Plastic-bound gas diffusion electrode containing a manganese oxi

Details Plastic-bound gas diffusion electrode containing a manganese oxi Plastic-bound gas diffusion electrode containing a manganese oxi

1988-06-23

1990-01-09

Niebling, John F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204294, 264104, 264105, 264127, 429 40, 429 42, C25B 1104, C25B 1106

Patent

active

048926370

ABSTRACT:
A process which comprises thermally decomposing in an electrically heated vibrating helical conveyor, manganese carbonate (MnCO.sub.3 x H.sub.2 O) into a manganese oxide (predominantly of Mn.sub.2 O.sub.3 x Mn.sub.5 O.sub.8) catalyst at about 500.degree. C., and processing this catalyst into a highly active electrode paste by dry intensive mixing with a carbon-containing conductive material (carbon black, graphite or activated carbon) and PTFE as the binder. The resulting electrode paste can be rolled into a supporting net made from Ni or Ag. Also a two-step mixing process in which the catalyst powder is first premixed with small amounts of a conductive agent and a binder, compacted and granulated, and then combined with the larger residual amount of the intended amounts of conductive agent and binder in a second mixing step. The finished gas diffusion electrode has a biporous structure consisting of hydrophilic and hydrophobic pore canals, which is highly favorable for the transport processes and the electrochemical reaction. The electrode is useful in fuel cells, alkali chloride electrolyzers and air cells.

REFERENCES:
patent: 3978007 (1976-08-01), Giglia et al.
patent: 4060476 (1977-11-01), Treptow et al.
patent: 4256545 (1981-03-01), Deborski
patent: 4269691 (1981-05-01), Deborski
patent: 4595643 (1986-06-01), Koshiba et al.

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