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Spherical copper (Cu) particles with an average particle size of ∼2 µm were coated with cobalt (Co) via electroless plating in an acid bath to prepare Co-coated Cu particles. The prepared particles maintained the initial core–shell structure even under heating up to 350°C in air. However, as the temperature exceeded 350°C, oxide phases of the Co3O4, CuO, and Cu2O phases were formed with microstructural change. Immediately after the oxidation of the Co shell, out-diffusion of the Cu core through the relatively porous cobalt oxide shell and copper oxidation occurred, thereby forming the outermost copper oxide shell. At 400°C, the copper oxide shell grew and the destruction of the cobalt oxide shell oxidised the edge region of an initial copper core. At the highest temperature of 600°C, a hole was formed at the centre of a particle due to excess out-diffusion of Cu.
References
-
-
1)
-
6. Chae, S.C., Murugavel, P., Lee, J.H., et al: ‘Growth and characterization of epitaxial barium titanate and cobalt ferrite composite film’, J. Korean Phys. Soc., 2005, 47, pp. 345–348 (doi: 10.3938/jkps.47.345).
-
2)
-
23. Haran, B.S., Popov, B.N., White, R.E.: ‘Studies on electroless cobalt coatings for microencapsulation of hydrogen storage alloys’, J. Electrochem. Soc., 1998, 145, (9), pp. 3000–3007 (doi: 10.1149/1.1838754).
-
3)
-
9. Xiaoding, X., Doesburg, E.B.M., Scholten, J.J.F.: ‘Synthesis of higher alcohols from syngas-recently patented catalysts and tentative ideas on the mechanism’, Catal. Today, 1987, 2, (1), pp. 125–170 (doi: 10.1016/0920-5861(87)80002-0).
-
4)
-
5. Hur, N., Park, S., Sharma, P.A., et al: ‘Electric polarization reversal and memory in a multiferroic material induced by magnetic fields’, Nature, 2004, 429, pp. 392–395 (doi: 10.1038/nature02572).
-
5)
-
14. Gautier, J.L., Trollund, E., Ríos, E., et al: ‘Characterization of thin CuCo2O4 films prepared by chemical spray pyrolysis. Study of their electrochemical stability by ex situ spectroscopic analysis’, J. Electroanal. Chem., 1997, 428, (1-2), pp. 47–56 (doi: 10.1016/S0022-0728(96)05072-3).
-
6)
-
19. Beekman, M., Salvador, J., Shi, X., et al: ‘Characterization of delafossite-type CuCoO2 prepared by ion exchange’, J. Alloys Compd., 2010, 489, (2), pp. 336–338 (doi: 10.1016/j.jallcom.2009.09.124).
-
7)
-
2. Caruso, F., Spasova, M., Susha, A., et al: ‘Magnetic nanocomposite particles and hollow spheres constructed by a sequential layering approach’, Chem. Mater., 2001, 13, (1), pp. 109–116 (doi: 10.1021/cm001164h).
-
8)
-
12. Bonchev, R., Zheleva, T., Sevov, S.C.: ‘Morphological and compositional characterization of copper-cobalt spinel made by mechanochemical reactions’, Chem. Mater., 1990, 2, (2), pp. 93–95 (doi: 10.1021/cm00008a003).
-
9)
-
13. Marsan, B., Fradette, N., Beaudoin, G.: ‘Physicochemical and electrochemical properties of CuCo2O4 electrodes prepared by thermal decomposition for oxygen evolution’, J. Electrochem. Soc., 1992, 139, (7), pp. 1889–1896 (doi: 10.1149/1.2069516).
-
10)
-
25. Birks, N., Meier, G.H.: ‘Introduction to high temperature oxidation of metals’ (Edward Arnold, London, 1983).
-
11)
-
16. DeKoninck, M., Poirier, S.-C., Marsan, B.: ‘CuxCo3−xO4 used as bifunctional electrocatalyst physicochemical properties and electrochemical characterization for the oxygen evolution reaction’, J. Electrochem. Soc., 2006, 153, (11), pp. A2103–A2110 (doi: 10.1149/1.2338631).
