Santoro Carlo, Abad Fernando Benito, Serov Alexey, Kodali Mounika, Howe Kerry J, Soavi Francesca, Atanassov Plamen
Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Albuquerque, NM 87131, USA.
Department of Civil Engineering, Center for Water and the Environment, University of New Mexico, MSC01 1070, Albuquerque, NM 87131, USA.
Appl Energy. 2017 Dec 15;208:25-36. doi: 10.1016/j.apenergy.2017.10.056.
In this work, the electrodes of a microbial desalination cell (MDC) are investigated as the positive and negative electrodes of an internal supercapacitor. The resulting system has been named a supercapacitive microbial desalination cell (SC-MDC). The electrodes are self-polarized by the red-ox reactions and therefore the anode acts as a negative electrode and the cathode as a positive electrode of the internal supercapacitor. In order to overcome cathodic losses, an additional capacitive electrode (AdE) was added and short-circuited with the SC-MDC cathode (SC-MDC-AdE). A total of 7600 discharge/self-recharge cycles (equivalent to 44 h of operation) of SC-MDC-AdE with a desalination chamber filled with an aqueous solution of 30 g L NaCl are reported. The same reactor system was operated with real seawater collected from Pacific Ocean for 88 h (15,100 cycles). Maximum power generated was 1.63 ± 0.04 W m for SC-MDC and 3.01 ± 0.01 W m for SC-MDC-AdE. Solution conductivity in the desalination reactor decreased by ∼50% after 23 h and by more than 60% after 44 h. There was no observable change in the pH during cell operation. Power/current pulses were generated without an external power supply.
在这项工作中，对微生物脱盐电池（MDC）的电极作为内部超级电容器的正负极进行了研究。由此产生的系统被命名为超级电容性微生物脱盐电池（SC-MDC）。电极通过氧化还原反应自极化，因此阳极作为内部超级电容器的负极，阴极作为正极。为了克服阴极损耗，添加了一个额外的电容性电极（AdE），并使其与SC-MDC阴极（SC-MDC-AdE）短路。报道了在脱盐室填充30 g L NaCl水溶液的情况下，SC-MDC-AdE进行了总共7600次放电/自充电循环（相当于运行44小时）。同一反应器系统使用从太平洋采集的实际海水运行了88小时（15100次循环）。SC-MDC产生的最大功率为1.63±0.04 W m，SC-MDC-AdE产生的最大功率为3.01±0.01 W m。脱盐反应器中的溶液电导率在23小时后下降了约50%，在44小时后下降了超过60%。电池运行期间pH值没有明显变化。无需外部电源即可产生功率/电流脉冲。
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