期刊
JOURNAL OF APPLIED ELECTROCHEMISTRY
卷 37, 期 8, 页码 913-919出版社
SPRINGER
DOI: 10.1007/s10800-007-9331-3
关键词
polymer electrolyte fuel cell; silica-nafion composite membrane; wettability; humidification; anode-catalyst layer
Incorporation of silica particles through a solgel process into the anode-catalyst layer with a sol-gel modified Nation-silica composite membrane renders easy retention of back-diffused water from the cathode to anode through the composite membrane electrolyte, increases the catalyst-layer wettability and improves the performance of the Polymer Electrolyte Fuel Cell (PEFC) while operating under relative humidity (RH) values ranging between 18% and 100% with gaseous hydrogen and oxygen reactants at atmospheric pressure. A peak power density of 300 mW cm(-2) is achieved at a load current-density value of 1200 mA cm(-2) for the PEFC employing a sol-gel modified Nafion-silica composite membrane and operating at 18% RH. Under similar operating conditions, the PEFC with a Membrane Electrode Assembly (MEA) comprising Nation-silica composite membrane with silica in the anode-catalyst layer delivers a peak power density of 375 mW cm-2. By comparison, the PEFC employing commercial Nafion membrane fails to deliver satisfactory performance at 18% RH due to the limited availability of water at its anode, acerbated electro-osmotic drag of water from anode to cathode and insufficient water back diffusion from cathode to anode causing the MEA to dehydrate.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据