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Ping L, Minarik GE, Gao H, Cao J, Li T, Kitadai H, Ling X. Synthesis of 2D layered transition metal (Ni, Co) hydroxides via edge-on condensation. Sci Rep 2024; 14:3817. [PMID: 38361022 PMCID: PMC10869340 DOI: 10.1038/s41598-024-53969-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 02/07/2024] [Indexed: 02/17/2024] Open
Abstract
Layered transition metal hydroxides (LTMHs) with transition metal centers sandwiched between layers of coordinating hydroxide anions have attracted considerable interest for their potential in developing clean energy sources and storage technologies. However, two-dimensional (2D) LTMHs remain largely understudied in terms of physical properties and applications in electronic devices. Here, for the first time we report > 20 μm α-Ni(OH)2 2D crystals, synthesized from hydrothermal reaction. And an edge-on condensation mechanism assisted with the crystal field geometry is proposed to understand the 2D intra-planar growth of the crystals, which is also testified through series of systematic comparative studies. We also report the successful synthesis of 2D Co(OH)2 crystals (> 40 μm) with more irregular shape due to the slightly distorted octahedral geometry of the crystal field. Moreover, the detailed structural characterization of synthesized α-Ni(OH)2 are performed. The optical band gap energy is extrapolated as 2.54 eV from optical absorption measurements and the electronic bandgap is measured as 2.52 eV from reflected electrons energy loss spectroscopy (REELS). We further demonstrate its potential as a wide bandgap (WBG) semiconductor for high voltage operation in 2D electronics with a high breakdown strength, 4.77 MV/cm with 4.9 nm thickness. The successful realization of the 2D LTMHs opens the door for future exploration of more fundamental physical properties and device applications.
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Affiliation(s)
- Lu Ping
- Division of Materials Science and Engineering, Boston University, 15 St. Mary's Street, Boston, MA, 02215, USA
| | - Gillian E Minarik
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA, 02215, USA
| | - Hongze Gao
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA, 02215, USA
| | - Jun Cao
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA, 02215, USA
| | - Tianshu Li
- Division of Materials Science and Engineering, Boston University, 15 St. Mary's Street, Boston, MA, 02215, USA
| | - Hikari Kitadai
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA, 02215, USA
| | - Xi Ling
- Division of Materials Science and Engineering, Boston University, 15 St. Mary's Street, Boston, MA, 02215, USA.
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA, 02215, USA.
- The Photonics Center, Boston University, 8 St. Mary's Street, Boston, MA, 02215, USA.
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Hunt D, Oestreicher V, Mizrahi M, Requejo FG, Jobbágy M. Unveiling the Occurrence of Co(III) in NiCo Layered Electroactive Hydroxides: The Role of Distorted Environments. Chemistry 2020; 26:17081-17090. [PMID: 32721065 DOI: 10.1002/chem.202001944] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 07/27/2020] [Indexed: 11/06/2022]
Abstract
Co- and Ni-based layered hydroxides constitute a unique class of two-dimensional inorganic materials with exceptional chemical diversity, physicochemical properties and outstanding performance as supercapacitors and overall water splitting catalysts. Recently, the occurrence of Co(III) in these phases has been proposed as a key factor that enhance their electrochemical performance. However, the origin of this centers and control over its contents remains as an open question. We employed the Epoxide Route to synthesize a whole set of α-NiCo layered hydroxides. The PXRD and XAS characterization alert about the occurrence of Co(III) as a consequence of the increment in the Ni content. DFT+U simulation suggest that the shortening of the Co-O distance promotes a structural distortion in the Co environments, resulting in a double degeneration in the octahedral Co 3d orbitals. Hence, a strong modification of the electronic properties leaves the system prone to oxidation, by the appearance of Co localized electronic states on the Fermi level. This work combines a microscopic interpretation supported by a multiscale crystallochemical analysis, regarding the so-called synergistic redox behavior of Co and Ni, offering fundamental tools for the controllable design of highly efficient electroactive materials. To the best of our knowledge, this is the first computational-experimental investigation of the electronic and structural details of α-NiCo hydroxides, laying the foundation for the fine tuning of electronic properties in layered hydroxides.
