Mixed potential response for hydrocarbons in a proton-conductive electrochemical cell operated at room temperature
Mixed potential response for hydrocarbons in a proton-conductive electrochemical cell operated at room temperature
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室温下运行的质子传导电化学电池中碳氢化合物的混合电位响应
DOI：
10.1149/2.054405jes
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发表时间：
2014
影响因子：
3.9
通讯作者：
Kazuyo Kobayashi
中科院分区：
文献类型：
--
作者：
Takashi Hibino;Kazuyo Kobayashi
以质子导电的Sn0.9In0.1P2O7为电解质，研究了室温下各种碳氢化合物的混合电位响应。在所测试的电极中，Pt/C在1000 ppm丙烯、10%氧气和约100%氧气的进料混合物中表现出最负的电势。3%的水蒸气。在电极中加入Sn0.9In0.1P2O7后，电极电位进一步向负值移动.在1000 ppm丙烯下，相对于空气电极的所得电势达到-78 mV，这与从能斯特方程计算的结果有显著偏差。这种非能斯特电位也成为增强的浓度和碳数的烃的增加，与CC键不饱和，并与支链结构。这些增强效应可以用烃和氧的极化曲线来解释，其中烃氧化生成CO2和氧还原生成水蒸气是相互竞争的。应该强调的是，烃与氧的非均相催化反应没有发生在电极上，这不仅允许简单的混合电势理论，而且允许电势性质独立于供应气体流速。
The mixed potential response for various hydrocarbons at room temperature was investigated using proton-conductive Sn 0.9 In 0.1 P 2 O 7 as an electrolyte. Among the tested electrodes, Pt/C exhibited the most negative potential in a feed mixture of 1000 ppm propene, 10% oxygen, and ca. 3% water vapor. The potential of this electrode was further shifted to a more negative value by the addition of Sn 0.9 In 0.1 P 2 O 7 to the electrode. The resultant potential vs. an air electrode reached− 78 mV at 1000 ppm propene, which is a significant deviation from that calculated from the Nernst equation. This non-Nernstian potential also became enhanced as the concentration and carbon number of the hydrocarbon increased, with the CC linkage unsaturated, and with a branched chain structure. These enhancement effects could be explained by the polarization curves for hydrocarbon and oxygen, where CO 2 formation through hydrocarbon oxidation and water vapor formation through oxygen reduction were in competition with each other. It should be emphasized that the heterogeneous catalytic reaction of the hydrocarbon with oxygen did not occur over the electrode, which allowed not only for a simple mixed potential theory, but also for the potential properties to be independent of the supply gas flow rate.