Showing papers by "Samo B. Hočevar published in 2015"
TL;DR: In this article, the dissolution behaviors of Ru and ruthenium oxide nanoparticles in acidic media were studied for the first time using highly sensitive in situ measurements of concentration by inductively coupled plasma mass spectrometry (ICP-MS).
Abstract: The dissolution behaviors of Ru and ruthenium oxide nanoparticles in acidic media were studied for the first time using highly sensitive in situ measurements of concentration by inductively coupled plasma mass spectrometry (ICP-MS). Online time- and potential-resolved electrochemical dissolution profiles revealed novel corrosion features (signals) in the potential window from 0 to ∼1.4 V, where known severe dissolution due to the oxygen evolution reaction (OER) takes place. Most of the features follow the thermodynamic changes of the Ru oxidation/reduction state, which consequently trigger so-called transient dissolution. An as-synthesized Ru sample was found to exhibit an order-of-magnitude higher dissolution rate than an electrochemically oxidized amorphous Ru sample. The latter, in turn, dissolved about 10 times faster than rutile RuO2. The observed OER activity was in an inverse relationship with the measured dissolution. Disagreement was found with the general assumption that the onset of the OER sho...
138 citations
TL;DR: In this article, a simple silver particle modified carbon paste electrode was proposed for the determination of low concentration levels of nitrite ions, which showed a linear square-wave voltammetric response in a wide examined concentration range of 0.05 to 1.0mmol L − 1, limit of detection (LOD) of 3μmol L − ǫ 1 and excellent repeatability with RSD 0.3%.
60 citations
TL;DR: In this article, a novel in-situ prepared copper film electrode (CuFE) for anodic stripping voltammetric measurement of trace levels of Hg (II) and Pb(II) is presented.
53 citations
TL;DR: In this paper, a screen printed carbon electrode (mpBiF-SPCE) was used for simultaneous measurement of Ni and Co(II) at their trace concentration level by means of adsorptive cathodic stripping voltammetry with dimethylglyoxime as a complexing agent.
Abstract: Macroporous bismuth film screen-printed carbon electrode (mpBiF-SPCE) was used for simultaneous measurement of Ni(II) and Co(II) at their trace concentration level by means of adsorptive cathodic stripping voltammetry with dimethylglyoxime as a complexing agent. The mpBiF-SPCE was prepared on a screen printed carbon electrode by colloidal crystal templating using aqueous suspension of polystyrene microspheres which were self-assembled onto the electrode by slow evaporation of solvent. Following the electrochemical deposition of bismuth film, the microspheres were dissolved with toluene providing the macroporous bismuth film structure. The mpBiF-SPCE offered good electroanalytical performance with estimated limits of detection of 27 and 94 ng L−1 for Ni(II) and Co(II), respectively, in combination with an accumulation time of 180 s, and relative standard deviations of 3.3 % for Ni(II) and 5.2 % for Co(II). The effect of potentially interfering ions and the surface-active compounds was also investigated. Both Ni(II) and Co(II) were assayed in the sample of sewer water with satisfactory recovery.
23 citations
TL;DR: In this article, a new approach for application of bismuth film electrode (BiFE) under more acidic conditions is presented, where the BiFE was prepared in-situ on a glassy carbon substrate electrode and employed for anodic stripping voltammetric measurement of Zn(II) in 0.01μmol L − 1 hydrochloric acid (pH 2.0) in the presence of dissolved oxygen.
18 citations