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碱性环境电沉积
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| 请问有人在碱性环境下进行电沉积实验?我采用的电解液在酸性环境中可以沉积,但是我现在想改变下被沉积物质,只能在碱性环境下进行沉积,但是沉积不上,请教下这是个什么问题?是不是在碱性或酸性环境中都可以实现电化学沉积? |
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3楼2011-10-12 07:23:40
2楼2011-10-11 20:19:18
4楼2011-10-12 09:17:48
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Merck analytical reagent grade 3CdSO4 。8H2O, and Aldrich analytical reagent grade Na2S were used with-out further purification. Merck analytical reagent grade HClO4 and NH3 were used to prepare the pH 9.2 ammonia buffer used as supporting electrolyte. As a matter of fact, the whole sulphur (oxidative) underpotential deposition takes place at potentials negativeto-0.7 V on Ag(111) and at still more negative potentials on Cd layers,whereas cadmium (reductive) underpotential deposition on S-coated Ag(111) takes place at potentials positive to -0.8. Hence, both the sulphur and cadmium under- potential depositions were carried out in ammonia buffer solutions at -0.75 V (SCE). CdS growth was obtained by depositing sulphur from a Na2S solution,washing the cell with the supporting electrolyte, inject- ing the cadmium solution, waiting 30 s to deposit Cd, washing the cell, and repeating this cycle as many times as desired. Polarisation at constant potential was main-tained during the entire procedure. 这是实验部分的原文,请高手指点下,谢谢! |
5楼2011-10-12 11:55:15











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