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Acta Chimica Sinica >

2012 , Vol. 70 >Issue 16: 1731 - 1736

DOI: https://doi.org/10.6023/A12070376

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Studies on the Growth Mechanism of Hydrothermal Synthesis of α-Ni(OH)2 Nanowires

  • Lu Yajun ,
  • Wang Haoran ,
  • Gu Yu ,
  • Xu Lan ,
  • Sun Xiaojun ,
  • Deng Yida
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  • State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240

Received date: 2012-07-06

  Online published: 2012-07-13

Supported by

Project supported by the National Natural Science Foundation of China (No. 51001075), Program of Shanghai Subject Chief Scientist (No. 11XD1402700), Following Research Project supported by the “Dawn” Program of Shanghai Education Commission (No. 10GG06).

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Abstract

SO42- ions and OH- ions play important roles in hydrothermal synthesis of Ni(OH)2 nanostructures with only inorganic nickel salt and NaOH. The whole process could be divided into 2 parts, the preparation of Ni(OH)2 gel and its hydrothermal reaction. According to our analysis, the former one is an ionic-reaction which produces amorphous Ni(OH)2. It is the later one when Ni(OH)2 gel crystallizes that dominates the polymorph and morphology of final products. The influence of OH- on morphologies of Ni(OH)2 has been studied by changing the ratio of n(SO42-)/n(OH-). To discuss the effect of SO42- ions in hydrothermal system on crystal growth, we wash the gel which is prepared by NiCl2 and NaOH with the mixture solution of Na2SO4 and NiSO4 for different times, so that Cl- ions in the gel solution could be replaced by SO42- ions in varying degrees. Then the nanosized Ni(OH)2 products is prepared by hydrothermal treatment. Also, the samples were characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). TEM results show that there will be 2 main nanostructures in different hydrothermal conditions: nanowires and nanosheets. XRD and FTIR results reveals that the nanowires is Ni(SO4)0.3(OH)1.4, one kind of α-Ni(OH)2, and the nanosheet is β-Ni(OH)2. We finally got a conclusion that low amount of OH- and pure SO42- environment is advantageous to synthesis of α-Ni(OH)2 nanowires. Since α-Ni(OH)2 is hydroxyl-deficient and consists of stacked Ni(OH)2-x layers toward which the SO42- ion has a higher affinity than other ions such as Cl- and SO42-, the SO42- ion is able to enter its interlayers. The structure is stabilized due to the strong coordination bonds between SO42- and Ni2＋ in Ni(OH)2-x layers. Also, free Ni2＋ ions in solution would be linked to intercalated SO42- through coordination bonds, so that new Ni(OH)2-x layers could form constantly and stack along the c-axis. As a result, there will be a preferential growth in the [001] direction. However, this process is not likely to continue when there is high amount of OH-, which may cause high Coulomb repulsion along the [001] direction.

Key words： hydrothermal synthesis; α-Ni(OH)2 nanowires; growth mechanism

Cite this article

Lu Yajun , Wang Haoran , Gu Yu , Xu Lan , Sun Xiaojun , Deng Yida . Studies on the Growth Mechanism of Hydrothermal Synthesis of α-Ni(OH)2 Nanowires[J]. Acta Chimica Sinica, 2012 , 70(16) : 1731 -1736 . DOI: 10.6023/A12070376

References

[1] Cui, J.-J.; Xia, X.; Liu, H.-T. Acta Chim. Sinica 2004, 62, 1595. (崔静洁, 夏熙, 刘洪涛, 化学学报, 2004, 62, 1595.)
[2] Chen, J.; Cheng, F.-Y. Acc. Chem. Res. 2009, 42, 713.  
[3] Chen, F.-B.; Wu, B.-R.; An, W.-F.; Yang, Z.-J.; Wu, F.; Chen, S. Electrochemistry 2010, 16, 39. (陈飞彪, 吴伯荣, 安伟峰, 杨照军, 吴峰, 陈实, 电化学, 2010, 16, 39.)
[4] Cui, J.-B.; Zhang, Y.; Wang, J.-X. New Technology & New Process 2010, (9), 81. (崔俊博, 张勇, 王晶星, 新技术新工艺, 2010, (9), 81.)
[5] Leng, Y.-J.; Zhang, J.-Q.; Cheng, S.-A.; Cao, C.-N. Acta Chim. Sinica 1998, 56, 557. (冷拥军, 张鉴清, 成少安, 曹楚南, 化学学报, 1998, 56, 557.)
[6] Li, W.-Y.; Cai, F.-S.; Gou, X.-L.; Gao, F.; Chen, J. Acta Chim. Sinica 2005, 63, 411. (李玮瑒, 蔡锋石, 苟兴龙, 高峰, 陈军, 化学学报, 2005, 63, 411.)
[7] Bernard, M. C.; Cortes, R.; Keddam, M.; Takenouti, H.; Bernard, P.; Senyarich, S. J. Power Sources 1996, 63, 247.  
[8] Watanabe, K.; Kikuoka, T. J. Appl. Electrochem. 1995, 25, 219.
[9] Yang, D.-N.; Wang, R.-M.; He, M.-S.; Zhang, J.; Liu, Z.-F. J. Phys. Chem. B 2005, 109, 7654.  
[10] Sun, H.-F.; Jiang, W.-Q.; Yu, L.-M.; Fu, Z.-Z.; Guo, R.-G.; Li, T.; Yang, H. Mater. Rev. 2011, 25, 49. (孙海峰, 蒋文全, 于丽敏, 傅钟臻, 郭荣贵, 李涛, 杨慧, 材料导报, 2011, 25, 49.)
[11] Liu, B.-H.; Yu, S.-H.; Chen, S.-F.; Wu, C.-Y. J. Phys. Chem. B 2006, 110, 4039.  
[12] Michael, R.; Kamath, P. J. Power Sources 1998, 70, 118.  
[13] Yang, D.-N.,; Wang, R.-M.; Zhang, J.; Liu, Z.-F. J. Phys. Chem. B 2004, 108, 7531.  
[14] Dong, L.-H.; Chu, Y.; Sun, W.-D. Chem. Eur. J. 2008, 14, 5064.  
[15] Sun, D.-H.; Zhang, J.-L.; Ren, H.-J.; Cui, Z.-F.; Sun, D.-X. J. Phys. Chem. C 2010, 114, 12110.  
[16] Uwe, K.; Christina, A.; Peter, B. J. Power Sources 2004, 127(1-2), 45.  
[17] Li, H.; Ma, J. J. Chem. Mater. 2006, 18, 4405.Newman, S. P.; Jones, W. New J. Chem. 1998, 22, 105.  
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