Preparation Of Carbonized Polyaniline / Manganese Oxide Composites And Study On Electrocatalytic Performance Of Oxygen Reduction

The use of fossil fuels has brought great convenience to mankind, however it also caused acid rain, smog and global warming and other ungovernable recovery environmental problems. Therefore, in order to promote the sustainable development of human beings and the environment, development of energy conservation, the environmental protection of new energy is particularly necessary. As a new clean energy technologies, fuel cell technology as an environmentally-friendly, high efficiency conversion to be welcomed. However the high cost of platinum catalysts in fuel cells and stability has become a main technical bottleneck of restricting its commercialization. Therefore, development of new high efficiency of oxygen reduction reaction (ORR) catalyst became the research hot spot of academic circles.In this thesis, cathode non-precious metal catalysts with efficient ORR catalytic activity, stability and low price has been focused. Polyaniline hollow spheres were loaded with MnO2, followed by calcination process to carbonize PANI and crystallize MnO2, and finally CPANI/MnOx hybrid hollow spheres were maintained. The influence of different preparation conditions on the catalytic activity was studied. Fourier Transform Infrared Spectroscopy (FTIR), Transmission Electron Microscope (TEM), X-Ray Diffraction (XRD), High Resolution Transmission Electron Microscope (HR-TEM), X-Ray Photoelectron Spectroscopy (XPS) and Raman as the main characterization methods to observe the catalyst morphology, structure size, pore size and the crystal structure of MnOx. The activity and stability of CPANI/MnOx hybrid hollow spheres involved in ORR were studied through electrochemical methods.PANI/MnO2/SiO2 hollow spheres were synthesized through the template method, followed by calcination under inert atmosphere and SiO2 template removal processes, and finally mesoporous CPANI/MnOx hybrid hollow spheres were maintained. And we studied the effect of heat treatment temperature on the PANI carbonized degree and the crystal of MnOx. TEM、XRD、 XPS、HR-TEM and Raman techniques were used to reveal the catalyst structure, and electrical and electro-catalytic activity and stability of the catalyst in ORR were studied using cyclic voltammetry (CV), potential step technique-chronoamperometry (CA), the rotating ring disk electrode test (RRDE), AC impedance (PEIS), and other electrochemical methods.PANI/MnO2/PANI hollow spheres were synthesized through the template method, followed by calcination under inert atmosphere process, and finally mesoporous CpANI/MnO2/ CPANI hybrid hollow spheres were maintained. By regulating the amount of KMnO4 and aniline, shell thickness of MnO2 and outer PANI could be altered. FTIR, TEM, XPS, XRD and HR-TEM techniques were used to reveal the catalyst structure, and catalytic activity and stability of the catalyst in ORR were studied using CV, CA, RRDE, PEIS, and other electrochemical methods.