Increase in human activities across the globe has put forward several challenges for future generations, with uncontrolled energy demand near the top of the list. Relentless efforts are being made by researchers and policy makers to meet energy demands in renewable ways, which shows the possibility of several alternative energy systems.
Microbial fuel cell (MFC) is one such alternative energy generating system with an additional advantage of valorization of waste. Research in the field of MFC started almost a decade ago and significant improvement was reported up to pilot-scale operations, in spite of its inherent limitations. Cathodic reduction reaction is also as crucial as anodic oxidation in MFC. Plenty of reports consolidated the research outlined in the direction of anodic oxidation, while very few reports have been reported on cathodic reduction in comparison.
In this chapter, we brought together all the efforts made by researchers toward cathodic reduction to create a comprehensive understanding of the system.