The College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
The College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Bioresour Technol. 2015;187:299-304. doi: 10.1016/j.biortech.2015.03.131. Epub 2015 Apr 2.
A novel n-type Cu2O doped activated carbon (AC) air cathode (Cu/AC) was developed as an alternative to Pt electrode for oxygen reduction in microbial fuel cells (MFCs). The maximum power density of MFCs using this novel air cathode was as high as 1390±76mWm(-2), almost 59% higher than the bare AC air cathode. Specifically, the resistance including total resistance and charge transfer resistance significantly decreased comparing to the control. Tafel curve also showed the faster electro-transfer kinetics of Cu/AC with exchange current density of 1.03×10(-3)Acm(-2), which was 69% higher than the control. Ribbon-like Cu2O was deposited on the surface of AC with the mesopore surface area increasing. Cubic Cu2O crystals exclusively expose (111) planes with the interplanar crystal spacing of 2.48Å, which was the dominate active sites for oxygen reduction reaction (ORR). N-type Cu2O with oxygen vacancies played crucial roles in electrochemical catalytic activity.
一种新型的 n 型掺铜氧化亚铜活性炭（Cu/AC）空气阴极被开发出来，作为替代微生物燃料电池（MFC）中氧还原反应的铂电极。使用这种新型空气阴极的 MFC 的最大功率密度高达 1390±76mWm(-2)，几乎比裸 AC 空气阴极高 59%。具体来说，与对照相比，总电阻和电荷转移电阻都显著降低。塔菲尔曲线也表明 Cu/AC 的电子转移动力学更快，交换电流密度为 1.03×10(-3)Acm(-2)，比对照高 69%。带状的 Cu2O 沉积在 AC 的表面，介孔表面积增加。立方 Cu2O 晶体仅暴露（111）面，面间距为 2.48Å，这是氧还原反应（ORR）的主要活性位点。具有氧空位的 n 型 Cu2O 在电化学催化活性中起着至关重要的作用。
