Interface engineering of NiO/RuO2 heterojunction nano-sheets for robust overall water splitting at large current density

Yu, Tianqi; Xu, Qinglian; Luo, Lin; Liu, Chenrui; Yin, Shibin

doi:10.1016/j.cej.2021.133117

Cited by 72 publications

(37 citation statements)

References 60 publications

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“…However, the intrinsic shortcomings of transition metal/metallic oxides, such as inferior conductivity, limited active sites, and uneven dispersion, remain huge obstacles to the applications in oxygen-related electrocatalysis. Advanced strategies have been developed for enhancing electrical conductivity and modulating the electronic structure, such as the construction of heterojunctions and metal (Fe, Al, Ni, etc.) doping. − For instance, Al was doped into Co 3 O 4 to ameliorate electronic environments of Co 3 O 4 , which improved catalytic kinetics toward the OER .…”

Section: Introductionmentioning

confidence: 99%

Curving Engineering of Hollow Concave-Shaped Rhombic Dodecahedrons of N-Doped Carbon Encapsulated with Fe-Doped Co/Co₃O₄ Nanoparticles for an Efficient Oxygen Reduction Reaction and Zn–Air Batteries

Kong

Weng

et al. 2022

ACS Sustainable Chem. Eng.

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For oxygen reduction reaction (ORR) electrocatalysts, hybrids based on transition metal compounds with nitrogen-doped carbonaceous materials show great potential for replacing state-of-the-art noble metal-based catalysts. Although great efforts have been devoted to improving metal loading to enhance electrocatalytic properties, a limited number of active sites are exposed on the reaction interface, contributing to the catalytic reaction. Engineering morphologies is one of the effective strategies to provide an abundant surface area with highly accessible active sites. Herein, Fe-doped Co/Co3O4 nanoparticles encapsulated in a nitrogen-doped carbon matrix (Fe–Co/Co3O4@NC) with a unique hollow concave-shaped rhombic dodecahedron structure were synthesized by an NaCl-assisted strategy. The hollow concave-shaped structure with an increased surface area leads to the adequate utilization of active sites and improved mass diffusion during the ORR. The curving effect caused by a hollow concave-shaped structure accounts for the high-frequency collisions of oxygen molecules at the inner and outer surfaces. Excellent ORR activity (E 1/2 = 0.84 V vs reversible hydrogen electrode) is achieved on the Fe–Co/Co3O4@NC catalysts. A home-made Zn–air battery catalyzed by Fe–Co/Co3O4@NC demonstrates a desirable performance for practical applications.

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Section: Introductionmentioning

confidence: 99%

Curving Engineering of Hollow Concave-Shaped Rhombic Dodecahedrons of N-Doped Carbon Encapsulated with Fe-Doped Co/Co₃O₄ Nanoparticles for an Efficient Oxygen Reduction Reaction and Zn–Air Batteries

Kong

Weng

et al. 2022

ACS Sustainable Chem. Eng.

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“…However, the O1s spectrum of PANI/RuO 2 -38 shifts to higher binding energy (531.4, 532.3, and 533.3 eV), which is attributed to the electronic interaction of PANI and RuO 2 . [40] In addition, the N 2 adsorption isotherms further confirms that the introduction of PANI can prevent RuO 2 nanosheets selfstacking (Figure S2). The low N 2 uptake of RuO 2 reveals its nearly nonporous structure.…”

Section: Chemelectrochemmentioning

confidence: 58%

Controllable Intercalated Polyaniline Nanofibers Highly Enhancing the Utilization of Delaminated RuO₂ Nanosheets for High‐Performance Hybrid Supercapacitors

et al. 2022

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Ruthenium oxide (RuO2) and polyaniline (PANI) are attracting extensive attention as electrode materials due to their remarkable pseudocapacitance. However, RuO2 suffers from low utilization and PANI sustains poor stability. Herein, both defects were optimized by designing intercalated‐structure PANI/RuO2 composites, which were fabricated for the first time by controllable chemical polymerization of aniline on the delaminated RuO2 nanosheets. Intercalated PANI nanofibers not only highly prevent the RuO2 nanosheets from their reassembling as well as increase the interlayer spacing among RuO2 nanosheets but also alleviate the swelling/shrinking of PANI during charge‐discharge progress. In comparison to the pristine RuO2 nanosheets, the obtained intercalated structure is beneficial for creating channels for better ion transfer and electron transport, which leads to a high‐efficiency utilization of RuO2 nanosheets. The optimized PANI/RuO2‐38 electrode with a RuO2 content of 61.7 wt% shows the highest utilization of 72.1 % of RuO2, resulting in the highest specific capacity of 816 F g−1. The asymmetric supercapacitor PANI/RuO2//AC offers a high energy density of 25.7 Wh kg−1 at 375 kW kg−1, further indicating a good potential as energy‐storage device.

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“…The peaks with binding energies at 853.4 and 870.6 eV are ascribed to the Ni 2p 3/2 and Ni 2p 1/2 of Ni-P, respectively, and peaks at 856.6 and 874.5 eV correspond to the Ni 2p 3/2 and Ni 2p 1/2 of Ni-O. [35] The peaks at 861.1 and 879.2 eV are two satellite peaks. P 2p spectrum can be deconvoluted into three peaks at 129.6, 130.5, and 134.0 eV (Figure 4d), which are assigned to 2p 3/2 , 2p 1/2 of P-Ni and the oxidized P specie, [36] respectively.…”

Section: ( )mentioning

confidence: 96%

Elaboration of Ni₂P@C Composites with Hollow Porous Structure for Enhanced Overall Water Splitting

Wang

Ding

Zhao

et al. 2022

Adv Materials Inter

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Ir-based noble metal materials respectively, due to their high activity. But the high cost, resource scarcity, and poor stability of these noble metal materials significantly hamper widespread applications. [4] Accordingly, the development of non-noble metal bifunctional electrocatalysts with superior activity and durability is needed eagerly for HER and OER. [5] Transition metal phosphides (TMPs), benefiting from unique crystal structures, tailorable electronic states, high reactivity and low cost, present a great promise for electrocatalytic water splitting. [6,7] Because the electronegativity of P is higher compared with the metals, the electron density transfer from metal ions to P species, resulting in the superficial metal and P sites act as appropriate hydrideacceptor and proton acceptor centers, respectively. [8] Besides, the introduction of P elements not only weaken the bond strength between the metals (as hydride acceptor) and hydride, but also optimize the behavior of the absorption and desorption of intermediates to facilitate the charge transport process and accelerate the generation of hydrogen and oxygen. [9,10] Since 2005, nickel phosphide (Ni 2 P) has been indicated the potential superiority as HER catalysts by Liu and Rodriguez, due to the structural and electronic similarities to biological hydrogen-evolving catalyst [NiFe] hydrogenases enzyme, based on density functional theory (DFT) calculations. [11] In 2013, Popczun and co-workers reported that hollow Ni 2 P nanoparticles with a high density of the exposed (001) crystal plane have been experimentally confirmed the high HER electrocatalytic. [9] Moreover, Ni 2 P is reported to serve as an interesting pre-catalyst toward the OER. For example, Song et al. developed a Janus structure Ni 2 P catalyst, the core-shell Ni 2 P/NiO x act as the active form for OER, generating in situ under catalytic conditions, and the alkaline electrolyzer achieve the overall water splitting with a current density of 10 mA cm -2 at 1.63 V. [12] Sun et al. synthesized porous multishelled Ni 2 P hollow microspheres with large surface area and abundant interior space facilitate to the ion diffusion and reaction kinetic. [13] Additionally, an extra NiOOH layer is formed under anodic polarization, and the Ni 2 P/NiOOH derivative is superior to RuO 2 catalysts for catalyzing OER. Even so, their intrinsic activity for overall water splitting is kinetically retarded owing to the poor stability and insufficient conductivity.The electrocatalytic water splitting is greatly affected by overpotential, stability, and accessibility of active sites. Designing appropriate active components and tailoring their microstructure are crucial to improve electrocatalytic performance. Herein, using metal organic framework (MOF) as template, novel Ni 2 P@C composites are prepared as bifunctional catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The best Ni 2 P@C-350 sample has a small onset overpotential (η) of 57 mV, and up to 148 and 285 mV to afford 10 a...

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Interface engineering of NiO/RuO2 heterojunction nano-sheets for robust overall water splitting at large current density

Cited by 72 publications

References 60 publications

Curving Engineering of Hollow Concave-Shaped Rhombic Dodecahedrons of N-Doped Carbon Encapsulated with Fe-Doped Co/Co₃O₄ Nanoparticles for an Efficient Oxygen Reduction Reaction and Zn–Air Batteries

Curving Engineering of Hollow Concave-Shaped Rhombic Dodecahedrons of N-Doped Carbon Encapsulated with Fe-Doped Co/Co₃O₄ Nanoparticles for an Efficient Oxygen Reduction Reaction and Zn–Air Batteries

Controllable Intercalated Polyaniline Nanofibers Highly Enhancing the Utilization of Delaminated RuO₂ Nanosheets for High‐Performance Hybrid Supercapacitors

Elaboration of Ni₂P@C Composites with Hollow Porous Structure for Enhanced Overall Water Splitting

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Interface engineering of NiO/RuO2 heterojunction nano-sheets for robust overall water splitting at large current density

Cited by 72 publications

References 60 publications

Curving Engineering of Hollow Concave-Shaped Rhombic Dodecahedrons of N-Doped Carbon Encapsulated with Fe-Doped Co/Co3O4 Nanoparticles for an Efficient Oxygen Reduction Reaction and Zn–Air Batteries

Curving Engineering of Hollow Concave-Shaped Rhombic Dodecahedrons of N-Doped Carbon Encapsulated with Fe-Doped Co/Co3O4 Nanoparticles for an Efficient Oxygen Reduction Reaction and Zn–Air Batteries

Controllable Intercalated Polyaniline Nanofibers Highly Enhancing the Utilization of Delaminated RuO2 Nanosheets for High‐Performance Hybrid Supercapacitors

Elaboration of Ni2P@C Composites with Hollow Porous Structure for Enhanced Overall Water Splitting

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Curving Engineering of Hollow Concave-Shaped Rhombic Dodecahedrons of N-Doped Carbon Encapsulated with Fe-Doped Co/Co₃O₄ Nanoparticles for an Efficient Oxygen Reduction Reaction and Zn–Air Batteries

Curving Engineering of Hollow Concave-Shaped Rhombic Dodecahedrons of N-Doped Carbon Encapsulated with Fe-Doped Co/Co₃O₄ Nanoparticles for an Efficient Oxygen Reduction Reaction and Zn–Air Batteries

Controllable Intercalated Polyaniline Nanofibers Highly Enhancing the Utilization of Delaminated RuO₂ Nanosheets for High‐Performance Hybrid Supercapacitors

Elaboration of Ni₂P@C Composites with Hollow Porous Structure for Enhanced Overall Water Splitting