Oxygen Pressure Determination(1) S.J.T.U. Phase Transformation and Applications Zr02/Ca0 electrolyte 代表Zr艹离子 代表Ca2+离子 Conductor I I Conductor 代表0-离子 代表空位 Po2 P02 (Reference) (To be measured) 图7-10Z02晶格中在面心位置上 的一个Z4+被Ca2+置换的结构 Figure 6.7 Schematic diagram of an oxygen concentration cell. SJTU Thermodynamics of Materials Springl2008©X.J.Jin Lecture 11 Electrochemistry ll
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Springl 2008 © X. J. Jin Lecture 11 Electrochemistry II Oxygen Pressure Determination (1)
Oxygen Pressure Determination(2) S.J.T.U. Phase Transformation and Applications RT Zr02/Cao E=E°- Po2 electrolyte In- zF I Conductor I I Conductor E°=0 Po2 Po2 (Reference) (To be measured) RT E In zF Pos.ref Figure 6.7 Schematic diagram of an oxygen concentration cell. SJTU Thermodynamics of Materials Springl 2008 ©X.J.Jin Lecture 11 Electrochemistry ll
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Springl 2008 © X. J. Jin Lecture 11 Electrochemistry II Oxygen Pressure Determination (2) refO O P P zF RT EE , 2 2 −= ln o = 0 o E refO O P P zF RT E , 2 2 −= ln
Temperature dependence of voltage S.J.T.U. Phase Transformation and Applications △G=-EzF d(AG)=-ASdT--zFdE dE △S dE△S dT aF dT F △G=△H-TAS dE EzF=△H-TzF dT AH--F E-T4 -] SJTU Thermodynamics of Materials Springl2008©X.J.Jin Lecture 11 Electrochemistry Il
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Springl 2008 © X. J. Jin Lecture 11 Electrochemistry II ΔG = −EzF (Δ ) = Δ− SdTGd = −zFdE zF S dT dE Δ = zF S dT dEo o Δ = Δ = Δ − ΔSTHG dT dE −Δ=− TzFHEzF ⎥⎦⎤ ⎢⎣⎡ −−=Δ dTdE TEzFH ⎥⎦⎤ ⎢⎣⎡ −−=Δ dT dE TEzFH o o o Temperature dependence of voltage