Polyimide-Carbon Nanotube Film Electrodes Modified By Using Several Kinds Of Transition Metals And Their Application In Analysis And Electrocatalysis

The conductive polymer electrode modified with nanomaterials play an important role in the development of electrochemistry.In this paper,the polyimide?PI?-carbon nanotube?CNT?film as a substrate electrode modified with In nanoparticles,RGO sheets,MoO₂ nanoparticles and flower-like Co-Ni alloy by electrodeposition method.The modified film electrodes are applied to the detection of caffeic acid?CA?,catalysis of hydrogen evolution reaction?HER?and oxygen evolution reaction?OER?.The surface topography and crystal structure of film electrode are obtained by X-ray powder diffraction?XRD?,X-ray photoelectron spectroscopy?XPS?,scanning electron microscopy?SEM?and transmission electron microscopy?TEM?.The electrochemical response of film electrode was measured by cyclic voltammetry?CV?,chronoamperometry?i-t?and linear sweep voltammetry?LSV?.The work of this paper mainly involves the following three aspects: 1.An Indium-modified reduced graphene oxide/polyimide-carbon nanotube film sensor for the amperometric determination of caffeic acidIn-modified reduced graphene oxide/polyimide-carbon nanotube?In/RGO/PI-CNT?film electrode was synthesized by using an electrochemical method,and it is applied to the detection of CA.Through an amperometric method,the current intensity and concentration of CA showed a good positive correlation in 0.2 M ABS solution.The In/RGO/PI-CNT film shows a wide linear range(5.00×10^-7 to 1.00×10^-3 M),low detection limit(1.67×10^-7 M,signal/noise=3),good long-term stability and the sensor can detect CA in real wine samples.2.MoO₂ nanoparticles on reduced graphene oxide/polyimide-carbon nanotube film as efficient hydrogen evolution electrocatalystMoO₂ nanoparticles modified reduced graphene oxide/polyimide-carbon nanotube?RGO/PI-CNT?film was synthesized by a simple electrodeposition method as an efficient catalyst for HER.The HER electrocatalytic property of MoO₂/RGO/PI-CNT film in acidic solution is evaluated by LSV.MoO₂/RGO/PI-CNT film exhibit a high electrocatalytic activity for HER at a small onset overpotential?-110 mV vs RHE?with a high current density(10.0 mA cm^-2)and a good stability.The low Tafel slope?68 mV dec-1?reveals the Volmer-Heyrovsky mechanism for HER.The comparison between MoO₂/RGO/PI-CNT film and other catalysts indicate that the MoO₂/RGO/PI-CNT film had a great performance for HER.3.An advanced flower-like Co-Ni/PI-CNT film electrocatalyst for oxygen evolution reactionThe flower-like Co-Ni alloy was fabricated on the PI-CNT film by the double step potential deposition method,and it is applied to the OER catalysis.The obtained results indicated Co-Ni?1:1?/PI-CNT film performed the best electrocatalytic property comparing with that of the Co-Ni/PI-CNT films with other atomic ratio.Besides,the deposition times played an important role to effect the OER activity of films and the research confirmed the Co-Ni?100s?/PI-CNT film was the best one.The prepared Co-Ni?1:1,100s?/PI-CNT film exhibited an earlier onset potential about 1.50 V and a small Tafel slope of 59 mV/decade.