MnO2-PPy/H-TiO2 ternary core-shell hybrid array electrode material and preparation method thereof

Abstract

The invention provides an MnO2-PPy / H-TiO2 ternary core-shell hybrid array electrode material and a preparation method thereof and belongs to the technical field of nano functional material and energystorage and conversion. The preparation method comprises the following steps: preparing an ordered TiO2 nano tube array by adopting an anodic oxidation process, and performing crystallization annealing treatment and electrochemical hydrogenation reduction on the ordered TiO2 nano tube array to obtain an H-TiO2 nano tube array; then, depositing conductive polymer PPy thin layers with high specificcapacitance on the inner and outer surfaces of the H-TiO2 nano tube array; and finally, depositing nano MnO2 with high specific capacitance on the inner and outer surfaces of the PPy / H-TiO2 nano tubeto prepare the MnO2-PPy / H-TiO2 ternary core-shell hybrid array electrode material. When the current density is 1A.g<-1>, the specific capacitance can reach 563.6F.g<-1>; and when the current density is 10A.g<-1>, the specific capacitance is only lowered by 9.6% after charging and discharging for 5000 cycles.

Description

technical field [0001] The invention relates to the technical field of nano functional materials, energy storage and conversion, in particular to a kind of MnO 2 -PPy / H-TiO 2 A ternary core-shell hybrid array electrode material and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of high-efficiency energy storage device, which has the advantages of fast charge and discharge, long cycle life, high power density and good ultra-low temperature characteristics. It has broad application prospects and Development potential. Supercapacitors are mainly composed of electrode materials, electrolytes, diaphragms, and end plates, among which electrode materials are the key to determining their supercapacitive characteristics. [0003] Electrode materials for supercapacitors not only require high specific capacity and specific power, but also low internal resistance to meet the requirements of high current and fast charge and discharge. At the ...

AI Technical Summary

Problems solved by technology

There are three main types of electrode materials for supercapacitors, namely carbon materials, metal oxides, conductive polymers, etc. Among them, carbon materials are the most extensively researched and applied, but the electric double layer charge energy storage method of carbon materials determines to a certain extent its The specific capacitance is low, and it is difficult to meet the requirements of high energy / power density; the faradaic pseudocapacitance generated by metal oxide and conductive polymer electrode materials through the reversible oxidation-reduction reaction between the electrode / electrolyte interface is much greater than that of carbon-based electrode materials. Electric double layer capacitance, which can reach 10 to 100 times that of carbon electrode materials

However, the internal resistance of metal oxides is large, the utilization rate in the electrode reaction process is low, the properties are unstable in the long-term charge and discharge process, and the volume expansion or contraction is easy to occur, which affects its electrochemical stability.

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