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Yousaf M, Lu Y, Hu E, Akbar M, Shah MAKY, Noor A, Akhtar MN, Mushtaq N, Yan S, Xia C, Zhu B. Interfacial Disordering and Heterojunction Enabling Fast Proton Conduction. SMALL METHODS 2023; 7:e2300450. [PMID: 37469012 DOI: 10.1002/smtd.202300450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 06/28/2023] [Indexed: 07/21/2023]
Abstract
The interfacial disorder is a general method to change the metal-oxygen compatibility and carrier density of heterostructure materials for ionic transport modulation. Herein, to enable high proton conduction, a semiconductor heterostructure based on spinel ZnFe2 O4 (ZFO) and fluorite CeO2 is developed and investigated in terms of structural characterization, first principle calculation, and electrochemical performance. Particular attention is paid to the interfacial disordering and heterojunction effects of the material. Results show that the heterostructure induces a disordered oxygen region at the hetero-interface of ZFO-CeO2 by dislocating oxygen atoms, leading to fast proton transport. As a result, the ZFO-CeO2 exhibits a high proton conductivity of 0.21 S cm-1 and promising fuel cell power output of 1070 mW cm-2 at 510 °C. Based upon these findings, a new mechanism is proposed by focusing on the change of O-O bond length to interpret the diffusion and acceleration of protons in ZFO-CeO2 on the basis of the Grotthuss mechanism. This study provides a new strategy to customize semiconductor heterostructure to enable fast proton conduction.
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Affiliation(s)
- Muhammad Yousaf
- Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, Nanjing, 210096, P. R. China
| | - Yuzheng Lu
- School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing, 211171, P. R. China
| | - Enyi Hu
- Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, Nanjing, 210096, P. R. China
| | - Muhammad Akbar
- School of Microelectronics, Hubei University, Wuhan, 430062, P. R. China
| | | | - Asma Noor
- Shenzhen Key Laboratory of Laser Engineering, Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Majid Niaz Akhtar
- Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan
| | - Naveed Mushtaq
- Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, Nanjing, 210096, P. R. China
| | - Senlin Yan
- School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing, 211171, P. R. China
| | - Chen Xia
- School of Microelectronics, Hubei University, Wuhan, 430062, P. R. China
- Hubei Yangtze Memory Laboratories, Wuhan, 430205, P. R. China
| | - Bin Zhu
- Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, Nanjing, 210096, P. R. China
- State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xian, 710049, P. R. China
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Recent advances in magnetic semiconductor ZnFe2O4 nanoceramics: History, properties, synthesis, characterization, and applications. J SOLID STATE CHEM 2023. [DOI: 10.1016/j.jssc.2023.123940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
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Husain M, Rahman N, Albalawi H, Ezzine S, Amami M, Zaman T, Rehman AU, Sohail M, Khan R, Khan AA, Tahir, Khan A. Examining computationally the structural, elastic, optical, and electronic properties of CaQCl 3 (Q = Li and K) chloroperovskites using DFT framework. RSC Adv 2022; 12:32338-32349. [PMID: 36425682 PMCID: PMC9650526 DOI: 10.1039/d2ra05602j] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 11/03/2022] [Indexed: 08/24/2023] Open
Abstract
This study presents the investigations of structural, elastic, optical, and electronic properties of CaQCl3 (Q = Li and K) chloroperovskites for the first time using the DFT framework. The WIEN2K and IRelast packages are used in which the exchange-correlation potential of the modified Becke-Johnson potential (TB-mBJ) is used for obtaining better results. The optimized crystal structural parameters comprising the lattice constant, optimum volume, ground state energy, bulk modulus, and the pressure derivative of bulk modulus are computed by fitting the primitive unit cell energy versus primitive unit cell volume using the Birch-Murnaghan equation of state. The elastic properties which consist of cubic elastic constants, Poisson's ratio, elastic moduli, anisotropy factor, and the Pugh ratio are computed using the very precise IRelast package incorporated inside WIEN2K. The electronic properties are analyzed from the computation of electronic bands structure and density of states (DOS), and it is concluded that an indirect band gap of 4.6 eV exists for CaLiCl3 and a direct band gap of 3.3 eV for CaKCl3 which confirms that CaLiCl3 is an insulator while CaKCl3 is a wide band gap semiconductor. The analysis of DOS shows that the greater contribution to the conduction band (CB) occurs because of the "Ca" element whereas in the valence band the major contribution is from the "Cl" element. The spectral curves of various parameters of optical properties from 0 eV up to 42 eV incident photon energies are observed and it is found that the CaQCl3 (Q = Li and K) chloroperovskites are optically active having a high absorption coefficient, optical conductivity, optical reflectivity, and energy loss function from 25 eV to 35 eV incident photon energies. The applications of these materials can be deemed to alter or control electromagnetic radiation in the ultraviolet (UV) spectral regions. In summary, the results for selected CaQCl3 (Q = Li and K) chloroperovskites depict that these are important compounds and can be used as scintillators, and energy storage devices, and in many modern electronic gadgets.
