Cyclic Voltammetry is Invasive on Microbial Electrosynthesis,ChemElectroChem

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Cyclic Voltammetry is Invasive on Microbial Electrosynthesis
ChemElectroChem ( IF 3.5 ) Pub Date : 2021-08-19 , DOI: 10.1002/celc.202100914
Sanne M. de Smit ₁ , david strik ₂ , Johannes H. Bitter ₃ , Cees J.N. Buisman ₄

Affiliation

Cyclic voltammetry (CV) is expected to cause changes in the biocathode composition, especially when using low scan rates. A recent finding stated that CV triggered further biocatalytic activity in microbial electrosynthesis systems (MES), leading to the aim of our study: to investigate the invasiveness of CV on MES. The present study confirms that a CO₂ elongation MES biocathode composition changes during and right after the CV. Oxidation peaks differ over repeated CV-cycles while metal compounds and biomass were released in the biocatholyte. After CV, the current increased temporarily for up to 20 days and the metal compounds decreased from the biocatholyte solution. Further, the sole short application of open cell voltage was shown to shortly increase the current. Evidently CV affects the studied biocathode, which complicates the use of CV as an analysis technique in MESs. However, the positive effect CV has on biocathode current density may provide methods to boost reactor performance and maintain productivity.

中文翻译：

循环伏安法对微生物电合成有影响

循环伏安法 (CV) 预计会导致生物阴极成分发生变化，尤其是在使用低扫描速率时。最近的一项发现表明，CV 在微生物电合成系统 (MES) 中触发了进一步的生物催化活性，从而导致我们研究的目的：研究 CV 对 MES 的侵袭性。本研究证实，CO ₂伸长率 MES 生物阴极组成在 CV 期间和之后发生变化。氧化峰在重复的 CV 循环中不同，而金属化合物和生物质在生物阴极电解液中释放。在 CV 之后，电流暂时增加长达 20 天，并且金属化合物从生物阴极电解液溶液中减少。此外，显示开路电池电压的唯一短路应用会很快增加电流。显然，CV 会影响所研究的生物阴极，这使 CV 在 MES 中用作分析技术变得复杂。然而，CV 对生物阴极电流密度的积极影响可以提供提高反应器性能和保持生产力的方法。

更新日期：2021-09-03

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