Air (oxygen) Electrode Catalyst, Doping, Modified And Electrochemical Properties Of Study

Gas diffusion electrodes, which are widely used in alkaline fuel cells and air batteries, have a great effect on the performance of batteries. But the oxygen reduction reaction (ORR) on electrode critically obstructs the development of those batteries due to small reversible characteristics and difficult process. The most effective factor on gas diffusion electrodes is dependent on catalyzer.In this paper, we prepared Mn-doped catalyst, and obtained high-performance catalyst for the best preparation conditions and to optimize the preparation process of the air electrode, by orthogonal experiments.Meanwhile, two kinds of ORR catalysts, iron phthalocyanine (FePc) and cobalt phthalocyanine (CoPc) were prepared by microwave radiation.The results showed that the catalyst preparation process of doped NiSO₄ and La₂O can obviously improve the electrochemical properties of manganese-doped catalysts La₂O₃ at a ratio of 5% doped, sintering temperature of 380℃and sintering time of 2h under the conditions of doped catalyst performance. phthalocyanine (FePc) and cobalt phthalocyanine (CoPc)with maximum yield and superior catalytic perfoamance were obtained in the following optimized preparation conditions, time for microwave radiation 500s, molar ratio of phthalic anhydride and urea 1:5, and weight percent of ammonium molybdate corresponding to phthalic anhydride 4%. In the potential of -0.2V(vs. HgO/Hg), the current density of catalytic ORR was 49 for FePc and 80 mA·cm^-2 for CoPc respectively. Simultaneously, the catalyst shows the best performance with ratio of 1:2 for metal catalyst and C carrier. This paper also investigated on a gas diffusion electrode at different temperatures for the heat-treatment to metal phthalocyanine catalytic, idicating the best results of 260℃.