The effect of particle size on electrode reaction thermodynamics of nano-Bi2O3 electrode

As an electrode material, the many excellent properties of nano-Bi 2 O 3 have been researched. However, the influences of particle size on the electrode reaction thermodynamic properties of nano-Bi 2 O 3 electrode are not clear. In this paper, the effect of particle size on electrochemical thermodynamic functions of nano-Bi 2 O 3 electrode was analyzed theoretically. In experiment, the spherical nano-Bi 2 O 3 with different particle sizes and the corresponding nano-Bi 2 O 3 electrodes were prepared, then the temperature coefficients of nano-Bi 2 O 3 electrodes and the thermodynamic functions of the electrode reaction were obtained by measuring the electrode potentials of nano-Bi 2 O 3 electrodes with different particle sizes at different temperatures. The experimental results show that the particle size has significant influence on the thermodynamic properties of nano-Bi 2 O 3 electrode, the standard electrode potentials and the equilibrium constants increase with the particle size decreases, while the temperature coefficient, the mole Gibbs energy change, the mole enthalpy change and the mole entropy change reduce. In addition, these physical quantities are all linearly related with the reciprocal of average particle size when the radius exceeds 10 nm. The experimental regularities are consistent with the theoretical analysis.