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Rawat A, Clark L, Zhang C, Cavin J, Sangwan VK, Toth PS, Janáky C, Ananth R, Goldfine E, Bedzyk MJ, Weiss EA, Rondinelli JM, Hersam MC, Meletis EI, Rajeshwar K. Solution Combustion Synthesis and Characterization of Magnesium Copper Vanadates. Inorg Chem 2023; 62:8903-8913. [PMID: 37260199 PMCID: PMC10266371 DOI: 10.1021/acs.inorgchem.3c00452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Indexed: 06/02/2023]
Abstract
Magnesium vanadate (MgV2O6) and its alloys with copper vanadate were synthesized via the solution combustion technique. Phase purity and solid solution formation were confirmed by a variety of experimental techniques, supported by electronic structure simulations based on density functional theory (DFT). Powder X-ray diffraction combined with Rietveld refinement, laser Raman spectroscopy, diffuse reflectance spectroscopy, and high-resolution transmission electron microscopy showed single-phase alloy formation despite the MgV2O6 and CuV2O6 end members exhibiting monoclinic and triclinic crystal systems, respectively. DFT-calculated optical band gaps showed close agreement in the computed optical bandgaps with experimentally derived values. Surface photovoltage spectroscopy, ambient-pressure photoemission spectroscopy, and Kelvin probe contact potential difference (work function) measurements confirmed a systematic variation in the optical bandgap modification and band alignment as a function of stoichiometry in the alloy composition. These data indicated n-type semiconductor behavior for all the samples which was confirmed by photoelectrochemical measurements.
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Affiliation(s)
- Abhishek Rawat
- Department
of Chemistry & Biochemistry, The University
of Texas at Arlington, Arlington, Texas 76019, United States
| | - Laura Clark
- Department
of Mechanical and Aerospace Engineering, The University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Chuzhong Zhang
- Department
of Materials Science and Engineering, The
University of Texas at Arlington, Arlington, Texas 76019, United States
| | - John Cavin
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - Vinod K. Sangwan
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - Peter S. Toth
- Department
of Physical Chemistry and Materials Science, University of Szeged, Rerrich Square 1, Szeged H-6720, Hungary
| | - Csaba Janáky
- Department
of Physical Chemistry and Materials Science, University of Szeged, Rerrich Square 1, Szeged H-6720, Hungary
| | - Riddhi Ananth
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - Elise Goldfine
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - Michael J. Bedzyk
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - Emily A. Weiss
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - James M. Rondinelli
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - Mark C. Hersam
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - Efstathios I. Meletis
- Department
of Materials Science and Engineering, The
University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Krishnan Rajeshwar
- Department
of Chemistry & Biochemistry, The University
of Texas at Arlington, Arlington, Texas 76019, United States
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Sakata T, Yoshiyuki R, Okada R, Urushidani S, Tarutani N, Katagiri K, Inumaru K, Koyama K, Masubuchi Y. Environmentally Benign Synthesis and Color Tuning of Strontium-Tantalum Perovskite Oxynitride and Its Solid Solutions. Inorg Chem 2021; 60:4852-4859. [PMID: 33631931 DOI: 10.1021/acs.inorgchem.0c03758] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A facile method was successfully developed to prepare strontium-tantalum perovskite oxynitride, SrTaO2N, and its solid solutions. Urea was employed as a solid nitriding agent to eliminate the use of toxic NH3 gas. In addition, utilization of sol-gel-derived Ta2O5 gel as a Ta precursor allowed for completion of nitridation within a shorter period and at a lower calcination temperature compared with the conventional ammonolysis process. Optimization of the reaction conditions, such as the urea content, allowed for the production of solid solutions of SrTaO2N and Sr1.4Ta0.6O2.9. The products exhibited optical absorption and chromatic colors because of the narrower band gaps of oxynitrides compared with those of oxides. The O/N ratios of the solid solutions were easily adjusted by varying the amount of urea in the mixture of precursors. As a result, the colors of the products ranged from yellow to brown. The nitridation process and products developed in this study are interesting environmentally benign alternatives to conventional inorganic pigments.
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Affiliation(s)
- Takuya Sakata
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan.,Western Region Industrial Research Center, Hiroshima Prefectural Technology Research Institute, 2-10-1 Aga-Minami, Kure 737-0004, Japan
| | - Risa Yoshiyuki
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Ryoki Okada
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Sohta Urushidani
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Naoki Tarutani
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Kiyofumi Katagiri
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Kei Inumaru
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
| | - Kyohei Koyama
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, N13 W8, Kita-ku, Sapporo 060-8628, Japan
| | - Yuji Masubuchi
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, N13 W8, Kita-ku, Sapporo 060-8628, Japan
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DFG priority program SPP 1613 “ Fuels Produced Regeneratively Through Light-Driven Water Splitting”. Z PHYS CHEM 2020. [DOI: 10.1515/zpch-2000-1067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Kaiser B, Frotscher L, Jaegermann W. DFG priority program SPP 1613 “ Fuels Produced Regeneratively Through Light-Driven Water Splitting”. Z PHYS CHEM 2020. [DOI: 10.1515/zpch-3000-1067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- B. Kaiser
- Institute for Materials Science , Technical University Darmstadt , 64287 Darmstadt , Germany
| | - L. Frotscher
- Institute for Materials Science , Technical University Darmstadt , 64287 Darmstadt , Germany
| | - W. Jaegermann
- Institute for Materials Science , Technical University Darmstadt , 64287 Darmstadt , Germany
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