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采用芳香亲核取代反应及溶液铸膜法,制备了一系列具有不同离子交换容量(IEC)的侧链型磺化聚芳醚砜(s SPFAE)阳离子交换膜,并作为分离膜应用于微生物燃料电池(MFC).研究了s SPFAE膜在双室MFC中产电性能并与商用阳离子交换膜进行了对比.s SPFAE膜的IEC为0.97~1.56 mmol/g,厚度约为80μm,在30℃时吸水率为20.9%~41.7%,电导率达到27.3~60.5 m S/cm,高于商用膜(22 m S/cm,420μm).对采用s SPFAE膜的MFC,根据峰功率密度法及极化曲线斜率法得到的MFC内阻约为29~64Ω,随着IEC的升高而降低,库伦效率达到47.7%~55%,其中s SPFAE-1.56膜的最大功率密度达到657.3 m W/m~2,且s SPFAE膜均表现出优于商用膜的产电性能.利用模拟等效电路对整个MFC系统进行EIS分析,结果表明阳极扩散内阻占这类MFC系统总内阻的87%~90%.结合循环伏安曲线、电化学阻抗谱测试及电极电势分析结果,表明分离膜对两极室间物质传递及阳极扩散阻抗有较大的影响.
A series of side chain sulfonated polyarylethersulfone (s SPFAE) cation exchange membranes with different ion exchange capacity (IEC) were prepared by aromatic nucleophilic substitution reaction and solution casting method, and used as separation membrane in microbial fuel Battery (MFC). The electrical properties of s SPFAE membrane in a two-compartment MFC were studied and compared with commercial cation exchange membranes. The IEC of the SPFAEE membrane was 0.97-1.56 mmol / g with a thickness of about 80 μm, absorbing water at 30 ℃ The conductivity was 27.3 ~ 60.5 m S / cm, which was higher than that of the commercial membrane (22 m S / cm, 420 μm). For the MFC with s SPFAE membrane, according to the peak power density method and the polarization curve The internal resistance of the MFC obtained by the slope method is about 29-64Ω. With the decrease of IEC, the coulombic efficiency reaches 47.7% -55%. The maximum power density of s SPFAE-1.56 film reaches 657.3 mW / m 2, And all the SPFEE membranes exhibited better performance than the commercial membranes.The EIS analysis of the whole MFC system using simulated equivalent circuit showed that the anode diffusion resistance accounted for 87% -90% of the total internal resistance of such MFC systems. Combined with cyclic voltammetry, electrochemical impedance spectroscopy and electrode potential analysis results show that the separation membrane between the two polar chamber material transfer and anode expansion Bulk impedance has a greater impact.