Effects of metal ions on Pt electrode dissolution in H2SO4 solution enhanced by the presence of H2O2
Effects of metal ions on Pt electrode dissolution in H2SO4 solution enhanced by the presence of H2O2
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DOI：
10.1063/1.4891641
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发表时间：
2014-07
影响因子：
2.5
通讯作者：
Hayato Itaya;S. Shironita;A. Nakazawa;M. Inoue;M. Umeda
中科院分区：
文献类型：
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作者：
Hayato Itaya;S. Shironita;A. Nakazawa;M. Inoue;M. Umeda
在Fe（Fe 2+，Fe 3+）、Ce（Ce 3+，Ce 4+）、Mn（Mn 2+）等金属离子的存在下，在含有H2 O2的0.5摩尔dm-3 H2SO 4中，进行Pt板电极的连续电位循环。首先，在没有任何金属离子的294 mmol dm-3 H2 O2 + 0.5 mol dm-3 H2SO 4中的电位循环证实了Pt电极的重量损失，这意味着Pt溶解。当向溶液中加入金属离子时，Pt电极在电位循环过程中的溶解非常显著;在Fe 2+和H2 O2的存在下，Pt重量急剧下降。此外，这种增强的Pt溶解取决于Fe 2+和H2 O2的浓度，并且在Fe 2+和H2 O2浓度分别为10和294 mmol dm−3时获得最大Pt重量损失（257 μg）。Pt溶解的Fe 2+和H2 O2浓度依赖性也与H2 O2的消耗速率相关。结果表明，Fe ~（2+）和H_2O_2协同促进了Pt的溶解。
Successive potential cycling of a Pt plate electrode was conducted in H2O2-containing 0.5 mol dm−3 H2SO4 in the presence of metal ions such as Fe (Fe2+, Fe3+), Ce (Ce3+, Ce4+), and Mn (Mn2+) ions. First, the potential cycling in 294 mmol dm−3 H2O2 + 0.5 mol dm−3 H2SO4 without any metal ions confirmed the weight loss of the Pt electrode, which implies Pt dissolution. When the metal ions were added to the solution, the Pt electrode dissolution during the potential cycling was very significant; the Pt weight sharply decreased in the presence of both Fe2+ and H2O2. In addition, this enhanced Pt dissolution depended on both the Fe2+ and H2O2 concentrations, and the maximum Pt weight loss (257 μg) was obtained at the Fe2+ and H2O2 concentrations of 10 and 294 mmol dm−3, respectively. The Fe2+ and H2O2 concentration dependences of the Pt dissolution also correlated with the consumption rate of H2O2. These results revealed that the Fe2+ and H2O2 synergically enhanced the Pt dissolution rate.