Controllable voltammetric formation of a structurally disordered NiOOH/Ni(OH)2 redox pair on Ni-nanowire electrodes for enhanced electrocatalytic formaldehyde oxidation

Trafela, Špela; Zavašnik, Janez; Šturm, Sašo; Rožman, Kristina Žužek

doi:10.1016/j.electacta.2020.137180

Cited by 32 publications

(23 citation statements)

References 71 publications

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“…The results demonstrate that the product distribution is closely related to the pH value of the electrolytes. Using the electrolyte with a pH value of 13, the electrode surfaces will retain a high concentration of hydroxide ions, which is conducive to the formation of active sites (NiOOH) during the GOR process. − …”

Section: Resultsmentioning

confidence: 99%

Electrolysis of Glycerol by Non-Noble Metal Hydroxides and Oxides

Zhang

Shen

2023

ACS Appl. Energy Mater.

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A series of free-standing electrodes consisting of hydroxides (Ni(OH) 2 , Co(OH), NiFeLDH, and CoFeLDH) and oxides (NiO, Co 3 O 4 , NiFe 2 O 4 , and CoFe 2 O 4 ) supported by carbon paper were fabricated via an in situ hydrothermal process and further examined for glycerol conversion. The morphology and structures of the samples were characterized by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The performance of the samples was studied by cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy. The products of glycerol oxidation were analyzed by high-performance liquid chromatography. Operando electrochemical Raman spectroscopy was employed to monitor the variations on the active sites and intermediates. Among the samples, the NiO exhibited superior activity with the largest current density of 0.8 mA cm −2 at 1.7 V and selectivity of 97% for formic acid. Furthermore, coupling the hydrogen evolution reaction with the glycerol electro-oxidation reaction (GOR), we explored the electrolysis of water and glycerol. The potential of the electrolysis process was negatively shifted from 1.68 to 1.28 V by replacing the oxygen evolution reaction with GOR. The strategy reported in this work could afford a sustainable approach to produce hydrogen and value-added chemicals with high energy efficiency.

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Section: Resultsmentioning

confidence: 99%

Electrolysis of Glycerol by Non-Noble Metal Hydroxides and Oxides

Zhang

Shen

2023

ACS Appl. Energy Mater.

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“…There is a small redox couple at 1.23/1.07 V RHE corresponding to a thickening of the NiO x layer and a weak conversion of α-Ni(OH) 2 to β-Ni(OH) 2 through ageing, though complete conversion is unlikely since the voltage range is insufficient [36,38,39]. Given the magnitude of the main reducing current, it is very likely that the oxide layer formed during the forward scan was almost completely removed [36].…”

Section: Hydrochloric Acidmentioning

confidence: 99%

Investigation of Wet-Preparation Methods of Nickel Foam For Alkaline Water Electrolysis

Ferriday

Sampathkumar

Middleton

et al. 2023

J. Phys.: Conf. Ser.

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Water electrolysers are multi-component systems whose performance relies on each part performing its task. A great emphasis has been placed on the development of efficient catalyst-coated electrodes, however the efficacy of the underlying substrate itself has been overlooked. This paper investigates the resulting performance of nickel foam electrodes in 1.0 M KOH after being treated in various concentrations of hydrochloric acid and sulphuric acid. The greatest performance was achieved utilising 0.50 M H2SO4 as measured by LSV, EIS and CV and ECSA, resulting in a 27% decline in series resistance relative to untreated nickel foam. The series resistance decreased continuously with acid concentration until a plateau was reached at the concentration of 0.5 M, where this trend was seen for both types of acid. Utilising these preparation methods for nickel foam electrodes can notably enhance electrode performance.

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“…The third redox couple displays the formation and reduction of β-NiOOH as exhibited in Eq. 5 [17,[19][20][21][22].…”

Section: Morphologicalmentioning

confidence: 99%

Determining the change in performance from replacing a separator with an anion exchange membrane for alkaline water electrolysis

Ferriday

Middleton

Kolhe

2023

J. Phys.: Conf. Ser.

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The emphasis on energy storage has caused renewed interest in alkaline water electrolysis (AWE), where the novel anion exchange membrane (AEM) has opened new pathways to further improve this mature technology. The comparison between the novel and the mature is most commonly performed on uneven grounds, as the ionic conductivity of the 30 wt.% (6.89 M) KOH electrolyte used in AWE is significantly greater than the 1.0 M employed in AEM water electrolysis. Through this paper, the performance of a zero-gap water electrolyser is systematically tested utilising either a separator or an AEM in a 1.0 M KOH electrolyte over several temperatures. Catalysed with only untreated nickel foam, the cell configuration with the AEM displayed predictably enough a notably lower series resistance and thereby a lower overpotential. However, the cell with the separator displayed better innate thermal stability, and showed stable results at 25°C, 40°C and 70°C. These findings exhibit the potential of additional R&D efforts in both separators and AEMs.

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Controllable voltammetric formation of a structurally disordered NiOOH/Ni(OH)2 redox pair on Ni-nanowire electrodes for enhanced electrocatalytic formaldehyde oxidation

Cited by 32 publications

References 71 publications

Electrolysis of Glycerol by Non-Noble Metal Hydroxides and Oxides

Electrolysis of Glycerol by Non-Noble Metal Hydroxides and Oxides

Investigation of Wet-Preparation Methods of Nickel Foam For Alkaline Water Electrolysis

Determining the change in performance from replacing a separator with an anion exchange membrane for alkaline water electrolysis

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