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Affiliation(s)
- Mudasser Husain
- Department of Physics, University of Lakki Marwat 28420 Lakki Marwat KPK Pakistan
| | - Nasir Rahman
- Department of Physics, University of Lakki Marwat 28420 Lakki Marwat KPK Pakistan
| | - Hind Albalawi
- Department of Physics, College of Sciences, Princess Nourah bint Abdulrahman University (PNU) P.O. Box 84428 Riyadh 11671 Saudi Arabia
| | - Safa Ezzine
- Department of Chemistry, College of Sciences, King Khalid University Abha Saudi Arabia
- Laboratoire des Matériaux et de L'Environnement Pour le Développement Durable LR18ES10 9 Avenue Dr. Zoheir Sai Tunis 1006 Tunisia
| | - Mongi Amami
- Department of Chemistry, College of Sciences, King Khalid University Abha Saudi Arabia
| | - Tahir Zaman
- Department of Mathematics, Government Post Graduate College Karak KPK Pakistan
| | - Altaf Ur Rehman
- Department of Physics, Riphah International University Lahore 54000 Pakistan
| | - Mohammad Sohail
- Department of Physics, University of Lakki Marwat 28420 Lakki Marwat KPK Pakistan
| | - Rajwali Khan
- Department of Physics, University of Lakki Marwat 28420 Lakki Marwat KPK Pakistan
| | - Abid Ali Khan
- Department of Chemical Sciences, University of Lakki Marwat 28420 Lakki Marwat KPK Pakistan
| | - Tahir
- Department of Physics, Pontifícia Universidade Católica do Rio de Janeiro Rua Marques de São Vicente 22451-900 Rio de Janeiro Brazil
| | - Aurangzeb Khan
- Department of Physics, Abdul Wali Khan University Mardan 23200 KPK Pakistan
- University of Lakki Marwat 28420 Lakki Marwat KPK Pakistan
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Barhoumi M, Sfina N. Electronic, Optical, and Elastic Properties of CaFI Monolayer and Acoustic Phonon Dispersion at Hypersonic Frequencies Using Density Functional Theory and beyond with Random Phase Approximation and Bethe-Salpeter Equation. ACS OMEGA 2022; 7:15338-15349. [PMID: 35571837 PMCID: PMC9096925 DOI: 10.1021/acsomega.1c06437] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 04/15/2022] [Indexed: 06/15/2023]
Abstract
The extraordinary properties of graphene have motivated us to investigate a novel 2D compound. In this framework, we study the structural, vibrational, electronic, optical, and elastic properties of a new two-dimensional CaFI monolayer, using DFT, GW, RPA, and BSE methodologies. The phonon dispersion curve of the CaFI monolayer exhibited no unstable phonon modes, confirming that this 2D sheet is dynamically stable. Our GW calculations show that the indirect bandgap energy value of CaFI is 6.52 eV. Interestingly, the bandgap rapidly decreased by improving the electric field value. Our BSE computations indicate that this monolayer becomes translucent when the incident light frequency exceeds the plasma frequency (6.50 eV). Also, we have computed the second and third elastic constants of CaFI by combining the DFT and RPA approaches with the homogeneous deformation method. Additionally, the longitudinal acoustic phonon dispersion of CaFI was studied. We have determined that the longitudinal acoustic wave velocity in our sheet is higher than the LA wave velocity of germanium measured using Brillouin or ultrasonic techniques.
