摘要
实验采用双室型微生物燃料电池(MFC),以生活废水中厌氧菌作为生物催化剂,葡萄糖为燃料,通过5个不同温度条件下的间歇运行,应用循环伏安、交流阻抗、极化测试等电化学方法考察温度对电池产电性能的影响。结果表明,一定温度范围内,提高温度有助于增强微生物的电化学活性,降低传荷阻抗,提高电池输出功率密度和交换电流密度。32℃时,电池产电效能最佳,电池功率密度和交换电流密度分别达到156.2 mW/m2和8.02×10-5 mA/m2,温度太低或太高均不利于细菌的电化学活性。体系温度为18℃、25℃、32℃、39℃、46℃时,传荷阻抗Rct在阳极内阻中占的比例分别为97.99%、84.02%、47.36%、91.30%、99.61%,说明传荷阻抗在阳极内阻中占绝对份额,MFC是传荷过程控制下的电化学反应体系。
Taking anaerobic bacteria from domestic waste water as biocatalyst,glucose as fuel,a double-chamber microbial fuel cell （MFC） was constructed. The battery was operated for 5 cycles intermittently.The effect of temperature on its producing electricity characteristics was investigated by electrochemical test methods,including cyclic voltammogram,alternating current impedance and polarization test. In a specific temperature range,electrochemical activity of the microbe improved with increasing temperature,power density and exchange current density were enhanced,while charge transfer impedance decreased. At 32 ℃ the battery showed the best performance. Power density and exchange current density reached 156.2 mW/m2 and 8.02＆#215;10-5 mA/m2 at 32 ℃, respectively. However,it was not beneficial to bacterial activity at a too low or too high temperature. When the temperature of the battery was at 18 ℃,25 ℃,32 ℃,39 ℃ and 46 ℃,the percentages of load transfer resistance in anode resistance were 97.99%, 84.02%, 47.36%, 91.30% and 99.61%, respectively. It demonstrated that charge transfer impedance occupied the overwhelming share of total resistance at the anode. MFC was an electrochemical system under the control of charge transfer process.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2014年第3期629-633,650,共6页
Chemical Industry and Engineering Progress
基金
国家自然科学基金项目(20776091
21176168)
