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导电和电容网络用于丰富外电原体,并增强微生物燃料电池中的细胞外电子转移

Xusen Cheng¹, Yunfeng Qiu², Yanxia Wang³

¹College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin 150040, China.

Journal of colloid and interface science

|March 13, 2024

概括

这项研究开发了一个3D导电和电容阳极,使用FeMn化物/氧化物在微生物燃料电池 (MFC) 的粘膜髓网络上. 这增强了外电素附着和细胞外电子转移 (EET),显著提高了MFC性能和废水处理.

科学领域:

电化学电化学电化学
环境科学环境科学
材料科学材料科学材料科学

背景情况:

微生物燃料电池 (MFC) 的性能受到阳极设计的限制,特别是缺乏适合的三维 (3D) 导电和电容网络,用于细菌附着和细胞外电子转移 (EET).
现有的纳米材料改性阳极往往无法提供必要的3D结构,阻碍了有效的微生物殖民和电子转移.

研究的目的:

设计一种新的阳极材料,将3D导电网络与电容性质集成在一起,以克服当前MFC阳极的局限性.
增强细菌附着,大规模运输和EET,以提高MFC发电和废水处理效率.

主要方法:

使用在碳布 (CC) 上生长的粘液菌制造3D导电网络.
电化学沉积电容FeMn化物/氧化物到3D粘膜髓/碳布结构 (FeMn/CMM@CC) 上.
描述FeMn/CMM@CC阳极的特性,并评估其在MFC中的性能,包括功率密度,库伦比效率和化学氧需求 (COD) 消除.

主要成果:

FeMn/CMM@CC阳极展示了一个分布良好的多价金属活性位点网络,促进外电素丰富,促进大规模运输和EET.
与光CC相比,FeMn/CMM@CC阳极实现了显著更高的累积电荷 (131.4 C/m2).
使用FeMn/CMM@CC阳极的MFC显示功率密度为3.06W/m2和库伦比效率为29.9%,大大超过裸CC阳极 (1.29W/m2,7.3%).
FeMn/CMM@CC阳极导致了素分泌量增加和纳米导管的形成,Geobacter的丰度显著增加,从63%增加到83%.
通过FeMn/CMM@CC阳极实现了92.6 mg/L/d的增强的每日COD去除.

结论:

开发的3D导电和电容FeMn/CMM@CC阳极有效优化了MFC中的非生物-生物接口.
这种新阳极设计为提高MFC性能提供了一个有希望的策略,既用于能源发电,也用于废水处理.
简单的方法提供了一个可扩展的方法,用于为生物电化学系统创建先进的宏多孔电极.

关键词:

3D导电网络的3D导电网络容量阳极是一种容量阳极.细胞丰富细胞丰富细胞外电子转移细胞外电子转移微生物燃料电池是一种微生物燃料电池.

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