-
12)
-
4. Kimura, T., Goto, T., Shintani, H., et al: ‘Magnetic control of ferroelectric polarization’, Nature, 2003, 426, pp. 55–58 (doi: 10.1038/nature02018).
-
13)
-
22. Pearlstein, F., Weightman, R.F.: ‘Electroless cobalt deposition from acid baths’, J. Electrochem. Soc., 1974, 121, (8), pp. 1023–1028 (doi: 10.1149/1.2401971).
-
14)
-
15. Volkova, G.G., Yurieva, T.M., Plyasova, L.M., et al: ‘Role of the Cu-Co alloy and cobalt carbide in higher alcohol synthesis’, J. Mol. Catal. A, Chem., 2000, 158, (1), pp. 389–393 (doi: 10.1016/S1381-1169(00)00110-2).
-
15)
-
24. Berzins, T.: ‘Chemical reduction plating process and bath’, , 1967.
-
16)
-
21. Amri, A., Jiang, Z.-T., Zhao, X., et al: ‘Tailoring the physicochemical and mechanical properties of optical copper-cobalt oxide thin films through annealing treatment’, Surf. Coat. Technol., 2014, 239, pp. 212–221 (doi: 10.1016/j.surfcoat.2013.11.044).
-
17)
-
8. Angelov, S., Mehandjiev, D., Piperov, B., et al: ‘Carbon monoxide oxidation on mixed spinels CuxCo3−xO4(0≫x≫1) in the presence of sulphur compounds’, Appl. Catal., 1985, 16, (3), pp. 431–437 (doi: 10.1016/S0166-9834(00)84405-X).
-
18)
-
11. Baker, J.E., Burch, R., Golunski, S.E.: ‘Synthesis of higher alcohols over copper/cobalt catalysts: influence of preparative procedures on the activity and selectivity of Cu/Co/Zn/Al mixed oxide catalysts’, Appl. Catal., 1989, 53, (2-3), pp. 279–297 (doi: 10.1016/S0166-9834(00)80027-5).
-
19)
-
26. Hai, H.T., Takamura, H., Koike, J.: ‘Oxidation behavior of Cu–Ag core–shell particles for solar cell applications’, J. Alloys Compd., 2013, 564, pp. 71–77 (doi: 10.1016/j.jallcom.2013.02.048).
-
20)
-
20. Amri, A., Duan, X., Yin, C.-Y., et al: ‘Solar absorptance of copper-cobalt oxide thin film coatings with nano-size, grain-like morphology: optimization and synchrotron radiation XPS studies’, Appl. Surf. Sci., 2013, 275, pp. 127–135 (doi: 10.1016/j.apsusc.2013.01.081).
-
21)
-
18. Singh, D.J.: ‘Electronic and thermoelectric properties of CuCoO2: density functional calculations’, Phys. Rev. B, 2007, 76, p. 085110 (doi: 10.1103/PhysRevB.76.085110).
-
22)
-
7. Fujimoto, K., Oba, T.: ‘Synthesis of C1-C7 alcohols from synthesis gas with supported cobalt catalysts’, Appl. Catal., 1985, 13, (2), pp. 289–293 (doi: 10.1016/S0166-9834(00)81147-1).
-
23)
-
10. Fornasari, G., Gusi, S., Trifiro, F., et al: ‘Cobalt mixed spinels as catalysts for the synthesis of hydrocarbons’, Ind. Eng. Chem. Res., 1987, 26, (8), pp. 1500–1505 (doi: 10.1021/ie00068a002).
-
24)
-
17. Wociechowska, M., Zieliński, M., Malczewska, A., et al: ‘Copper-cobalt oxide catalysts supported on MgF2 or Al2O3-their structure and catalytic performance’, Appl. Catal. A, General, 2006, 298, pp. 225–231 (doi: 10.1016/j.apcata.2005.10.004).
-
25)
-
1. Oldenburg, S.J., Averitt, R.D., Westcott, S.L., et al: ‘Nanoengineeing of optical resonances’, Chem. Phys. Lett., 1998, 288, (2-4), pp. 243–247 (doi: 10.1016/S0009-2614(98)00277-2).
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