3D NiO nanowalls grown on Ni foam for highly efficient electro-oxidation of urea

Zhan, Sihui; Zhou, Zhiruo; Liu, Manman; Jiao, Yang; Wang, Haitao

doi:10.1016/j.cattod.2018.02.049

Cited by 57 publications

(30 citation statements)

References 37 publications

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“…The decrease of the onset potential is related to a change in the required activation energy for the process, and a suitable catalyst enhances the reaction rate by decreasing the activation energy [46]. It is important to point out that the onset potential starts at the similar potential of the conversion from Ni 2+ to Ni 3+ , confirmed that NiOOH is the active phase for the urea electro-oxidation reaction [37,38].…”

Section: Resultsmentioning

confidence: 86%

“…The peak in the forward scan corresponds to the Ni 2+ oxidation to Ni 3+ [Ni(OH) 2 to NiOOH] and the peak in the backward scan is related to the Ni 3+ reduction to Ni 2+ [2,36]. It is important to point out that NiOOH is the phase responsible for urea electro-oxidation, and not Ni(OH) 2 [2,37]. As can be seen, the current related to the nickel oxidation and reduction process increases from the material 3-Ni/CF to the 12-Ni/CF, which might be related to a higher amount of nickel deposited on the CP due to longer time deposition.…”

Section: Resultsmentioning

confidence: 99%

“…The current density from urea electro-oxidation on 3-Ni/CP at the end of CA experiment was 44% higher than on 6-Ni/CP and 133% on 12-Ni/CP. The slow decay of the current density over time is induced either by the gas bubbles (i.e., N 2 , CO 2 ) produced from urea electrooxidation or by the blockage of the active site due to the intermediate products [37,48], e.g. CO can cause the deactivation of NiOOH which is actually the active phase to promote urea electro-oxidation [49].…”

Section: Resultsmentioning

confidence: 99%

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Nickel nanoparticles supported by commercial carbon paper as a catalyst for urea electro-oxidation

Coelho

Barbosa

Liu

et al. 2020

Mater Renew Sustain Energy

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Nickel nanoparticles supported by commercial carbon paper (CP) are prepared by pulsed laser deposition with deposition time of 3, 6, and 12 min as a catalyst for urea electro-oxidation. The surface conditions and the morphologies of the prepared electrodes have been characterized by Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. Urea electro-oxidation reaction in KOH solution on the Ni/CP electrodes is investigated by cyclic voltammetry and chronoamperometry. The results show that the electrode with less Ni nanoparticle agglomeration shows higher peak current density, which was achieved in the 3 min deposition samples when normalized by electroactive surface areas. However, the highest current normalized by the area of the carbon paper was achieved in the 6 min deposition sample due to the larger quantity of Ni nanoparticles. All the samples show good stability. Our results suggest that the low density, low cost, and environmental friendly CP can be used as support for Ni nanoparticle as a catalyst for urea electro-oxidation. It thus has great potential for many applications involving urea oxidation, such as wastewater treatments.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Nickel nanoparticles supported by commercial carbon paper as a catalyst for urea electro-oxidation

Coelho

Barbosa

Liu

et al. 2020

Mater Renew Sustain Energy

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“…Fig. 1b) and nanowalls [16] (Fig. 1b,c). The hydroxy nanowalls are apparent at magnifications above ~2000x and coat all surfaces exposed to the hydrothermal bath.…”

Section: Electrochemical Cell and Experimental Parametersmentioning

confidence: 95%

Electrooxidation of Urea and Creatinine on Nickel Foam-based Electrocatalysts

Carpenter¹,

Stuve²

2020

Preprint

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“…These design concepts take the characteristics of urea molecules into consideration, which aims to alter either the morphological or electronic structures of the catalysts. The common approaches include metallic compound formation (e.g., oxides, hydroxides, nitrides, phosphides, and sulfides), bimetallic incorporation, and composite/heterostructure formation . Apart from the individual application of each strategy, they can also be applied simultaneously to achieve synergistic effects …”

Section: Introductionmentioning

confidence: 99%

Designing Advanced Catalysts for Energy Conversion Based on Urea Oxidation Reaction

Zhu

Liang

Zou

2020

Small

418

270

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Urea oxidation reaction (UOR) is the underlying reaction that determines the performance of modern urea‐based energy conversion technologies. These technologies include electrocatalytic and photoelectrochemical urea splitting for hydrogen production and direct urea fuel cells as power engines. They have demonstrated great potentials as alternatives to current water splitting and hydrogen fuel cell systems with more favorable operating conditions and cost effectiveness. At the moment, UOR performance is mainly limited by the 6‐electron transfer process. In this case, various material design and synthesis strategies have recently been reported to produce highly efficient UOR catalysts. The performance of these advanced catalysts is optimized by the modification of their structural and chemical properties, including porosity development, heterostructure construction, defect engineering, surface functionalization, and electronic structure modulation. Considering the rich progress in this field, the recent advances in the design and synthesis of UOR catalysts for urea electrolysis, photoelectrochemical urea splitting, and direct urea fuel cells are reviewed here. Particular attention is paid to those design concepts, which specifically target the characteristics of urea molecules. Moreover, challenges and prospects for the future development of urea‐based energy conversion technologies and corresponding catalysts are also discussed.

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3D NiO nanowalls grown on Ni foam for highly efficient electro-oxidation of urea

Cited by 57 publications

References 37 publications

Nickel nanoparticles supported by commercial carbon paper as a catalyst for urea electro-oxidation

Nickel nanoparticles supported by commercial carbon paper as a catalyst for urea electro-oxidation

Electrooxidation of Urea and Creatinine on Nickel Foam-based Electrocatalysts

Designing Advanced Catalysts for Energy Conversion Based on Urea Oxidation Reaction

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