Electrocatalytic reduction of carbon dioxide on indium coated gas diffusion electrodes-Comparison with indium foil
Electrocatalytic reduction of carbon dioxide on indium coated gas diffusion electrodes-Comparison with indium foil
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DOI：
10.1016/j.apcatb.2016.02.041
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发表时间：
2016-07-15
影响因子：
22.1
通讯作者：
Pasquier, David
中科院分区：
文献类型：
--
作者：
Bitar, Ziad;Fecant, Antoine;Pasquier, David
已知在金属电极上将二氧化碳电催化还原成甲酸存在低电流密度和电解质杂质的快速表面污染。气体扩散电极（GDE）由于其高的比表面积而可以克服这些问题。在这项工作中，我们展示了一种简单的方法来制备铟涂层气体扩散电极（GDE-In/C）和它们的物理和电化学表征。选择铟是因为其与其他金属相比在相对低的过电位下将CO2还原为甲酸的能力。使用相同的操作条件将GDE-In/C的催化性能与铟箔进行比较。在相对于Ag/AgCl为-1.65 V的均匀水性介质（溶解的CO2）中电解期间，GDE-In/C上朝向HCOOH的分电流密度比铟箔上高7倍，法拉第效率为45%。当通过GDE-In/C施加连续流量的CO2气体时，甲酸的产量增加15%。此外，GDE-In/C显示出良好的耐电解质杂质性，并允许实现更高的电流密度。这些令人鼓舞的结果是一个关键的里程碑，在气相CO2电还原的零间隙电池的发展。(C)© 2016 Elsevier B. V.版权所有。
The electrocatalytic reduction of carbon dioxide to formic acid on metallic electrodes is known to suffer from low current density and rapid surface contamination by electrolyte impurities. Gas diffusion electrodes (GDE) can overcome these problems due to their high specific surface area. In this work, we show a simple method to prepare indium coated gas diffusion electrodes (GDE-In/C) and their physical and electrochemical characterization. Indium is chosen for its ability to reduce CO2 to formic acid at relatively low overpotential compared to other metals. The catalytic performance of the GDE-In/C is compared to an indium foil using identical operating conditions. During electrolysis in homogeneous aqueous media (dissolved CO2) at -1.65 V vs. Ag/AgCl, the partial current density toward HCOOH on the GDE-In/C is 7 times higher than on the indium foil with a faradaic efficiency of 45%. The production of formic acid increases by 15% when a continuous flux of CO2 gas is applied through the GDE-In/C. In addition, the GDE-In/C shows a good resistance to electrolyte impurities and allows to achieve higher current densities. These promising results are a key milestone in the development of a zero gap cell for gas phase CO2 electroreduction. (C) 2016 Elsevier B.V. All rights reserved.