Naslov
Nanostructured Nickel Films: Electrocrystallization on Carbon Microelectrodes and Electrocatalytic Properties for the HER

Autori
Petrović, Željka ; Grubač, Zoran ; Metikoš-Huković, Mirjana

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
BSUN-COSENT Conference for Junior Research Scientists, Constantza, Romania, 2004 / - , 2004, 1-1

Skup
BSUN-COSENT Conference for Junior Research Scientists

Mjesto i datum
Constanţa, Rumunjska, 03.09.2004. - 04.09.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
nickel nanoparticles ; carbon fibre microelectrode ; electrocrystallisation (nucleation) ; electrocatalysis ; hydrogen evolution reaction

Sažetak
The very initial nucleation stage of the electrocrystallization of nanostructured nickel particles has been studied on an assembly of carbon fibres, consisting of 36, 000 microdiscs randomly distributed inside the matrix of a non-conducting polymer. Microdiscs were so far apart that the crystals could not interact in any way. It was shown that electrodes with very small electroactive areas simplify the study of the nucleation and growth mechanism. Within an appropriate potential range the initial deposition kinetic corresponds to a three-dimensional progressive nucleation mechanism and diffusion controlled stable cluster growth. Relevant kinetic parameters ; the nucleation rate and the number of atoms in the critical nucleus including the diffusion coefficient were determined from the electrochemical in situ measurements. The deposit morphology was examined by ex situ methods. The electrocatalytic performance of Ni nanoparticles supported on carbon microelectrodes with respect to the hydrogen evolution reaction (HER) has been evaluated on the basis of dc-electrochemical and ac-impedance spectroscopy measurements in a 1M NaOH solution. Obtained results indicate the excellent electrocatalytic activity of the nanostructured Ni deposit towards H_2 evolution in comparison to the bulk polycrystalline Ni.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

POVEZANOST RADA