摘要
采用体积分别为28 mL(mL-MFC)和4.5 L(L-MFC)的单室空气阴极微生物燃料电池,考察了扩大化对活性炭空气阴极性能的影响。mL-MFC的最大功率密度为30 W/m3(1 200 mW/m2),L-MFC的最大功率密度为7.3 W/m3(435 mW/m2),扩大化后活性炭空气阴极性能下降是致使L-MFC功率降低的主要原因。电化学阻抗(EIS)分析表明,L-MFC中阴极性能下降主要是由于工作水压增大,导致了阴极扩散电阻增大和氧气还原速率降低。通过串联或并联方式组合L-MFC,可明显提高电池的输出电压或电流;串并联组合后电池的功率密度有所下降,主要由电池连接时的接触电阻引起。
The performance of a smaller MFC （mL-MFC,28 mL） is compared with a larger MFC （L-MFC,4.5 L）to evaluate the scale-up performance of activated carbon air cathodes.The maximum power density of mL-MFC and LMFC are 30.0 W/m3 （1 200 mW/m2） and 7.3 W/m3 （435 mW/m2）,respectively.The lower power density of the LMFC is attributed to a performance decrease of the larger activated carbon air cathode compared with the small cathode.Electrochemical impedance spectroscopy tests are used to examine the reasons for the degraded performance.Diffusion resistance in the cathode increased with hydraulic pressure.These results indicate that the degradation in cathode performance is caused by water flooding.The connection of the 5 L-MFC units in series and parallel enables an increase of the voltages （1.3 V at 5.8 W/m3） and the currents （0.46 A at 5.8 W/m3）,while producing lower power density than the individual L-MFC.The power decrease is attributed to the connection resistance.
出处
《现代化工》
CAS
CSCD
北大核心
2013年第10期99-103,共5页
Modern Chemical Industry
基金
国家自然科学基金项目(21073163
J21206133)
国家"863"计划项目(2012AA0515102)
浙江省自然科学基金项目(z4110186)
关键词
微生物燃料电池
活性炭空气阴极
扩大化
串并联
microbial fuel cell
activated carbon air cathode
scale-up
series and parallel connection
