TixMo(1-x)O2 Supported Pt Catalyst And Its Electrochemical Performance

• Main Authors: Wang-Chih Dong, 董旺熾
• Other Authors: Bing-Joe Hwang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/5g2zbt

碩士 === 國立臺灣科技大學 === 化學工程系 === 103 === In this work, three types of TixMo(1-x)O2 catalyst-support, supporting Pt catalysis, were synthesized. Electrochemical performance was investigated for fuel cell application. Those three different catalyst-supports, namely TiO2@M, TiO2@TM, TiO2@M-150, were synthesized by hydrothermal method. The amount of Mo metal, acts as a metal dopant, increases, was varied. It is found that as the amount of metal dopant increases, both electrical conductivity and surface area of catalyst-support decrease, where Ti : Mo = 9 : 1 gives the best physical properties. After the deposition of Pt catalyst on TixMo(1-x)O2 catalyst-support, electrochemical performance was investigated. TiO2@TM catalyst-support with the ratio of Ti : Mo = 9 : 1 exhibits the best electrochemical activity. This superior performance is attributed to a higher surface area and improved electrical conductivity. XAS demonstrates that the higher electron population of Pt 5d-orbital improves the electrochemical activity for oxygen reduction reaction (ORR). After the hydrogen treatment, the oxygen vacancy is generated and then Pt was deposited on the TiO2@M and TiO2@TM. The electrochemical performance is improved after heat treatment. Pt/d-TiO2@TM has the highest on-set potential of 0.886V which is higher than the commercial catalysts JM 20Pt/C 0.865 V. Durability test shows the Pt/d-TiO2@TM has better durability when compared to the commercial catalyst (JM 20 Pt/C) and Pt/d-TiO2@M catalyst.