论文标题
二苯基硅氧烷对PT催化活性对碳的影响
Effect of Di-phenyl Siloxane on the Catalytic Activity of Pt on Carbon
论文作者
论文摘要
使用二苯基硅氧烷作为旋转圆盘电极（RDE）的源化合物研究了有机硅对PT催化活性对氧还原和氢吸附的影响。将二苯基硅氧烷注射到电解质中时不会影响PT的催化活性。然而，当用催化剂预混合时，它阻止了氧还原反应。在任何一种情况下，质子运输均未阻塞。我们假设二苯基硅氧烷会诱导疏水性并引起局部水饥饿，从而阻断氧气的转运。因此，燃料电池中有机硅密封件的缓慢浸出可能会导致电极中的硅积聚，这将通过阻止氧气传输到催化剂位点而不可逆转地降低燃料电池的性能。
The effect of silicone on the catalytic activity of Pt for oxygen reduction and hydrogen adsorption was studied using di-phenyl siloxane as a source compound at a rotating disc electrode (RDE). Di-phenyl siloxane did not affect the catalytic activity of Pt when it was injected into the electrolyte. However, it blocked the oxygen reduction reaction when it was premixed with the catalyst. Proton transport was not blocked in either case. We postulate that di-phenyl siloxane induces hydrophobicity and causes local water starvation thereby blocking oxygen transport. Hence, the slow leaching of silicone seals in a fuel cell could cause silicon accumulation in the electrode, which will irreversibly degrade fuel cell performance by blocking oxygen transport to the catalyst sites.
