Abstract:

Electrochemical reduction of CO₂ to value-added fuels by renewable clean energy is an effective way to achieve energy storage, carbon emission reduction and carbon neutrality. However, due to the low solubility of reactant CO₂ in aqueous electrolytes, limitations in mass transfer processes seriously hinder the electrocatalytic reaction to meet the requirements for achieving industrial operation. To resolve this problem, the self-supported porous electrodes attract much attention. This paper first introduced the research progress of self-supported porous electrodes and illustrated the latest results of CO₂ electroreduction from new self-supported porous hollow fiber gas penetrating electrodes in our research group. Considering the continuous and ample CO₂ feeding realized nearby active sites on this electrode structure, a new technology model perspective of enhanced interface reaction and oriented mass transfer by gas penetration electrodes was put forward, which can become a new technology route to prepare self-supported porous electrodes and would exert significant implications for the industrialization of electrocatalytic CO₂ reduction.

Key words: carbon dioxide, self-supported porous electrode, electrocatalysis, oriented mass transfer, hollow fiber

摘要：

利用可再生能源将二氧化碳（CO₂）电催化转化成高附加值燃料，是实现能源储存、碳减排及碳中和的有效途径。然而由于CO₂分子在水相电解质中的溶解度低，这一传质限制严重阻碍了电催化反应的工业化进程。为了攻克这一技术瓶颈，多孔自支撑电极因其独特的优势而日益受到科研界的瞩目。本文首先介绍了多孔结构自支撑电极的研究进展，并进一步阐释了本文作者课题组关于新型多孔自支撑结构——中空纤维气体透散电极的最新研究成果。结合该电极结构能够实现在活性位点处反应物分子CO₂连续充足供给的优势，提出了利用气体透散电极来增强三相界面反应并促进定向传质的概念。这一策略有望成为制备多孔自支撑电极的新型技术路线，对推进电催化还原CO₂工业化进程具有重要意义。

关键词: 二氧化碳, 多孔自支撑电极, 电催化, 定向传质, 中空纤维