Electrochemical properties and application of mixed silver-bismuth electrodes
Electrochemical properties and application of mixed silver-bismuth electrodes
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DOI：
10.1002/elan.200503328
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发表时间：
2005-11-01
期刊：
影响因子：
3
通讯作者：
Schroder, KH
中科院分区：
文献类型：
--
作者：
Skogvold, SM;Mikkelsen, O;Schroder, KH
采用循环伏安法（CV）、微分脉冲伏安法（DPV）和电化学交流阻抗法（EIS）系统地研究了含铋2、4、6、10和15%的银电极的电化学性能。随着铋添加量的增加，析氢反应过电位增加。在酸性溶液中，在混合电极上成功检测到锌，但在纯银电极上检测失败。通过循环伏安法研究了在不同电极表面上形成的氧化物产物的形成和分解，并且除了在银上发现的已知物种之外，还实现并检查了归因于铋的峰。在低μ g/L范围内，锌、镉和铅在混合电极上测定，线性关系良好（r（2）= 0.998），范围为2 ~ 10 μ g/L。测得的铅含量低至0.1微克/升。此外，在DPASV中发现，随着银电极中铋量的增加，锌峰显著地向更负的值偏移。镉和铅也有同样的情况，但程度较轻。最后，使用含15%铋的银电极在污染的河流中连续分析6周。
Electrochemical properties of silver electrodes with 2, 4, 6, 10 and 15% bismuth have systematically been investigated with cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). Increased overpotential towards hydrogen evolution reaction (HER) was found as a result of increasing amount of added bismuth. Ibis was also demonstrated in acid solution where zinc was successfully detected on mixed electrodes, but failed on pure silver electrodes. Formation and decomposition of oxide products formed on the different electrode surfaces were studied by cyclic voltammetry, and in addition to known species found on sliver, also peaks attributed to bismuth were achieved and examined. Zinc, cadmium, and lead were measured in the low mu g/L range on the mixed electrodes, and good linearity (r(2) = 0.998) was found for 2 to 10 mu g/L. Lead was measured down to 0.1 mu g/L. Further it was found in DPASV that the zinc peak significantly shifted towards a more negative value with increasing amount of bismuth in the silver electrodes. The same was also observed for cadmium and lead, but in a less extent. Finally a silver electrode containing 15% bismuth was used for continuous analyses in a polluted river for 6 weeks.