Synthesis And Characterization For ORR Of N-Doped CNTS

Proton exchange membrane fuel cells (PEMFCs) are widely recognized as efficient and clean energy. As one of the key components of a PEMFC, the ORR electrocatalyst plays a critical role in determining the fuel cell’s performance, durability, and cost. Until now, the most frequently investigated ORR catalysts have been based on noble metals such as Pt and Pt alloys. However, the high cost of the Pt-based catalysts hindered the commercialization of fuel cells. In this paper, aniline, melamine, pyrrole actas nitrogen source for the preparation of the catalysts doped nitrogen carbon nanotubes, aimed at to prepare the cathode catalyst with low cost electrocatalysts. Moredetails are presented as following:1.Preparedmoderate oxidation tubes (moCNTs) Through traditional Hummer method and through the test (LSV, EIS, SEM, FT-IR) show that the outer wall was oxidized and the inwall was not.2.Using aniline as nitrogen source, prepared moCNTs/PANI-Fe electrocatalysts through in situ compound and pyrolysis technology, optimizing the pyrosis temperature and the mount of nitrogen. The electrochemical test demonstrated that a significant enhancement in intrinsic activity and onset potential (0.73V) for the ORR is observed when the temperature is 650 ℃ and the PANI proportion is mmoCNTs/PANI=1:0.4.3.Using aniline and melamine as nitrogen source, prepared moCNTs/PANI/Mela(FeCl3) electrocatalysts through in situ compound and pyrolysis technology, optimizing the pyrosis temperature and themount of nitrogen. The electrochemical test demonstrated that,The optimal moCNTs/PANI/Mela ratio was 1/13/6.5 and the optimal Fe content was 5wt%. The moCNTs/PANI/Mela(FeCl3) showed excellent activity toward oxygen reduction in an acidic medium, with the onset potential reaching 0.87 V. We suggest that the high catalytic performance may be due to the high content of graphitic nitrogen and the nanosheet structure.4.Using aniline and Pyrrole as nitrogen source, prepared moCNTs/PANI/Pyrr-Fe electrocatalysts through in situ compound and pyrolysis technology, optimizing the pyrosis temperature and themount of nitrogen. The electrochemical test demonstrated that a significant enhancement in intrinsic activity and onset potential (0.70V) for the ORR is observed when the temperature is 650 ℃ and the PANI proportion is mmoCNTs/PANI/Pyπ=1:0.8:0.4.