Browsing by Subject "electrodeposition"

Now showing 1 - 6 of 6

Access status: Open Access ,
AL$_{2}$O$_{3}$-Me layers obtained by the electrochemical method
(2013) Dobosz, Iwona; Uhlemann, Margitta; Gumowska, Wanda
Fine membranes with controlled size of pores were produced by the two step anodizing process of the aluminium in oxalic acid solution. Highly ordered Co, Fe and CoFe nanowire arrays were prepared by two electrodeposition techniques: pulsed (PED) and potentiostatic electrodeposition (DC) into the anodic alumina membrane (AAM) templates. It has been observed that both experimental methods (PED, DC) enable the embedding of Co, Fe as well as CoFe alloy into the pores of the AAM with a high aspect ratio.
Access status: Open Access ,
Comparative studies of the electroreduction of zinc ions from gluconate solutions
(Wydawnictwa AGH, 2019) Rudnik, Ewa; Chat-Wilk, Karolina
This study considers the role of chloride and sulphate anions in the cathodic reduction of zinc ions from gluconate solutions (chloride, sulphate, chloride-sulphate). Cyclic potentiodynamic and potentiostatic polarization measurements, as well as chronoamperometric experiments, were performed. Electrochemical results were correlated with the speciation of the baths. The experiments revealed the inhibiting effect of sulphate ions on the cathodic process caused by the formation of stable neutral ZnSO4 complex in the sulphate-gluconate bath. It resulted in zinc deposition under a limiting current, with the release of metal cation as a rate-determining step. The less stable ZnGlu+ complex dominated both chloride-containing baths, thus the metal deposition ran under activation control. Independent of the solution composition, the nucleation of zinc occurred according to the instantaneous model.
Access status: Restricted ,
Design of new $Cu-Fe$ metallic oxide foams formed by electrodeposition for asymmetric supercapacitors electrodes
(Data obrony: 2014-03-28) Lange, Grzegorz
Wydział Energetyki i Paliw
Access status: Open Access ,
Electrochemical codeposition of molybdenum and selenium
(2015) Kowalik, Remigiusz; Kutyła, Dawid; Mech, Krzysztof; Wróbel, Mirosław; Tokarski, Tadeusz; Żabiński, Piotr
The electrodeposition of Mo-Se thin films from a sulfate solution containing Na2MoO4 and H2SeO3 was studied. The process of deposition was conducted under potentiostatic conditions on a copper electrode. The effect of potential value, pH, and time of deposition were examined. The deposits were characterized by X-ray diffraction, X-ray fluorescence, and scanning electron microscopy. The obtained results have shown the possibility of co-deposition of molybdenum and selenium with different stoichiometric ratios.
Access status: Open Access ,
Electrodeposited copper-cuprite layers modified with rGO for light-supported conversion of $CO_{2}$ to methane and ethylene
(2025) Mech, Krzysztof; Kolbusz, Patrycja; Sławek, Andrzej; Marzec, Mateusz M.; Csapó, Edit
Akademickie Centrum Materiałów i Nanotechnologii
$Cu-Cu_{2}O-rGO$ composite layers were electrodeposited for the first time from alkaline copper(II) lactate-based electrolytes containing dispersed rGO flakes. The properties of electrodeposited composite materials are strongly affected by applied potentials. Obtained layers were investigated towards their catalytic activity in electro- and photoelectrochemical artificial $CO_{2}$-based synthesis of hydrocarbons. The effect of applied potential on the morphology, crystallographic structure, band gap, and conduction and valence band location was investigated. The catalytic performance of the electrodeposited layers was analyzed in $CO_{2}$-saturated $KHCO_{3}$ electrolyte under the dark and at light illumination applying different conversion potentials. The stability of the obtained layers was analysed based on XPS and XAS results. Maximal Faradaic efficiencies for methane and ethylene formation were achieved in the presence of light and amounted to 10 and 9.91%, respectively. Reported results indicate that the presence of rGO in deposited layers significantly affects the band structure of electrodeposited layers. It was also observed that even slight modification of electrodeposition or conversion potential results in noticeable differences in Faradaic efficiency corresponding to hydrocarbons formation.
Access status: Open Access ,
Electrodeposition of Cu-Cu2O composite films of adjustable band structure for photoelectrochemical conversion of carbon dioxide to hydrocarbons
(2024) Mech, Krzysztof; Podborska, Agnieszka; Marzec, Mateusz M.; Szaciłowski, Konrad; Ponce de Leon, Carlos
Akademickie Centrum Materiałów i Nanotechnologii
The electrodeposited $Cu-Cu_{2}O$ composite films were investigated in terms of their selectivity, efficiency, and stability in the electrochemical and photoelectrochemical conversion of $CO_{2}$ to hydrocarbons. Composite films were deposited at various potentials from an alkaline copper(II) lactate solution. The influence of electrode potential on the structure, morphology, and location of the valence and conduction bands was investigated. Finally, the catalytic activity of the materials was investigated in the dark and under illumination at various potentials in a $CO_{2}$-saturated $KHCO_{3}$ solution. Gas chromatography analysis indicated that maximum concentrations of $CH_{4}$ and $C_{2}H_{4}$ were observed under illumination and amounted to 13.37 and 8.99%, respectively. The highest Faradaic efficiencies for ethylene formation were observed at - 0.893 V vs. RHE, while for methane at - 0.893 V or 0.993 V, depending on the applied deposition potential. Performed studies indicated that at even relatively low conversion potentials, $Cu_{2}O$ may not be fully reduced to metallic copper and therefore affects the mechanism and kinetics of electrode reactions. Moreover, reported results indicated possibilities for controlling the selectivity toward the formation of hydrocarbons through proper selection of the composite synthesis conditions and conversion parameters as well.