Amorphous nickel tungstate nanocatalyst boosts urea electrooxidation

Wang, Lu; Zhu, Shangqian; Wang, Yian; Liu, Zhipeng; Liu, Yu‐Shen; Wang, Qi; Gu, Meng; Li, Kedi; Sun, Xiaobin; Yang, Liwei; Shao, Minhua

doi:10.1016/j.cej.2023.141826

Cited by 13 publications

(10 citation statements)

References 66 publications

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“…amorphous catalyst is longer than that on crystalline catalyst by DFT calculation. [73] Zhuo et al chose amorphous NiMoO 4 to modify Ni 3 S 2 to construct a crystalline/amorphous heterostructure catalyst (Ni 3 S 2 -NiMoO 4 /NF). [146] A clear peak of Mo species could not be observed in the XRD pattern, but the characteristic peak of NiMoO 4 was detected by Raman spectroscopy.…”

Section: Promoting Co 2 Desorption To Improve Stabilitymentioning

confidence: 99%

“…[ 72 ] Shao et al thought that the disordered atomic arrangement and the resulting nonequilibrium ligand field in an amorphous state make it easier for Ni 2+ to lose electrons and form active phase NiOOH. [ 73 ] They analyzed the Ni element valence states of amorphous NiWO 4 (a‐NiWO 4 ) and crystalline NiWO 4 (c‐NiWO 4 ). The results show that the binding energy of all peaks in a‐NiWO 4 is higher than that of c‐NiWO 4 , and the composition of Ni 3+ is also higher than that of c‐NiWO 4 , which indicates that the amorphous state contributes to the formation of NiOOH.…”

Section: Modulation Strategies For Improving Uor Catalytic Performancementioning

confidence: 99%

“…Shao et al tested the time‐resolved IRRAS spectra of amorphous NiWO 4 (a‐NiWO 4 ) and crystalline NiWO 4 (c‐NiWO 4 ) at open circuit voltage. [ 73 ] The self‐dissociation of urea on a‐NiWO 4 can be observed without adding voltage, but not on c‐NiWO 4 , indicating that the amorphous state improves the adsorption of urea. DFT calculations further proved that the bond length of urea adsorbed on the surface of a‐NiWO 4 is shorter and the Gibbs free energy is more negative.…”

Section: Modulation Strategies For Improving Uor Catalytic Performancementioning

confidence: 99%

“…Shao et al proved that the distance of COO* on amorphous catalyst is longer than that on crystalline catalyst by DFT calculation. [ 73 ] Zhuo et al. chose amorphous NiMoO 4 to modify Ni 3 S 2 to construct a crystalline/amorphous heterostructure catalyst (Ni 3 S 2 ‐NiMoO 4 /NF).…”

Section: Modulation Strategies For Improving Uor Catalytic Performancementioning

confidence: 99%

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Modulation Strategies for the Preparation of High‐Performance Catalysts for Urea Oxidation Reaction and Their Applications

Huang

Shuai

Zhan

et al. 2023

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Compared with the traditional electrolysis of water to produce hydrogen, urea‐assisted electrolysis of water to produce hydrogen has significant advantages and has received extensive attention from researchers. Unfortunately, urea oxidation reaction (UOR) involves a complex six‐electron transfer process leading to high overpotential, which forces researchers to develop high‐performance UOR catalysts to drive the development of urea‐assisted water splitting. Based on the UOR mechanism and extensive literature research, this review summarizes the strategies for preparing highly efficient UOR catalysts. First, the UOR mechanism is introduced and the characteristics of excellent UOR catalysts are pointed out. Aiming at this, the following modulation strategies are proposed to improve the catalytic performance based on summarizing various literature: 1) Accelerating the active phase formation to reduce initial potential; 2) Creating double active sites to trigger a new UOR mechanism; 3) Accelerating urea adsorption and promoting C─N bond cleavage to ensure the effective conduct of UOR; 4) Promoting the desorption of CO2 to improve stability and prevent catalyst poisoning; 5) Promoting electron transfer to overcome the inherent slow dynamics of UOR; 6) Increasing active sites or active surface area. Then, the application of UOR in electrochemical devices is summarized. Finally, the current deficiencies and future directions are discussed.

