Performance and degradation of high temperature polymer electrolyte fuel cell catalysts
- 作者：A.S. Aricò ; A. Stassi ; E. Modica ; R. Ornelas ; I. Gatto ; E. Passalacqua ; V. Antonucci
- 关键词：PEMFCs ; High temperature ; Automotive ; Pt catalysts ; Pt alloys
- 刊名：Journal of Power Sources
- 出版年：2008
- 期刊代码：58_03787753
- 类别：ce
- 出版时间：1 April 2008
- 卷：178
- 期：2
- 页码：525-536
- 文件大小：2348 K
摘要
An investigation of carbon-supported Pt/C and PtCo/C catalysts was carried out with the aim to evaluate their stability under high temperature polymer electrolyte membrane fuel cell (PEMFC) operation. Carbon-supported nanosized Pt and PtCo particles with a mean particle size between 1.5 nm and 3 nm were prepared by using a colloidal route. A suitable degree of alloying was obtained for the PtCo catalyst by using a carbothermal reduction. The catalyst stability was investigated to understand the influence of carbon black corrosion, platinum dissolution and sintering in gas-fed sulphuric acid electrolyte half-cell at 75 °C and in PEMFC at 130 °C. Electrochemical active surface area and catalyst performance were determined in PEMFC at 80 °C and 130 °C. A maximum power density of about 700 mW cm−2 at 130 °C and 3 bar abs. O2 pressure with 0.3 mg Pt cm−2 loading was achieved. The PtCo alloy showed a better stability than Pt in sulphuric acid after cycling; yet, the PtCo/C catalyst showed a degradation after the carbon corrosion test. The PtCo/C catalyst showed smaller sintering effects than Pt/C after accelerated degradation tests in PEMFC at 130 °C.