Electrolytic Production of Nickel-Cobalt Magnetic Alloys from Solid Oxides in Molten Carbonates. Issue 13 (1st January 2017)

• Record Type: Journal Article
• Authors: Zheng, Kaiyuan; Cheng, Xinhua; Dou, Yanpeng; Zhu, Hua; Wang, Dihua
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 13(2017)
• Page Start: E422
• Page End: E427
• Publication Date: 2017-01-01
• Subjects: molten slat electrochemistry -- nickel-cobalt alloy -- solid-state reduction; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1141713jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Nickel-cobalt (Ni–Co) alloy was prepared by electrochemical reduction of solid NiO and Co3 O4 powder in molten Na2 CO3 -K2 CO3 melt at 750°C. Cyclic voltammetry (CV) and potentiostatic electrolysis experiments indicate that the electroreduction experiences an initial rapid reduction of Co3 O4 to CoO, followed by a further co-reduction of NiO and CoO to Ni-Co alloy. The metallic Ni-Co powder was obtained either by potentiostatic electrolysis at potential more negative than −1.25 V (vs. Ag/Ag2 SO4 ) or by constant cell voltage electrolysis at above 1.7 V. An oxide-layer-covered Ni11Fe10Cu alloy rod serving as an inert anode for oxygen evolution behaved stably and reliably for long-term operation. Ni and Co distributed uniformly in the product. The morphology and crystal phase of the alloy was significantly influenced by the electrolysis time. Furthermore, the obtained Ni-Co powders were typical ferromagnetic alloy with relatively high saturation magnetization.