Abstract
Abstract Methods of increasing the efficiency and lowering the capital cost of state-of-the art pressure-type electrolyzers are briefly reviewed. A doubling of current density, accompanied by a halving of the internal resistance, and improved electrode activity are required. The latter may be obtained by catalysis and increases in effective surface area and temperature. An increase in the temperature to 120–130°C appears feasible without giving rise to materials problems provided asbestos separators are not used. All of the above are examined in detail, and it is shown that advanced electrodes with non-precious catalysts will be capable of operating at 1.55 V (I.R. included) at 0.4 A/cm2, 120 C and 30–40 atm., which corresponds to isothermal operation.
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