An investigation into factors affecting the stability of carbons and carbon supported platinum and platinum/cobalt alloy catalysts during 1.2 V potentiostatic hold regimes at a range of temperatures
An investigation into factors affecting the stability of carbons and carbon supported platinum and platinum/cobalt alloy catalysts during 1.2 V potentiostatic hold regimes at a range of temperatures
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在一定温度范围内 1.2 V 恒电位保持状态下影响碳和碳负载铂和铂/钴合金催化剂稳定性的因素的研究
DOI：
10.1016/j.jpowsour.2006.11.004
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发表时间：
2007
影响因子：
9.2
通讯作者：
B. Theobald
中科院分区：
文献类型：
--
作者：
S. Ball;S. Hudson;D. Thompsett;B. Theobald
为了满足燃料电池运行的汽车目标，并允许更高的温度运行，了解影响碳和铂稳定性的因素是至关重要的。在1.2V对RHE恒电位保持测试期间，在一系列温度下，在三室湿电解质电池中使用碳和催化剂涂覆的电极，研究了碳和碳负载的铂和铂/钴合金催化剂的稳定性。在80°C下，腐蚀的碳的wt%随着BET面积的增加而增加。表面氧化之后，电化学使用醌/氢醌氧化还原对。在1.2V下增加温度、时间和碳上铂的重量%增加表面氧化。虽然增加温度显示出增加碳腐蚀的程度，但催化碳并没有显著改变多少碳被腐蚀。铂的稳定性通过电化学金属面积损失（ECA）进行了研究。随着温度的升高，商业碳上的铂催化剂损失更多的ECA。在低表面积碳上的铂/钴合金被证明在高达80°C的温度下比在商业碳上的铂催化剂对碳腐蚀和金属面积损失更稳定，使这种材料成为高温汽车操作的优秀候选者。
To meet automotive targets for fuel cell operation and allow higher temperature operation an understanding of the factors affecting carbon and platinum stability is critical. The stability of both carbons and carbon supported platinum and platinum/cobalt alloy catalysts was studied during 1.2V versus RHE potentiostatic hold tests using carbon and catalyst coated electrodes in a three-chamber wet electrolyte cell at a range of temperatures. At 80°C the wt% of carbon corroded increases with increasing BET area. Surface oxidation was followed electrochemically using the quinone/hydroquinone redox couple. Increasing temperature, time at 1.2V and wt% platinum on the carbon increases surface oxidation. Although increasing temperature was shown to increase the extent of carbon corrosion, catalysing the carbon did not significantly change how much carbon was corroded. Platinum stability was investigated by electrochemical metal area loss (ECA). Platinum catalysts on commercial carbons lost more ECA with increasing temperature. A platinum/cobalt alloy on a low surface area carbon was demonstrated to be more stable to both carbon corrosion and metal area loss at temperatures up to 80°C than platinum catalysts on commercial carbons, making this material an excellent candidate for higher temperature automotive operation.