Microbial Peroxide Producing Cells (MPPCs) and Electrochemical Hydrogen Peroxide Synthesis

Microbial peroxide-producing cells (MPPCs) have emerged as a bioelectrochemical platform for sustainable hydrogen peroxide (H2O2) production. Unlike conventional chemical synthesis methods, MPPCs leverage microbial metabolism to drive oxygen reduction at the cathode, yielding H2O2 as a valuable oxidant for water treatment. The process involves electron transfer via direct electron exchange (nanowires, cytochromes) or mediated pathways (redox shuttles). The efficiency of MPPCs depends on microbial strain selection, electrode materials, reactor design, and operational conditions. Studies have demonstrated that Geobacter, Shewanella, and Pseudomonas species play a crucial role in enhancing electron transfer and optimizing H2O2 yield. Compared to traditional anthraquinone-based H2O2 synthesis, MPPCs offer a cost-effective, low-energy, and environmentally friendly alternative. However, major challenges include low peroxide stability, cathode fouling, and inefficient oxygen reduction reaction (ORR) kinetics. To overcome these issues, nanostructured catalysts, improved electrode coatings, and co-culture microbial systems are being explored. MPPCs hold the potential for in situ H2O2 generation in wastewater treatment, environmental remediation, and decentralized disinfection applications. Future research should focus on scaling up MPPC technology, optimizing electrode architecture, and integrating it with other advanced oxidation processes (AOPs) to enhance pollutant degradation efficiency.