Detweiler Zachary M, White James L, Bernasek Steven L, Bocarsly Andrew B
Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States.
Langmuir. 2014 Jul 1;30(25):7593-600. doi: 10.1021/la501245p. Epub 2014 Jun 18.
The interactions of CO2 with indium metal electrodes have been characterized for electrochemical formate production. The electrode oxidation state, morphology, and voltammetric behaviors were systematically probed. It was found that an anodized indium electrode stabilized formate production over time compared to etched indium electrodes and indium electrodes bearing a native oxide in applied potential range of -1.4 to -1.8 V vs SCE. In addition, it was observed that formate is the major product at unprecedentedly low overpotentials at the anodized surface. A surface hydroxide species was observed suggesting a mechanism of formate production that involves insertion of CO2 at the indium interface to form an electroactive surface bicarbonate species.
已对二氧化碳与铟金属电极的相互作用进行了表征，以用于电化学制甲酸盐。系统地探究了电极的氧化态、形态和伏安行为。结果发现，在相对于饱和甘汞电极（SCE）为-1.4至-1.8V的外加电势范围内，与蚀刻铟电极和带有天然氧化物的铟电极相比，阳极氧化铟电极随时间推移能稳定甲酸盐的生成。此外，观察到在阳极氧化表面，甲酸盐是在前所未有的低过电势下的主要产物。观察到一种表面氢氧化物物种，这表明甲酸盐生成的一种机制，即二氧化碳在铟界面处插入形成一种电活性表面碳酸氢盐物种。
