1
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Sahoo RC, Sahoo P, Mohanta MK, Jena P, Matte HSSR. Solution Processing of Spinel Nickel Cobaltite: Exfoliation Mechanism, Dispersion Stability, and Applications. Inorg Chem 2024; 63:7838-7847. [PMID: 38635967 DOI: 10.1021/acs.inorgchem.4c00430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
The exfoliation of nonlayered materials to mono- or few-layers is of growing interest to realize their full potential for various applications. Nickel cobaltite (NiCo2O4), which has a spinel crystal structure, is one such nonlayered material with unique properties and has been utilized in a wide range of applications. Herein, NiCo2O4 is synthesized from NiCo2- Layered double hydroxides using a topochemical conversion technique. Subsequently, bulk NiCo2O4 is exfoliated into mono- or few-layer nickel cobaltene nanosheets using liquid-phase exfoliation in various low-boiling point solvents. An analytical centrifuge technique is also utilized to understand the solute-solvent interactions by determining their dispersion stability using parameters such as the instability index and sedimentation velocity. Among the studied solvents, water/isopropyl alcohol cosolvent is found to have better dispersion stability. In addition, density functional theory calculations are carried out to understand the exfoliation mechanism. It is found that the surface termination arising from the Co-O bond needs the least energy for exfoliation. Furthermore, the obtained nickel cobaltene nanosheets are utilized as an active material for supercapacitors without any conductive additives or binders. A solid-state symmetric supercapacitor delivers a specific capacitance of 10.2 mF cm-2 with robust stability, retaining ∼98% capacitance after 4000 cycles.
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Affiliation(s)
- Ramesh Chandra Sahoo
- Energy Materials Laboratory, Centre for Nano and Soft Matter Sciences, Bangalore 562162, India
- Manipal Academy of Higher Education (MAHE), Manipal 576104, India
| | - Priyabrata Sahoo
- Energy Materials Laboratory, Centre for Nano and Soft Matter Sciences, Bangalore 562162, India
- Manipal Academy of Higher Education (MAHE), Manipal 576104, India
| | - Manish Kumar Mohanta
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Puru Jena
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - H S S Ramakrishna Matte
- Energy Materials Laboratory, Centre for Nano and Soft Matter Sciences, Bangalore 562162, India
- Manipal Academy of Higher Education (MAHE), Manipal 576104, India
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2
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Stavrou M, Chazapis N, Georgakilas V, Couris S. 2D Non-van der Waals Nanoplatelets of Hematene and Magnetene: Nonlinear Optical Response and Optical Limiting Performance from UV to NIR. Chemistry 2023; 29:e202301959. [PMID: 37589720 DOI: 10.1002/chem.202301959] [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: 06/20/2023] [Revised: 08/17/2023] [Accepted: 08/17/2023] [Indexed: 08/18/2023]
Abstract
Recently, the preparation of some hematene and magnetene ultrathin non van der Waals (non-vdW) 2D nanoplatelets was reported starting from hematite and magnetite natural iron ores. The present work reports on the determination and evaluation of the nonlinear optical response and the optical limiting (OL) action of these 2D nanoplatelets dispersed in water under ns laser excitation. The obtained results show that both hematene and magnetene exhibit strong nonlinear absorption and refraction, comparable and even larger than those of other van der Waals (vdW) 2D counterpart materials. In addition, due to their strong nonlinear absorption, both hematene and magnetene show exceptional OL performance from the UV to visible, attaining very low values of optical limiting onset (OLon ), comparable and even lower than that of vdW 2D nanomaterials, such as graphene, graphene oxide, other transition metal dichalcogenides like MoS2 , WS2 and MoSe2 , black phosphorous and antimonene. Moreover, hematene was found to exhibit more efficient OL action than magnetene for all the excitation wavelengths studied, attributed to more efficient ligand to metal charge transfer. The present findings open new possibilities for the potential use of these non-vdW 2D materials in photonics and optoelectronics, e. g., as optical limiters and optical switchers.
