Measurement and characterization of water cross-over in PEM fuel cells
Measurement and characterization of water cross-over in PEM fuel cells
批准号:
372206-2008
负责人:
Bi, Xiaotao(Tony)
金额:
$1.82万
依托单位国家:
加拿大
项目类别:
Collaborative Research and Development Grants
财政年份:
2009
资助国家:
加拿大
项目状态:
已结题
起止时间:
2009-01-01 至 2010-12-31
中文摘要
燃料电池技术是实现燃料经济性和减排目标的最有前途的候选人之一。聚合物电解质膜(PEM)燃料电池在汽车应用中的关键技术问题之一是水管理。PEM燃料电池中的水平衡对于PEM燃料电池的操作至关重要,并且其含义尚未完全理解。PEM电池内的膜需要完全水合,以减少由跨膜的电阻引起的欧姆损失。因此,电池或电池堆脱水降低了膜的质子传导率。太多的水导致电池的溢流,这阻碍了反应物气体的传质,并阻塞催化剂位点。
英文摘要
Fuel cell technology is one of the most promising candidates for achieving the fuel economy and emission reduction goals. One of the key technical callenges for polymer electrolyte membrane (PEM) fuel cells in automotive applications is the water management. The balance of water in a PEM fuel cell is critical to PEM fuel cell operation, and its implications are not yet fully understood. The membrane within a PEM cell needs to be fully hydrated in order to reduce ohmic losses caused by the resistance across the membrane. Thus cell or stack dehydration reduces the proton conductivity of the membrane. Too much water leads to flooding of the cell and which impedes the mass transfer of reactant gases, and block catalyst sites.
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