State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 211816, PR China; College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, PR China.
Nanjing International School, Nanjing 210023, PR China.
Chemosphere. 2024 Jun;358:142157. doi: 10.1016/j.chemosphere.2024.142157. Epub 2024 Apr 26.
Microbial electrosynthesis (MES) is an electrically driven technology that can be used for converting CO/CO into chemicals. The unique electronic and substrate properties of CO make it an important research target for MES. However, CO can poison the cathode and increase the overpotential of hydrogen evolution reaction (HER), thus reducing the electron transfer rate via H. This work evaluated the effect of an anti-CO HER catalyst on the performance of MES for CO/CO conversion. ZnMo-metal-organic framework (MOF) materials with different calcination temperatures were synthesized. ZnMo-MOF-800 with MoC nanoparticles as active centers exhibited excellent resistance to CO toxicity. It also obtained the highest hydrogen evolution and enhanced electron transfer rate in CO atmosphere. MES with ZnMo-MOF-800 cathode and Clostridium ljungdahlii as biocatalyst obtained 0.31 g L d acetate yield, 0.1 g L d butyrate yield, and 0.09 g L d 2,3-butanediol yield in CO/CO, while Pt/C only get 0.076 g L d acetate yield, 0.05 g L d butyrate yield and 0.02 g L d 2,3-butanediol yield. ZnMo-MOF-800 was conducive to biofilm formation, enabling it to better resist CO toxicity. This work provides new opportunities for constructing a highly efficient cathode with an anti-CO hydrogen evolution catalyst to enhance CO/CO conversion in MES.
微生物电合成（MES）是一种电驱动技术，可用于将 CO/CO 转化为化学物质。CO 的独特电子和基质性质使其成为 MES 的重要研究目标。然而，CO 会使阴极中毒并增加析氢反应（HER）的过电势，从而降低通过 H 的电子转移速率。本工作评估了抗 CO HER 催化剂对 CO/CO 转化的 MES 性能的影响。合成了不同煅烧温度的 ZnMo-金属有机骨架（MOF）材料。具有 MoC 纳米颗粒作为活性中心的 ZnMo-MOF-800 表现出优异的抗 CO 毒性。它还在 CO 气氛中获得了最高的析氢和增强的电子转移速率。具有 ZnMo-MOF-800 阴极和 Clostridium ljungdahlii 作为生物催化剂的 MES 获得了 0.31 g·L-1 d-1 的乙酸产量、0.1 g·L-1 d-1 的丁酸产量和 0.09 g·L-1 d-1 的 2,3-丁二醇产量，而 Pt/C 仅获得 0.076 g·L-1 d-1 的乙酸产量、0.05 g·L-1 d-1 的丁酸产量和 0.02 g·L-1 d-1 的 2,3-丁二醇产量。ZnMo-MOF-800 有利于生物膜的形成，使其能够更好地抵抗 CO 毒性。这项工作为构建具有抗 CO 析氢催化剂的高效阴极提供了新的机会，以增强 MES 中的 CO/CO 转化。
