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Aqueous-alkaline NaBH4 solution: The influence of storage duration of solutions on reduction and activity of cobalt catalysts

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  • Netskina, O.V.
  • Komova, O.V.
  • Simagina, V.I.
  • Odegova, G.V.
  • Prosvirin, I.P.
  • Bulavchenko, O.A.

Abstract

Changes in the physicochemical properties of aqueous-alkaline solutions of sodium borohydride upon prolong storage have been studied. It was shown that in solutions water slowly interacts with the hydride to produce sodium tetrahydroxoborate which precipitates as NaB(OH)4·2H2O. The effect of NaBH4 decomposition in aqueous-alkaline solutions on the in situ reduction of cobalt chloride has been investigated. It was found that sodium tetrahydroxoborate interacts with cobalt chloride to form purple amorphous cobalt borate which is reduced by NaBH4 to an active catalyst. The properties of the active components in freshly prepared solutions and in solutions after a one-year storage have been compared using HR TEM, XPS and IR spectroscopy. It was found that with the decreasing content of NaBH4 there was a decrease in the extent of reduction of the catalyst precursors while the increase in the pH of up to 13 leads to the formation of cobalt hydroxide which has low activity towards hydrolysis.

Suggested Citation

  • Netskina, O.V. & Komova, O.V. & Simagina, V.I. & Odegova, G.V. & Prosvirin, I.P. & Bulavchenko, O.A., 2016. "Aqueous-alkaline NaBH4 solution: The influence of storage duration of solutions on reduction and activity of cobalt catalysts," Renewable Energy, Elsevier, vol. 99(C), pages 1073-1081.
    • Handle: RePEc:eee:renene:v:99:y:2016:i:c:p:1073-1081
    DOI: 10.1016/j.renene.2016.08.005
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    References listed on IDEAS

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    1. Kim, Taegyu, 2014. "NaBH4 (sodium borohydride) hydrogen generator with a volume-exchange fuel tank for small unmanned aerial vehicles powered by a PEM (proton exchange membrane) fuel cell," Energy, Elsevier, vol. 69(C), pages 721-727.
    2. Santos, D.M.F. & Sequeira, C.A.C., 2011. "Sodium borohydride as a fuel for the future," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 3980-4001.
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    1. Netskina, O.V. & Tayban, E.S. & Prosvirin, I.P. & Komova, O.V. & Simagina, V.I., 2020. "Hydrogen storage systems based on solid-state NaBH4/Co composite: Effect of catalyst precursor on hydrogen generation rate," Renewable Energy, Elsevier, vol. 151(C), pages 278-285.
    2. Olga V. Netskina & Elena S. Tayban & Anna M. Ozerova & Oxana V. Komova & Valentina I. Simagina, 2019. "Solid-State NaBH 4 /Co Composite as Hydrogen Storage Material: Effect of the Pressing Pressure on Hydrogen Generation Rate," Energies, MDPI, vol. 12(7), pages 1-7, March.
    3. Helder X. Nunes & Diogo L. Silva & Carmen M. Rangel & Alexandra M. F. R. Pinto, 2021. "Rehydrogenation of Sodium Borates to Close the NaBH 4 -H 2 Cycle: A Review," Energies, MDPI, vol. 14(12), pages 1-28, June.

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