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Voltammetry of Copper Sulfide at the Mercury Electrode (CROSBI ID 517516)

Prilog sa skupa u zborniku | izvorni znanstveni rad

Krznarić, Damir ; Helz, George, R. ; Ciglenečki, Irena Voltammetry of Copper Sulfide at the Mercury Electrode // Book of Abstracts. 4^th Croatian Symposium on Electrochemistry / Gojo, Miroslav ; Mandić, Zoran (ur.). Zagreb: Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2006

Podaci o odgovornosti

Krznarić, Damir ; Helz, George, R. ; Ciglenečki, Irena

engleski

Voltammetry of Copper Sulfide at the Mercury Electrode

Certain natural waters appear to contain copper sulfide (CuxS) nanoparticles in nanomolar concentrations (as Cu). These nanoparticles have been tentatively identified by the characteristic pH below which they deposit sulfide onto Hg electrodes. A proposed alternate approach to studying CuxS nanoparticles relies on their hydrophobicity, which causes them to sorb to Hg electrodes ; there they can undergo reduction at -0.9 to -1.1 V vs. Ag/AgCl. However solutions supersaturated with respect to Cu sulfide phases also form CuxS directly at Hg electrode surfaces. The voltammetric reduction peaks obtained from these deposits are not clearly distinguishable from those obtained from sorbed nanoparticles. Surface formation of CuxS, which appears to be limited to approximately two layers, involves a reaction between Cu amalgam and electrodeposited HgS. Surface-formed CuxS could be problematic in studies of CuxS nanoparticles, but this obstacle can be avoided by conducting voltammetric accumulations at potentials too negative for HgS electrodeposition (e.g. -0.75 V).

copper sulfide; nanoparticles; cyclic voltammetry; mercury electrode

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Podaci o prilogu

2006.

objavljeno

Podaci o matičnoj publikaciji

Book of Abstracts. 4^th Croatian Symposium on Electrochemistry

Gojo, Miroslav ; Mandić, Zoran

Zagreb: Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI)

Podaci o skupu

4^th Croatian Symposium on Electrochemistry

predavanje

28.05.2006-01.06.2006

Primošten, Hrvatska

Povezanost rada

Geologija, Kemija