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Hongliang PENG, Zaiyong MO, Dai DANG, Lixian SUN, Fen XU, Shijun LIAO; The influence of various models for doped carbon catalysts: ORR performance and real fuel cell test; Advanced NanoMaterials and Technologies for Energy Sector; 2017:1(2):122-134
To investigate the influence of support material type on the performance of doped carbon catalysts, electrochemical catalysts of doped carbon were prepared by pyrolyzing polyaniline (PANI), using melamine, XC-72R and TiO2 as support material, respectively. For the oxygen reduction reaction (ORR), support material had a significant effect on the performance of catalysts due to their different morphologies, structures and active N content. Melamine, XC-72R and TiO2 led to graphene-like (Fe-PANI/C-Mela), disordered (Fe-PANI/C) and core-shell (Fe-PANI/C-TiO2) structure, respectively, and their ORR activities were in the sequence of Fe-PANI/C-Mela > Fe-PANI/C > Fe-PANI/C-TiO2, it was consistent with the order of BET surface area and active N content. It was demonstrated that the H2-air single cell with Fe-PANI/C-Mela as cathode catalyst, had a maximum power density of 290 mW cm−2 at cell temperature of 70oC. It was about 5 and 2.5 times that of Fe-PANI/C-TiO2 and Fe-PANI/C. It is suggested that melamine is an excellent support material of doped carbon catalysts. Melamine contains a lot of nitrogen, and in the high temperature it is decomposed; which lead to high surface. In this paper, the better ORR performance can be attributed to the more active N content, surface area and particular graphene-like structures, which plays significant roles in the catalytic activity. Different support materials, in the heat-treatment processes, will lead to different N group and active N contents, different microporosity and different surface areas, and result in different oxygen reduction reaction performance.