OPTIMISATION OF TEFLON BONDED GAS EVOLVING ELECTRODES
In order to reduce the cost of catalyst preparation, traditional preparation methods other than freeze drying were studied: NiCo-2O-4 can be prepared by coprecipitating the mixed chlorides with KOH, (300 degrees C for 5 hours). Li-doped Co-3O-4 cannot be prepared by coprecipitation, a modified method, "slurry method" was devised. Co-3O-4 can be used as an efficient electrocatalyst when prepared in high surface area form. Electrochemical studies on Li-doped Co-3O-4 show instability at cathodic potentials for long periods. Oxygen evolution on the perovskite oxides La-0.5Sr-0.5CoO-3 and La-0.5Ca-0.5MnO-3 was studied to obtain the reversible potential for the oxygen evolution. NiO and Li-doped NiO was investigated as potential oxygen evolution catalyst. Oxygen evolution at high temperature was studied on NiCo-2O-4, Li-doped Co-3O-4 and Li-doped NiO. The superiority of Teflon bonded electrodes over thermally decomposed electrodes was looked into further. NiCo-2S-4, prepared by coprecipitation of nickel - cobalt nitrates with potassium polysulphide, was improved: by substituting Na-2S for potassium sulphide, comparable products could be obtained and the products do not catch fire. Full cell tests, using Teflon bonded Li-doped Co-3O-4 anodes and NiCo-2S-4 cathodes have been performed for over 6000 hours. As an alternative cathode catalyst the systems MoS-2 and its analogues were looked into.
Bibliographic Reference: EUR 9528 EN (1984) MF, 143 P., BFR 240, BLOW-UP COPY BFR 715, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989123100300 / Last updated on: 1987-01-01
Available languages: en