数字农科院2.0

Controllable fabrication of hierarchical porous anode for exoelectrogens internal colonization in microbial electrochemical system

文献类型： 外文期刊

作者： Yujie Zhu;Dandan Liang;Ruize Gu;Shujuan Liu;Pinpin Yang;Lijuan Zhang;Weihua He;Yujie Feng

作者机构：

关键词： Bioaccessible surface area;Hierarchical porous anode;Microbial electrochemical system;Microbial internal colonization;Millimeter-level pore structure;Sacrificial template method

期刊名称： Bioresource Technology

ISSN： 0960-8524

年卷期： 2025 年 426 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Efficient interfacial energy conversion and rapid charge transfer are crucial for application-oriented microbial electrochemical systems (MES) and depend on affordable high-performance anodes. Herein, hierarchically porous 3D anodes with controlled millimeter-scale macropores (1–2 mm) were fabricated via carbonization of phenolic foam embedded with expanded polystyrene (EPS) sacrificial templates. Optimizing EPS loading (4 wt%) and pore-sizes yielded anode L-4M, exhibiting appropriate hydrophilicity (contact angle: 60.0 ± 0.7°) and enhanced electrochemically active surface area (ECSA: 61 cm2) attributed to surface oxygen-containing groups and multiscale porosity. The L-4M achieved a remarkable maximum power density of 3800 ± 80 mW m−2, 2.1-fold higher than carbon-cloth anodes. Engineered macropores facilitated unprecedented microbial colonization depth (≥ 2.5 mm) and biomass density (1300 ± 36 μg cm−2) predominated by Geobacter sp. (75 % relative abundance). This millimeter-scale pore engineering strategy enhanced bio-accessible surface area, substrate diffusion, and electroactive biofilm development, offering a scalable approach for high-current–density MES.

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