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Affiliation(s)
- Mohamed Barhoumi
- Laboratoire
de la Matière Condensée et des Nanosciences (LMCN),
Université de Monastir, Département de Physique, Faculté des Sciences de Monastir, Avenue de l’Environnement, 5019 Monastir, Tunisia
| | - Noureddine Sfina
- Laboratoire
de la Matière Condensée et des Nanosciences (LMCN),
Université de Monastir, Département de Physique, Faculté des Sciences de Monastir, Avenue de l’Environnement, 5019 Monastir, Tunisia
- College
of Sciences and Arts in Mahayel Asir, Department of Physics, King Khalid University, 61421 Abha, Saudi
Arabia
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Effect of cation configuration and solvation on the band positions of zinc ferrite (100). Photochem Photobiol Sci 2022; 21:1091-1100. [PMID: 35355230 DOI: 10.1007/s43630-022-00201-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 03/03/2022] [Indexed: 10/18/2022]
Abstract
Zinc ferrite ZnFe[Formula: see text]O[Formula: see text] belongs to the spinel-type ferrites that have been proposed as photocatalysts for water splitting. The electronic band gap and the band edge positions are of utmost importance for the efficiency of the photocatalytic processes. We, therefore, calculated the absolute band energies of the most stable surface of ZnFe[Formula: see text]O[Formula: see text], the Zn-terminated (100) surface at self-consistent hybrid density functional theory level. The effect of Fe- and Zn-rich environments, cation exchange as antisite defects and implicit solvation on the band positions is investigated. Calculated flat band potentials of the pristine surface model ranges from [Formula: see text] to [Formula: see text] V against SHE in vacuum. For Zn-rich (Fe-rich) models this changes 0.3-0.9 (0.0-0.7) V against SHE. Fe-rich models are closest to the experimental range of reported flat band potentials. Solvent effects lower the calculated flat band potentials by up to 1.8 eV. The calculated band gaps range from 1.5 to 2.9 eV in agreement with previous theoretical work and experiment. Overall, our calculations confirm the experimentally observed low activity of ZnFe[Formula: see text]O[Formula: see text] and its dependence on preparation conditions.
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Prentice JCA, Mostofi AA. Accurate and Efficient Computation of Optical Absorption Spectra of Molecular Crystals: The Case of the Polymorphs of ROY. J Chem Theory Comput 2021; 17:5214-5224. [PMID: 34291954 DOI: 10.1021/acs.jctc.1c00227] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
When calculating the optical absorption spectra of molecular crystals from first principles, the influence of the crystalline environment on the excitations is of significant importance. For such systems, however, methods to describe the excitations accurately can be computationally prohibitive due to the relatively large system sizes involved. In this work, we demonstrate a method that allows optical absorption spectra to be computed both efficiently and at high accuracy. Our approach is based on the spectral warping method successfully applied to molecules in solvent. It involves calculating the absorption spectrum of a supercell of the full molecular crystal using semi-local time-dependent density functional theory (TDDFT), before warping the spectrum using a transformation derived from smaller-scale semi-local and hybrid TDDFT calculations on isolated dimers. We demonstrate the power of this method on three polymorphs of the well-known color polymorphic compound ROY and find that it outperforms both small-scale hybrid TDDFT dimer calculations and large-scale semi-local TDDFT supercell calculations, when compared to the experiment.
