6 research outputs found
ΠΠ°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·Π°ΡΠΈΡΠ° Π½Π° ΠΎΠΊΡΠΈΠ΄Π½ΠΈΠΎΡ ΡΠ»ΠΎΡ ΡΠΎΠ·Π΄Π°Π΄Π΅Π½ Π²ΡΠ· Π±Π°ΠΊΠ°ΡΠΎΡ ΠΏΡΠΈ ΠΊΠΎΡΠΎΠ·ΠΈΡΠ° Π²ΠΎ ΡΠΈΠ½ΡΠ΅ΡΠΈΡΠΊΠ° ΠΌΠΎΡΡΠΊΠ° Π²ΠΎΠ΄Π°
ΠΡΡΠ΅Π½ΠΈ ΡΠ΅ Π΅Π»Π΅ΠΊΡΡΠΎΡ
Π΅ΠΌΠΈΡΠΊΠΈ ΠΈΡΠΏΠΈΡΡΠ²Π°ΡΠ° Π½Π° ΠΎΠΊΡΠΈΠ΄Π½ΠΈΡΠ΅ ΡΠΈΠ»ΠΌΠΎΠ²ΠΈ ΡΠΎΠ·Π΄Π°Π΄Π΅Π½ΠΈ ΡΠΎ Π°Π½ΠΎΠ΄Π½Π° ΠΏΠΎΠ»Π°ΡΠΈΠ·Π°ΡΠΈΡΠ° Π½Π° Π±Π°ΠΊΠ°ΡΠΎΡ Π²ΠΎ ΡΠΈΠ½ΡΠ΅ΡΠΈΡΠΊΠ° ΠΌΠΎΡΡΠΊΠ° Π²ΠΎΠ΄Π° ΠΏΡΠΈ ΠΏΠΎΡΠ΅Π½ΡΠΈΡΠ°Π» ΠΎΠ΄ -400 Π΄ΠΎ -200mV (3KE) ΠΈ ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠΈ ΠΎΠ΄ 5, 10, 15 ΠΈ 20 ΡΡΠ΅ΠΏΠ΅Π½ΠΈ Π¦Π΅Π»Π·ΠΈΡΡ Π²ΠΎ Π²ΡΠ΅ΠΌΠ΅ΡΡΠ°Π΅ΡΠ΅ ΠΎΠ΄ 3 - 10 ΠΌΠΈΠ½ΡΡΠΈ
Parametri elektrodne reakcija kod korozije bakra i mesinga u sintetickoj morskoj vodi
ΠΠ°ΠΊΠ°Ρ ΠΈ ΡΠ΅Π³ΠΎΠ²Π΅ Π»Π΅Π³ΡΡΠ΅ ΠΊΠ°ΠΊΠΎ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΡΠΊΠΈ ΠΌΠ°ΡΠ΅ΡΠΈΡΠ°Π»ΠΈ Π½Π°Π»Π°Π·Π΅ Π²ΡΠ»ΠΎ ΡΠΈΡΠΎΠΊΡ ΠΏΡΠΈΠΌΠ΅Π½Ρ Ρ ΠΌΠΎΡΡΠΊΠΈΠΌ ΡΡΠ»ΠΎΠ²ΠΈΠΌΠ°. ΠΠΈΡ
ΠΎΠ²Π° ΠΏΠΎΡΡΠΎΡΡΠ° ΠΏΡΠΎΡΠ΅ΡΡΡΠ΅ ΡΠ΅ Π½Π° ΠΎΠΊΠΎ ΡΡΠΎ Ρ
ΠΈΡΠ°Π΄Π° ΡΠΎΠ½Π° Π³ΠΎΠ΄ΠΈΡΡΠ΅ ΡΠ° ΡΠ΅Π½Π΄Π΅Π½ΡΠΈΡΠΎΠΌ Π΄Π°ΡΠ΅Π³ ΠΏΠΎΡΠ°ΡΡΠ°..
Sophisticated electrocatalysts for economical production of hydrogen, Part B: Elekctrochemical characterization
Electrochemical characterization of composite hypo-hyper d - electrocatalysts for hydrogen evolution reaction (HER) was performed using cyclic voltammetry and steady - state galvanostatic method. Cyclic voltammograms are without any pronounced peaks corresponding to some surface processes, typically for porous electrodes
Sophisticated electrocatalysts for economical production of hydrogen Part A: Structural characterrization
An original procedure was applied in order to prepare composite electrocatalysts for hydrogen evolution reaction HER, containing Ni, Co and CoNi as a hyper d β electronic phase and TiO2 as a hypo-phase deposited on conductive carbon substrate Vulcan XC-72. The catalystβs support (TiO2 and carbon) was thermally treated on 250 and 480Β°C in the atmosphere of H2 and N2. XRD and SEM methods were employed in order to elucidate the influence of temperature on the structural characteristics of catalysts
Modifications for the improvement of catalyst materials for hydrogen evolution
The structural and electrocatalytic characteristics of composite materials based on non-precious metals were studied. Precursors of metallic phase (Ni, Co or CoNi) and oxide phase (TiO2) were grafted on a carbon substrate (Vulcan XC-72) by the sol-gel procedure and thermally treated at 250 ΒΊC. Ni and CoNi crystals of 10β20 nm were produced, in contrast the Co and TiO2 were amorphous. The dissimilar electronic character of the components gives rise to a significant electrocatalytic activity for the hydrogen evolution reaction (HER), even in the basic series of prepared materials. Further improvement of the catalysts was achieved by modification of all three components. Hence, Mo was added into the metallic phase, TiO2 was converted into the crystalline form and multiwall carbon nanotubes (MWCNTs) were used instead of carbon particles. The improvement, expressed in terms of the lowering the hydrogen evolution overpotential at 60 mA cmβ2, was the most pronounced in the Ni-based systems grafted on MWCNTs (120 mV lower HER overpotential) compared to 60 mV in case of Ni-based systems grafted on crystalline TiO2 (TiO2 prepared at 450 ΒΊC) and of Ni-based systems containing 25 at.% Mo. Nevertheless, even with the realized enhancement, of all the fested materials, the Co-based systems remained superior HER catalysts
Carbon nanotubes as support for Co/TiO2 electrocatalysts for hydrogen evolution
The aim of this work was to apply multiwalled carbon nanotubes (MWCNTs) as a catalyst support in composite Co/TiO2/C electrocatalysts for hydrogen evolution. In order to elucidate the effect of MWCNTs, corresponding catalysts deposited on traditional carbon material Vulcan XC-72 were prepared as well