Enhanced electron transfer efficiency in microbial fuel cells utilizing hybrid microorganisms integrated with conjugated polymer-TiO2 photocatalyst under light illumination

Microbial Fuel Cells (MFCs) have garnered significant research attention as promising candidates for efficient and eco-friendly energy storage solutions. However, the persistent obstacle of limited electron transfer efficiency continues to hinder their widespread adoption. This study innovatively tackles the challenge of low electron transfer efficiency in MFCs by copolymerizing a conjugated polymer (PDA) with a photocatalytic material (TiO 2 ) onto Shewanella putrefaciens CN32 to create a hybrid microorganism. These hybrids, particularly when utilized as catalysts within MFCs under light illumination, significantly boosted electron transfer rates. Remarkably, the hybrid microorganism demonstrated an impressive current density of 1.07 mA/cm 2 in darkness, which soared to 5.657 mA/cm 2 under illumination. This microorganism exemplifies the synergistic interplay between the PDA and TiO 2 , where the PDA serves as an electron accumulator, while TiO 2 converts photons into valuable energy, ultimately enhancing the overall electrochemical performance of the MFCs. This work not only underscores the potential of integrating conjugated polymers and photocatalytic technology within bioelectrochemical systems but also expands the avenues for the development of more efficient and sustainable MFCs.