Electrochemical quartz crystal microbalance study of high-rate Pt dissolution in H2O2-containing H2SO4 solution with Fe2+ ion
Electrochemical quartz crystal microbalance study of high-rate Pt dissolution in H2O2-containing H2SO4 solution with Fe2+ ion
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DOI：
10.1016/j.ijhydene.2015.10.067
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发表时间：
2016-01
影响因子：
7.2
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
采用电化学石英晶体微天平（EQCM）研究了H2O2和Fe2+共存下Pt在H2SO4溶液中的溶解行为。EQCM数据表明，在含H2O2的H2SO4体系中，Pt在第4次循环后的1.36 → 0.36 V vs.RHE的阴极电位阶跃中发生了明显的溶解，而Fe2+的存在进一步促进了Pt的溶解。在Fe 2+的存在下，观察到的质量增加和质量损失直到第3次循环也更显著，这表明Pt电极表面的粗糙度显著增加。这一现象可能是由于H2O2的显著分解导致O2生成增加所致。结果表明，在H2O2和Fe2+共存的条件下，Pt原子重排形成了Pt氧化剂，促进了Pt的快速溶解。
Pt dissolution in an H2SO4solution was investigated in the presence of both H2O2and Fe2+using an electrochemical quartz crystal microbalance (EQCM). The EQCM data in the H2O2-containing H2SO4with and without Fe2+showed that a remarkable Pt dissolution occurred during the cathodic potential step of 1.36 → 0.36 V vs. RHE from the 4th cycle, which is further enhanced by the presence of Fe2+. The mass gains and mass losses observed up to the 3rd cycle were also more significant in the presence of Fe2+, suggesting that the roughness of the Pt electrode surface remarkably increased. This phenomenon may be caused by the enhanced O2generation due to the significant decomposition of H2O2. As a result, Pt oxidants inducing the cathodic Pt dissolution significantly form from the rearranged Pt atoms, which contribute to the high-rate Pt dissolution in the presence of both H2O2and Fe2+.