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Affiliation(s)
- Joseph C A Prentice
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.,Department of Materials, Department of Physics, and the Thomas Young Centre for Theory and Simulation of Materials, Imperial College London, London SW7 2AZ, U.K
| | - Arash A Mostofi
- Department of Materials, Department of Physics, and the Thomas Young Centre for Theory and Simulation of Materials, Imperial College London, London SW7 2AZ, U.K
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Bohra M, Alman V, Arras R. Nanostructured ZnFe 2O 4: An Exotic Energy Material. NANOMATERIALS 2021; 11:nano11051286. [PMID: 34068267 PMCID: PMC8153140 DOI: 10.3390/nano11051286] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 05/07/2021] [Accepted: 05/08/2021] [Indexed: 11/16/2022]
Abstract
More people, more cities; the energy demand increases in consequence and much of that will rely on next-generation smart materials. Zn-ferrites (ZnFe2O4) are nonconventional ceramic materials on account of their unique properties, such as chemical and thermal stability and the reduced toxicity of Zn over other metals. Furthermore, the remarkable cation inversion behavior in nanostructured ZnFe2O4 extensively cast-off in the high-density magnetic data storage, 5G mobile communication, energy storage devices like Li-ion batteries, supercapacitors, and water splitting for hydrogen production, among others. Here, we review how aforesaid properties can be easily tuned in various ZnFe2O4 nanostructures depending on the choice, amount, and oxidation state of metal ions, the specific features of cation arrangement in the crystal lattice and the processing route used for the fabrication.
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Affiliation(s)
- Murtaza Bohra
- Department of Physics, École Centrale School of Engineering (MEC), Mahindra University, Survey Number 62/1A, Bahadurpally Jeedimetla, Hyderabad 500043, India;
- Correspondence:
| | - Vidya Alman
- Department of Physics, École Centrale School of Engineering (MEC), Mahindra University, Survey Number 62/1A, Bahadurpally Jeedimetla, Hyderabad 500043, India;
| | - Rémi Arras
- Centre d’Elaboration de Matériaux et d’Etudes Structurales (CEMES), Université de Toulouse, CNRS, UPS, 29 rue Jeanne Marvig, F-31055 Toulouse, France;
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Ulpe AC, Bredow T. GW-BSE Calculations of Electronic Band Gap and Optical Spectrum of ZnFe 2 O 4 : Effect of Cation Distribution and Spin Configuration. Chemphyschem 2020; 21:546-551. [PMID: 31916657 PMCID: PMC7155046 DOI: 10.1002/cphc.201901088] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 01/08/2020] [Indexed: 11/28/2022]
Abstract
The G0W0, evGW0, evGW, and scGW0 approximations to many‐body perturbation theory combined with the Bethe‐Salpeter approach (BSE) are applied to calculate electronic and optical properties of the open‐shell spinel ferrite ZnFe2O4. The effect of the various degrees of self‐consistency is assessed by comparison to recent experimental results. Furthermore, the influence of the method for obtaining the ground‐state wavefunction is studied, including the GGA functional PBE with and without an intermediate step using the COHSEX approximation, as well as PBE+U, where we try to minimize the influence of the Hubbard potential U. Best agreement for the optical band gap and the first maxima of the excitation spectrum is obtained with the evGW method based on a PBE+U wavefunction. This method is chosen and converged carefully to yield quantitative results for the optical spectra of four different magnetic structures and cation distributions of ZnFe2O4. With the results we provide a possible explanation for inconsistency in experimental results.
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Affiliation(s)
- Anna C Ulpe
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie, Universität Bonn, Beringstraße 4-6, D-53115, Bonn, Germany
| | - Thomas Bredow
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie, Universität Bonn, Beringstraße 4-6, D-53115, Bonn, Germany
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