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Increased power generation in supercapacitive microbial fuel cell stack using FeNC cathode catalyst
Journal of Power Sources ( IF 9.2 ) Pub Date : 2018-11-30 , DOI: 10.1016/j.jpowsour.2018.11.069
Carlo Santoro , Mounika Kodali , Najeeb Shamoon , Alexey Serov , Francesca Soavi , Irene Merino-Jimenez , Iwona Gajda , John Greenman , Ioannis Ieropoulos , Plamen Atanassov

The anode and cathode electrodes of a microbial fuel cell (MFC) stack, composed of 28 single MFCs, were used as the negative and positive electrodes, respectively of an internal self-charged supercapacitor. Particularly, carbon veil was used as the negative electrode and activated carbon with a Fe-based catalyst as the positive electrode. The red-ox reactions on the anode and cathode, self-charged these electrodes creating an internal electrochemical double layer capacitor. Galvanostatic discharges were performed at different current and time pulses. Supercapacitive-MFC (SC-MFC) was also tested at four different solution conductivities. SC-MFC had an equivalent series resistance (ESR) decreasing from 6.00 Ω to 3.42 Ω in four solutions with conductivity between 2.5 mScm−1 and 40 mScm−1. The ohmic resistance of the positive electrode corresponded to 75–80% of the overall ESR. The highest performance was achieved with a solution conductivity of 40 mS cm−1 and this was due to the positive electrode potential enhancement for the utilization of Fe-based catalysts. Maximum power was 36.9 mW (36.9 W m−3) that decreased with increasing pulse time. SC-MFC was subjected to 4520 cycles (8 days) with a pulse time of 5 s (ipulse 55 mA) and a self-recharging time of 150 s showing robust reproducibility.



中文翻译:

使用Fe N C阴极催化剂提高超级电容微生物燃料电池堆的发电量

由28个单个MFC组成的微生物燃料电池(MFC)堆栈的阳极和阴极分别用作内部自充电超级电容器的负电极和正电极。特别地,碳面纱用作负电极,活性炭和Fe基催化剂用作正电极。阳极和阴极上的氧化还原反应使这些电极自充电,从而形成内部电化学双层电容器。恒电流放电是在不同的电流和时间脉冲下进行的。还以四种不同的溶液电导率测试了超级电容MFC(SC-MFC)。在电导率介于2.5 mScm -1和40 mScm -1之间的四种溶液中,SC-MFC的等效串联电阻(ESR)从6.00Ω降低至3.42Ω。正极的欧姆电阻相当于整个ESR的75–80%。溶液电导率为40 mS cm -1时可实现最高性能,这是由于利用铁基催化剂提高了正极电势。最大功率为36.9 mW(36.9 W m -3),随着脉冲时间的增加而降低。SC-MFC经过4520个循环(8天),脉冲时间为5 s(i脉冲为55 mA),自充电时间为150 s,显示出良好的可重复性。

更新日期:2018-11-30
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