Electrochemical characterisation of multifunctional electrocatalytic mesoporous Ni-Pt thin films in alkaline and acidic media

Eiler, Konrad; Krawiec, H.; Kozina, I. Yu.; Sort, Jordi; Pellicer, Eva

doi:10.1016/j.electacta.2020.136952

Cited by 17 publications

(14 citation statements)

References 37 publications

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“…Before these two oxidation peaks, a small one appearing at approximately −0.25 V vs Ag|AgCl|Cl − can be attributed to the oxidation of the more hydrogenated deposited Ni. [47][48][49][50]52,53 Similar behavior was observed in the cathodic scan over the polycarbonate membrane coated with an Au layer (Figure 1b), although lower current densities were detected as well. The voltammetric profile also revealed that the current of platinum reduction was followed by the alloy's deposition.…”

Section: ■ Experimental Sectionsupporting

confidence: 72%

Electrodeposited Ni-Rich Ni–Pt Mesoporous Nanowires for Selective and Efficient Formic Acid-Assisted Hydrogenation of Levulinic Acid to γ-Valerolactone

et al. 2021

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In pursuit of friendlier conditions for the preparation of high-value biochemicals, we developed catalytic synthesis of γ-valerolactone by levulinic acid hydrogenation with formic acid as the hydrogen source. Both levulinic and formic acid are intermediate products in the biomass transformation processes. The objective of the work is twofold: the development of a novel approach for milder synthesis conditions to produce γ-valerolactone and the reduction of the economic cost of the catalyst. Ni-rich Ni–Pt mesoporous nanowires were synthesized in an aqueous medium using a combined hard–soft-template-assisted electrodeposition method, in which porous polycarbonate membranes controlled the shape and the Pluronic P-123 copolymer served as the porogen agent. The electrodeposition conditions selected favored nickel deposition and generated nanowires with nickel percentages above 75 atom %. The increase in deposition potential favored nickel deposition. However, it was detrimental for the porous diameter because the mesoporous structure is promoted by the presence of the platinum-rich micelles near the substrate, which is not favored at more negative potentials. The prepared catalysts promoted the complete transformation to γ-valerolactone in a yield of around 99% and proceeded with the absence of byproducts. The coupling temperature and reaction time were optimized considering the energy cost. The threshold operational temperature was established at 140 °C, at which, 120 min was sufficient for attaining the complete transformation. Working temperatures below 140 °C rendered the reaction completion difficult. The Ni 78 Pt 22 nanowires exhibited excellent reusability, with minimal nickel leaching into the reaction mixture, whereas those with higher nickel contents showed corrosion.

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Section: ■ Experimental Sectionsupporting

confidence: 72%

Electrodeposited Ni-Rich Ni–Pt Mesoporous Nanowires for Selective and Efficient Formic Acid-Assisted Hydrogenation of Levulinic Acid to γ-Valerolactone

et al. 2021

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“…The existence of a pair of coupled peaks at ca. +0.46 V is generally attributed to the reversible transformation of Ni (II)/Ni (III) species via the redox reaction between Ni(OH) 2 and NiOOH, according to the following Equation (1) [60]: The presence of Pt on the surface of the Ni/Nifoam electrode was confirmed by the cathodic peak located at ca. −0.4 V in the alkaline 1 M NaOH solution.…”

Section: Characterization Of the Electrodesmentioning

confidence: 99%

Section: Characterization Of the Electrodesmentioning

confidence: 99%

An Enhanced Oxidation of Formate on PtNi/Ni Foam Catalyst in an Alkaline Medium

et al. 2022

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In this study, a platinum-coated Ni foam catalyst (denoted PtNi/Ni foam) was investigated for the oxidation of the formate reaction (FOR) in an alkaline medium. The catalyst was fabricated via a two-step procedure, which involved an electroless deposition of the Ni layer using sodium hypophosphite as a reducing agent and the subsequent electrodeposition of the platinum layer. The PtNi/Ni foam catalyst demonstrated enhanced electrocatalytic activity for the FOR in an alkaline medium compared to the Ni/Ni foam catalyst and pure Pt electrode. Moreover, the PtNi/Ni foam catalyst promoted the FOR at more negative potentials than the Pt electrode. This contributed to a significant negative shift in the onset potential, indicating the high activity of the catalyst. Notably, in alkaline media with the PtNi/Ni foam catalyst, the FOR proceeds via a direct pathway mechanism without significant accumulation of poisonous carbonaceous species on the PtNi/Ni foam catalyst.

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“…Electrodes with high catalytic activity and low cost are needed to make hydrogen gas production by the electrolysis of water more appealing with lower costs. To meet the need, specific electrodes are recommended such as transition metal modified foam, felt, and nano‐sheet electrodes 24‐38 . These have a great advantage with a larger surface area and specified active centers on substrates/precursors.…”

Section: Introductionmentioning

confidence: 99%

“…These have a great advantage with a larger surface area and specified active centers on substrates/precursors. In fact, Pt‐based electrodes and Pd, Ru, Rh, and Ir derivatives exhibit a larger efficiency and durability in laboratory‐scale researches 1,24,31,34 . However, due to the high cost and limited availability of resources, they have been unable to commercialize on a large scale.…”

Section: Introductionmentioning

confidence: 99%

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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Electrochemical characterisation of multifunctional electrocatalytic mesoporous Ni-Pt thin films in alkaline and acidic media

Cited by 17 publications

References 37 publications

Electrodeposited Ni-Rich Ni–Pt Mesoporous Nanowires for Selective and Efficient Formic Acid-Assisted Hydrogenation of Levulinic Acid to γ-Valerolactone

Electrodeposited Ni-Rich Ni–Pt Mesoporous Nanowires for Selective and Efficient Formic Acid-Assisted Hydrogenation of Levulinic Acid to γ-Valerolactone

An Enhanced Oxidation of Formate on PtNi/Ni Foam Catalyst in an Alkaline Medium

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

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