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用分解极化曲线法研究了在 0 .1 mol/ L Cr2 ( SO4) 3+1 mol/ L Na2 SO4+0 .2 mol/ L H2 SO4溶液中 Pt和Pb O2 电极上 Cr2 O2 - 7阳极形成和 O2 析出过程中温度的影响 .实验结果表明 ,在 1 .95V下 ,Pt电极上 O2 和Cr2 O2 - 7的表观活化能分别为 57.4 k J/ mol和 61 .3 k J/ mol;Pb O2 电极上 O2 和 Cr2 O2 - 7表观活化能分别为 4 0 .2 k J/mol和 4 6.2 k J/ mol.温度对于 Cr2 O2 - 7形成的加速作用要大于对 O2 析出的加速作用 ,当温度升高时 ,使 Cr2 O2 - 7的电流效率提高 .固定温度和固定电位下 Pb O2 上 O2 析出速度较之 Pt电极上增加不大 ,但 Cr2 O2 - 7形成速度远比 Pt电极上大 ,可见 Pb O2 电极对于 Cr2 O2 - 7的阳极形成具有较高的催化活性 .
The decomposition polarization curve was used to study the formation of Cr2 O2 - 7 anode on Pt and Pb O2 electrodes in 0.1 mol / L Cr2 (SO4) 3 + 1 mol / L Na2 SO4 + 0.2 mol / L H2 SO4 And the temperature during O2 precipitation.The experimental results show that the apparent activation energies of O2 and Cr2 O2 - 7 on Pt electrode are 57.4 kJ / mol and 61.3 kJ / mol respectively at 1 .95V; Pb The apparent activation energies of O2 and Cr2 O2 - 7 on the O2 electrode were 40.2 kJ / mol and 42.6 kJ / mol, respectively. The accelerating effect of temperature on the formation of Cr2 O2 - 7 was greater than that on the O2 precipitation, When the temperature rises, the current efficiency of Cr 2 O 2 - 7 increases, and the deposition rate of O2 on Pb O2 at a fixed temperature and a fixed potential does not increase much compared with that on the Pt electrode. However, the formation speed of Cr 2 O 2 - 7 is much faster than that of the Pt electrode , It can be seen that the Pb O2 electrode has high catalytic activity for the anode formation of Cr2 O2 - 7.