摘要
分别在20℃,37℃和45℃三个温度条件下以间歇方式运行大肠杆菌生物燃料电池(MFC),研究功率密度、电极电势、电化学阻抗等电化学性质随温度的变化规律.结果表明:温度从20℃提高到37℃,最大功率密度从53.35mW/m2(275mA/m2)增加到610.5mW/m2(2 775mA/m2),增长了10.5倍;同时阳极电极电势降低;且阳极电化学阻抗由741.9Ω降低到42.4Ω.在一定温度范围内,升高温度不仅能提高电池功率输出,而且能增强其电化学活性.但是,太高的温度反而不利于生物燃料电池的运行.45℃时的最大功率密度只有171mW/m2(600mA/m2),比37℃时最大功率610.5mW/m2(2 775mA/m2)减少72%;同时阳极电化学阻抗由42.4Ω增加到416.1Ω.大肠杆菌生物燃料电池在37℃时具有最佳的电化学性能.可见,温度在生物燃料电池运行中是一个非常重要的操作参数.
The microbial fuel cells（MFCs） were tested in batch mode at different tempera- tures of 20 ℃, 37 ℃, 45 ℃. Power density, electrode potential, electrochemical impedance were examined as a function of temperature. The temperature increased from 20 ℃ to 37 ℃, the peak power density enhanced by over 10.5 times from 53.35 mW/m2 （275 mA/m2） to 610.5 mW/m2 （2 775 mA/m2）. In the temperature range between 20 ℃ to 37 ℃, the anode potential gradually decreased, while the anode polarization resistance decreased from 741. 9 12 to 42.4 12Ω; elevated temperatures not only enhanced the power output, they also influenced the bioelectrocatalytic performance of MFCs. MFCs grown at elevated temperatures were more electrochemically active than those at lower temperature. But too high operation temperature was disadvantageous to the perform of MFC. At the temperature of 45 ℃, the peak power density was just 171 mW/m2 （600 mA/m2）, which was far lower than 610.5 mW/m2 at temperature of 37 ℃ ;while anode polariza- tion resistance increased from 42.4 12 to 416.1 12. At 37 ℃, MFC displayed an optimum electrical chemistry performance. From the data, we proposed that the temperature was a crucial opera- tional parameter in the yield of MFCs.
出处
《煤炭转化》
CAS
CSCD
北大核心
2012年第4期89-93,共5页
Coal Conversion
基金
国家自然科学基金资助项目(20776091
21176168)
关键词
微生物燃料电池
温度
电化学性能
microbial fuel cell, temperature, electrochemical behavior
