In case of nickel electrodeposition from mixed solvent baths, fine bubble evolution has been noticed. Actually, nickel metal deposition accompanies oxide/hydroxide surface layers which may catalyze HER.
plenty - see my papers with A.subramania,
plenty see all my papers with A.subramania, vasantha and malathy pushpavanam
if use a buffer you will not get hydroxides - use boric acid --
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Which solution reveals the microstructure and features of nickel-based alloys?
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