(1. 浙江大學(xué) 化學(xué)系， 杭州 310027；
2. 中國(guó)科學(xué)院 金屬研究所
金屬腐蝕與防護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室， 沈陽(yáng) 110015)
摘 要: 采用絡(luò)合沉淀、 并行低速加料法制備了Al取代和Al與Zn復(fù)合取代α-Ni(OH)2樣品， 研究了其結(jié)構(gòu)、 表面形貌和電化學(xué)性能。 結(jié)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(dú)取代α-Ni(OH)2相比， Al與Zn復(fù)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(xué)阻抗譜測(cè)試結(jié)果表明， 復(fù)合添加Al和Zn提高了氫氧化鎳的結(jié)構(gòu)穩(wěn)定性， 降低了顆粒的微晶尺寸和電極反應(yīng)的電荷轉(zhuǎn)移電阻。
關(guān)鍵字: α-Ni(OH)2； 結(jié)構(gòu)； 表面形貌； 電化學(xué)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
