Catalysis Kinetics and Porous Analysis of Rolling Activated Carbon-PTFE Air-Cathode in Microbial Fuel Cells
Catalysis Kinetics and Porous Analysis of Rolling Activated Carbon-PTFE Air-Cathode in Microbial Fuel Cells
复制标题
微生物燃料电池中滚动活性炭-PTFE 空气阴极的催化动力学和孔隙分析
DOI：
10.1021/es303619a
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发表时间：
2012-12-04
影响因子：
11.4
通讯作者：
Wang, Xin
中科院分区：
文献类型：
--
作者：
Dong, Heng;Yu, Hongbing;Wang, Xin
微生物燃料电池（MFC）是一种环境友好的废水处理技术，但其效率低、成本高。在我们之前的工作中，通过引入新型活性炭（AC）空气阴极（ACAC），大大提高了基于资本成本的功率输出。通过催化动力学和炭粉及催化剂层的孔分析，研究了该催化剂的催化性能。使用普通AC（AC 1#）、超级电容器AC（AC 2#）和非AC（XC-72）粉末作为催化剂。与未轧制前的相应碳粉相比，用PTFE轧制的CL的氧还原反应（ORR）的电子转移数（n）增加了5 - 23%，而Pt/C用Nafion刷涂作为CL时的n值降低了38%，表明PTFE粘合剂轧制过程显著提高了碳催化剂的催化活性。活性炭粉末的烧结面积是非活性炭粉末的2~4倍，使MFC的功率密度提高了1.3-1.9倍。此外，发现AC 1#中的微孔分布比AC 2#中更均匀，这可能是ACAC1#的功率密度（1355 +/-26 mW. m（-2））比ACAC2#的1086 +/-8 mW. m-（2）增加25%的原因。
The microbial fuel cell (MFC), being an environment-friendly technology for wastewater treatment, is limited by low efficiency and high cost. Power output based on capital cost had been greatly increased in our previous work by introducing a novel activated carbon (AC) air-cathode (ACAC). The catalysis behavior of this ACAC was studied here based on catalysis kinetics and pore analysis of both carbon powders and catalyst layers (CLs). Plain AC (AC1#), ultracapacitor AC (AC2#), and non-AC (XC-72) powders were used as catalysts. The electron transfer number (n) of oxygen reduction reaction (ORR) with CLs increased by 5-23% compared to those n values of corresponding carbon powders before being rolled to CLs with PTFE, while the n value of Pt/C decreased by 38% when it was brushed with Nafion as the CL, indicating that rolling procedure with PTFE binder substantially increased the catalytic activity of carbon catalysts. Two-four times larger in micropore area of AC powders than non-AC powder resulted in 1.3-1.9 times increase in power density of MFCs. In addition, more uniform distribution of microporosity was found in AC1# than in AC2#, which could be the reason for the 25% increase in power density of ACAC1# (1355 +/- 26 mW.m(-2)) compared to 1086 +/- 8 mW.m-(2) of ACAC2#.