An efficient and inexpensive catalyst for oxygen reduction reaction (ORR), polyaniline (PANI) and β-MnO₂ nanocomposites (PANI/β-MnO₂), was developed for air-cathode microbial fuel cells (MFCs). The PANI/β-MnO₂, β-MnO₂, PANI and β-MnO₂ mixture modified graphite felt electrodes were fabricated as air-cathodes in double-chambered MFCs and their cell performances were compared. At a dosage of 6 mg cm⁻², the maximum power densities of MFCs with PANI/β-MnO₂, β-MnO₂, PANI and β-MnO₂ mixture cathodes reached 248, 183 and 204 mW m⁻², respectively, while the cathode resistances were 38.4, 45.5 and 42.3 Ω, respectively, according to impedance analysis. Weak interaction existed between the rod-like β-MnO₂ and surficial growth granular PANI, this together with the larger specific surface area and PANI electric conducting nature enhanced the electrochemical activity for ORR and improved the power generation. The PANI/β-MnO₂ nanocomposites are a promising cathode catalyst for practical application of MFCs.

用于氧还原反应（ORR），聚苯胺（PANI）和一种有效且廉价的催化剂β-MnO的₂纳米复合材料（PANI /β-MnO的₂）中，用于空气阴极微生物燃料电池（MFC）开发。聚苯胺/β-MnO的₂，β-MnO的₂，PANI和β-MnO的₂混合物改性石墨毡电极在双室微生物燃料电池制造为空气阴极和它们的电池性能进行了比较。在6毫克厘米的剂量^-2，与PANI /β-MnO的微生物燃料电池的最大功率密度₂，β-MnO的₂，PANI和β-MnO的_2个混合物阴极达到248，183和204毫瓦米^-2根据阻抗分析，阴极电阻分别为38.4，45.5和42.3Ω。之间存在弱相互作用棒状β-MnO的₂和表层生长粒状PANI，具有较大比表面积和PANI导电性质增强的ORR电化学活性和提高了发电此在一起。聚苯胺/β-MnO的₂纳米复合材料是用于微生物燃料电池的实际应用有希望的阴极催化剂。