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NonstoichiometriC, anhydrous NiO~ thin films were produced by sputtering. They can be bleached by means of hydrogen insertion equally fast and efficiently either in an electrochemical cell or in a gas chamber, as demonstrated in this work by using a Pd covered thin film electrode. The electrode mechanical stress and transmittance changes during H insertion and extraction, measured in situ, showed an increase in the compressive stress in the cathodic (bleaching) cycle