Electrodeposition of catalytically active nickel powder from sulphate baths: Effect of some operating variables

Surface Technology Pub Date : 1985-12-01 DOI:10.1016/0376-4583(85)90097-4

A.M. Abd El-Halim , R.M. Khalil

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引用次数: 7

Abstract

Fine-grained nickel powder has been successfully electrodeposited from a very dilute all-sulphate bath of the composition 0.0125 moll⁻¹ NiSO₄ · 7H₂O, 0.23 moll⁻¹ (NH₄)₂SO₄, 0.1 moll⁻¹ H₃BO₃ and 0.07moll⁻¹ Na₂SO₄ · 10H₂O. 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% H₂O₂ 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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硫酸盐浴电沉积催化活性镍粉:一些操作变量的影响

在0.0125 moll−1 NiSO4·7H2O、0.23 moll−1 (NH4)2SO4、0.1 moll−1 H3BO3和0.07moll−1 Na2SO4·10H2O组成的极稀全硫酸盐浴中成功电沉积了细粒镍粉。研究发现，电解过程的电流效率和表面形貌以及电沉积镍粉对0.4% H2O2溶液分解的催化活性受到pH、电流密度和电解时间等操作变量的根本影响。x射线衍射研究表明，镍粉没有氧化物和氢氧化物污染。在最佳操作条件下(pH = 7.7 j = 13.3 A dm−2,t = 10 min)，所选择的镀液产生的镍镀层的催化活性接近100%，沉积效率约为18%。

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Surface Technology

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