High efficiency microbial electrosynthesis of acetate from carbon dioxide using a novel graphene–nickel foam as cathode

Journal of Chemical Technology and Biotechnology - Tập 93 Số 2 - Trang 457-466 - 2018
Tian‐shun Song1,2,3, Kangqing Fei1,3, Hongkun Zhang1,3, Hao Yuan2, Yang Yang2, Pingkai Ouyang1,4,3, Jingjing Xie1,2,4,3
1College of Life Science and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, PR China
2Jiangsu Branch of China Academy of Science & Technology Development Nanjing PR China
3State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, PR China
4Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing, PR China

Tóm tắt

AbstractBACKGROUNDMicrobial electrosynthesis (MES) is a biocathode‐driven process, producing high‐value chemicals, from CO2. However, the low efficiency of the biocathode hinders the MES process efficiency significantly.RESULTSA novel 3D graphene–nickel foam (G‐NF) cathode has been fabricated, by hydrothermal approach for the improvement of microbially‐catalyzed reduction at the MES cathode. An increase of 1.8 times in the volumetric acetate production rate was obtained, compared with the untreated nickel foam. In MES with G‐NF, a volumetric acetate production rate of 3.11 mmol L‐1 day‐1 has been achieved; 70% of the electrons consumed were recovered and the final acetate concentration reached 5.46 g L‐1 within 28 days.CONCLUSIONThe hierarchical porous G‐NF cathode improved bacterial colonization and the efficiency of mass, nutrients and protons transfer due to its 3D composition; the graphene coating considerably increased the effective surface area for microbial adhesion, as well as the electron transfer rate of biofilm in the MES. This study attempted to improve the efficiency of the biocathode, and provides a promising large electrode for large‐scale MES devices. © 2017 Society of Chemical Industry

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Journal of Chemical Technology and Biotechnology

Tập 93 Số 2

457-466

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