Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)To evaluate promising anode, cathode, and separator materials in conditions similar to those present in a full-size water electrolyser, a test cell with electrode area of 10 cm2 was constructed. In order to operate with current densities as high as 1A cm-2 a 10 A pulsed galvanostat was developed and built which features a 'sample-hold' circuit to measure the IR-free electrode overvoltages and direct meter readings. © 1983 Chapman and Hall Ltd.1333713762010/05389-5; FAPESP; São Paulo Research FoundationFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)