Study On MIL-53(Fe) Derivatives’ Power Generation And Energy Storage Performance In Microbial Fuel Cells

Microbial Fuel Cell(MFC)is a device that uses microorganisms as catalyst to oxidize organic matter and generate electricity.The Benthic Microbial Fuel Cell(BMFC)derived from MFC which can use the rich organic matter in the ocean floor to power microelectrical equipment in an unmanned environment underwater.Anode is the most important part of MFC as the place for microbial growth and power generation.Therefore,choosing a suitable anode material plays a vital role in improving the overall power generation performance of MFC.In this paper,the metal organic framework MIL-53(Fe)was successfully synthesized by hydrothermal method.And used MIL-53(Fe)as the precursor,NH2-MIL-53(Fe)was obtained with the linked amino group.Scanning Electron Microscope(SEM)tests showed that NH2-MIL-53(Fe)was a spindle structure with rough surface.The corresponding characterization were indicated by X-Ray Diffraction(XRD),X-Ray Photoelectron Spectroscopy(XPS),and Fourier Transform Infrared Spectroscopy(FTIR).NH2-MIL-53(Fe),MIL-53(Fe),blank C electrodes were prepared by coating method and used as anodes in MFC.The maximum power densities were 2.55 W/m~3,2.10 W/m~3,1.66 W/m~3,respectively.In the charge 60 minutes and discharge 60 minutes test(C60/D60),the stable currents of NH2-MIL-53(Fe),MIL-53(Fe),and blank C anode MFC were 1.51 A/m~2,1.34 A/m~2,0.66A/m~2.Secondly,MIL-53(Fe)was synthesized into porous carbon material C-MIL-53(Fe)by one-step pyrolysis in an inert environment,and C-MIL-53(Fe)/PANI material was synthesized after compounding PANI.Scanning Electron Microscope(SEM)tests showed that C-MIL-53(Fe)/PANI was a porous carbon structure with PANI partially attached to the surface.The corresponding characterization were indicated by X-Ray Diffraction(XRD),X-Ray Photoelectron Spectroscopy(XPS),and Fourier Transform Infrared Spectroscopy(FTIR).C-MIL-53(Fe)/PANI,C-MIL-53(Fe),and MIL-53(Fe)electrodes were prepared by coating method and used as anodes in MFC.The maximum power densities obtained were4.66 W/m~3,4.18 W/m~3,2.10 W/m~3.In the charge 60 minutes and discharge 60 minutes test(C60/D60),the high currents of C-MIL-53(Fe)/PANI,C-MIL-53(Fe),MIL-53(Fe)anode MFC were 29.61 A/m~2,27.68 A/m~2,11.66 A/m~2,indicating that after PANI,C-MIL-53(Fe)/PANI has the ability to store charge and it can make microorganisms possess better catalytic ability.Finally,NH2-MIL-53(Fe)and C-MIL-53(Fe)/PANI were used as anodes in sea mud and a simulated BMFC was constructed.The maximum power density of NH2-MIL-53(Fe)anode BMFC reaches 3.88 W/m~3,and the high current released by NH2-MIL-53(Fe)anode BMFC after charging for 15 minutes is 36.18 A/m~2;The maximum power density of C-MIL-53(Fe)/PANI anode BMFC reaches 5.13 W/m~3,and the high current released by C-MIL-53(Fe)/PANI anode BMFC after charging for 15 minutes is 67.62 A/m~2.