New 3d paper-based microbial fuel cell developed
Researchers at Iowa State University in the US have successfully developed a revolutionary 3D paper-based microbial fuel cell, capable of generating electricity in an eco-friendly manner, without the need for any external power source. This cutting-edge proof-of-concept device utilizes capillary action to direct liquids through the fuel cell system, eliminating the requirement for external energy.
During a five-day trial, the paper-based microbial fuel cell demonstrated the generation of electric current through the formation of a biofilm on its anode. This biofilm plays a crucial role in the current production of the microbial fuel cell, as larger and thicker biofilms lead to increased electricity generation.
The process of electron transport within individual bacterial cells is intricate, involving multiple enzyme-catalyzed reactions. The electrons are then able to reach the anode through various modes of electron transport, specific to each type of bacteria. For instance, in the case of Shewanella Oneidensis MR-1 bacteria, electrons are shuttled to the anode primarily through excreted soluble redox molecules and biological nanowires, with direct contact having minimal impact on current generation.
The significance of the biofilm lies in its ability to aid in the adsorption of redox molecules to the electrode, making it a crucial component for high-power-density microbial fuel cells. Without sufficient time for biofilm formation, the current and power data would predominantly be associated with extracellular electron transfer, which does not fully represent the electrical production capabilities of microbial fuel cells.
The paper-based microbial fuel cell showcased in this study can operate independently for an extended period, marking a major breakthrough that could expand the range of applications for microbial fuel cells. The researchers highlighted that all the electricity generated by this device is usable, as no external power is required to drive the fluids through the system, making it a promising advancement in this field.
Published in the journal Technology, this groundbreaking research paves the way for more sustainable and efficient electricity generation through microbial fuel cells in the future.
