Upgrading CO 2 into acetate on Bi 2 O 3 @carbon felt integrated electrode via coupling electrocatalysis with microbial synthesis

SusMat

article

Yidan Sun¹  Shukang Zhang¹  Zhenyu Qiu¹  Tianshun Song¹  Jingjing Xie¹  Yuping Wu¹  Yuhui Chen¹  Xiaojing Liu¹  Kang Zhang¹ 

[1] State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University;College of Chemical Engineering, Nanjing Tech University;School of Energy Science and Engineering, Nanjing Tech University;College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University

关键词: acetate;    Bi2O3@CF;    CO2 conversion;    electrocatalysis–microbial synthesis;    formate;   

DOI  :  10.1002/sus2.117

学科分类：电力

来源: Wiley

【 摘 要 】

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 Bi2O3@CF integrated electrode with an ice-sugar gourd shape was fabricated via a straightforward hydrothermal synthesis strategy, wherein Bi2O3 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 Bi2O3@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 Bi2O3/CF prepared using a conventional electrode preparation strategy. Benefiting from the high formate selectivity, unique architecture, and good biocompatibility, the Bi2O3@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 Bi2O3@CF.

【 授权许可】

CC BY