SnO_2/MWCNTs复合改性阳极对海底沉积物微生物燃料电池电化学性能的影响

Effect of SnO_2/MWCNTs Composite Modified Anode on Electrochemical Performance of Marine Sediment Microbial Fuel Cells

采用电沉积法和浸渍法制备了氧化锡/多壁碳纳米管(SnO_2/MWCNTs)复合材料,并首次将其应用在海底沉积物微生物燃料电池(MSMFCs)的阳极改性,测试分析SnO_2/MWCNTs改性阳极的电化学性能和由其组成的电池性能。结果表明,SnO_2/MWCNTs复合阳极的氧化还原电化学活性和电子转移动力学活性分别是空白组的28.26倍和983.7倍;电容性能是空白组的43.14倍;阳极电荷转移电阻约是空白组的1/4。复合改性阳极组MSMFCs的最大功率密度(1 085.1 m W/m2)是空白组的2.17倍。机理分析表明,MWCNTs提高了阳极的导电性,SnO_2使氧化还原反应更容易进行,阳极的电容性能增加;在特殊的海洋弱碱条件下,SnO_2和MWCNTs的增强协同作用使复合改性阳极表现出更加优异的性能。

SnO_2/MWCNTs composite modified anode was prepared by electrodeposition and impregnation methods,and was applied to modify the anodes of the marine sediment microbial fuel cells( MSMFCs). Electrochemical performances of the MSMFCs with the SnO_2/MWCNTs composite modified anode were investigated. Results indicated that the electrochemical activity,kinetic activity of electron transfer and the capacitance property of the SnO_2/MWCNTs composite modified anode were 28. 26,983. 7 and 43. 14 times as high as those of the blank; anodic charge transfer resistance was about 1/4 of that of blank group.The maximum power density of the modified MSMFCs was 1 085. 1 m W/m2,2. 17 times of that of blank group. Mechanism analysis of the composite modified anode showed that the MWCNTs could raise the conductivity of anode,and SnO_2 made the redox reaction more easily,resulting in increased capacitance performance of the anode; it was the marine weak alkaline condition that enhanced the synergistic effect of SnO_2/MWCNTs composite so that the modified cell showed excellent performance.