On-Line Mass Spectrometry for Ethanol Oxidation on Well-Defined Sn/Pt(hkl) Electrode Surfaces
On-Line Mass Spectrometry for Ethanol Oxidation on Well-Defined Sn/Pt(hkl) Electrode Surfaces
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精细定义的 Sn/Pt(hkl) 电极表面乙醇氧化的在线质谱分析
DOI：
10.1149/07514.1029ecst
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
T. Wadayama
中科院分区：
文献类型：
--
作者：
H. Nakamura;T. Inoue;T. Matsuda;N. Todoroki;T. Wadayama
研究了乙醇氧化反应(EOR)的起始电位和电极表面气态产物随电位变化的过程。在超高真空条件下，在铂(HKl)单晶衬底上真空镀锡制备了电极表面。与未修饰的铂(Hk1)相比，锡/铂(Hk1)阳极电流的提高采收率起始电位向低电位移动。在线电化学质谱(OLEMS)分析表明，在较低的外加电压下，生成的是乙醛，而不是CO2，产物的演化对铂表面的原子排列很敏感。提高采收率的阳极电流测量和OLEMS分析表明，锡/铂的提高采收率起始电位最低(110)。这一发现可以归因于在乙醇CC键断裂过程中铂(110)步骤的有效性，以及铂和锡原子对抗CO中毒的整体效应。
Onset potentials of ethanol oxidation reaction (EOR) and potentialdependent evolution of gaseous products from well-defined Sn/Pt (hkl) electrode surfaces were investigated. The electrode surfaces were prepared by vacuum deposition of Sn on a Pt (hkl) single-crystal substrate in ultra-high vacuum. The EOR onset potentials of anodic currents for Sn/Pt (hkl) shifted to lower potentials in comparison to unmodified Pt (hkl). Online electrochemical mass spectrometry (OLEMS) analysis of the gaseous products formed on the Sn/Pt (hkl) surfaces showed that acetaldehyde, rather than CO2, was generated at lower applied voltages and that the product evolution was sensitive to the atomic arrangement of the surface Pt (Pt (hkl)). EOR anodic current measurements and OLEMS analysis showed that EOR onset potential is the lowest for Sn/Pt (110). The findings can be attributed to the effectiveness of Pt (110) steps in ethanol CC bond cleavage and an ensemble effect of the Pt and Sn atoms against CO poisoning.