In-Situ Monitoring of Preferential Dissolution of Pt-50at.%Fe Alloy under Potential Cycling in 0.5 M H2SO4 Solution Using a Channel Flow Triple Electrode
In-Situ Monitoring of Preferential Dissolution of Pt-50at.%Fe Alloy under Potential Cycling in 0.5 M H2SO4 Solution Using a Channel Flow Triple Electrode
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DOI：
10.1149/2.0931614jes
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发表时间：
2016
影响因子：
3.9
通讯作者：
Azusa Ooi;E. Tada;A. Nishikata
中科院分区：
文献类型：
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作者：
Azusa Ooi;E. Tada;A. Nishikata
采用通道流三电极（CFTE）对Pt-50 at.%（质量分数）上优先溶解的Fe 2+和Fe 3+进行了原位检测Fe合金在0.5MH2SO4溶液中的循环电位作用. CFTE由Pt-50 at.% Fe合金工作电极（PtFe-WE）和两个分开的Au集电极（Au-CE）分别放置在通道的上游和下游。当使用不同浓度的FeSO 4和Fe 2（SO 4）3溶液时，Au-CEs检测Fe 2+和Fe 3+的最佳电位分别为1.0和0 V（相对于标准氢电极）。当PtFe WE在0.05 ~ 1.4V之间进行电位循环时，在0.25 ~ 0.75V之间阳极扫描和阴极扫描时，Fe以Fe 2+形式溶解;在1.1V以上和0.9 ~ 0.5V之间阴极扫描时，Fe主要以Fe 3+形式溶解。
A channel flow triple electrode (CFTE) was employed for the in-situ detection of Fe 2+ and Fe 3+ preferentially dissolved from a Pt–50at.% Fe alloy under potential cycles in a 0.5 MH 2 SO 4 solution. The CFTE consisted of a Pt–50at.% Fe alloy working electrode (PtFe-WE) and two split Au collector electrodes (Au–CE) placed upstream and downstream in a channel, respectively. The optimum potentials for detecting Fe 2+ and Fe 3+ on the Au–CEs were determined to be 1.0 and 0 V vs. a standard hydrogen electrode, respectively, when using solutions of different concentrations of FeSO 4 and Fe 2 (SO 4) 3. When PtFe–WE was potential-cycled between 0.05 and 1.4 V, Fe dissolved as Fe 2+ between 0.25 and 0.75 V in both anodic and cathodic scans, and mainly dissolved as Fe 3+ above 1.1 V and from 0.9 to 0.5 V in cathodic scans.