Flower-like manganese oxide with intercalated nickel ions (Ni3+) as a catalytic electrode material for urea oxidation

Peng, Yuan-yu; Wu, Mao‐Sung

doi:10.1016/j.electacta.2022.140022

Cited by 17 publications

(5 citation statements)

References 58 publications

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“…3 rming the oxygen environment presented on the nanoporous carbon surface. 17,22 Finally, Fig. 3(d) indicates that Ni 2P peaks appearing at 856.07 and 873.9 eV are Ni 2P 3/2 and peaks at 861.3 and 878.8 correspond to Ni 2P 1/2 , conrming the Ni is in +2 and +3 oxidation states, respectively, and the additional informal peaks at 860.7 eV and 880.2 eV correspond to the satellite peaks arising from surface oxidation.…”

Section: X-ray Photoelectron Spectral Analysismentioning

confidence: 97%

Spherical Ni/NiO nanoparticles decorated on nanoporous carbon (NNC) as an active electrode material for urea and water oxidation reactions

Chavan,

Tanwade,

Sapner

et al. 2023

RSC Adv.

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Section: X-ray Photoelectron Spectral Analysismentioning

confidence: 97%

Spherical Ni/NiO nanoparticles decorated on nanoporous carbon (NNC) as an active electrode material for urea and water oxidation reactions

Chavan,

Tanwade,

Sapner

et al. 2023

RSC Adv.

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“…In such cases, the loss of highly conductive carbon support undermines catalytic stability in long-term UOR tests. Apart from the catalysts with high Ni content, embedding active nickel ions (Ni 3+ ) in nanostructured MnO 2 has also been reported as a promising candidate [ 34 ]. Notably, leveraging nanostructured materials and integrating Ni-based catalysts with highly conductive materials guarantees rich and exposed edge sites, which are crucial for catalytic reaction.…”

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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“…In another study by Li et al at Sun Yat-Sen University, heteroatom doping engineering by Mn and N brought a synergistic effect to significantly boost the electrocatalytic urea oxidation over metallic nickel. They proved that the specific architecture composed of the hcp phase along with Mn doping engineering, endowing MnNi/NC with abundant active centers, facile charge transfer, and optimized electronic state with exposed Ni 3+ sites and oxygen vacancies on the surface during catalytic reactions and then leading to enhanced UOR activity. − Moreover, incorporating sulfur into Ni(OH) 2 nanosheets is reported to improve electron transport and increase the number of active sites, thus beneficial to the UOR activity . Among common anion doping elements, F has the highest electronegativity and is very active for electrochemical reactions but can also reconstruct the form of metal oxyhydroxide and create a defective structure. , …”

Section: Introductionmentioning

confidence: 99%

Crystalline-to-Amorphous Transformation and Charge Redistribution Induced by Anion–Cation Double Substitution on 3D Ni(OH)₂ Ultrathin Nanosheet Arrays Enable Urea-Assisted Energy-Saving Hydrogen Production

Le,

Ngo

et al. 2024

ACS Sustainable Chem. Eng.

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Amorphous catalysts possess substantially better catalytic activity toward water splitting than their crystalline counterparts. However, researchers have thus far focused on the crystalline rather than the amorphous phase due to the complexity of synthesis and characterization. Here, crystalline-to-amorphous transformation and charge redistribution induced by Fe and F double substitution on 3D Ni(OH) 2 ultrathin nanosheet arrays are reported as a highly active and stable bifunctional electrocatalyst for urea-assisted water electrolysis. It is unveiled that the synergistic effect of F and Fe dopant incorporation not only alters the electronic configuration for improved intrinsic activity but also creates abundant active sites rich in Ni 3+ , which are responsible for significantly accelerated reaction kinetics. First, our findings show that the collected F−Fe−Ni(OH) 2 catalyst exhibits excellent urea oxidation reaction (UOR) activity with an overpotential of 1.42 V to generate 250 mA cm −2 . Then, the as-prepared catalyst can play a dual role in a whole cell test, presenting a cell voltage of 1.68 V, which is 140 mV lower than that in the overall water-splitting system at 200 mA cm −2 . This work contributes a novel approach to synthesizing Ni-based materials for bifunctional electrocatalysts with enhancement of the catalytic activities of the UOR and the hydrogen evolution reaction.

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Flower-like manganese oxide with intercalated nickel ions (Ni3+) as a catalytic electrode material for urea oxidation

Cited by 17 publications

References 58 publications

Spherical Ni/NiO nanoparticles decorated on nanoporous carbon (NNC) as an active electrode material for urea and water oxidation reactions

Spherical Ni/NiO nanoparticles decorated on nanoporous carbon (NNC) as an active electrode material for urea and water oxidation reactions

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

Crystalline-to-Amorphous Transformation and Charge Redistribution Induced by Anion–Cation Double Substitution on 3D Ni(OH)₂ Ultrathin Nanosheet Arrays Enable Urea-Assisted Energy-Saving Hydrogen Production

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Flower-like manganese oxide with intercalated nickel ions (Ni3+) as a catalytic electrode material for urea oxidation

Cited by 17 publications

References 58 publications

Spherical Ni/NiO nanoparticles decorated on nanoporous carbon (NNC) as an active electrode material for urea and water oxidation reactions

Spherical Ni/NiO nanoparticles decorated on nanoporous carbon (NNC) as an active electrode material for urea and water oxidation reactions

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

Crystalline-to-Amorphous Transformation and Charge Redistribution Induced by Anion–Cation Double Substitution on 3D Ni(OH)2 Ultrathin Nanosheet Arrays Enable Urea-Assisted Energy-Saving Hydrogen Production

Contact Info

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Resources

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Crystalline-to-Amorphous Transformation and Charge Redistribution Induced by Anion–Cation Double Substitution on 3D Ni(OH)₂ Ultrathin Nanosheet Arrays Enable Urea-Assisted Energy-Saving Hydrogen Production