Ruthenium dioxide/carbon composite nano-material for super capacitor, and preparation method thereof

Abstract

The invention discloses a preparation method of a ruthenium dioxide composite electrode material. The method comprises steps that: ethanol solution is added to a ruthenium source solution, mixing is carried out, a cationic surfactant is added and is taken as a protective agent, uniform mixing is carried out, the mixed solution is sealed in an autoclave, after heating and reaction, the resultant after centrifugation and washing is mixed with toluene, carbon matrixes are utilized for absorption, after centrifugation and washing, and the ruthenium dioxide / carbon composite nano-material is acquired after high temperature roasting. The method has advantages of simple technology, high yield, low cost and no pollution, the prepared ruthenium dioxide / carbon composite nano-material has properties of fine dimensions of active components, huge specific surface area and uniform mixing. The prepared ruthenium dioxide / carbon composite nano-material is an excellent reversible charging / discharging active substance, has the super specific surface area, can realize rapid charging / discharging, has excellent electrochemistry performance and has wide application prospects.

Description

technical field [0001] The invention belongs to the field of electrochemistry and inorganic materials, in particular to a ruthenium dioxide / carbon composite nano-electrode material for a supercapacitor and a preparation method thereof. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of clean energy storage device. Its specific capacity is 3 to 4 orders of magnitude higher than that of traditional capacitors, and its power density is 10 to 100 times that of batteries. Moreover, it also has many advantages such as fast charging and discharging, long service life, excellent low temperature performance, long storage time and wide operating temperature range. Therefore, supercapacitors have been widely used in many military and civilian energy storage fields such as 3c electronic products, power batteries, laser weapons and equipment, energy recovery systems, emergency power supplies, and national grids. [0003] At presen...

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Problems solved by technology

[0004] Such as CN101525760A discloses a kind of preparation supercapacitor RuO 2 The electrodeposition process of electrode materials, this method controls the electrodeposition process through the DC-differential pulse combined electrodeposition technology, prevents the film defects caused by hydrogen evolution in the early stage of precipitation, and improves the film growth rate, but this also leads to RuO 2 The reduction of hydration affects the diffusion of protons in the bulk phase of the material, thereby affecting the performance of the material, and this method needs to use noble metals such as tantalum or platinum as a matrix, which greatly increases the cost of the device, and at the same time has low yield and low yield. Small defects, and no electrochemical test results are given, it is difficult to prove its material performance advantages

CN102169759A discloses a kind of RuO 2 The preparation method of the electrode material, the method obtains the water and ruthenium oxide electrode material with excellent performance by controlling the water vapor concentration and the thermal decomposition temperature in the coating thermal decomposition process, the RuO prepared by this method 2 The material process is relatively complicated, and the prepared material has large internal stress and low adhesion strength. Due to the low water content in the reaction environment, the hydration content of the generated product is low, and it is easy to lose bound water during heat treatment to form anhydrous ruthenium dioxide

US patent US20110027977 discloses a RuO 2 The preparation method of the material, the method by using RuO 4 As a precursor of ruthenium, using an organic compound as a seed layer, and then depositing RuO on the seed layer 2 , the raw material RuO involved in this method 4 It is flammable and explosive, volatile and not suitable for storage, which leads to difficulties in production and operation, and the material contains an organic compound core, which affects the conductivity and electrochemical properties of the material

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