Synthesis, Characterization And Electrochemical Applications Of Conducting Polymers/graphene Composite Materials

We present an efficient Cu2+ electrosorption based on poly(m-phenylenediamine)/graphene(PmPD-G), which is formed via simultaneous reduction of graphene oxide(GO) to G and polymerization of m-phenylenediamine(mPD) to PmPD. The as-prepared PmPD-G composites were characterized by transmission electron microscopy(TEM), Fourier transform infrared(FT-IR) spectroscopy, thermo gravimetric analysis(TGA),and X-ray photoelectron spectroscopy(XPS). The electrosorption behaviors of Cu2+ on the PmPD-G electrode were also investigated in detail. Due to the excellent electrical conductivity and mechanical properties of G, the electrosorption of Cu2+ based on the PmPD-G is superior to that on the Pm PD.Graphene/polyaniline/MnO2(G-P-Mn) hybrids were synthesized via a facile approach that includes the reduction of graphene oxide(GO) to graphene(G) by aniline and then followed by oil-water interfacial polymerization of aniline to polyaniline(PANI) using a binary oxidant of KMnO4 and(NH4)2S2O8. PANI was orderly nanofibered and MnO2-doped due to interfacial polymerization and the use of binary oxidant. The hybrids conclude electrical double layer capacitance of G and pseudo capacitance of PANI and MnO2, showing enhanced specific capacitance of 800.1 F g-1 at 0.4A g-1 with good cycling stability.Poly(m-phenylenediamine)/graphene/MnO2(PmPD-G-MnO2) hybrids were synthesized by a simple method, and then the obtained hybrids were pyrolyzed to prepare the composites of N-doped carbon-grahene-manganese oxide(N/C-G-MnO). Poly(m-phenylenediamine) played a crucial role in the synthesis of N/C-G-MnO, which retain the large specific surface area(486.17m2 g-1) of graphene as well as the nitrogen source. The as-prepared N/C-G-MnO composites were characterized by scanning electron microscopy(SEM), Fourier transform infrared(FT-IR) spectroscopy, specific surface measurement(BET method), powder X-ray diffraction(XRD), and X-ray photoelectron spectroscopy(XPS). The electrocatalytic performances of theN/C-G-MnO for oxygen reduction reaction(ORR) were investigated in detail,and the results demonstrated that the prepared N/C-G-MnO catalysts exhibited excellent electrocatalytic activity toward ORR.