Experimental and theoretical study on hydrogen production by using Ag nanoparticle‐decorated graphite/Ni cathode
Küçük Resim Yok
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In this study, graphite (G) electrode was coated with nickel and decorated with
silver nanoparticles (G/Ni/Ag) with the help of galvanostatic method, and electrodes were used as a cathode in alkaline water electrolysis system. The characterization was achieved using X-ray diffraction and field emission scanning
electron microscopy. Hydrogen evolution performance of electrodes was investigated via cyclic voltammetry, chronoamperometry, cathodic polarization curves, and electrochemical impedance measurements. Electrochemical results
showed that hydrogen production efficiency significantly increased and charge
transfer resistance decreased via G/Ni/Ag. The electrochemical water splitting
performance of G/Ni/Ag, was established in a joint experimental and computational effort. Water and proton adsorption on Ag-decorated Ni surface were
investigated using density functional theory. Electronic structure calculations
identified the role of Ag adatom and Ni surface on water and proton adsorptions. From the computational studies, O in water was more reliable to adsorb
at the bridge position of the Ag and Ni atoms, leading improved orbital overlap
between H and Ni atoms and maximized chemical and physical interactions
between the H2O molecules. Therefore, the Ag-decorated Ni(111) surface provides preferable adsorption site for the O atom in water and direct interactions
between water Hs and available surface Ni atoms promote water dissociation.
Açıklama
Anahtar Kelimeler
alkaline electrolysis, G/Ni/Ag cathode, hydrogen production
Kaynak
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
WoS Q Değeri
Q3
