Manipulating the Structure and Morphology of Cobalt-Boron Nanoparticles through a Chemical Approach

Abstract:

Cobalt-boron nanoparticles have been synthesized by a chemical reaction between NaBH₄ and CoCl₂.₆H₂O through manipulating pH value of the reaction mixture. The morphology, structure, phase composition, and thermal behavior have been examined via FESEM, TEM, XRD, EDS, and DSC techniques, respectively. It is demonstrated that the morphology and structure of ultimate nanoparticles completely depends on the pH value of reaction mixture. While the neutral pH value favors the smallest nanoparticles with a mean particle size of 50 nm and complete amorphous structure, the acidic condition promotes the growth process and the crystal structure. Furthermore, these nanoparticles transform into cobalt nanocrystallites after heated at 600°C, and retained the discrepancies in the morphology and the structure of the parent cobalt-boron nanoparticles. A detailed characterization of the nanoparticulates, discussions on the synthesis mechanism, and subsequent formation transformation have been provided.

• Periodical: Advanced Materials Research (Volume 829)
• Pages: 762-766
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.829.762
• Online since: November 2013
• Authors: Hooman Sabarou*, Abolghasem Ataie
• Keywords: Amorphous Materials, Chemical Synthesis, Electron Microscopy, Nanostructured Materials

References

[1] F. Gaucherand, E. Beaugnon, Magnetic texturing in ferromagnetic cobalt alloys, Physica B. 346/347 (2204) 262-266.

DOI: 10.1016/j.physb.2004.01.062

[2] H.X. Li, X.F. Chen, Selective hydrogenation of Cinnanaldehyde to Cinnamyl Alcohol over an ultrafine Co- B amorphous alloy catalysts, Appl Catal A: Gen. 225 (2002) 117- 130.

DOI: 10.1016/s0926-860x(01)00855-9

[3] Y.D. Wang, X.P. Qi, Electrochemical hydrogen storage behaviors of ultrafine amorphous Co- B alloy particles, Chem. Mater. 16 (2004) 5194- 5197.

DOI: 10.1021/cm049252f

[4] Z.Z. Yuan, D.P. Zhang, Preparation and magnetic properties of amorphous Co-Cu-B alloy nano- powders, Intermetallics. 17 (2009) 281- 284.

DOI: 10.1016/j.intermet.2008.07.015

[5] Z.Z. Yuan, J.M. Chen, Y. Lu, X.P. Chen, Preparation and magnetic properties of amorphous Co-Zr-B alloy nano- powders, J. Alloys Compd. 450 (2008) 245-251.

DOI: 10.1016/j.jallcom.2006.10.099

[6] B.H. Liu, Z.P. Li, S. Suda, Nickel- and Cobalt- based catalysts for hydrogen generation by hydrolysis of borohydride, J. Alloys. Compd. 415 (2006) 288-293.

DOI: 10.1016/j.jallcom.2005.08.019

[7] B.D. Cullity, S.R. Stock, Elements of X- Ray Diffraction, 2th ed, Addison Wesley, (2001).

[8] H. Li, Y. Wu, H. Luo, M. Wang, Y. Xu, Liquid phase hydrogenation of acetonitrite to ethylamine over the Co- B amorphous alloy catalysts, J. Catal. 214 (2003) 15- 25.

[9] G.N. Glavee, K.J. Klabunde, C.M. Sorensen, G.C. Hadjipanayis, Sodium borohydride reduction of cobalt ions in nonaqueous media, Inorg. Chem. 32 (1993) 474- 477.

DOI: 10.1021/ic00056a022

[10] A.K. Srivastava, S. Madhavi, A novel method to synthesis Cobalt Oxide (Co3O4) nanowires from Cobalt (Co) nanobowls, Phys. Status. Solidi A. 207 (2010) 963- 966.

DOI: 10.1002/pssa.200925503

[11] Chong-Hu Wu, Low energy-consumption industrial production of ultra-fine spherical cobalt powders, Energy Conservation, InTech., New York , 2012, pp.155-167.

DOI: 10.5772/52113

[12] A. Pozio, M. De Francesco, Apparatus for the production of hydrogen from sodium borohydride in alkaline solution, Int.J. Hydrogen Energy. 33 (2008) 51-56.

DOI: 10.1016/j.ijhydene.2007.08.024

[13] J. Andrieux, D. Swierezynski, A multifactor study of catalyzed hydrolysis of solid NaBH4 on Cobalt nanoparticles: thermodynamic and kinetics, Int. J. Hydrogen Energy. 34 (2009) 938- 951.

DOI: 10.1016/j.ijhydene.2008.09.102

[14] T. Cosgrove, Colloid Science: Principles, Methods, and Applications, Blackwell Publishing, Bristol, (2005).