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Affiliation(s)
- Diego Hunt
- Departamento de Física de la Materia Condensada, GIyA, CAC-CNEA, Instituto de Nanociencia y Nanotecnología, CNEA-CONICET, San Martin, Buenos Aires, B1650, Argentina
| | - Víctor Oestreicher
- INQUIMAE-DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, C1428EHA, Buenos Aires, Argentina.,Current address: Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Betrán 2, 46980, Valencia, Spain
| | - Martín Mizrahi
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CCT La Plata- CONICET, Diagonal 113 y 64, 1900, La Plata, Argentina.,Facultad de Ingeniería, Universidad Nacional de La Plata, calle 1 esq. 47, 1900, La Plata, Argentina
| | - Félix G Requejo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CCT La Plata- CONICET, Diagonal 113 y 64, 1900, La Plata, Argentina
| | - Matías Jobbágy
- INQUIMAE-DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, C1428EHA, Buenos Aires, Argentina
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Naruo Y, Uechi S, Sawada M, Funatsu A, Shimojo F, Ida S, Hara M. Ferromagnetic metal conversion directly from two-dimensional nickel hydroxide. NANOTECHNOLOGY 2020; 31:435602. [PMID: 32629443 DOI: 10.1088/1361-6528/aba304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We have demonstrated a direct metallic conversion from nickel hydroxide nanosheets to nickel metal nanostructures by thermal annealing in vacuum. The metal transition of the single-layer nanosheets deposited on a Si substrate was revealed by x-ray absorption near edge structure (XANES) measurements. The XANES signal significantly changed at annealing temperatures above 250 °C. The metal transition temperature coincides with the reported temperatures at which layered nickel hydroxide nanosheets are converted to nickel oxide nanosheets by calcination in air. Auger measurements confirmed that a dissociation of oxygen from the hydroxide nanosheet induces the metallic conversion. The converted nickel metallic structures exhibit ferromagnetic behavior revealed by x-ray magnetic circular dichroism (XMCD) measurement. Atomic force microscopy measurements indicate that diffusions of nickel atoms on the substrates leads to a structural change from a 2D-like structure to a particle-like structure.
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Affiliation(s)
- Yuhsuke Naruo
- Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
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Fraccarollo A, Zoccante A, Marchese L, Cossi M. Ab initio modeling of 2D and quasi-2D lead organohalide perovskites with divalent organic cations and a tunable band gap. Phys Chem Chem Phys 2020; 22:20573-20587. [PMID: 32893270 DOI: 10.1039/c9cp06851a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We describe theoretically the structure and properties of layered lead organohalide perovskites, considering purely bi-dimensional (2D) PbI4 layers, and quasi-2D systems where the inorganic layers are formed by more than one lead iodide sheet. The intercalating organic dications were designed to have low lying virtual orbitals (LUMO), so as to induce in the perovskite the appearance of virtual bands, localized in the organic layer, either close to the inorganic conduction band bottom or valence band top, or in some cases in the middle of the inorganic band gap. Such a feature is quite uncommon for this class of materials, and deserves attention since it allows one to tune the effective band gap of the material, possibly leading to the absorption of visible light and influencing the optical properties deeply. We discuss the effect of functional groups on the organic cations, and of the different symmetries used in geometry optimizations: a careful analysis of the contributions to the dispersion curves and band gaps was performed. The charge carrier mobility is also discussed, computing the conductivity over relaxation time and the effective masses for all the systems, with particular attention to the features related to the unusual organic intra-gap bands. All the structures were optimized at the DFT level, with inclusion of dispersion effects; dispersion curves were computed with full relativistic potentials, and the band gaps corrected for long range coulombic effects at the GW level. A semiempirical approach, based on the integration of charge carrier group velocities over a dense grid of k-points, was used to compute the conductivities and effective masses.
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Affiliation(s)
- Alberto Fraccarollo
- Dipartimento di Scienze e Innovazione Tecnologica (DISIT), Università del Piemonte Orientale, via T. Michel 11, I-15121, Alessandria, Italy.
