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http://dx.doi.org/10.4313/JKEM.2014.27.9.582

Addition Effects of Sheet-like Ni Nanopowder on the Electrochemical Properties of Positive Electrode in Ni-Zn Redox Flow Battery  

Seok, Hye-Won (Electronic materials & Module Team, Koewa Institute of Ceramics Engineering and Technology)
Kim, Sei-Ki (Electronic materials & Module Team, Koewa Institute of Ceramics Engineering and Technology)
Kang, Yang-Koo (Electronic materials & Module Team, Koewa Institute of Ceramics Engineering and Technology)
Hong, Yeon-Woo (Electronic materials & Module Team, Koewa Institute of Ceramics Engineering and Technology)
Lee, Young-Jin (Electronic materials & Module Team, Koewa Institute of Ceramics Engineering and Technology)
Kim, Beom-Su (Vitzrocell)
Ju, Byeong-Kwon (Display and Nanosystem Lab., Korea University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.27, no.9, 2014 , pp. 582-588 More about this Journal
Abstract
3 mol% Co-added $Ni(OH)_2$ fine powders, which showed ${\beta}$-phase, as positive electrode materials have been fabricated using $NiSO_4{\cdot}6H_2O$ aqueous solution by ultrasonic spray-chemical precipitation and subsequent hydrothermal method, and sheet-like Ni nanopowder was fabricated by mechano-chemical reduction method. The addition effects of the sheet-like Ni nanopowder on the electrochemical properties of the positive electrode in Ni-Zn Redox flow battery were investigated. Impedance spectroscopy revealed that the addition of the sheet-like Ni nanopowder resulted in decrease in the electrical resistivity; 10 wt.% addition reduced the electrical properties by a fifth. Cyclic voltammetry showed the addition of the sheet-like Ni nanopowder resulted in decrease in the potential difference of oxidation and reduction; this means the increase in the reversability for electrode reduction. Charge/discharge measurement confirmed that the addition of the sheet-like Ni nanopowder resulted in the increase in the discharge efficiency.
Keywords
Ni-Zn Redox flow battery; Sheet-like Ni; Co-added $Ni(OH)_2$; Impedance spectroscopy;
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