Upgrading CO2 into acetate on Bi2O3@carbon felt integrated electrode via coupling electrocatalysis with microbial synthesis. Issue 2 (17th March 2023)

• Record Type: Journal Article
• Authors: Liu, Xiaojing; Zhang, Kang; Sun, Yidan; Zhang, Shukang; Qiu, Zhenyu; Song, Tianshun; Xie, Jingjing; Wu, Yuping; Chen, Yuhui
• Is Part Of: SusMat. Volume 3:Issue 2(2023)
• Page Start: 235
• Page End: 247
• Publication Date: 2023-03-17
• Subjects: acetate -- Bi2O3@CF -- CO2 conversion -- electrocatalysis–microbial synthesis -- formate; Sustainable engineering -- Periodicals; Materials -- Environmental aspects -- Periodicals; Clean energy -- Periodicals; Refuse and refuse disposal -- Periodicals; 620.1
• DOI: 10.1002/sus2.117
• Languages: English
• ISSNs: 2692-4552

Abstract

Abstract: Upgrading of atmospheric CO2 into high‐value‐added acetate using renewable electricity via electrocatalysis solely remains a great challenge. Here, inspired by microbial synthesis via biocatalysts, we present a coupled system to produce acetate from CO2 by bridging inorganic electrocatalysis with microbial synthesis through formate intermediates. A 3D Bi2 O3 @CF integrated electrode with an ice‐sugar gourd shape was fabricated via a straightforward hydrothermal synthesis strategy, wherein Bi2 O3 microspheres were decorated on carbon fibers. This ice‐sugar gourd‐shaped architecture endows electrodes with multiple structural advantages, including synergistic contribution, high mass transport capability, high structural stability, and large surface area. Consequently, the resultant Bi2 O3 @CF exhibited a maximum Faradic efficiency of 92.4% at −1.23 V versus Ag/AgCl for formate generation in 0.5 M KHCO3, exceeding that of Bi2 O3 /CF prepared using a conventional electrode preparation strategy. Benefiting from the high formate selectivity, unique architecture, and good biocompatibility, the Bi2 O3 @CF electrode attached with enriched CO2 ‐fixing electroautotrophs served as a biocathode. As a result, a considerable acetate yield rate of 0.269 ± 0.009 g L −1 day −1 (a total acetate yield of 3.77 ± 0.12 g L −1 during 14‐day operation) was achieved in the electrochemical–microbial system equipped with Bi2 O3 @CF. Abstract : Ice‐sugar gourd‐shaped Bi2 O3 @carbon felt integrated electrode prepared via a hydrothermal straightforward strategy has been demonstrated as an efficient electrocatalyst for electrochemical CO2 reduction to formate. By employing Bi2 O3 @carbon felt as an electrocatalyst and enriched CO2 ‐fixing acetogen community as biocatalyst, the electrochemical–microbial synthesis coupled system delivers a considerable acetate yield.