Effect of Halide Anions on Electrochemical CO2 Reduction in Non‐Aqueous Choline Solutions using Ag and Au Electrodes

IF 2.5 4区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Hengameh Farahmandazad, Simone Asperti, Ruud Kortlever, Earl Goetheer, Wiebren de Jong
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Abstract

In this study, the effect of halide anions on the selectivity of the CO2 reduction reaction to CO was investigated in choline‐based ethylene glycol solutions containing different halides (ChCl : EG, ChBr : EG, ChI : EG). The CO2RR was studied using silver (Ag) and gold (Au) electrodes in a compact H‐cell. Our findings reveal that chloride effectively suppresses the hydrogen evolution reaction and enhances the selectivity of carbon monoxide production on both Ag and Au electrodes, with relatively high selectivity values of 84 % and 62 %, respectively. Additionally, the effect of varying ethylene glycol content in the choline chloride‐containing electrolyte (ChCl : EG 1 : X, X=2, 3, 4) was investigated to improve the current density during CO2RR on the Ag electrode. We observed that a mole ratio of 1 : 4 exhibited the highest current density with a comparable faradaic efficiency toward CO. Notably, an evident surface reconstruction process took place on the Ag surface in the presence of Cl ions, whereas on Au, this phenomenon was less pronounced. Overall, this study provides new insights into anion‐induced surface restructuring of Ag and Au electrodes during CO2RR, and its consequences on the reduction performance on such surfaces in non‐aqueous electrolytes.

Abstract Image

卤化物阴离子对使用银电极和金电极在非水胆碱溶液中电化学还原 CO2 的影响
在本研究中,研究了在含有不同卤化物(ChCl : EG、ChBr : EG、ChI : EG)的胆碱基乙二醇溶液中,卤化物阴离子对 CO2 还原反应生成 CO 的选择性的影响。在紧凑型 H 型电池中使用银(Ag)和金(Au)电极对 CO2RR 进行了研究。我们的研究结果表明,氯化物能有效抑制氢气进化反应,并提高银电极和金电极产生一氧化碳的选择性,选择性相对较高,分别为 84% 和 62%。此外,我们还研究了氯化胆碱电解液(ChCl : EG 1 : X, X=2, 3, 4)中乙二醇含量的变化对提高银电极上 CO2RR 过程中电流密度的影响。我们观察到,摩尔比为 1 : 4 的电流密度最高,对 CO 的致电效率相当。值得注意的是,在有 Cl- 离子存在的情况下,银表面发生了明显的表面重构过程,而在金表面,这种现象并不明显。总之,这项研究为了解 CO2RR 过程中阴离子诱导的银和金电极表面重构及其对这些表面在非水电解质中的还原性能的影响提供了新的视角。
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来源期刊
ChemistryOpen
ChemistryOpen CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
4.80
自引率
4.30%
发文量
143
审稿时长
1 months
期刊介绍: ChemistryOpen is a multidisciplinary, gold-road open-access, international forum for the publication of outstanding Reviews, Full Papers, and Communications from all areas of chemistry and related fields. It is co-owned by 16 continental European Chemical Societies, who have banded together in the alliance called ChemPubSoc Europe for the purpose of publishing high-quality journals in the field of chemistry and its border disciplines. As some of the governments of the countries represented in ChemPubSoc Europe have strongly recommended that the research conducted with their funding is freely accessible for all readers (Open Access), ChemPubSoc Europe was concerned that no journal for which the ethical standards were monitored by a chemical society was available for such papers. ChemistryOpen fills this gap.
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