Platinum black

It is used in many ways; as a thin film electrode, a fuel cell membrane catalyst, or as a catalytic ignition of flammable gases for "self-lighting" gas lamps, ovens, and stove burners.

Platinum black powder is used as a catalyst in proton-exchange membrane fuel cells.

In common practice, the platinum black is either sprayed using an ultrasonic nozzle or hot-pressed onto the membrane or gas diffusion layer.

[2] Platinization is often conducted from water solution of 0.072 mol/kg of chloroplatinic acid and 0.00013 mol/kg of lead acetate, at a current density of 30 mA/cm2 for up to 10 minutes.

[2] Another author[1] recommends electroplating with the current density of 5 mA/cm2 while reversing the polarity every 30 seconds for 15 minutes.

[3][4][5][6] When the platinum black did not adhere to the cathode, they found that adding around 1% copper sulfate to the chloroplatinic acid in the electrolyte improved the results.