Determination of Standard Gibbs Energy of Formation of Ni₃B₂O₆ by Electromotive Force Measurement Using Solid Electrolyte

Abstract

  The standard Gibbs energy of formation of Ni₃B₂O₆ were determined by measuring electromotive forces of the galvanic cell using an Y₂O₃-stabilized ZrO₂ solid electrolyte (YSZ(8)). Ni₃B₂O₆ was prepared by the spray drying method. The cell constructed for measuring the emf was as follows:
Pt|Ni, Ni₃B₂O₆, B₂O₃|YSZ(8)|O₂ in air|Pt.
The electromotive forces of this cell (E/V) were measured as a function of temperature (T/K) as follows:
E=1.214-4.522×10^-4 T±2×10^-3,
where temperature range was 1193~1393 K. Using this emf, the standard Gibbs energy of formation of Ni₃B₂O₆ (Δ_fG^o(Ni₃B₂O₆)/J•mol^-1) was calculated as follows:
Δ_fG^o(Ni₃B₂O₆)=-1934000+455.6T±1000
where the standard pressure is 1 bar (100 kPa).