Research Of Layered Manganese Oxide Composite Electrode Materials

Layered manganese oxide and its composite has been widely studied over the past decades, for example in catalysts, supercapacitors, magnetic materials, batteries, sensors.The composite film electrode materials of polyaniline/2,2'-bipyridine iron/polyphenylene sulfide and layered manganese oxide were prepared by the layer-by-layer adsorption technique and the delamination/reassembling processes. Research the composite in the field of photoelectrocatalytic degradation or the supercapacitor application. The concrete contents are as followed:1.Morphology and structure, electrochemical properties of layered manganese oxide composite materials were characterized by means of scanning electron microscopy(SEM),X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible (UV-vis) spectra, thermogravimetry analysis (TG),and electrochemical measurements.2.To compare with different methods of polyaniline and layered manganese oxide composite materials on degradation of RhB under visible light irradiation. The composite was prepared by the layer-by-layer adsorption technique with an applied potential of 0.9 V versus standard calomel electrode,about 70% of rhodamine B was degraded within 70 min. The composite was prepared by the delamination/reassembling process at the same conditions, about 50% of rhodamine B was degraded. The results showed that PANI could enhance the efficiency of photon harvesting, and the impressed current could reduce the chance of electron-hole recombination. The two methods of composite materials with different degradation were discussed.3.As the composite material was prepared by the layer-by-layer adsorption technique with good photoelectrocatalytic performance, we prepared layered manganese oxide/2,2'-bipyridine iron self-assembled film. This system could degrade 57% of RhB in 80 min.Compare with layered manganese oxide/polyaniline self-assembled film, the degradation of the small molecule complex materials was slightly lower, the reasons were discussed.4.2,2'-bipyridine iron/polyphenylene sulfide intercalated manganese oxide by the delamination/reassembling process, and compare with their electrochemical properties as electrode materials for supercapacitors. 2,2'-bipyridine iron-intercalated manganese oxide composites showed a specific capacitance of 428 F·g-1.Polyphenylene sulfide-intercalated manganese oxide composites showed a specific capacitance of 320 F·g-1.Both of the composite were constant current charge-discharge cycle test 1000 times, the capacitance decreased 6% of initial value.