不锈钢电沉积碳纳米管作为电极对于沉积物微生物燃料电池产电的影响

The effect of stainless steel electric deposition carbon nanotubes as electrode on the sediment microbial fuel cell

通过电化学的方法将碳纳米管沉积到不锈钢上,研究其作为电极对于沉积物微生物燃料电池(SMFC)产电性能的影响。结果表明,酸处理后的碳纳米管分散性好,并带上负电荷,有利于其电化学沉积到不锈钢上;用碳纳米管修饰后的不锈钢作为阴极可显著提高SMFC的产电性能,最大输出功率密度达到了31.6 mW/m2,是未修饰对照组的3.1倍,而作为阳极,其输出功率提高不明显。扫描电镜以及电化学分析结果表明,SMFC产电性能的提高主要是由于不锈钢丝上负载的碳纳米管,可显著提高阴极的电化学活性,增加阴极的氧还原速率。

The carbon nanotube was deposited on stainless steel by electrochemical method,the ef-fect on electricity generation performance in sediment microbial fuel cell with modified cathode was studied. The results showed that the carbon nanotuhe after acid treatment have a high dispersion and negative charge, which in favor of the electrochemical deposition on stainless steel. The elec-tricity generation was increased significant since using the stainless steel modified by carbon nan-otubes as cathode, and the maximum power density of 31.6 mW/m^2 was obtained, which is 3.1 times that in control, it was not obvious as the anode for increasing SMFC output power. The SEM （Scanning Electron Microscope） and LSV （Linear Sweep Voltammetry） showed that the carbon nan-otubes on the stainless steel could improve the cathodic electrochemical activity and enhance the cathodic oxygen reduction rate significantly.