Microbial electrochemical technologies (METs) are promising for sustainable applications. Recently, electron storage during intermittent operation of electroactive biofilms (EABs) has been shown to play an important role in power output and electron efficiencies. Insights into electron storage mechanisms, and the conditions under which these occur, are essential to improve microbial electrochemical conversions and to optimize biotechnological processes. Here, we discuss the two main mechanisms for electron storage in EABs: storage in the form of reduced redox active components in the electron transport chain and in the form of polymers. We review electron storage in EABs and in other microorganisms and will discuss how the mechanisms of electron storage can be influenced.

微生物电化学技术 (MET) 有望用于可持续应用。最近，电活性生物膜 (EAB) 间歇操作期间的电子存储已被证明在功率输出和电子效率方面发挥着重要作用。深入了解电子存储机制及其发生的条件对于改善微生物电化学转化和优化生物技术过程至关重要。在这里，我们讨论了 EAB 中电子存储的两种主要机制：以电子传输链中还原氧化还原活性成分的形式和以聚合物的形式存储。我们回顾了 EAB 和其他微生物中的电子存储，并将讨论如何影响电子存储的机制。