Abstract
Alpha nickel hydroxide has better performances than commercial beta nickel hydroxide. However, the main defect is that α-phase is difficult to synthesize and easily transformed to β-phase Ni(OH)2 upon aging in a strong alkaline solution. In this study, the Al-Co, Al-Yb, Yb-Co and Al-Yb-Co multiple doping was used respectively. By controlling the amount of sodium carbonate, the α-Ni(OH)2 was prepared by ultrasonic-assisted precipitation. And the influence of sodium carbonate on the crystalline phase and structure stability for alpha nickel hydroxide was studied. The results demonstrate that, with increasing amount, the biphase nickel hydroxide transforms to pure alpha nickel hydroxide gradually, and the structure stability is also improved. When the amount of sodium carbonate is 2 g, the sample still keeps α-Ni(OH)2 after being aged for 30 days, for Al-Yb-Co-Ni(OH)2. And when the amount is less than 2 g, the phase transformations exist in the samples with different extents. These results demonstrated that the amount of sodium carbonate is a critical factor to maintain the structural stability of α-Ni(OH)2.
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Funded by the National Natural Science Foundation of China (No.51604087), the Science and Technology Program of Guangdong Province of China (No.2016A010104019), and the Science and Technology Program of Guangzhou City of China (No. 201607010001)
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Zhao, T., Zhu, Y., Li, W. et al. Influence of Sodium Carbonate Amount on Crystalline Phase and Structure Stability for Doping Nickel Hydroxide. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 552–558 (2018). https://doi.org/10.1007/s11595-018-1859-z
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DOI: https://doi.org/10.1007/s11595-018-1859-z