Electrochemical and infrared study of electro-oxidation of dimethyl ether (DME) on platinum polycrystalline electrode in acid solutions
Electrochemical and infrared study of electro-oxidation of dimethyl ether (DME) on platinum polycrystalline electrode in acid solutions
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DOI：
10.1016/j.electacta.2008.01.109
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发表时间：
2008-09
影响因子：
6.6
通讯作者：
Yi Zhang;Leilei Lu;Yujin Tong;M. Osawa;S. Ye
中科院分区：
文献类型：
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作者：
Yi Zhang;Leilei Lu;Yujin Tong;M. Osawa;S. Ye
用电化学和原位红外（IR）测量方法研究了二甲醚（CH3OCH3，下文记为二甲醚）在Pt多晶电极上在酸性溶液中的电氧化反应。在Pt电极表面二甲醚脱氢过程中，在低电位区发现了一种反应中间体（CH3OCH2 -）ad作为初始产物。该物种随后分解为吸附的一氧化碳（CO），最后在高电位区氧化为二氧化碳（CO2）。采用时间分辨红外测量技术跟踪了中间体在Pt电极表面形成和分解的瞬态过程。根据这些电化学和红外光谱结果，提出了二甲醚电氧化工艺的反应方案。
Electro-oxidation of dimethyl ether (CH3OCH3, denoted as DME below) on Pt polycrystalline electrode has been investigated by electrochemical and in situ infrared (IR) measurements in acid solutions. A reaction intermediate species, (CH3OCH2–)ad, has been observed in the low potential region as an initial product for dehydrogenation process of DME on Pt electrode surface. This species is subsequently decomposed to adsorbed carbon monoxide (CO) and finally oxidized to carbon dioxide (CO2) in higher potential region. The time-resolved IR measurement is employed to follow the transient process of the formation and decomposition of the intermediate on Pt electrode surface. Based on these electrochemical and IR spectroscopic results, a reaction scheme for DME electro-oxidation process is proposed.