Electrocatalyst Stability In PEMFCs And The Role Of Fuel Starvation And Cell Reversal Tolerant Anodes
Electrocatalyst Stability In PEMFCs And The Role Of Fuel Starvation And Cell Reversal Tolerant Anodes
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DOI：
10.1149/1.2214545
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发表时间：
2006-06
影响因子：
6.4
通讯作者：
T. Ralph;S. Hudson;D. Wilkinson
中科院分区：
文献类型：
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作者：
T. Ralph;S. Hudson;D. Wilkinson
质子交换膜燃料电池（PEMFC）阳极的严重燃料短缺会导致电池反转。在铂基阳极电催化剂上，通过水氧化和碳腐蚀达到高的正阳极电位以维持电流。膜电极组件（MEA）被不可逆地损坏，与MEA电接触的流场板和堆叠材料可能被腐蚀。最大限度地减少燃料短缺影响的最佳方法之一是在MEA中建立电池反转容忍度。开发了一种协议来研究单cell和堆栈硬件中cell反转的影响。通过监测阳极出口气体中的O2和CO2，确定了具有不同程度电池反转容限的mea的水氧化和碳腐蚀的相对量。采用更耐腐蚀的碳支架，在阳极催化剂层中添加特氟龙以保持水，并在阳极中部署水氧化电催化剂，显著提高了MEA的电池反转容忍度。
Gross fuel starvation at the anode of a proton exchange membrane fuel cell (PEMFC) can result in cell reversal. High positive anode potentials are reached to sustain the current by water oxidation and carbon corrosion at the Pt based anode electrocatalysts. The membrane electrode assembly (MEA) is irreversibly damaged and the flow field plates and stack material in electrical contact with the MEA can be corroded. One of the best approaches to minimise the impact of fuel starvation is to build cell reversal tolerance into the MEA. A protocol was developed to investigate the impact of cell reversal in single cell and in stack hardware. By monitoring the anode outlet gas for O2 and CO2 the relative amounts of water oxidation and carbon corrosion were established for MEAs with varying degrees of cell reversal tolerance. Moving to more corrosion resistant carbon supports, adding Teflon to the anode catalyst layer to retain water, and deploying a water oxidation electrocatalyst in the anode significantly improved the cell reversal tolerance of the MEA.