalysts for oxygen reduction reaction (ORR) in fuel cells in order to replace the Pt-based catalyst with high cost and scarcity，as fuel cells were recognized as one of the most promising power sources due to their high efficiency and low emissions. In present work，a natural polymer，chitosan (CS)，was reacted with salicylaldehyde to produce chitosan salicylaldehyde schiff-base (CS-Sal)，which then chelated with iron salt to obtain Fe complexes of chitosan salicylaldehyde schiff-base (Fe-CS-Sal). Subsequently，Fe-CS-Sal was mixed with high pure graphite and fully grinded with pestle in a mortar for homogeneous mixing to obtain carbon supported iron complex Fe-CS-Sal/C. Then，the resulting Fe-CS-Sal/C was heat-treated at different temperatures under N2 atmosphere getting a series of Fe-N-C-t (t= 200℃，400℃，600℃，800℃，1000℃) catalysts. Cyclic voltammetry (CV) and chronocoulometry (CC) in electrochemical workstation were used to study electrocatalytic performance of the Fe-N-C-t catalysts for oxygen reduction reaction (ORR). FT-IR and XRD were used to characterize the structure of Fe-N-C-t catalyst with different electrocatalytic activity to ORR. The ORR reaction kinetic parameters were further calculated according to cyclic voltammetry and the possible ORR mechanism occurring with the Fe-N-C-t catalysts was proposed in this paper.

Key words: heat treatment, Fe-N-C-T, electrocatalysis, oxygen reduction, kinetics, heat treatment, Fe-N-C-t, electrochemistry, catalysts, oxygen reduction, kinetics