Boutin Etienne, Haussener Sophia
Laboratory of Renewable Energy Science and Engineering, École Polytechnique Fédérale de Lausanne, Station 9, 1015 Lausanne, Switzerland.
ACS Catal. 2024 May 15;14(11):8437-8445. doi: 10.1021/acscatal.4c00192. eCollection 2024 Jun 7.
Silver is one of the most studied electrode materials for the electrochemical reduction of carbon dioxide into carbon monoxide, a product with many industrial applications. There is a growing number of reports in which silver is implemented in gas diffusion electrodes as part of a large-scale device to develop commercially relevant technology. Electrochemical models are expected to guide the design and operation toward cost-efficient devices. Despite decades of investigations, there are still uncertainties in the way this reaction should be modeled due to the absence of scientific consensus regarding the reaction mechanism and the nature of the rate-determining step. We review previously reported studies to draw converging conclusions on the value of the Tafel slope and existing species at the electrode surface. We also list conflicting experimental observations and provide leads to tackling these remaining questions.
银是将二氧化碳电化学还原为一氧化碳的研究最多的电极材料之一，一氧化碳是一种具有许多工业应用的产物。越来越多的报告表明，银被应用于气体扩散电极中，作为大规模装置的一部分，以开发具有商业相关性的技术。电化学模型有望指导设计和操作，以实现具有成本效益的装置。尽管经过了数十年的研究，但由于在反应机理和速率决定步骤的性质方面缺乏科学共识，该反应的建模方式仍存在不确定性。我们回顾了先前报道的研究，以就塔菲尔斜率的值和电极表面的现有物种得出一致结论。我们还列出了相互矛盾的实验观察结果，并提供了解决这些遗留问题的线索。
