(1. 浙江大學 化學系， 杭州 310027；
2. 中國科學院 金屬研究所
金屬腐蝕與防護國家重點實驗室， 沈陽 110015)
摘 要: 采用絡合沉淀、 并行低速加料法制備了Al取代和Al與Zn復合取代α-Ni(OH)2樣品， 研究了其結構、 表面形貌和電化學性能。 結果表明：用該種方法制備的α-Ni(OH)2顆粒呈規(guī)則的球形且表面粗糙;與Al單獨取代α-Ni(OH)2相比， Al與Zn復合取代α-Ni(OH)2顆粒的球形度和活化性能有所降低， 放電電位和循環(huán)穩(wěn)定性有所提高。 α-Ni(OH)2的紅外光譜、 X射線衍射及樣品電極的電化學阻抗譜測試結果表明， 復合添加Al和Zn提高了氫氧化鎳的結構穩(wěn)定性， 降低了顆粒的微晶尺寸和電極反應的電荷轉移電阻。
關鍵字: α-Ni(OH)2； 結構； 表面形貌； 電化學性能
XIAO Hui-ming1, ZHANG Jian-qing1, 2
（1. Department of Chemistry,
Zhejiang University, Hangzhou 310027, China;
2. State Key Laboratory for Corrosion and Protection,
Institute of Metal Research, The Chinese Academy of Sciences,
Shenyang 110015, China）
Abstract:Al-substituted α-Ni(OH)2, Al and Zn co-substituted α-Ni(OH)2 were prepared by a complexation precipitation and parallel slow feeding method, and their structure, morphology and electrochemical performance were studied. The experimental results show that the α-Ni(OH)2 particles display spherical shape and rough surface. The sphericity and activation performance of Al and Zn co-substituted α-Ni(OH)2 are lower than those of Al-substituted α-Ni(OH)2, however, the half discharge potential and the cycling stability are higher. The results of Fourier transform infrared spectroscopy (IR), X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS) show that the co-doping of Al and Zn increases the structural stability and decreases the crystallite size and the charge transfer resistance.
Key words: α-Ni(OH)2； structure； morphology； electrochemical performance
