Electron transfer efficiency in electroactive biofilm is the limiting factor for bioelectricity output of bioelectrochemical system. Here, carbon felt (CF) is coated with manganese dioxide (MnO₂) which acts as electron mediator in electroactive biofilm. A wrapping layer of conducting Poly 3,4-ethylenedioxythiophene is developed to protect the MnO₂ and enhance electron transfer efficiency of MnO₂ mediator. The hybrid bioanode (PEDOT/MnO₂/CF bioanode) delivered the highest electron transfer efficiency (6.3 × 10⁻⁹ mol cm⁻² s^−1/2) and the highest capacitance of 4.78 F, much higher than bare CF bioanode (1.50 ± 0.04 × 10⁻⁹ mol cm⁻² s^−1/2 and 0.42 F). As a result, microbial fuel cells could produce a maximum power density of 1534 ± 13 mW m⁻², approximately 57.7% higher than that with the bare carbon felt anode (972 ± 21 mW m⁻²). Possible mechanisms are proposed to help understanding the different function of the PEDOT and MnO₂ on the anodic layer. This study introduces an effective method for the fabrication of high performance anode.

电活性生物膜中的电子转移效率是生物电化学系统生物电输出的限制因素。此处，碳毡（CF）涂有二氧化锰（MnO ₂），该二氧化锰在电活性生物膜中充当电子介体。开发了导电聚3,4-乙撑二氧噻吩的包裹层，以保护MnO ₂并提高MnO ₂介体的电子转移效率。混合生物阳极（PEDOT / MnO ₂ / CF生物阳极）提供了最高的电子转移效率（6.3×10 ^-9  mol cm ^-2  s ^-1/2）和最高电容4.78 F，远高于裸CF生物阳极（1.50） ±0.04×10 ^-9 摩尔厘米^-2  s ^-1/2和0.42 F）。结果，微生物燃料电池可产生的最大功率密度为1534±13 mW m ^-2，比使用裸碳毡阳极的最大功率密度（972±21 mW m ^-2）高约57.7％。提出了可能的机制来帮助理解阳极层上PEDOT和MnO ₂的不同功能。这项研究介绍了一种用于制造高性能阳极的有效方法。