Study of oxygen adsorption on platinum through observation of exchange current in a solid electrolyte concentration cell
Study of oxygen adsorption on platinum through observation of exchange current in a solid electrolyte concentration cell
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DOI：
10.1016/0013-4686(83)85137-8
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发表时间：
1983-03
影响因子：
6.6
通讯作者：
H. Okamoto;G. Kawamura;T. Kudo
中科院分区：
文献类型：
--
作者：
H. Okamoto;G. Kawamura;T. Kudo
为了研究Pt的氧吸附，在600 ~ 1000 K温度范围内，用参比电极、对电极和工作电极恒电位测量了氧分压（PO 2）为6 × 101 ~ 2 × 104 Pa的固体电解质浓差电池中的交换电流（i 0）。结果表明，σ 0是PO 2的函数，在特定的PO 2处有一个极大值，该极大值取决于温度，在较高的PO 2区域，logi 0系统的斜率约为0.001。0.2而对于较低的PO 2区域，其在0.2和0.6之间。这些结果解释了氧解离吸附在Pt上的电化学反应的双电子机制。根据朗缪尔吸附等温线，Pt的氧吸附热为180 KJ mol-1。
To investigate oxygen adsorption of Pt, the exchange current (i0) in a solid electrolyte concentration cell is measured potentiostatically using a reference, counter, and working electrode with oxygen partial pressure (PO2) ranging from 6 × 101to 2 × 104Pa, at temperatures between 600 and 1000 K. It is found thati0is a function ofPO2with a maximum at a specificPO2which depends on temperature, and the slope of the logi0vslogPO2for a higherPO2region is approx. 0.2 and that for a lowerPO2region is between 0.2 and 0.6. These results are explained in terms of an electrochemical reaction of oxygen dissociatively adsorbed on Ptviaa two-electron mechanism. On the basis of Langmuir's adsorption isotherm, the heat of oxygen adsorption on Pt is determined to be 180 KJ mol−1.