Superior catalytic activity of α-Ni(OH)<sub>2</sub> for urea electrolysis

Wu, Tzu−Ho; Hou, Bo−Wei

doi:10.1039/d1cy00435b

Cited by 26 publications

(25 citation statements)

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“…A typical work reported by Wang's group proposed that NOR is a two-step, oneelectron reaction including an electrogenerated catalyst dehydrogenation reaction from lattice hydroxyl to electron-deficient lattice oxygen and a spontaneous nucleophile dehydrogenation reaction on model Ni(OH) 2 catalysts 20 . Compared to Ni(OH) 2 , some recent studies have shown that nickel non-hydroxides exhibit better performance [23][24][25] . Nevertheless, the surface species transformation of metallic catalysts often occurs during electrooxidation, leading to much controversy regarding the activity origin 20 .…”

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confidence: 99%

Insights into the activity of nickel boride/nickel heterostructures for efficient methanol electrooxidation

et al. 2022

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Designing efficient catalysts and understanding the underlying mechanisms for anodic nucleophile electrooxidation are central to the advancement of electrochemically-driven technologies. Here, a heterostructure of nickel boride/nickel catalyst is developed to enable methanol electrooxidation into formate with a Faradaic efficiency of nearly 100%. Operando electrochemical impedance spectroscopy and in situ Raman spectroscopy are applied to understand the influence of methanol concentration in the methanol oxidation reaction. High concentrations of methanol inhibit the phase transition of the electrocatalyst to high-valent electro-oxidation products, and electrophilic oxygen species (O* or OH*) formed on the electrocatalyst are considered to be the catalytically active species. Additional mechanistic investigation with density functional theory calculations reveals that the potential-determining step, the formation of *CH2O, occurs most favorably on the nickel boride/nickel heterostructure rather than on nickel boride and nickel. These results are highly instructive for the study of other nucleophile-based approaches to electrooxidation reactions and organic electrosynthesis.

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Insights into the activity of nickel boride/nickel heterostructures for efficient methanol electrooxidation

et al. 2022

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“…Also, the presence of the two satellite peaks at binding energies of 861 and 880 eV conrms the formation of Ni(OH) 2 . [51][52][53][54][55] Additionally, from the deconvoluted O 1s spectra of both Ni(OH) 2 /RGR and Ni(OH) 2 / FEGR electrodes, Fig. 5B and E…”

Section: Resultsmentioning

confidence: 99%

Promoted glucose electrooxidation at Ni(OH)₂/graphene layers exfoliated facilely from carbon waste material

et al. 2023

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“…Among them, NiCo LDH-NO 3 exhibits the lowest onset potential, highest current responses and highest faradaic efficiency ( Figure 7 b), indicating that expanding the interlayer distance of NiCo layer double hydroxide (LDH) can effectively boost intrinsic UOR catalytic activity. In addition to regulating the interlayer distance of β phase LDH, Wu et al [ 47 ] further revealed the crystallographic effects of Ni(OH) 2 on catalytic activity toward urea oxidation. Compared to one electron transfer in β−NiOOH/β−Ni(OH) 2 , γ−NiOOH/α−Ni(OH) 2 redox transition exhibits better electrochemical activity due to more than one electron transfer (~1.5−1.7).…”

Section: Ni-based Electrocatalysts For Uor Applicationmentioning

confidence: 99%

Recent Development of Nickel-Based Electrocatalysts for Urea Electrolysis in Alkaline Solution

Anuratha

Rinawati

et al. 2022

Nanomaterials

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Recently, urea electrolysis has been regarded as an up-and-coming pathway for the sustainability of hydrogen fuel production according to its far lower theoretical and thermodynamic electrolytic cell potential (0.37 V) compared to water electrolysis (1.23 V) and rectification of urea-rich wastewater pollution. The new era of the “hydrogen energy economy” involving urea electrolysis can efficiently promote the development of a low-carbon future. In recent decades, numerous inexpensive and fruitful nickel-based materials (metallic Ni, Ni-alloys, oxides/hydroxides, chalcogenides, nitrides and phosphides) have been explored as potential energy saving monofunctional and bifunctional electrocatalysts for urea electrolysis in alkaline solution. In this review, we start with a discussion about the basics and fundamentals of urea electrolysis, including the urea oxidation reaction (UOR) and the hydrogen evolution reaction (HER), and then discuss the strategies for designing electrocatalysts for the UOR, HER and both reactions (bifunctional). Next, the catalytic performance, mechanisms and factors including morphology, composition and electrode/electrolyte kinetics for the ameliorated and diminished activity of the various aforementioned nickel-based electrocatalysts for urea electrolysis, including monofunctional (UOR or HER) and bifunctional (UOR and HER) types, are summarized. Lastly, the features of persisting challenges, future prospects and expectations of unravelling the bifunctional electrocatalysts for urea-based energy conversion technologies, including urea electrolysis, urea fuel cells and photoelectrochemical urea splitting, are illuminated.

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Superior catalytic activity of α-Ni(OH)₂ for urea electrolysis

Abstract: α-Ni(OH)2 exhibits a higher intrinsic UOR catalytic activity and durable stability in comparison with its nickel hydroxide counterpart β-Ni(OH)2.

Cited by 26 publications

References 61 publications

Insights into the activity of nickel boride/nickel heterostructures for efficient methanol electrooxidation

Insights into the activity of nickel boride/nickel heterostructures for efficient methanol electrooxidation

Promoted glucose electrooxidation at Ni(OH)₂/graphene layers exfoliated facilely from carbon waste material

Recent Development of Nickel-Based Electrocatalysts for Urea Electrolysis in Alkaline Solution

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Superior catalytic activity of α-Ni(OH)2 for urea electrolysis

Abstract: α-Ni(OH)2 exhibits a higher intrinsic UOR catalytic activity and durable stability in comparison with its nickel hydroxide counterpart β-Ni(OH)2.

Cited by 26 publications

References 61 publications

Insights into the activity of nickel boride/nickel heterostructures for efficient methanol electrooxidation

Insights into the activity of nickel boride/nickel heterostructures for efficient methanol electrooxidation

Promoted glucose electrooxidation at Ni(OH)2/graphene layers exfoliated facilely from carbon waste material

Recent Development of Nickel-Based Electrocatalysts for Urea Electrolysis in Alkaline Solution

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Superior catalytic activity of α-Ni(OH)₂ for urea electrolysis

Promoted glucose electrooxidation at Ni(OH)₂/graphene layers exfoliated facilely from carbon waste material