Tu Li-Xing, Zhu Neng-Wu, Wu Ping-Xiao, Li Ping, Wu Jin-Hua
College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China.
Huan Jing Ke Xue. 2013 Apr;34(4):1617-22.
The cathodic catalyst plays an important role in the electricity generation of the microbial fuel cell (MFC). In order to evaluate the efficiency of oxygen reduction on the carbon nanotube (CNT) functionalized with different carboxylic groups supported Pt, carboxylic CNTs under the conditions of 80 degrees C and 95 degrees C were prepared, respectively. Pt/CNT catalysts (Pt/CNT-80 and Pt/CNT-95) was prepared by the dipping-precipitation method and their oxygen reduction efficiency was tested in the MFC (MFC-80, MFC-95 and MFC-C) with the air cathode. The results showed that the maximum power output densities of the MFC-95 and MFC-80 were 568.8 mWx m(-2) and 412.8 mWx m(-2), internal resistances were 204.7 omega and 207.7 omega, and open circuit potentials were 0.719 V and 0.651 V, respectively. However, the maximum power output density of the control MFC-C was only 5.4 mW x m(-2), and its internal resistance was 826.2 omega. XPS and XRD analysis results demonstrate that the efficiency of Pt/CNT-95 catalyst is better than Pt/CNT-80 may result from the surface of carboxylic CNT in the 95 degrees C introduced rich oxygen containing groups.
阴极催化剂在微生物燃料电池（MFC）的发电过程中起着重要作用。为了评估负载在不同羧基功能化碳纳米管（CNT）上的铂对氧还原的效率，分别制备了80℃和95℃条件下的羧基化碳纳米管。采用浸渍沉淀法制备了Pt/CNT催化剂（Pt/CNT - 80和Pt/CNT - 95），并在带有空气阴极的MFC（MFC - 80、MFC - 95和MFC - C）中测试了它们的氧还原效率。结果表明，MFC - 95和MFC - 80的最大功率输出密度分别为568.8 mW·m⁻²和412.8 mW·m⁻²，内阻分别为204.7Ω和207.7Ω，开路电位分别为0.719 V和0.651 V。然而，对照MFC - C的最大功率输出密度仅为5.4 mW·m⁻²，其内阻为826.2Ω。XPS和XRD分析结果表明，Pt/CNT - 95催化剂的效率优于Pt/CNT - 80，这可能是由于95℃下羧基化碳纳米管表面引入了丰富的含氧基团。
