美国莱斯大学Wang Haotian团队报道了在一个电化学固体电解质反应器中的连续碳捕获。相关研究成果发表在2023年6月28日出版的国际知名学术期刊《自然》。

以可再生电力为能源输入的电化学碳捕获技术在碳管理方面很有前景，但仍存在捕获率低、氧敏感性低或系统复杂性的问题。

该文中，研究人员通过将氧/水（O₂/H₂O）氧化还原偶与模块化固体电解质反应器耦合，展示了一种连续的电化学碳捕获设计。通过进行氧还原反应（ORR）和析氧反应（OER）氧化还原电解，该设备可以在高碱性阴极-膜界面有效吸收稀释的二氧化碳（CO₂）分子，形成碳酸盐离子，然后通过来自阳极的质子通量进行中和过程，以从中间固体电解质层连续输出高纯度（>99%）的CO₂流。

在整个碳吸收/释放过程中，不需要化学输入，也不产生副产品。该碳捕获固体电解质反应器中证明了高的碳捕获率（440mAcm^-2、0.137molCO₂min^-1cm^-2或86.7kgCO₂day^-1m^-2）、高法拉第效率（基于碳酸盐计>90%）、模拟烟气中的高碳去除效率（>98%）和低能耗（从150kJ/molCO₂开始），表明了有前景的实际应用。

附：英文原文

Title: Continuous carbon capture in an electrochemical solid-electrolyte reactor

Author: Zhu, Peng, Wu, Zhen-Yu, Elgazzar, Ahmad, Dong, Changxin, Wi, Tae-Ung, Chen, Feng-Yang, Xia, Yang, Feng, Yuge, Shakouri, Mohsen, Kim, Jung Yoon (Timothy), Fang, Zhiwei, Hatton, T. Alan, Wang, Haotian

Issue&Volume: 2023-06-28

Abstract: Electrochemical carbon-capture technologies, with renewable electricity as the energy input, are promising for carbon management but still suffer from low capture rates, oxygen sensitivity or system complexity1,2,3,4,5,6. Here we demonstrate a continuous electrochemical carbon-capture design by coupling oxygen/water (O2/H2O) redox couple with a modular solid-electrolyte reactor7. By performing oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) redox electrolysis, our device can efficiently absorb dilute carbon dioxide (CO2) molecules at the high-alkaline cathode–membrane interface to form carbonate ions, followed by a neutralization process through the proton flux from the anode to continuously output a high-purity (>99%) CO2 stream from the middle solid-electrolyte layer. No chemical inputs were needed nor side products generated during the whole carbon absorption/release process. High carbon-capture rates (440mAcm2, 0.137mmolCO2min1cm2 or 86.7kgCO2day1m2), high Faradaic efficiencies (>90% based on carbonate), high carbon-removal efficiency (>98%) in simulated flue gas and low energy consumption (starting from about 150kJ per molCO2) were demonstrated in our carbon-capture solid-electrolyte reactor, suggesting promising practical applications.

DOI: 10.1038/s41586-023-06060-1

Source: https://www.nature.com/articles/s41586-023-06060-1