Naslov
Nickel and Ni-Co Alloy as Efficient Hydrogen Evolution Reaction Catalysts in Alkaline Media

Autori
Grubač, Zoran ; Krešić, Irena

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts 4th International Congress of Chemists and Chemical Engineers of Bosnia and Herzegovina / Korać, Fehim - , 2022, 133-133

Skup
4th International Congress of Chemists and Chemical Engineers of Bosnia and Herzegovina (ICCCEB&H 2022)

Mjesto i datum
Sarajevo, Bosna i Hercegovina, 30.06.2022. - 02.07.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Nickel catalysts, Hydrogen evolution, Ni-Co catalysts, Ni foam

Sažetak
Electrodes produced from polycrystalline nickel, 3D Ni foam and Ni-Co alloy were used as catalyst for the hydrogen evolution reaction (HER) at 20 °C in 0.5 mol L–1 NaOH solution. The purpose of the investigation was to evaluate their intrinsic catalytic activity. Cyclic voltammetry method was used to provide insight into the overall electrochemical behavior of the investigated materials. Potential range in which metal oxides / hydroxides formation and reduction take place was identified. Tafel plots, pseudo-steady state linear polarization and electrochemical impedance spectroscopy (EIS) measurements were performed in the potential range of HER. In this range the modified Randles electric equivalent circuit was successfully used for modeling obtained EIS data. For all investigated electrode materials the exchange current densities and cathodic Tafel slopes were derived. The results of pseudo-steady state linear polarization are in accordance with the results obtained by electrochemical impedance method. Among the investigated catalysts, 3D Ni foam shows the highest catalytic activity. It was found that for the HER at investigated electrodes the main pathway is Volmer-Heyrovski.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA