Polyaniline / Tungsten Carbide Composite Electrocatalyst
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- Category: Tungsten Information
- Published on Thursday, 26 October 2017 20:17
Tungsten carbide (WC) catalytic activity and electrochemical stability, antioxidant ability is very good, but the conductivity is poor.
This is the gap between it and the platinum, tungsten carbide is main reason for the composite with other materials.
In recent years, the synthesis of conductive polymer composites, especially between conductive polymers and inorganic particles, has attracted considerable interest. Conductive polymer composites are also one of the research focuses of materials. They have good application prospects in the fields of conductive materials, current materials and high-density information storage materials.
Polyaniline is a promising polymer in conductive polymers. It has special electrical and optical properties, and can be conductive and electrochemical after doping. The key is cheap raw material and good stability. Polyaniline and tungsten carbide composite can perfectly solve the main problem of insufficient conductivity of tungsten carbide.
A certain amount of WC ultrasonic dispersion in 25mL1mol/L sulfuric acid aqueous solution, adding 4.7ml aniline after high speed stirring 20 min, ammonium persulfate solution added a certain concentration (sulfuric acid solution 2.85g ammonium sulfate dissolved in 25mL in 1mol/L), polymerization of 6h at 20 °C, the reaction after filtration, followed by 0.2mol/L sulfuric acid solution and distilled water washed until the filtrate 10mL drop solution BaCl2 0.1mol/L to observe 2 drops of white precipitate so far. The filter cake was dried at 60 °C for 12h, which is sulfuric acid doped conductive polyaniline / tungsten carbide (PANI/WC) composite.
The polyaniline / tungsten carbide composite was tested in the most commonly used methanol battery solution, and the composite showed considerable stability in solution, with the addition of polyaniline, the electrical conductivity of tungsten carbide increased obviously (the highest conductivity was up to 5.45S/cm), and the crystal shape of WC did not change before and after polymerization in situ. Polyaniline in the composite is amorphous, which directly shows that polyaniline can greatly enhance the electrocatalytic properties of tungsten carbide under the premise of destroying the stability of tungsten carbide.
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