Abstract
Fine-grained nickel powder has been successfully electrodeposited from a very dilute all-sulphate bath of the composition 0.0125 moll −1 NiSO 4 · 7H 2O, 0.23 moll −1 (NH 4) 2SO 4, 0.1 moll −1 H 3BO 3 and 0.07moll −1 Na 2SO 4 · 10H 2O. The current efficiency of the deposition process and the surface morphology, as well as the catalytic activity of the electrodeposited nickel powder towards the decomposition of 0.4% H 2O 2 solution, were found to be fundamentally influenced by the operating variables pH, current density and duration of the electrolysis. X-ray diffraction studies revealed that the nickel powder is free from oxide and hydroxide contaminations. Under the optimum operating conditions ( pH = 7.7 j = 13.3 A dm −2 and t = 10 min) the selected bath produced a nickel deposit characterized by catalytic activity approaching 100% with a deposition efficiency around 18%.
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