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Affiliation(s)
- Michalis Stavrou
- Department of Physics, University of Patras University Campus, 26504, Rion, Achaia, Greece
- Institute of Chemical Engineering Sciences (ICE-HT), Foundation for Research and Technology-Hellas (FORTH) Stadiou St, Platani, 26504, Patras, Greece
| | - Nikolaos Chazapis
- Department of Physics, University of Patras University Campus, 26504, Rion, Achaia, Greece
- Institute of Chemical Engineering Sciences (ICE-HT), Foundation for Research and Technology-Hellas (FORTH) Stadiou St, Platani, 26504, Patras, Greece
| | - Vasilios Georgakilas
- Department of Materials Science, University of Patras University Campus, 26504, Rion, Achaia, Greece
| | - Stelios Couris
- Department of Physics, University of Patras University Campus, 26504, Rion, Achaia, Greece
- Institute of Chemical Engineering Sciences (ICE-HT), Foundation for Research and Technology-Hellas (FORTH) Stadiou St, Platani, 26504, Patras, Greece
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Lee M, Kim T, Jang W, Lee S, So JP, Jang G, Choi S, Kim S, Bae J, Kim T, Park HG, Moon J, Soon A, Shim W. Nontypical Wulff-Shape Silicon Nanosheets with High Catalytic Activity. J Am Chem Soc 2023; 145:22620-22632. [PMID: 37799086 DOI: 10.1021/jacs.3c07768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
Nanostructured silicon with an equilibrium shape has exhibited hydrogen evolution reaction activity mainly owing to its high surface area, which is distinct from that of bulk silicon. Such a Wulff shape of silicon favors low-surface-energy planes, resulting in silicon being an anisotropic and predictably faceted solid in which certain planes are favored, but this limits further improvement of the catalytic activity. Here, we introduce nanoporous silicon nanosheets that possess high-surface-energy crystal planes, leading to an unconventional Wulff shape that bolsters the catalytic activity. The high-index plane, uncommonly seen in the Wulff shape of bulk Si, has a band structure optimally aligned with the redox potential necessary for hydrogen generation, resulting in an apparent quantum yield (AQY) of 12.1% at a 400 nm wavelength. The enhanced light absorption in nanoporous silicon nanosheets also contributes to the high photocatalytic activity. Collectively, the strategy of making crystals with nontypical Wulff shapes can provide a route toward various classes of photocatalysts for hydrogen production.
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Affiliation(s)
- Minwoo Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
- Center for Multi-Dimensional Materials, Yonsei University, Seoul 03722, Republic of Korea
| | - Taehoon Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
- Center for Multi-Dimensional Materials, Yonsei University, Seoul 03722, Republic of Korea
| | - Woosun Jang
- Integrated Science and Engineering Division, Underwood International College, Yonsei University, Incheon 21983, Republic of Korea
| | - Sangseob Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Jae-Pil So
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
- Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, Republic of Korea
| | - Gyumin Jang
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Sangjin Choi
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
- Center for Multi-Dimensional Materials, Yonsei University, Seoul 03722, Republic of Korea
| | - Sungsoon Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
- Center for Multi-Dimensional Materials, Yonsei University, Seoul 03722, Republic of Korea
| | - Jihong Bae
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
- Center for Multi-Dimensional Materials, Yonsei University, Seoul 03722, Republic of Korea
| | - Taeyoung Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
- Center for Multi-Dimensional Materials, Yonsei University, Seoul 03722, Republic of Korea
| | - Hong-Gyu Park
- Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, Republic of Korea
| | - Jooho Moon
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Aloysius Soon
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Wooyoung Shim
- Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
- Center for Multi-Dimensional Materials, Yonsei University, Seoul 03722, Republic of Korea
- Center for Nanomedicine, Institute for Basic Science (IBS), Seoul 03722, Republic of Korea
- Yonsei IBS Institute, Yonsei University, Seoul 08826, Republic of Korea
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Putwa S, Curtis IS, Dasog M. Nanostructured silicon photocatalysts for solar-driven fuel production. iScience 2023; 26:106317. [PMID: 36950113 PMCID: PMC10025979 DOI: 10.1016/j.isci.2023.106317] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023] Open
Abstract
Solar-driven production of fuels such as hydrogen, hydrocarbons, and ammonia using semiconducting photocatalysts has the potential to be a sustainable alternative to current chemical processes. In recent years, silicon (Si) nanostructures have been recognized as a promising photocatalyst for hydrogen generation and organic oxidation reactions owing to its abundance, biocompatibility, and cost. While bulk Si has been studied extensively, on the nanoscale, plenty of opportunities exist to understand and engineer optimally performing Si photocatalysts. This perspective will highlight key results on the use of Si nanostructures for photocatalytic H2 production, CO2 reduction via light and heat-driven chemical looping, and current challenges in utilizing it for fuel-forming reactions. A brief guide on how these challenges can be addressed in the future and other unexplored questions that remain in the field are also discussed.
