3D Macroporous Nitrogen-Enriched Graphitic Carbon Scaffold for Efficient Bioelectricity Generation in Microbial Fuel Cells
3D Macroporous Nitrogen-Enriched Graphitic Carbon Scaffold for Efficient Bioelectricity Generation in Microbial Fuel Cells
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3D 大孔富氮石墨碳支架，用于微生物燃料电池中高效生物发电
DOI：
10.1002/aenm.201601364
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发表时间：
2017
影响因子：
27.8
通讯作者：
Ren Nanqi
中科院分区：
文献类型：
--
作者：
You Shijie;Ma Ming;Wang Wei;Qi Dianpeng;Chen Xiaodong;Qu Jiuhui;Ren Nanqi
微生物燃料电池(MFC)可以利用外电素氧化有机化合物来发电，为从有机废水中回收电能提供了广阔的前景。负极材料的结构和性能对细胞外电子转移(EET)有着内在的影响，EET是一种界面过程，极大地限制了MFC的生物电生产。本文以市售的三聚氰胺泡沫为原料，采用简易热解法制备了三维大孔富氮碳(NGC)支架。结果表明，该电极能有效地促进电化学反应，以纯培养的圆锥希瓦氏菌MR-1为基础，在醋酸盐饲喂的微生物燃料电池中达到了750mWm−2的功率密度。独特的三维开孔结构不仅为电活性生物膜提供了最大密度的定植栖息地，而且还为内部传质提供了大孔结构，而不考虑生物堵塞和生物污染。此外，氮的掺入对提高EET也有重要作用，密度泛函理论计算表明，吡咯氮的活性远高于石墨氮和吡啶氮。这项工作为用于发电、制氢和污染物降解的生物电化学系统提供了一种高效、经济、易于放大和环境友好的负极材料的概念验证。
Microbial fuel cell (MFC) can generate electricity based on oxidation of organic compounds by exoelectogens, giving rise to a promising potential for recovering electrical energy from organic wastewater. The structure and property of anode materials have inherent impact to extracellular electron transfer (EET), an interfacial process that greatly limits bioelectricity production of MFC. Herein, a three dimensional (3D) macroporous nitrogen-enriched graphitic carbon (NGC) scaffold is fabricated from commercially available melamine foam using facile pyrolysis method. The NGC electrode is demonstrated to promote EET efficiently, achieving a power density of 750 mW m− 2 based on pure cultured Shewanella oneidensis MR-1 in acetate-feeding MFC. The unique 3D open-cell structure not only offers habitats for colonization of electroactive biofilm up to a maximal density but also provides macroporous architecture for internal mass transfer without concern of bio-blocking and bio-fouling. Additionally, nitrogen incorporation also plays a significant role in enhancing EET, where pyrrolic nitrogen is much more active than graphitic and pyridinic nitrogen as indicated by density functional theory calculation. This work provides a proof-of-concept demonstration of a high-efficiency, cost-effective, easily scaling-up, and environmentally friendly anode material of bioelectrochemical systems for electricity generation, hydrogen production, and pollutant degradation.