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本文通过在碱溶液中Ti/RuO_2+TiO_2(A)和Ti/SnO_2+CuCo_2O_4(B)电极上氧阳极析出动力学的对比研究,表明这两类电极上氧的极化曲线均有两Tafel区。低极化区的Tafel斜率为0.039V(简称b_1区);高极化区为0.120V(简称b_2区)。在A电极上b_1区i～a_W·a_(OH~-);b_2区i～a_W(浓碱溶液)或i～a_(OH)~(0.1～0.5)(稀碱溶液),在B电极上b_1区i～a_(OH~-);b_2区i～a_(OH~-)~(0.39)(浓碱溶液);或i～a_(OH~-)(稀碱溶液),实验结果表明,虽然这两类电极上氧阳极析出过程都由第二电子转移步骤控制,但其机理不同,前者是由水分子参加,控制步骤为■后者则为■它们与PbO_2、Pt和低碳钢上机理有些不同。
In this paper, the comparison of the kinetics of oxygen anodic precipitation on Ti / RuO 2 TiO 2 (A) and Ti / SnO 2 + CuCo 2 O 4 (B) electrodes in alkaline solution shows that there are two Tafel zones . The Tafel slope of the low polarization zone is 0.039V (referred to as the b_1 zone for short), and the high polarization zone is 0.120V (the b_2 zone for short). In the b-electrode i ~ a_W · a_ (OH ~ -); b_2 i ~ a_W (concentrated solution) or i ~ a_ (OH) ~ (0.1 ~ 0.5) (OH ~ -) in b_1 area; i ~ a_ (OH ~ -) ~ (0.39) (concentrated alkali solution) or i ~ a_ (OH ~ Although both the anodic and anodic deposition processes on the two types of electrodes are controlled by the second electron transfer step, the mechanism is different. The former is composed of water molecules with the control steps of ■ the latter being ■ PbO_2, Pt and low carbon steel Somewhat different mechanism.