Doping molybdenum oxides with different non-metal atoms to promote bioelectrocatalysis in microbial fuel cells.

Xiaoshuai Wu, Xiaofen Li, Zhuanzhuan Shi, Xiaohai Wang, Zhikai Wang, Wen Lin, Shuang Wu, Wei Sun, Chang Ming Li

Journal of colloid and interface science 2023 Sep

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The sluggish extracellular electron transfer has been known as one of the bottlenecks to limit the power density of microbial fuel cells (MFCs). Herein, molybdenum oxides (MoOx) are doped with various types of non-metal atoms (N, P, and S) by electrostatic adsorption, followed by high-temperature carbonization. The as-prepared material is further used as MFC anode. Results indicate that all different elements-doped anodes can accelerate the electron transfer rate, and the great enhancement mechanism is attributed to synergistic effect of dopped non-metal atoms and the unique MoOx nanostructure, which offers high proximity and a large reaction surface area to promote microbe colonization. This not only enables efficient direct electron transfer but also enriches the flavin-like mediators for fast extracellular electron transfer. This work renders new insights into doping non-metal atoms onto metal oxides toward the enhancement of electrode kinetics at the anode of MFC. Copyright © 2023 Elsevier Inc. All rights reserved.

Citation

Xiaoshuai Wu, Xiaofen Li, Zhuanzhuan Shi, Xiaohai Wang, Zhikai Wang, Wen Lin, Shuang Wu, Wei Sun, Chang Ming Li. Doping molybdenum oxides with different non-metal atoms to promote bioelectrocatalysis in microbial fuel cells. Journal of colloid and interface science. 2023 Sep;645:371-379