Preparation of the Nano Cobalt Powder by Wet Chemical Reduction Method

Hyun-Seon Hong; Young-Dae Ko; Lee-Seung Kang; Geon-Hong Kim; Hang-Chul Jung

doi:10.4150/KPMI.2011.18.3.244

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액상환원공정을 이용한 나노 코발트 분말의 합성: 홍현선, 고영대, 강이승, 김건홍, 정항철
Preparation of the Nano Cobalt Powder by Wet Chemical Reduction Method: Hyun-Seon Hong, Young-Dae Ko, Lee-Seung Kang, Geon-Hong Kim, Hang-Chul Jung; Journal of Korean Powder Metallurgy Institute 2011;18(3):244-249
DOI: https://doi.org/10.4150/KPMI.2011.18.3.244

¹고등기술연구원 플랜트엔지니어링센터
²고등기술연구원 플랜트엔지니어링센터
³고등기술연구원 플랜트엔지니어링센터
⁴고등기술연구원 플랜트엔지니어링센터
⁵고등기술연구원 플랜트엔지니어링센터
¹Plant Engineering Center, Institute for Advanced Engineering(IAE)
²Plant Engineering Center, Institute for Advanced Engineering(IAE)
³Plant Engineering Center, Institute for Advanced Engineering(IAE)
⁴Plant Engineering Center, Institute for Advanced Engineering(IAE)
⁵Plant Engineering Center, Institute for Advanced Engineering(IAE)

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Abstract

Spherical nanosized cobalt powder with an average size of 150-400 nm was successfully prepared at room temperature from cobalt sulfate heptahydrate (CoSO_4cdot7H_2O). Wet chemical reduction method was adopted to synthesize nano cobalt powder and hypophosphorous acid (H_3PO_2) was used as reduction agent. Both the HCP and the FCC Co phase were developed while CoSO_4cdot7H_2O concentration ranged from 0.7 M to 1.1 M. Secondary phase such as Co(OH)_2 and CO_3O_4 were also observed. Peaks for the crystalline Co phase having HCP and FCC structure crystallized as increasing the concentration of H_3PO_2, indicating that the amount of reduction agent was enough to reduce Co(OH)_2. Consequently, a homogeneous Co phase could be developed without second phase when the H_3PO_2/CoSO_4cdot7H_2O ratio exceeded 7.

Keywords: Nano cobalt powder;Cobalt sulfate;Wet chemical reduction;Hypophosphorous acid;

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