Study On Construction And Performance Of Biofuel Cells Anode Based On N-doped Carbon Nanomaterials And Cobaltosic Oxide

Biofuel cells(BFCs)are special kinds of fuel cells which directly convert biomass such as sugars or alcohol to electrical energy by utilizing the microorganism or enzyme as the catalyst.Among them,enzyme biofuel cells(EBFCs)have aroused many researchers' interests because of their specificity and high efficiency in oxidizing substrates,and their operability under mild environment.Recently,scientists are still taking great efforts to improve the output power and prolong the life time of EBFCs through various approaches.Besides,non-enzymatic biofuel cells(NEBFCs)have also been drawing many people's attention,because they can solve the problems of EBFCs such as poor stability,short life,low power output.In this paper,N-doped porous carbon materials and Co3O4 hollow nanoprism were prepared and utilized to build two kinds of EBFCs and one non-enzymatic glucose fuel cell,and the performance of the cells were studied.The main content is as follows:(1)N-doped porous carbon/graphene composite materials(GNPCSs)were prepared by carbonizing Zn based Metal-Organic Frameworks(ZIF-8)in-situ growing on the surface of grapheme oxide,and utilized to immobilize glucose oxidase(GOD)with glutaraldehyde as cross-linking agent and Fc-CHO as mediator to obtain(CS/GA-GOD-FC/GNPCSs)/GC enzyme electrode,and the performances of the enzyme electrode were studied.Furthermore,the(CS/GA-GOD-FC/GNPCSs)/GC electrode was combined with a Pt electrode to construct a biefuel cell and the open circuit potential is 0.57 V and the maximum power density is 64 ?W cm-2 at 0.23 V.(2)Au nanoparticles decorated porous hollow tubular carbon materials(PHTCs@Au)by direct carbonization of(ZIF-8)derived from ZnO nanorods were prepared.And PHTCs@Au was utilized as enzyme immobilizing matrix to mix with GOD,glutaraldehyde was used as cross-linking agent to construct a bioanode for glucose/O2 biofuel cells.For the assembled glucose/O2 BFC with the PHTCs@Au/GOD-GA/GC electrode as the bioanode and a commercial Pt plate electrode as the cathode,the maximum power density of 310?w cm-2 can be obtained at 0.23 V,and the open circuit potential is 0.63 V.(3)Co3O4 Hollow nanoprism(Co3O4 HNP)was prepared by oxidizing Co based Metal-Organic Frameworks(ZIF-67),and the obtained Co3O4 HNP was characterized by scanning electron microscope(SEM),X-ray diffraction(XRD)and used to prepare Co3O4 HNP/GC electrode.The performance of the Co3O4 HNP/GC electrode was studied.For the assembled non-enzymatic glucose/O2 BFC,Co3O4 HNP/GC electrode was used as anode and the commercial E-TEK Pt/C/Ni electrode was used as the cathode.The maximum power density of the NEBFCs is 485 ?w cm-2,and the open circuit potential is 0.57 V.