E(Ni+Ni)=-0.25V E([ed2/Pd)=+09V E(P2+Pt)=+1.2V估计值) E(Zn2/Zn)=-0763V E(Cd2Cd)=-0.403V E(Hg2/Hg)=+0854V 总趋势:从上到下活泼性降低( ) ( ) (Pt /Pt) 1.2V( ) Pd /Pd 0.92V N i /Ni 0.25V 2 2 2 = + 估计值 = + = − + + + E E E ( ) ( ) (Hg /Hg) 0 854V Cd /Cd 0 403V Zn /Zn 0 763V 2 2 2 E . E . E . = + = − = − + + + 总趋势：从上到下活泼性降低