Tungsten Carbide Electrode Manufacturing

At present, the fuel cells usually use Pt / C catalyst or Pt alloy catalyst as the oxygen reduction catalyst, but Pt and its alloy is expensive and lack of resources, which greatly limits its application range. Tungsten carbide electrode is a non-noble metal catalyst and the catalytic property is similar with platinum and has CO poisoning resistance, so it as catalyst used in electrochemistry field is more and more widely.

Tungsten carbide electrode manufacturing:
1. Weighed a certain amount of ammonium paratungstate (APT) to make 10% aqueous solution, placed aqueous solution into spray drying apparatus at room temperature for spray-drying microspheres treatment can obtain ammonium paratungstate powder.
2. Placed ammonium metatungstate powder in quartz boat of tube type resistance furnace leads to mixed gas of H₂ and CO (H₂ as reducing gas and CO as carbon source). And then the furnace temperature was raised to 400 ℃, heat preservation for 1~2 hours, then heated to 900 ℃heat preservation for 6 ~7 hours.
3. After reaction finished, leads to N2 with naturally cooling to obtain tungsten carbide (WC).
4.Catalyst layer production: Uniform mixed WC, activated carbon, polytetrafluoroethylene emulsion (60%) by 10: 1: 3 proportion, added appropriate absolute ethyl alcohol for 5 minutes ultrasonic dispersion and then placed in 80℃ water to heat with stirring makes the mixture to reunite. Placed the aggregate on two-roll mill repeatedly rolling to film, its thickness is 0.2mm.
5. Waterproof layer preparation: uniform mixed acetylene black, anhydrous sodium sulfate and PTFE by 1: 1: 1 mass ratio, and then follow the steps of catalyst layer production process to obtain waterproof layer, its thickness is approximately 0.2mm.
6. To superpose breathable waterproof layer, catalyst layer and current collector layer by layer and pressed on hydraulic machine 10MPa to obtain tungsten carbide gas diffusion electrode.

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