Bio-functional metal organic framework composite as bioanode for enhanced electricity generation by a microbial fuel cell

As a green and eco-friendly power generation technology, microbial fuel cell (MFC) still faces challenge for application due to the low power density. To achieve the purpose, a novel bio-functional metal organic framework (MOF) is fabricated through a facile hydrothermal method and applied as anodic material in the MFC. The results indicate that the NH₂-MIL-53(Fe) anode decreases the electron transfer resistance, enhances the bio-electrocatalystic properties and facilitates bacterial conglutination on the anodic surface. A great energy output of 2.55 W m⁻³ is achieved by the MFC with NH₂-MIL-53(Fe) anode, which is 53% larger than that of MFC with acetylene black anode (1.66 W m⁻³), while the dominant genus on the NH₂-MIL-53(Fe) anode are exoelectrogens Geobacter (abundance of 20.95%). The excellent results mainly ascribed to the synergy of unique structure of MOF and each component of NH₂-MIL-53(Fe), including enlarged electrochemical active area, improved the bio-affinity and extracellular electron transfer rate by iron oxide and amino groups. This work provides valuable information for applying more bio-functional MOFs to construct high-performance MFCs.