Abstract

Use of porous electrodes in electrolysis modules permits high current density operation at reduced cell voltages because the specific surface area in porous electrodes increases manyfold due to fine pores and large pore densities. But the use of porous electrodes also imposes certain restrictions in design and operation of the module. The increased current densities causes high heat and gas generation fluxes within a small cell space, with the gases being released in the form of very fine bubbles. These factors give rise to opposing demands on the fluid flow within the module and to the gas separator, affecting their sizes. The diaphragm has to be very thin to minimize the ohmic drop at high current densities and also should effectively prevent the cross leakage of gases released from the porous electrodes. The above aspects are discussed in detail and the experimental studies carried out on the porous nickel electrodes to determine the bubble size, gas release and separation at different current densities are reported. Description of an electrolyser of 1.5 Nm 3/h capacity and operation of the module with porous electrodes are given. A brief note on the economic aspects of the module, using porous electrodes, is included.

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