数字农科院2.0

Carbon-based mediators for extracellular electron transfer in environmental applications: a review

文献类型： 外文期刊

作者： Side Yang;Xingping Chang;Xiaodong Zhao;Xiaolin Zhang;Kai Wang;Xiaojing Li;Yongtao Li

作者机构：

关键词： Carbon-based mediators;Electrical conductivity;Electron transfer;Environmental effects;Shuttle

期刊名称： Sustainable Energy Technologies and Assessments

ISSN： 2213-1388

年卷期： 2025 年 84 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Microbial extracellular electron transfer (EET) is crucial for elemental biogeochemical cycling and environmental pollution remediation. Introducing carbon-based mediator (CM), which possess higher stability, broader applicability, lower cost, and tunable properties compared with metal oxides or synthetic quinones, has been proven to be an effective strategy to enhance EET. However, due to the inherent complexity of the physicochemical properties and structures of CM, current understanding of mediating EET remains incomplete. In this review, based on the mechanism of direct and indirect electron transfer modes, the research progress of EET mediated by CM, including humus, biochar, carbon nanomaterials, etc., was summarized. The main mechanisms of CM to promote EET involve: (1) as a redox shuttle, CM with excellent redox reversibility can participate in oxidation–reduction reactions by accepting and donating electrons; (2) as electron conduction, CM with graphite-like structures exhibit high electrical conductivity to act as “electronic bridge” facilitating interspecies electron exchange; (3) as microbial stimulation, CM can enhance microbial activity by enriching electroactive microorganisms with the advantage of secreting electron transport chain-related enzymes. Finally, the environmental applications of CM in enhancing EET are comprehensively reviewed, with emphasis on the microbial transformation of organic and inorganic pollutants, greenhouse gas mitigation and energy recovery. The review aims to promote understanding of CM and their related EET applications in environmental management.

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