锰
阴极保护
催化作用
铂金
微生物燃料电池
化学
无机化学
环境化学
电化学
电极
有机化学
阳极
物理化学
作者
Lixia Zhang,Chengshuai Liu,Zhuang Li,Weishan Li,Shungui Zhou,Jintao Zhang
标识
DOI:10.1016/j.bios.2009.02.010
摘要
In this paper, three manganese dioxide materials, α-MnO2, β-MnO2, γ-MnO2 were tested as alternative cathodic catalysts to platinum (Pt) in air-cathode microbial fuel cells (MFCs). Prepared via hydrothermal method, the manganese dioxides were characterized by X-ray powder diffraction patterns (XRD), the Brunauer–Emmett–Teller (BET) method and their average oxidation states (AOS) were determined by the potential voltammetric titration method. The electro-catalytic activity of MnO2 in neutral pH solution was determined by linear sweep voltammetry (LSV) and the results showed that all manganese dioxides can catalyze oxygen reduction reaction (ORR) in neutral medium with different catalytic activities. β-MnO2 appeared to hold the highest catalytic activity due to its highest BET surface area and AOS. β-MnO2 was further used as cathode catalyst in both cube and tube air-cathode MFCs, in which using Klebsiella pneumoniae (K. pneumoniae) biofilm as biocatalyst and utilizing glucose as a substrate in the anode chamber. It was found that tube MFC produced higher output power, with the maximum volumetric power density of 3773 ± 347 mW/m3, than cube MFC. This study suggests that using β-MnO2 instead of Pt could potentially improve the feasibility of scaling up MFC designs for real applications by lowering production cost.
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