Enhanced Supply of Hydroxyl Species in CeO2-Modified Platinum Catalyst Studied by in Situ ATR-FTIR Spectroscopy
Enhanced Supply of Hydroxyl Species in CeO2-Modified Platinum Catalyst Studied by in Situ ATR-FTIR Spectroscopy
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DOI：
10.1021/acscatal.6b00108
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发表时间：
2016-02
期刊：
影响因子：
12.9
通讯作者：
Y. Katayama;T. Okanishi;H. Muroyama;T. Matsui;K. Eguchi
中科院分区：
文献类型：
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作者：
Y. Katayama;T. Okanishi;H. Muroyama;T. Matsui;K. Eguchi
近年来，阴离子交换膜（AEM）的发展极大地提高了阴离子交换膜燃料电池（AEMFC）的性能。虽然通过将最重要的放在燃料物质上，已经成功地开发了用于特定反应的高活性电催化剂，但是只有少数研究集中在OHad（羟基吸附物质）上，OHad已知是碱性环境中的常见反应性物质。在这项研究中，高度亲氧CeO2被选为Pt电极的表面改性剂。我们首先应用原位衰减全反射傅里叶变换红外（ATR-FTIR）光谱的离聚物涂覆的Pt和CeO2改性的Pt表面澄清OHad的吸附行为。结果表明，在空白KOH溶液中，OHad的吸附行为发生了明显的变化。这些特性适用于各种电化学氧化反应。在氨氧化反应过程中，铈催化剂促进了NOad物种的形成。
The recent development of anion exchange membranes (AEMs) has increased the potential of anion exchange membrane fuel cells (AEMFCs). Although highly active electrocatalysts for specific reactions have been successfully developed by placing the most importance on the fuel species, only a few studies have focused on OHad (hydroxyl adsorbed species), which is known to be a common reactive species in alkaline environments. In this study, highly oxophilic CeO2 was selected as a surface modifier for a Pt electrode. We first applied in situ attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy to ionomer-coated Pt and CeO2-modified Pt surfaces for clarifying the adsorption behavior of OHad. As a result, a distinct change in adsorption behavior of OHad was confirmed in blank KOH solution. These peculiar characteristics were applicable to various electrochemical oxidation reactions. During the ammonia oxidation reaction, the acceleration of the formation of NOad species was observed in Ce...