Tailoring the interfacial microenvironment by electrolyte engineering boosts bicarbonate electrolysis

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL AIChE Journal Pub Date : 2024-08-28 DOI:10.1002/aic.18599

Jiahui Lin, Xuedi Sheng, Wangxin Ge, Lei Dong, Wenfei Zhang, Xiaoling Yang, Jianhua Shen, Hongliang Jiang, Chunzhong Li

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Abstract

Bicarbonate electrolysis, as a carbon utilization technology with high efficiency and potential for industrial applications, provides a promising pathway for CO₂ emission reduction. However, how to inhibit serious hydrogen evolution reaction (HER) and increase the relatively low CO₂ concentration at the electrode-electrolyte interfacial is challenging. Here, we introduce three typical aminopolycarboxylic acids (APCAs) with different amounts of carboxylic acid roots into 3 M KHCO₃ to enhance the Faradaic efficiency of CO (FE_CO) from 51.2% to 68.0% at 100 mA cm⁻². Spectroscopic characterization confirms that the role of APCAs in confining the activity of water dissociation and improving the availability of CO₂. The strategy adopted in this work that introducing APCAs into the electrolyte to balance the content of CO₂ and H₂O for improving the electrocatalytic performance, can serve as a reference for other electrocatalytic systems.

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通过电解质工程定制界面微环境，促进碳酸氢盐电解

碳酸氢盐电解作为一种高效且具有工业应用潜力的碳利用技术，为二氧化碳减排提供了一条前景广阔的途径。然而，如何抑制严重的氢进化反应（HER）并提高电极-电解质界面上相对较低的二氧化碳浓度是一项挑战。在这里，我们在 3 M KHCO3 中引入了三种典型的氨基多羧酸（APCAs），其羧酸根的含量各不相同，从而在 100 mA cm-2 的条件下将 CO 的法拉第效率（FECO）从 51.2% 提高到 68.0%。光谱表征证实了 APCAs 在限制水解离活性和提高 CO2 可用性方面的作用。这项工作中采用的策略，即在电解液中引入 APCAs 以平衡 CO2 和 H2O 的含量，从而提高电催化性能，可为其他电催化系统提供参考。

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.