Cobalt Complexes as Cathode Catalysts Applied in PEMFC and AAEMFC

• Main Authors: Wei-ting Tsao, 曹維庭
• Other Authors: Wang, Chen-Hao
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/27526288145039317651

碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 102 === 　Recently due to energy crisis the development of alternative energy becomes an important issue. Fuel cell is an eco-friendly energy source. It uses hydrogen and oxygen as fuel and oxidant, respectivity, which the by product is water without pollutants. However, the fuel cell uses high cost of platinum as catalyst, making it high cost.Therefore, the goal of this study is to investigate the development of high-performance but low-cost non-precious metals catalysts. 　　The first part is to use the mixture of polypyrrole and vitamin B12 that are supported on carbon black (XC-72). After the mixture was pyroylzed by various temperatures, the pyrolyzed catalysts wae then applied in the cathode of a proton exchange membrane fuel cell (PEMFC) for oxygen reduction reaction (ORR). These catalysts show the highest ORR activity at the pyrolysis temperature of 700oC in 0.1M HClO4 and the electron-transfer number is 3.98. The PEMFC using the catalyst pyrolyzed at 700oC in the cathode side shows a maximum power density of 300 mW cm-2. 　　The second part is to use the mixture of graphene oxide and vitamin B12,which was pyrolyzed by various temperatures.According to the XPS analysis, the catalyse pyrolyzed at 900oC shows the most content of quaternary-N and pyridine-N bonding structure. The ORR activity is carried out in O2-saturated 0.1M KOH, the electron transfer number approached 3.90. The catalyst is applied in the cathode side of the anion alkaline exchange membrane fuel cell (AAEMFC) ,which shows the maximum power density of 65 mW cm-2.