DPt,H2(P)HCI(a)I HCI(a2)H2(P),Pt) ()H(P)-→2H(a1)+2e(a2>a) (+) 2H(a2)+2e一→H2(P) 总：2H(a2)一→2H(a) E=心m1nay 2F (a4*月 F (aH+)2 a==at 电池反应：H aac a=ai=dir E=一 (an)RT In(a.) RT F (aH*2 F (a±)1 2F 14 ①(-)Pt, H2 (P)│HCl(a1 )‖HCl(a2 )│H2 (P), Pt(+) (a2 > a1 ) 2 1 2 2 2 0 1 ( ) ( ) ( ) ( ) 2 + + + + = − = − H H H H a a Ln F RT a a Ln F RT E E 2 a = a H + a Cl − = a 电池反应：H + +  − H Cl a a 2 2 =  = + H a a a 1 2 1 2 2 1 ( ) 2 ( ) ( ) ( ) a a Ln F RT a a Ln F RT a a Ln F RT E H H = − = =   + + (-) H2 (P) —→ 2H+ (a1 )+2e (+) 2H+ (a2 ) + 2e —→ H2 (P) 总：2H+ (a2 ) —→ 2H+ (a1 )