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In-situ structure and catalytic mechanism of NiFe and CoFe layered double hydroxides during oxygen evolution. Nat Commun 2020; 11:2522. [PMID: 32433529 PMCID: PMC7239861 DOI: 10.1038/s41467-020-16237-1] [Citation(s) in RCA: 301] [Impact Index Per Article: 75.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 04/21/2020] [Indexed: 11/08/2022] Open
Abstract
NiFe and CoFe (MFe) layered double hydroxides (LDHs) are among the most active electrocatalysts for the alkaline oxygen evolution reaction (OER). Herein, we combine electrochemical measurements, operando X-ray scattering and absorption spectroscopy, and density functional theory (DFT) calculations to elucidate the catalytically active phase, reaction center and the OER mechanism. We provide the first direct atomic-scale evidence that, under applied anodic potentials, MFe LDHs oxidize from as-prepared α-phases to activated γ-phases. The OER-active γ-phases are characterized by about 8% contraction of the lattice spacing and switching of the intercalated ions. DFT calculations reveal that the OER proceeds via a Mars van Krevelen mechanism. The flexible electronic structure of the surface Fe sites, and their synergy with nearest-neighbor M sites through formation of O-bridged Fe-M reaction centers, stabilize OER intermediates that are unfavorable on pure M-M centers and single Fe sites, fundamentally accounting for the high catalytic activity of MFe LDHs.
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Garcia AC, Touzalin T, Nieuwland C, Perini N, Koper MTM. Enhancement of Oxygen Evolution Activity of Nickel Oxyhydroxide by Electrolyte Alkali Cations. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905501] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Amanda C. Garcia
- Leiden Institute of Chemistry Leiden University PO Box 9502 2300 RA Leiden The Netherlands
- Current address: Department of Sustainable Process and Energy Systems TNO Leeghwaterstraat 44 2628 CA Delft The Netherlands
| | - Thomas Touzalin
- Leiden Institute of Chemistry Leiden University PO Box 9502 2300 RA Leiden The Netherlands
| | - Celine Nieuwland
- Leiden Institute of Chemistry Leiden University PO Box 9502 2300 RA Leiden The Netherlands
| | - Nickson Perini
- Leiden Institute of Chemistry Leiden University PO Box 9502 2300 RA Leiden The Netherlands
- Instituto de Química de São Carlos Universidade de São Paulo Avenida Trabalhador São-Carlense 400 13569-590 São Carlos, SP Brazil
| | - Marc T. M. Koper
- Leiden Institute of Chemistry Leiden University PO Box 9502 2300 RA Leiden The Netherlands
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Garcia AC, Touzalin T, Nieuwland C, Perini N, Koper MTM. Enhancement of Oxygen Evolution Activity of Nickel Oxyhydroxide by Electrolyte Alkali Cations. Angew Chem Int Ed Engl 2019; 58:12999-13003. [DOI: 10.1002/anie.201905501] [Citation(s) in RCA: 115] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Indexed: 11/12/2022]
Affiliation(s)
- Amanda C. Garcia
- Leiden Institute of Chemistry Leiden University PO Box 9502 2300 RA Leiden The Netherlands
- Current address: Department of Sustainable Process and Energy Systems TNO Leeghwaterstraat 44 2628 CA Delft The Netherlands
| | - Thomas Touzalin
- Leiden Institute of Chemistry Leiden University PO Box 9502 2300 RA Leiden The Netherlands
| | - Celine Nieuwland
- Leiden Institute of Chemistry Leiden University PO Box 9502 2300 RA Leiden The Netherlands
| | - Nickson Perini
- Leiden Institute of Chemistry Leiden University PO Box 9502 2300 RA Leiden The Netherlands
- Instituto de Química de São Carlos Universidade de São Paulo Avenida Trabalhador São-Carlense 400 13569-590 São Carlos, SP Brazil
| | - Marc T. M. Koper
- Leiden Institute of Chemistry Leiden University PO Box 9502 2300 RA Leiden The Netherlands
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George K, Zhang X, Bieberle-Hütter A. Why does NiOOH cocatalyst increase the oxygen evolution activity of α-Fe2O3? J Chem Phys 2019; 150:041729. [DOI: 10.1063/1.5063771] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Kiran George
- Dutch Institute for Fundamental Energy Research (DIFFER), Electrochemical Materials and Interfaces (EMI), PO Box 6336, 5600 HH Eindhoven, The Netherlands
| | - Xueqing Zhang
- Dutch Institute for Fundamental Energy Research (DIFFER), Electrochemical Materials and Interfaces (EMI), PO Box 6336, 5600 HH Eindhoven, The Netherlands
| | - Anja Bieberle-Hütter
- Dutch Institute for Fundamental Energy Research (DIFFER), Electrochemical Materials and Interfaces (EMI), PO Box 6336, 5600 HH Eindhoven, The Netherlands
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