Power generation using different cation, anion, and ultrafiltration membranes in microbial fuel cells
Power generation using different cation, anion, and ultrafiltration membranes in microbial fuel cells
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DOI：
10.1021/es062202m
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发表时间：
2007-02-01
影响因子：
11.4
通讯作者：
Logan, Bruce E.
中科院分区：
文献类型：
--
作者：
Kim, Jung Rae;Cheng, Shaoan;Logan, Bruce E.
质子交换膜（PEM）通常用于微生物燃料电池（MFC）中，以分离阳极室和阴极室中的液体，同时允许质子在室之间通过。然而，在介质中以高浓度存在的带负电荷或带正电荷的物质也可用于在发电期间维持电荷平衡。相对于在不同类型的MFC中使用常用的PEM（Nafion）、阳离子交换膜（CEM）或具有0.5K、1 K和3 K道尔顿的分子量截止值的三种不同的超滤（UF）膜所实现的值，阴离子交换膜（AEM）在MFC中产生最大的功率密度（高达610 mW/m2）和库仑效率（72%）。AEM性能的提高是由于磷酸根阴离子促进的质子电荷转移和低内阻。膜的类型影响最大功率密度在两室，空气阴极立方体微生物燃料电池（C-MFC）与低内阻（84-91 Ω的所有膜，除UF-0.5K），但不影响在两室水阴极瓶微生物燃料电池（B-MFC），由于其较高的内阻（1230-1272 Ω，除UF-0.5K）。UF 0.5K膜产生非常高的内阻（6009 Ω，B-MFC;1814 Ω，C-MFC），并且对氧气（k（0）的传质系数=0.19 × 10（-4）cm/s）和乙酸盐（k（A）=0.89 × 10（-8）cm/s）的渗透性最低。Nafion膜对氧气的渗透性最强（k（0）=1.3 x 10（-4）cm/s），UF-3 K膜对乙酸盐的渗透性最强（k（A）=7.2 x 10（-8）cm/s）。基于测量的库仑效率和使用Nafion、CEM和AEM膜的生物质生产和底物损失的估计，只有一小部分底物未被考虑（4-8%），而对于OF膜，相当大一部分底物损失于未识别的过程（40-89%）。这些结果表明，许多类型的膜可用于双室MFC，甚至转移带负电荷的物质的膜。
Proton exchange membranes (PEMs) are often used in microbial fuel cells (MFCs) to separate the liquid in the anode and cathode chambers while allowing protons to pass between the chambers. However, negatively or positively charged species present at high concentrations in the medium can also be used to maintain charge balance during power generation. An anion exchange membrane (AEM) produced the largest power density (up to 610 mW/m(2)) and Coulombic efficiency (72%) in MFCs relative to values achieved with a commonly used PEM (Nafion), a cation exchange membrane (CEM), or three different ultrafiltration (UF) membranes with molecular weight cut offs of 0.5K, 1 K, and 3K Daltons in different types of MFCs. The increased performance of the AEM was due to proton charge-transfer facilitated by phosphate anions and low internal resistance. The type of membrane affected maximum power densities in two-chamber, air-cathode cube MFCs (C-MFCs) with low internal resistance (84-91 Omega for all membranes except UF-0.5K)but not in two-chamber aqueous-cathode bottle MFCs (B-MFCs) due to their higher internal resistances (1230-1272 Omega except UF-0.5K). The UF0.5K membrane produced very high internal resistances (6009 Omega, B-MFC;1814 Omega, C-MFC) and was the least permeable to both oxygen (mass transfer coefficient of k(0)=0.19 x 10(-4) cm/s) and acetate (k(A)=0.89 x 10(-8) cm/s). Nafion was the most permeable membrane to oxygen (k(0)=1.3 x 10(-4) cm/s), and the UF-3K membrane was the most permeable to acetate (k(A)=7.2 x 10(-8) cm/s). Only a small percent of substrate was unaccounted for based on measured Coulombic efficiencies and estimates of biomass production and substrate losses using Nafion, CEM, and AEM membranes (4-8%), while a substantial portion of substrate was lost to unidentified processes for the OF membranes (40-89%). These results show that many types of membranes can be used in two-chambered MFCs, even membranes that transfer negatively charged species.