Hierarchical flower-like amorphous nickel sulfide/crystalline CoFe layered double hydroxide heterostructure for overall water splitting

Wang, Zhenyu; Mou, Xiaoming; Li, Dongrun; Song, Caixia; Wang, Debao

doi:10.1016/j.ijhydene.2022.09.019

Cited by 11 publications

(4 citation statements)

References 45 publications

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“…Compared with the NC-NCP sample, the peak positions of Ni 2p and Co 2p in the Ni x Se y /NC-NCP sample slightly shift to higher binding energies, which is attributed to the introduction of a Se atom with higher electronegativity and the strong electronic interaction among various components . Simultaneously, the in situ generated Ni 3+ and Co 3+ species on the surface of the Ni x Se y /NC-NCP sample cannot be ignored because the Ni 3+ and Co 3+ species with high valence are universally acknowledged as real active sites in the OER process, which play a very important role in optimizing the kinetics of the OER. ,, For the HRXPS spectrum of P 2p (Figure c), the characteristic peak at 133.0 eV is usually assigned to the oxidation of phosphate species (P–O) . Furthermore, the Se LMM Auger peak can be observed in the HRXPS spectrum of P 2p for the Ni x Se y /NC-NCP sample due to the formation of Ni x Se y species.…”

Section: Resultsmentioning

confidence: 99%

“…49 Simultaneously, the in situ generated Ni 3+ and Co 3+ species on the surface of the Ni x Se y / NC-NCP sample cannot be ignored because the Ni 3+ and Co 3+ species with high valence are universally acknowledged as real active sites in the OER process, which play a very important role in optimizing the kinetics of the OER. 1,50,51 For the HRXPS spectrum of P 2p (Figure 3c), the characteristic peak at 133.0 eV is usually assigned to the oxidation of phosphate species (P−O). 52 Furthermore, the Se LMM Auger peak can be observed in the HRXPS spectrum of P 2p for the Ni x Se y / NC-NCP sample due to the formation of Ni x Se y species.…”

Section: Structural Characterizationmentioning

confidence: 99%

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NiCo-Based Heterostructure on Nickel Foam for Boosting Urea-Assisted Electrolytic Hydrogen Production

Zhang,

Fang,

Zhang

et al. 2023

ACS Appl. Nano Mater.

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Urea-assisted electrolytic water splitting is recognized as a high-efficiency and energy-saving hydrogen production technology because of its advantages of reducing the thermodynamic electrode potential and decomposing pollutant. Furthermore, the reasonably designed heterojunction catalyst can significantly accelerate the kinetic rate of the urea oxidation reaction (UOR). In this paper, a four-component (including NiCo, NiCoP, Ni 3 Se 2 , and NiSe) NiCo-based heterostructure (expressed as Ni x Se y /NC-NCP) was successfully synthesized by combining the electrodeposition method and high-temperature selenization strategy, which consists of an interlaced chainlike structure and an interconnected nanosphere structure. As expected, the Ni x Se y /NC-NCP heterostructure only requires a low potential of 1.36 V to enable the UOR to deliver a current density of 100 mA cm −2 , which is 208 mV lower than that of the corresponding oxygen evolution reaction (OER). The results of physical characterizations confirm that the surface of Ni x Se y /NC-NCP was reconstructed during the electrocatalytic UOR process; that is, active species such as CoOOH and NiOOH were generated on the surface. The Pt/ C||Ni x Se y /NC-NCP electrolyzer composed of commercial Pt/C and self-supporting Ni x Se y /NC-NCP is used for the urea-assisted water splitting, which only needs low cell voltages of 1.40 and 1.45 V to drive the current densities of 100 and 200 mA cm −2 , respectively. This study promotes research on hierarchical heterojunction catalysts to enhance the electrocatalytic UOR performance, effectively reducing the energy required for electrochemical hydrogen production.

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Section: Resultsmentioning

confidence: 99%

Section: Structural Characterizationmentioning

confidence: 99%

NiCo-Based Heterostructure on Nickel Foam for Boosting Urea-Assisted Electrolytic Hydrogen Production

Zhang,

Fang,

Zhang

et al. 2023

ACS Appl. Nano Mater.

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Section: Methods For the Controllable Synthesis Of Amorphous Nanomate...mentioning

confidence: 99%

“…According to Wang's research group, NiS/CoFe bilayer hydroxide heterostructures (NiS/LDH/NF) were constructed on Ni foam by hydrothermal and electrodeposition methods (Figure 53e−h). 332 Amorphous NiS was deposited on the surface of crystalline LDH mesh nanosheets to form hierarchical flower-like structures. The deposition of amorphous NiS can control the morphology and electronic structure of NiS/LDH/ NF.…”

Section: Synthesis Of 3d Amorphous Nanomaterialsmentioning

confidence: 99%

Recent Progress of Amorphous Nanomaterials

Kang

Yang

et al. 2023

Chem. Rev.

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Amorphous materials are metastable solids with only short-range order at the atomic scale, which results from local intermolecular chemical bonding. The lack of long-range order typical of crystals endows amorphous nanomaterials with unconventional and intriguing structural features, such as isotropic atomic environments, abundant surface dangling bonds, highly unsaturated coordination, etc. Because of these features and the ensuing modulation in electronic properties, amorphous nanomaterials display potential for practical applications in different areas. Motivated by these elements, here we provide an overview of the unique structural features, the general synthetic methods, and the potential for applications covered by contemporary research in amorphous nanomaterials. Furthermore, we discussed the possible theoretical mechanism for amorphous nanomaterials, examining how the unique structural properties and electronic configurations contribute to their exceptional performance. In particular, the structural benefits of amorphous nanomaterials as well as their enhanced electrocatalytic, optical, and mechanical properties, thereby clarifying the structure−function relationships, are highlighted. Finally, a perspective on the preparation and utilization of amorphous nanomaterials to establish mature systems with a superior hierarchy for various applications is introduced, and an outlook for future challenges and opportunities at the frontiers of this rapidly advancing field is proposed.

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Modulating electronic structure and sulfur p-band center by anchoring amorphous Ni@NiSx on crystalline CdS for expediting photocatalytic H2 evolution

Zhang,

Wu,

et al. 2024

Applied Catalysis B: Environmental

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Hierarchical flower-like amorphous nickel sulfide/crystalline CoFe layered double hydroxide heterostructure for overall water splitting

Cited by 11 publications

References 45 publications

NiCo-Based Heterostructure on Nickel Foam for Boosting Urea-Assisted Electrolytic Hydrogen Production

NiCo-Based Heterostructure on Nickel Foam for Boosting Urea-Assisted Electrolytic Hydrogen Production

Recent Progress of Amorphous Nanomaterials

Modulating electronic structure and sulfur p-band center by anchoring amorphous Ni@NiSx on crystalline CdS for expediting photocatalytic H2 evolution

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