Chen Junfeng, Zhao Kunqi, Wu Yiqun, Liu Jinyu, Wang Renjun, Yang Yuewei, Liu Yanyan
School of Life Sciences, Qufu Normal University, Qufu, 273165, People's Republic of China.
Environ Sci Pollut Res Int. 2023 Apr;30(17):49052-49059. doi: 10.1007/s11356-023-25787-y. Epub 2023 Feb 10.
The property of cathode in the microbial fuel cell (MFC) was one of the key factors limiting its output performance. MnO nanorods were prepared by a simple hydrothermal method as cathode catalysts for MFCs. There were a number of typical characteristic crystal planes of MnO nanorods like (110), (310), (121), and (501). Additionally, there were great many hydroxyl groups on the surface of nanorod-like MnO, which provided a rich set of active adsorption sites. The maximum power density (P) of MnO-MFC was 180 mW/m, which was 1.51 times that of hydrothermally synthesized MnO (119.07 mW/m), 4.28 times that of naturally synthesized MnO (42.05 mW/m), and 5.61 times that of the bare cathode (32.11 mW/m). The maximum voltage was 234 mV and the maximum stabilization time was 4 days. The characteristics of MnO, including rod-like structure, high specific surface area, and high conductivity, were conducive to providing more active sites for oxygen reduction reaction (ORR). Therefore, the air cathode modified by MnO nanorods was a kind of fuel cell electrode with great application potential.
微生物燃料电池（MFC）中阴极的性能是限制其输出性能的关键因素之一。通过简单的水热法制备了MnO纳米棒作为MFC的阴极催化剂。MnO纳米棒存在许多典型的特征晶面，如(110)、(310)、(121)和(501)。此外，类MnO纳米棒表面存在大量羟基，提供了丰富的活性吸附位点。MnO-MFC的最大功率密度（P）为180 mW/m²，是水热合成MnO（119.07 mW/m²）的1.51倍，天然合成MnO（42.05 mW/m²）的4.28倍，裸阴极（32.11 mW/m²）的5.61倍。最大电压为234 mV，最大稳定时间为4天。MnO的棒状结构、高比表面积和高电导率等特性有利于为氧还原反应（ORR）提供更多活性位点。因此，MnO纳米棒修饰的空气阴极是一种具有很大应用潜力的燃料电池电极。
