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堿性環(huán)境電沉積
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| 請問有人在堿性環(huán)境下進(jìn)行電沉積實驗?我采用的電解液在酸性環(huán)境中可以沉積,但是我現(xiàn)在想改變下被沉積物質(zhì),只能在堿性環(huán)境下進(jìn)行沉積,但是沉積不上,請教下這是個什么問題?是不是在堿性或酸性環(huán)境中都可以實現(xiàn)電化學(xué)沉積? |
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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. 這是實驗部分的原文,請高手指點下,謝謝! |
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