Temperature effect on crystallinity and chemical states of nickel hydroxide as alternative superior catalyst for urea electrooxidation

Gan, Qiuping; Cheng, Xinjian; Chen, Judan; Wang, Dongsheng; Wang, Benzhi; Tian, Jianniao; Isimjan, Tayirjan Taylor; Yang, Xiulin

doi:10.1016/j.electacta.2019.01.150

Cited by 54 publications

(17 citation statements)

References 54 publications

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“…From the Raman spectra, it is seen that a Ni(OH) 2 nanosheet exhibits a peak at 3650 cm −1 corresponding to the symmetric stretching of the hydroxyl group ( ν OH). Also, a peak at 310 and 473 cm −1 is assigned to Eg and A1g lattice mode of NiOH, respectively 39 . The band at 1044 and 2428 cm −1 are originated from the nitrate ions located in the interlayer space 40 .…”

Section: Resultsmentioning

confidence: 97%

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Synthesis of nickel hydroxide/reduced graphene oxide composite thin films for water splitting application

et al. 2020

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Facile synthesis of highly efficient and low-cost electrocatalyst for oxygen evolution reaction (OER) is important for large-scale hydrogen production. Herein, nickel hydroxide/reduced graphene oxide (Ni(OH) 2 /rGO) composite thin film was fabricated using dip-coating followed by electrodeposition method on Ni foam substrate at room temperature. The deposited composite film shows amorphous nature with ultra-thin Ni(OH) 2 nanosheets vertically coated on rGO surface, which provides large electrochemical surface area and abundant catalytically active sites. It exhibits a low overpotential of 260 mV @10 mA cm −2 as compared to the pristine electrodes and excellent long-term stability up to 20 hours in 1 M KOH solution. The electrochemical active surface area and Tafel slope of the composite electrode are 20.2 mF cm −2 and 35 mV dec −1 , respectively. The superior water oxidation performance is a result of high catalytically active sites and improved conductivity of the composite electrode.

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Section: Resultsmentioning

confidence: 97%

“…Also, a peak at 310 and 473 cm −1 is assigned to Eg and A1g lattice mode of Ni OH, respectively. 39 The band at 1044 and 2428 cm −1 are originated from the nitrate ions located in the interlayer space. 40 corresponding to D band and G band of graphene, which is consistent with Raman spectrum of rGO.…”

Section: Electrochemical Measurementmentioning

confidence: 99%

Synthesis of nickel hydroxide/reduced graphene oxide composite thin films for water splitting application

et al. 2020

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“…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%

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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“…However, Ni(OH) 2 can further react with OH − from the electrolyte to regenerate NiOOH active sites. Apart from the formation of Ni(OH) 2 in alkaline media, the direct utilization and mechanistic studies on modified Ni(OH) 2 are also reported for urea electrolysis in earlier published works …”

Section: Urea Electrolysis For Hydrogen Productionmentioning

confidence: 99%

Designing Advanced Catalysts for Energy Conversion Based on Urea Oxidation Reaction

Zhu

Liang

Zou

2020

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415

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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Temperature effect on crystallinity and chemical states of nickel hydroxide as alternative superior catalyst for urea electrooxidation

Cited by 54 publications

References 54 publications

Synthesis of nickel hydroxide/reduced graphene oxide composite thin films for water splitting application

Synthesis of nickel hydroxide/reduced graphene oxide composite thin films for water splitting application

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

Designing Advanced Catalysts for Energy Conversion Based on Urea Oxidation Reaction

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