Abstract
In order to research the influences of lead dioxide(PbO2) on reduction and electrogenesis capacity in microbial fuel cell(MFC),titanium-based lead dioxide(PbO2/Ti) was prepared via an electrodeposition technique and applied in a doublechamber MFC as the cathode material.The valence state,crystal form,morphological character and electrochemical properties of PbO2 were analyzed by X-ray photoelectron spectroscopy(XPS),X-ray diffraction spectrum(XRD),scanning electron microscope(SEM) and cyclic voltammetry(CV),respectively.Bioelectricity generation of the MFC was evaluated by removal rate of chemical oxygen demand(COD),voltage output and polarization curve measurement.The results showed that COD removal rate was greater in PbO2/Ti-based MFC(87.68%) than that in Ti-based MFC(71.4%).The voltage output in the former reached 760 mV with an external resistance of 1 000 Ω,which was 30 times higher than that in the control case.The maximum power density of PbO2/Ti-based MFC was 379 mW m–2 at a current density of 1 185 mA m–2.Meanwhile,it was proved that PbO2 was reduced into PbO and Pb3(PO4)2.In conclusion,PbO2 with its strong oxidizing property could be used as cheap and efficient cathode material in MFC,greatly improving the capacity of electricity production.
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