Thermodynamics Research Center / ThermoML | Thermochimica Acta

Thermal properties of alkaline sodium borohydride solutions

Liu, B. H.[Bin Hong], Li, Z. P.[Zhou Peng], Suda, S.
Thermochim. Acta 2008, 471, 1-2, 103-105
ABSTRACT
Alkaline sodium borohydride solutions are potential hydrogen sources for fuel cells. Thermal properties of theNaBH4 NaOH H2Oternary systemwere measured by DSC and temperature-rise calorimetry. Liquidus temperatures showed that it is possible to store and use the solutions well below 0 .C if NaOH concentration is less than 20 wt%. The solubility of sodium borohydridewas found to be large in these solutions, but decreased with increasing NaOH concentration. The optimum composition for alkaline borohydride solutions seems to be 15 wt% NaBH4 in 10 wt% NaOH considering both the liquidus temperature and hydrogen storage density.
Compounds
# Formula Name
1 HNaO sodium hydroxide
2 H2O water
3 BH4Na sodium tetrahydroborate
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 3
  • Molar heat capacity at constant pressure, J/K/mol ; Crystal
  • Temperature, K; Crystal
  • Pressure, kPa; Crystal
  • Crystal
  • Small sample (50 mg) DSC
  • 1
  • POMD
  • 1
  • 2
  • Solid-liquid equilibrium temperature, K ; Liquid
  • Mass fraction - 1; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal - 2
  • DTA
  • 3
  • POMD
  • 1
  • 2
  • Solid-liquid equilibrium temperature, K ; Liquid
  • Mass fraction - 1; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal of intercomponent compound 2
  • DTA
  • 3
  • POMD
  • 1
  • 2
  • 3
  • Solid-liquid equilibrium temperature, K ; Liquid
  • Mass fraction - 3; Liquid
  • Pressure, kPa; Liquid
  • Solvent: Mass fraction - 1; Liquid
  • Liquid
  • Crystal - 2
  • DTA
  • 2
  • POMD
  • 1
  • 2
  • 3
  • Solid-liquid equilibrium temperature, K ; Liquid
  • Mass fraction - 3; Liquid
  • Pressure, kPa; Liquid
  • Solvent: Mass fraction - 1; Liquid
  • Liquid
  • Crystal of intercomponent compound 1
  • DTA
  • 4
  • POMD
  • 1
  • 2
  • 3
  • Molar heat capacity at constant pressure, J/K/mol ; Liquid
  • Solvent: Mass fraction - 1; Liquid
  • Mass fraction - 3; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Small sample (50 mg) DSC
  • 14