探究用热力学方法计算电极电势的公式

Explore Formula of Calculated Electrode Potential with Thermodynamics Method

针对教材上利用热力学方法计算电极电势的两个公式φθ=[∑νBΔfGmθ(B)]/(nF)和E3θ=n1E1θn+3 n2E2θ的谬误,通过举例对两个公式进行了详细的推导。说明了φθ=[∑νBΔfGmθ(B)]/(nF)和只能用于失电子半反应计算标准电极电势,补充了对于得电子的半反应计算标准电极电势的公式φθ=ΔrGmθ(得电nF子半反应)=∑νBΔ(fnGFθm)(B)]。证明了在用表示电动势而用表示φ电极电势时,由同一元素的某些电对的电极电势求取另一电对的电极电势的公式为φ3θ=n1φ1θn+3 n2φ2θ。

For the error of two calculated electrode potential formula and φθ=[∑νBΔfGθm（B）]/（nF） and Eθ3=n1Eθ1＋n2Eθ2n3 with thermodynamics method in teaching material,the two formulas were derived in detail by examples.Explained formula φθ=[∑νBΔfGθm（B）]/（nF） calculated the standard electrode potential only for half-reaction of loss electronic,and added formula φθ=ΔrGθm（half-reaction of get electron）nF=∑νBΔfGθm（B）]（nF） calculated the standard electrode potential for the half-reaction of get electron.When denotes the electromotive force and φ express electrode potential,the formula was φθ3=n1φθ1＋n2φθ2n3 that was calculated electrode potential of the other electrode by the electrical potential of some electrodes of the same elements.