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Affiliation(s)
- Sarrah Putwa
- Department of Chemistry, Dalhousie University, Halifax, NS, Canada
| | - Isabel S. Curtis
- Department of Chemistry, Dalhousie University, Halifax, NS, Canada
| | - Mita Dasog
- Department of Chemistry, Dalhousie University, Halifax, NS, Canada
- Corresponding author
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Sierra L, Gibaja C, Torres I, Salagre E, Avilés Moreno JR, Michel EG, Ocón P, Zamora F. Alpha-Germanium Nanolayers for High-Performance Li-ion Batteries. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3760. [PMID: 36364534 PMCID: PMC9655185 DOI: 10.3390/nano12213760] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 10/20/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
The exfoliation of tridimensional crystal structures has recently been considered a new source of bidimensional materials. The new approach offers the possibility of dramatically enlarging the library of bidimensional materials, but the number of nanolayers produced so far is still limited. Here, we report for the first time the use of a new type of material, α-germanium nanolayers (2D α-Ge). The 2D α-Ge is obtained by exfoliating crystals of α-germanium in a simple one-step procedure assisted by wet ball-milling (gram-scale fabrication). The α-germanium nanolayers have been tested as anode material for high-performance LIBs. The results show excellent performance in semi-cell configuration with a high specific capacity of 1630 mAh g-1 for mass loading of 1 mg cm-2 at 0.1 C. The semi-cell was characterized by a constant current rate of 0.5 C during 400 cycles and different scan rates (0.1 C, 0.5 C, and 1 C). Interestingly, the structural characterization, including Raman spectroscopy, XRPD, and XPS, concludes that 2D α-Ge largely retains its crystallinity after continuous cycling. These results can be used to potentially apply these novel 2D germanium nanolayers to high-performance Li-ion batteries.
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Affiliation(s)
- Laura Sierra
- Departamento de Química Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Carlos Gibaja
- Departamento de Química Inorgánica, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Iñigo Torres
- Departamento de Química Inorgánica, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Elena Salagre
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | | | - Enrique G. Michel
- Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Pilar Ocón
- Departamento de Química Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Félix Zamora
- Departamento de Química Inorgánica, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain
- IMDEA-Nanociencia, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
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6
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Kaur H, Coleman JN. Liquid-Phase Exfoliation of Nonlayered Non-Van-Der-Waals Crystals into Nanoplatelets. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2202164. [PMID: 35470487 DOI: 10.1002/adma.202202164] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 04/07/2022] [Indexed: 05/28/2023]
Abstract
For nearly 15 years, researchers have been using liquid-phase exfoliation (LPE) to produce 2D nanosheets from layered crystals. This has yielded multiple 2D materials in a solution-processable form whose utility has been demonstrated in multiple applications. It was believed that the exfoliation of such materials is enabled by the very large bonding anisotropy of layered materials where the strength of intralayer chemical bonds is very much larger than that of interlayer van der Waals bonds. However, over the last five years, a number of papers have raised questions about our understanding of exfoliation by describing the LPE of nonlayered materials. These results are extremely surprising because, as no van der Waals gap is present to provide an easily cleaved direction, the exfoliation of such compounds requires the breaking of only chemical bonds. Here the progress in this unexpected new research area is examined. The structure and properties of nanoplatelets produced by LPE of nonlayered materials are reviewed. A number of unexplained trends are found, not least the preponderance of isotropic materials that have been exfoliated to give high-aspect-ratio nanoplatelets. Finally, the applications potential of this new class of 2D materials are considered.
