§76 Reversible cell 7.6.4 Reversible electrodes 1)The first-type electrode: amalgam electrode Gas electrode Zn(Hg),Izn2+(m, Pt丝 Hydrogen electrode Zn2+2e+xHg、Zn(Hg H2 Pt(s)h,(g, pe)lH() complex electrode Three-phase electrode Ag(s)lAg(Cn)2(mu: g Ag(Cn),+e Ag+2CN P片H+ solution( liquid) Pt foil (solid) Basic characteristics 1) Two phases /One interface 2)Mass transport: metal cations only 10 mold H+ solutionZn(Hg)xZn2+(m1 ): Ag(s)Ag(CN)2 (m1 ): amalgam electrode complex electrode Basic characteristics: 1) Two phases / One interface 2) Mass transport: metal cations only 1) The first-type electrode: Gas electrode: Three-phase electrode: H2 gas H+ solution (liquid) Pt foil (solid) Pt(s) H2 (g, p)H+ (c) Hydrogen electrode 1.0 mol·dm-3 H+ solution 7.6.4 Reversible electrodes §7.6 Reversible cell