Kinetics of Active Oxide Species Derived from a Metallic Nickel Surface for Efficient Electrocatalytic Water Oxidation

Yuan, Yuling; Guo, Yanjun; Wu, Wei; Mao, Zhiping; Xu, Hong; Ma, Yimeng

doi:10.1021/acsenergylett.2c01493

Cited by 11 publications

(22 citation statements)

References 71 publications

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“…The effect of the reaction conditions on the glucose electrooxidation was investigated over NiO/Ni foam obtained by thermal treatment, since NiO is a good and stable catalyst for electrooxidation reactions. 48 The calcination of the Ni foam at 500 °C for 1 h developed on the surface patches of a solid with ca. 150–300 nm thickness (Fig.…”

Section: Resultsmentioning

confidence: 99%

Electrification of glucose valorization over NiO/Ni foam

Sanghez de Luna,

Tabanelli,

Velasco-Vélez

et al. 2023

Sustainable Energy Fuels

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Section: Resultsmentioning

confidence: 99%

Electrification of glucose valorization over NiO/Ni foam

Sanghez de Luna,

Tabanelli,

Velasco-Vélez

et al. 2023

Sustainable Energy Fuels

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“…OER for the anodized foam occurs at 1.70 V (470 mV overpotential). Indeed, for many catalysts, the OER overpotential under neutral or acidic conditions is higher than the OER overpotential under alkaline conditions. – …”

Section: Resultsmentioning

confidence: 99%

Unveiling the Oxygen Evolution Mechanism with FeNi (Hydr)oxide under Neutral Conditions

Akbari,

Nandy,

Chae

et al. 2023

Inorg. Chem.

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Large-scale solar-driven water splitting is a way to store energy, but it requires the development of practical and durable oxygen evolution reaction (OER) catalysts. The present paper aims to investigate the mechanism of the OER, local pH, high-valent metal ions, limitations, conversions, and details during the OER in the presence of FeNi foam using in situ surface-enhanced Raman spectroscopy. This research also explores the use of in situ surface-enhanced Raman spectroscopy for detecting species on foam surfaces during the OER. The acidic media around the electrode not only limit the process but also affect the phosphate ion protonation and overall catalysis effectiveness. The study proposes that FeNi hydroxides serve as true catalysts for OER under neutral conditions, rather than FeNi phosphates. However, phosphate species remain crucial for proton transfer and water molecule adsorption. Changes observed in pH at the open-circuit potential suggest new insights concerning the coordination of Ni(II) to phosphate ions under certain conditions. By extrapolating the Tafel plot, the overpotential for the onset of OER was determined to be 470 mV. Furthermore, the overpotentials for current densities of 1 and 5 mA/cm2 were 590 and 790 mV, respectively. These findings offer valuable insights into the advancement of the OER catalysts and our understanding of the underlying mechanism for efficient water splitting; both are crucial elements for the purpose of energy storage.

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“…The quantification of O 2 and H 2 evolution during PEC MB and MB* oxidation using TiO 2 and α ‐Fe 2 O 3 photoanodes, and the calculation of corresponding faradaic efficiency were reported previously. [ 4b,33 ] In brief, the PEC oxidation in the three‐electrode configuration was carried out using a gas‐tight gas product circulation and collection system (Labsolar 6A, Beijing Perfectlight). The gas product was generated in the system and sent automatically to a gas chromatography (GC, GC9790 II, FuLi Instruments).…”

Section: Methodsmentioning

confidence: 99%

Photoinduced Absorption Spectroscopy of Photoelectrocatalytic Methylene Blue Oxidation on Titania and Hematite: The Thermodynamic and Kinetic Impacts on Reaction Pathways

Guo

Yuan

et al. 2023

Advanced Science

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Photoelectrochemical oxidation of methylene blue is investigated, with particular focus on the difference in kinetics and thermodynamics of decoloration and mineralization employing photoinduced absorption spectroscopy. Hematite and titania photoanodes are used for the comparison of both reactions, which is determined to be associated with the depth of the valence band (3.2 vs 2.5 V for titania and hematite, respectively). Methylene blue is mineralized by the titania photoanode, however it is only oxidized to small fragments by hematite. Such difference is related to the valence band potential that provides the thermodynamic driving force for photogenerated holes in both materials. In addition, the kinetic competition of water oxidation is found to occur on titania by controlling the pH of the electrolyte. In the pH 14 electrolyte, mineralization of methylene blue is suppressed due to the faster and dominant kinetics of water oxidation, in contrast to the complete mineralization in the near neutral electrolyte where water oxidation kinetics are modest. These results clearly address the importance considering both thermodynamic and kinetic challenges of methylene blue oxidation, which has been thought to be an easy molecule to oxidize, as the model reaction in the application of photo(electro)catalysis using metal oxides.

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Kinetics of Active Oxide Species Derived from a Metallic Nickel Surface for Efficient Electrocatalytic Water Oxidation

Cited by 11 publications

References 71 publications

Electrification of glucose valorization over NiO/Ni foam

Electrification of glucose valorization over NiO/Ni foam

Unveiling the Oxygen Evolution Mechanism with FeNi (Hydr)oxide under Neutral Conditions

Photoinduced Absorption Spectroscopy of Photoelectrocatalytic Methylene Blue Oxidation on Titania and Hematite: The Thermodynamic and Kinetic Impacts on Reaction Pathways

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