Effect of hypophosphite on electrodeposition of graphite@copper powders

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• 作者：Yujiao Chu^a ; Gang Yu^a ; ^{yuganghnu@163.com" class="auth_mail} ; Bonian Hu^b ; Qizhi Dong^a ; Jun Zhang^a ; Xueyuan Zhang^a
• 关键词：Graphite powders ; Electrodeposition ; Copper ; Sodium hypophosphite ; Mechanism
• 刊名：Advanced Powder Technology
• 出版年：March, 2014
• 年：2014
• 卷：25
• 期：2
• 页码：477-482
• 全文大小：1500 K

文摘

The effect of sodium hypophosphite (NaH₂PO₂) on the electrodeposition of copper coated graphite powders (graphite@Cu) was investigated in this paper. The cathodic polarization curves were determined by potentiodynamic scanning method in the electrolyte containing various concentrations of NaH₂PO₂. Hypophosphite could reduce the overpotential of copper deposited on the graphite particles surface and accelerate electroless copper nuclei generated by the reduction reaction. The applied potential promoted the formation of copper nuclei on the surface of graphite powders. Uniform graphite@Cu powders were fabricated by optimizing the NaH₂PO₂ concentration in the range of 10-15 g dm^鈭?. The residue of NaH₂PO₂ could be depleted to less than 0.25 g dm^鈭? by decomposition on the anode and chemical reduction in the bath during electrodeposition. The effect of hypophosphite on the electrodeposition of graphite@Cu is also discussed.