【摘要】随着DCMFC产电周期的增加, 阴阳极间的液位差明显增加。为解析此现象, 从蒸发、渗透压、生物代谢及电场角度考察了质子和水的传递行为, 研究了产水与电池性能的关系。结果表明:360 h内蒸发、渗透压引起的液量变化少于0.50 ml (液面降低0.5 mm) ;断路312 h, 阳极代谢气体使PEM形变凸向阴极, 阳极液减少6.20 ml (下降6.5 mm) , 阴极液增加10.75 ml (上升11.2 mm) , 两腔液位差达17.7 mm;通路下, 除膜的形变, 水合质子被电渗透到阴极并还原成水, 312 h内阳极液减少10.70 ml (下降11.1 mm) , 阴极液增加17.00 ml (上升17.7mm) , 两腔液位差达28.8 mm, 且产水量随电压的增大而增加。研究表明, 生物代谢及电渗透对两腔液量影响较大, 产水量可表征质子传递率。经计算该系统质子传递率大于54%, 为评判产电效率提供了简便依据。
【基金资助】 重大水专项 (2009ZX07212-002) ;
Relationship between liquid change in dual chambers and performance of electricity production in DCMFC
【Abstract】The liquid level difference between the cathode and the anode increased obviously with increase of operation cycles in the dual chamber microbial fuel cell (DCMFC). To analyze this phenomenon, the transport behavior of proton and water was investigated from evaporation, osmotic pressure, metabolism and electric field. The relationship between water production and the fuel’s performance was studied. The results showed that within 360 h, the liquid change due to evaporation and osmotic pressure was less than 0.50 mL (the liquid level declined by about 0.5 mm). Within 312 h of circuit breakage, the anodic metabolism gas led to the proton exchange membrane (PEM) deformation convex to the cathode. The anodic liquid decreased 6.20 mL (the liquid level reduced by about 6.5 mm), the cathodic liquid increased by 10.75 mL (the liquid level rose by about 11.2 mm) and the liquid level difference reached 17.7 mm. Under the circuit connection, except the PEM deformation, the protons were dragged by electro-osmosis to the cathode and reduced to water. Within 312 h, the anodic liquid decreased by 10.70 mL (the liquid level reduced by about 11.1 mm), the cathodic liquid increased by 17.00 mL (the liquid level rose by about 17.7 mm), and then a 28.8 mm liquid level difference was formed. Moreover, the water transmission increased with the increase of output voltage. The results implied that the biological metabolism and electro-osmosis had important influences on DCMFC liquid difference. It was possible to calculate proton transfer rate based on its water production. The proton transfer rate in the system was over 54%. This study provided a simple and intuitive basis for judging the electricity production efficiency.
【Keywords】 fuel cells; liquid volume change; electro-osmosis drag; proton transfer; bio-catalysis; anaerobic;
【Funds】 Major Water Special Foundation (2009ZX07212-002) ;
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