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Affiliation(s)
- Harneet Kaur
- School of Physics, CRANN & AMBER Research Centres, Trinity College Dublin, Dublin, D02 PN40, Ireland
| | - Jonathan N Coleman
- School of Physics, CRANN & AMBER Research Centres, Trinity College Dublin, Dublin, D02 PN40, Ireland
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Parvin S, Hazra V, Francis AG, Pati SK, Bhattacharyya S. In Situ Cation Intercalation in the Interlayer of Tungsten Sulfide with Overlaying Layered Double Hydroxide in a 2D Heterostructure for Facile Electrochemical Redox Activity. Inorg Chem 2021; 60:6911-6921. [PMID: 33667066 DOI: 10.1021/acs.inorgchem.1c00011] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The role of electrochemical interfaces in energy conversion and storage is unprecedented and more so the interlayers of two-dimensional (2D) heterostructures, where the physicochemical nature of these interlayers can be adjusted by cation intercalation. We demonstrate in situ intercalation of Ni2+ and Co2+ with similar ionic radii of ∼0.07 nm in the interlayer of 1T-WS2 while electrodepositing NiCo layered double hydroxide (NiCo-LDH) to create a 2D heterostructure. The extent of intercalation varies with the electrodeposition time. Electrodeposition for 90 s results in 22.4-nm-thick heterostructures, and charge transfer ensues from NiCo-LDH to 1T-WS2, which stabilizes the higher oxidation states of Ni and Co. Density functional theory calculations validate the intercalation principle where the intercalated Ni and Co d electrons contribute to the density of states at the Fermi level of 1T-WS2. Water electrolysis is taken as a representative redox process. The 90 s electrodeposited heterostructure needs the relatively lowest overpotentials of 134 ± 14 and 343 ± 4 mV for hydrogen and oxygen evolution reactions, respectively, to achieve a current density of ±10 mA/cm2 along with exceptional durability for 60 h in 1 M potassium hydroxide. The electrochemical parameters are found to correlate with enhanced mass diffusion through the cation and Cl--intercalated interlayer spacing of 1T-WS2 and the number of active sites. While 1T-WS2 is mostly celebrated as a HER catalyst in an acidic medium, with the help of intercalation chemistry, this work explores an unfound territory of this transition-metal dichalcogenide to catalyze both half-reactions of water electrolysis.
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Affiliation(s)
- Sahanaz Parvin
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, India
| | - Vishwadeepa Hazra
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, India
| | - Anita Gemmy Francis
- Theoretical Sciences Unit, School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Swapan K Pati
- Theoretical Sciences Unit, School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
| | - Sayan Bhattacharyya
- Department of Chemical Sciences and Centre for Advanced Functional Materials, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, India
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8
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Ott S, Lakmann M, Backes C. Impact of Pretreatment of the Bulk Starting Material on the Efficiency of Liquid Phase Exfoliation of WS 2. NANOMATERIALS 2021; 11:nano11051072. [PMID: 33921953 PMCID: PMC8143503 DOI: 10.3390/nano11051072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/15/2021] [Accepted: 04/16/2021] [Indexed: 12/16/2022]
Abstract
Liquid phase exfoliation (LPE) is widely used to produce colloidal dispersions of nanomaterials, in particular two-dimensional nanosheets. The degree of exfoliation, i.e., the length to thickness aspect ratio was shown to be intrinsically limited by the ratio of in-plane to out-of-plane binding strength. In this work, we investigate whether simple pretreatment of the starting material can be used to change the in-plane to out-of-plane binding strength through mild intercalation to improve the sample quality in sonication-assisted LPE. Five different pretreatment conditions of WS2 were tested and the dispersions size-selected through centrifugation. From optical spectroscopy (extinction, Raman, photoluminescence), information on nanosheet dimension (average lateral size, layer number, monolayer size) and optical quality (relative photoluminescence quantum yield) was extracted. We find that the pretreatment has a minor impact on the length/thickness aspect ratio, but that photoluminescence quantum yield can be increased in particular using mild sonication conditions. We attribute this to the successful exfoliation of nanosheets with a lower degree of basal plane defectiveness. This work emphasizes the complexity of the exfoliation process and suggests that the role of defects has to be considered for a comprehensive picture.
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