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Section: Promoting Co 2 Desorption To Improve Stabilitymentioning

confidence: 99%

Section: Modulation Strategies For Improving Uor Catalytic Performancementioning

confidence: 99%

Section: Modulation Strategies For Improving Uor Catalytic Performancementioning

confidence: 99%

Section: Modulation Strategies For Improving Uor Catalytic Performancementioning

confidence: 99%

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Modulation Strategies for the Preparation of High‐Performance Catalysts for Urea Oxidation Reaction and Their Applications

Huang

Shuai

Zhan

et al. 2023

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“…Among these reactions, the theoretical voltage for the urea oxidation reaction (UOR) is only 0.37 V. [17][18][19][20] After the UOR, urea decomposes into inert N 2 and CO 2 . 21,22 It also has the advantages of being harmless, low cost, and stable, and is considered one of the most promising alternatives to the OER. 23,24 Replacing the OER with the UOR for electrocatalytic hydrogen production can effectively solve the problem of slow kinetics and improve energy conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

The synthesis of W–Ni₃S₂/NiS nanosheets with heterostructure as a high-efficiency catalyst for urea oxidation

Han

et al. 2023

Dalton Trans.

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Enhanced electrocatalytic activity of graphitic carbon nitride‐supported Ni/NiO microflower structures for urea electro‐oxidation

Taha,

Attia,

Medany

2023

J of Chemical Tech & Biotech

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BACKGROUNDIn this study, a 3D heterostructure of Ni/NiO microflower‐decorated graphitic carbon nitride (g‐C3N4) with different ratios was synthesized using the hydrothermal method. The aim was to investigate the electrocatalytic activity of these materials toward urea electrochemical oxidation (UEO) and compare them with various Ni‐based catalysts in NaOH solution.RESULTSThe crystal structure and morphology of the synthesized electrocatalysts were characterized using X‐ray diffraction, transmission electron microscopy, scanning electron microscopy, and energy‐dispersive X‐ray spectroscopy. Among the different ratios studied, the Ni/NiO 30%/g‐C3N4 nanocomposites exhibited the highest electrocatalytic activity and stability. The anodic current density of Ni/NiO 30%/g‐C3N4 was approximately 1.5 times higher than that of NiO microflowers, indicating its superior capability for facilitating the electro‐oxidation of urea at its surface. Furthermore, the Ni/NiO 30%/g‐C3N4 composition showed a lower Tafel slope, low charge transfer resistance, and higher current density, making it a promising material for urea fuel cells.CONCLUSIONThe results of this study highlight the significance of the Ni/NiO 30%/g‐C3N4 composition in achieving efficient electrocatalytic activity for UEO. The 3D heterostructure design, combining the synergistic effects of Ni/NiO and g‐C3N4, offers enhanced performance and stability. These findings contribute to the development of advanced electrocatalysts for urea fuel cells, with potential applications in energy conversion systems. Further research should focus on optimizing the composition and exploring the underlying mechanisms to improve the performance of these electrocatalysts for practical applications. © 2023 Society of Chemical Industry (SCI).

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Amorphous nickel tungstate nanocatalyst boosts urea electrooxidation

Cited by 13 publications

References 66 publications

Modulation Strategies for the Preparation of High‐Performance Catalysts for Urea Oxidation Reaction and Their Applications

Modulation Strategies for the Preparation of High‐Performance Catalysts for Urea Oxidation Reaction and Their Applications

The synthesis of W–Ni₃S₂/NiS nanosheets with heterostructure as a high-efficiency catalyst for urea oxidation

Enhanced electrocatalytic activity of graphitic carbon nitride‐supported Ni/NiO microflower structures for urea electro‐oxidation

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Amorphous nickel tungstate nanocatalyst boosts urea electrooxidation

Cited by 13 publications

References 66 publications

Modulation Strategies for the Preparation of High‐Performance Catalysts for Urea Oxidation Reaction and Their Applications

Modulation Strategies for the Preparation of High‐Performance Catalysts for Urea Oxidation Reaction and Their Applications

The synthesis of W–Ni3S2/NiS nanosheets with heterostructure as a high-efficiency catalyst for urea oxidation

Enhanced electrocatalytic activity of graphitic carbon nitride‐supported Ni/NiO microflower structures for urea electro‐oxidation

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The synthesis of W–Ni₃S₂/NiS nanosheets with heterostructure as a high-efficiency catalyst for urea oxidation