Biobased Chemistry and Technology, Wageningen University & Research, Bornse Weilanden 9, 6708 WG, Wageningen, The Netherlands.
Environmental Technology, Wageningen University & Research, Bornse Weilanden 9, 6708 WG, Wageningen, The Netherlands.
Chempluschem. 2021 May;86(5):763-777. doi: 10.1002/cplu.202100119.
Electrocatalytic metals and microorganisms can be combined for CO conversion in microbial electrosynthesis (MES). However, a systematic investigation on the nature of interactions between metals and MES is still lacking. To investigate this nature, we integrated a copper electrocatalyst, converting CO to formate, with microorganisms, converting CO to acetate. A co-catalytic (i. e. metabolic) relationship was evident, as up to 140 mg L of formate was produced solely by copper oxide, while formate was also evidently produced by copper and consumed by microorganisms producing acetate. Due to non-metabolic interactions, current density decreased by over 4 times, though acetate yield increased by 3.3 times. Despite the antimicrobial role of copper, biofilm formation was possible on a pure copper surface. Overall, we show for the first time that a CO -reducing copper electrocatalyst can be combined with MES under biological conditions, resulting in metabolic and non-metabolic interactions.
电催化金属和微生物可结合用于微生物电合成 (MES) 中的 CO 转化。然而，对于金属与 MES 之间相互作用的本质，仍缺乏系统的研究。为了研究这种本质，我们将将一种将 CO 转化为甲酸盐的铜电催化剂与将 CO 转化为乙酸盐的微生物结合在一起。存在协同催化（即代谢）关系，因为高达 140mg/L 的甲酸盐仅由氧化铜产生，而甲酸盐显然也是由铜产生并被产生乙酸盐的微生物消耗。由于非代谢相互作用，尽管乙酸盐的产率增加了 3.3 倍，但电流密度下降了超过 4 倍。尽管铜具有抗菌作用，但在纯铜表面仍可形成生物膜。总的来说，我们首次表明，在生物条件下，一种 CO 还原铜电催化剂可与 MES 结合，从而产生代谢和非代谢相互作用。
