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ann198412169

金虫 (小有名气)


[交流] 碱性环境电沉积

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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ann198412169

金虫 (小有名气)


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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zzhg1984

铜虫 (小有名气)



小木虫(金币+0.5):给个红包,谢谢回帖
ann198412169(金币+1): 2011-10-12 07:22:16
有些东西在酸性环境下可以沉积,但在碱性环境下就不行的;这就好比有些东西在水溶液中沉积不了,但在有机溶剂中确可以。
2楼2011-10-11 20:19:18
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ann198412169

金虫 (小有名气)


引用回帖:
2楼: Originally posted by zzhg1984 at 2011-10-11 20:19:18:
有些东西在酸性环境下可以沉积,但在碱性环境下就不行的;这就好比有些东西在水溶液中沉积不了,但在有机溶剂中确可以。

但文献中都是这么做的,一样的药品一样的碱性环境,为什么他们可以沉积上,而我的就不行,不知道问题在那儿?
3楼2011-10-12 07:23:40
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feixue6315

至尊木虫 (著名写手)



小木虫(金币+0.5):给个红包,谢谢回帖
ann198412169(金币+1): 2011-10-12 11:55:37
具体说说你沉积的是什么东西,大家也好给分析分析了
4楼2011-10-12 09:17:48
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