The photoelectrocatalytic activity, long term stability and corrosion performance of NiMo deposited titanium oxide nano-tubes for hydrogen production in alkaline medium

Mert, Mehmet; Mert, Başak Doğru; Kardaş, Gülfeza; Yazıcı, Birgül

doi:10.1016/j.apsusc.2017.06.216

Cited by 14 publications

(12 citation statements)

References 45 publications

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“…During forward scan, the appearance of the anodic peak at −0.6 V indicates Ni/Ni 2+ oxidation, followed by the change of Ni(OH) 2 to Ni(OH) 2 until 0.4 V (vs Ag/AgCl). Ni 2+ /Ni 3+ oxidation is detected at 0.45 V, whereas the Ni 3+ /Ni 2+ is seen at roughly 0.35 V as cathodic peak in backward scan 45‐48 . The anodic current increase at −0.25 V is corresponding to the transformation of Co/Co 2+ oxidation 1,49‐51 .…”

Section: Resultsmentioning

confidence: 92%

Production of NF / NiCo /Ag catalyst for hydrogen generation in alkaline medium

Mert

2021

Intl J of Energy Research

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Summary The nickel foam (NF) precursors were doped with nickel, cobalt particles with various chemical compositions; the most convenient one was decorated with silver nano‐domes and investigated for hydrogen production efficiency (HPE) in 1 M KOH. The X‐ray diffraction, field emission scanning electron microscopy, and energy‐dispersive X‐ray techniques were used to characterize the catalysts. Linear sweep voltammetry, cyclic voltammetry, Tafel polarization measurements, electrochemical impedance spectroscopy, and chronoamperometry were used to determine the electrochemical efficiency. The rough structured Ni‐ and Co‐deposited NF significantly increased the HPE achieved with silver nano‐domes particles decoration (NF/NiCo‐2/Ag). The results showed that NF/NiCo‐2/Ag was the most efficient catalyst, as it has lower hydrogen overpotential and a higher HPE, which was detected in polarization curves, as well as being stable during the 1 × 104 s electrolysis period and having a good response during electrochemical analysis. The produced hydrogen gas volume was 108.1 mL by using NF/NiCo‐2/Ag, at the end of 30‐minute electrolysis in 1 M KOH.

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Section: Resultsmentioning

confidence: 92%

Production of NF / NiCo /Ag catalyst for hydrogen generation in alkaline medium

Mert

2021

Intl J of Energy Research

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“…For the G/Ni and G/Ni/Ag electrodes, Ni/Ni 2+ oxidation peaks were detected at −0.7 V. Furthermore, the transformation of α‐Ni(OH) 2 to β‐Ni(OH) 2 was seen between the potential ranges of −0.6 to 0.4 V (vs Ag/AgCl). The anodic peak centered at 0.45 V was Ni 2+ /Ni 3+ transition and the cathodic peak at almost 0.5 V, corresponding to the Ni 3+ /Ni 2+ reduction 69‐72 . For the G/Ni/Ag electrode during the forward scan, the peak between 0.1 and 0.35 V is attributed to the oxidation of Ag (Ag/Ag 2 O and Ag 2 O/AgO) according to the equations shown below 73,74 …”

Section: Resultsmentioning

confidence: 99%

“…The cyclic voltammograms of G, G/Ni, and G/Ni/Ag were presented in Figure 3. The measurement presents information not only about the characterization of electrochemically deposited metallic coatings but also about HER activity of the electrodes when we compare the initial part of the cathodic potential region 69 …”

Section: Resultsmentioning

confidence: 99%

“…The measurement presents information not only about the characterization of electrochemically deposited metallic coatings but also about HER activity of the electrodes when we compare the initial part of the cathodic potential region. 69 As seen in Figure 3, anodic and cathodic peaks were not detected for G until 0.6 V during the forward and backward scan. For the G/Ni and G/Ni/Ag electrodes, Ni/Ni 2+ oxidation peaks were detected at −0.7 V. Furthermore, the transformation of α-Ni(OH) 2 to β-Ni(OH) 2 was seen between the potential ranges of −0.6 to 0.4 V (vs Ag/AgCl).…”

Section: Experimental Analysismentioning

confidence: 87%

“…The anodic peak centered at 0.45 V was Ni 2+ /Ni 3+ transition and the cathodic peak at almost 0.5 V, corresponding to the Ni 3+ /Ni 2+ reduction. [69][70][71][72] For the G/Ni/Ag electrode during the forward scan, the peak between 0.1 and 0.35 V is attributed to the oxidation of Ag (Ag/Ag 2 O and Ag 2 O/AgO) according to the equations shown below. 73,74 2Ag + 2OH − !…”

Section: Experimental Analysismentioning

confidence: 99%

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Experimental and theoretical study on hydrogen production by using Ag nanoparticle‐decorated graphite/Ni cathode

et al. 2020

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Summary 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.

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