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Hsu KC, Keyan AK, Hung CW, Sakthinathan S, Yu CL, Chiu TW, Nagaraj K, Fan FY, Shan YK, Chen PC. Fabrication of CuYO 2 Nanofibers by Electrospinning and Applied to Hydrogen Harvest. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8957. [PMID: 36556762 PMCID: PMC9784510 DOI: 10.3390/ma15248957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/06/2022] [Accepted: 12/09/2022] [Indexed: 06/17/2023]
Abstract
Hydrogen can be employed as an alternative renewable energy source in response to climate change, global warming, and the energy problem. Methanol gas steam reforming (SRM) is the major method used in industry to produce hydrogen. In the SRM process, the catalyst nature offers benefits such as low cost, simplicity, and quickness. In this work, delafossite copper yttrium oxide (CuYO2) nanofibers were successfully prepared by electrospinning. The prepared CuYO2 nanofibers have different physical and chemical properties including thermoelectric behavior. The electrospinning method was used to produce as-spun fibers and annealed in an air atmosphere to form Cu2Y2O5 fibers; then, Cu2Y2O5 fibers were annealed in a nitrogen atmosphere to form CuYO2 nanofibers. X-ray diffraction studies and thermogravimetric and transmission electron microscope analysis confirmed the formation of CuYO2 nanofibers. The CuYO2 nanofibers were applied to methanol steam reforming for hydrogen production to confirm their catalytic ability. The CuYO2 nanofibers exhibited high catalytic activity and the best hydrogen production rate of 1967.89 mL min-1 g-cat-1 at 500 °C. The highly specific surface area of CuYO2 nanofibers used in steam reforming reactions could have significant economic and industrial implications. The performance of these CuYO2 nanofibers in hydrogen generation could be very important in industries with a global economic impact. Furthermore, the H2 production performance increases at higher reaction temperatures.
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Affiliation(s)
- Kai-Chun Hsu
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, No. 1, Section 3, Zhongxiao E. Rd., Taipei 106, Taiwan
- Institute of Materials Science and Engineering, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan
| | - Arjunan Karthi Keyan
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, No. 1, Section 3, Zhongxiao E. Rd., Taipei 106, Taiwan
- Institute of Materials Science and Engineering, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan
| | - Chin-Wei Hung
- School of Dental Technology, Taipei Medical University, 250, Wu-Hsing Street, Taipei 110, Taiwan
| | - Subramanian Sakthinathan
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, No. 1, Section 3, Zhongxiao E. Rd., Taipei 106, Taiwan
- Institute of Materials Science and Engineering, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan
| | - Chung-Lun Yu
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, No. 1, Section 3, Zhongxiao E. Rd., Taipei 106, Taiwan
- Institute of Materials Science and Engineering, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan
| | - Te-Wei Chiu
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, No. 1, Section 3, Zhongxiao E. Rd., Taipei 106, Taiwan
- Institute of Materials Science and Engineering, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan
| | - Karuppiah Nagaraj
- SRICT-Institute of Science and Research, UPL University of Sustainable Technology, Block No. 402, Ankleshwar-Valia, Rd., Vataria, Ankleshwar 393135, Gujarat, India
| | - Fang-Yu Fan
- School of Dental Technology, Taipei Medical University, 250, Wu-Hsing Street, Taipei 110, Taiwan
| | - Yung-Kang Shan
- School of Dental Technology, Taipei Medical University, 250, Wu-Hsing Street, Taipei 110, Taiwan
| | - Po-Chou Chen
- E-Current Co., Ltd., 10F.-5, No. 50, Sec. 4, Nanjing E. Rd., Songshan Dist., Taipei 10553, Taiwan
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Alhalaili B, Popescu IN, Kamoun O, Alzubi F, Alawadhia S, Vidu R. Nanobiosensors for the Detection of Novel Coronavirus 2019-nCoV and Other Pandemic/Epidemic Respiratory Viruses: A Review. SENSORS (BASEL, SWITZERLAND) 2020; 20:E6591. [PMID: 33218097 PMCID: PMC7698809 DOI: 10.3390/s20226591] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/10/2020] [Accepted: 11/11/2020] [Indexed: 02/08/2023]
Abstract
The coronavirus disease 2019 (COVID-19) pandemic is considered a public health emergency of international concern. The 2019 novel coronavirus (2019-nCoV) or severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that caused this pandemic has spread rapidly to over 200 countries, and has drastically affected public health and the economies of states at unprecedented levels. In this context, efforts around the world are focusing on solving this problem in several directions of research, by: (i) exploring the origin and evolution of the phylogeny of the SARS-CoV-2 viral genome; (ii) developing nanobiosensors that could be highly effective in detecting the new coronavirus; (iii) finding effective treatments for COVID-19; and (iv) working on vaccine development. In this paper, an overview of the progress made in the development of nanobiosensors for the detection of human coronaviruses (SARS-CoV, SARS-CoV-2, and Middle East respiratory syndrome coronavirus (MERS-CoV) is presented, along with specific techniques for modifying the surface of nanobiosensors. The newest detection methods of the influenza virus responsible for acute respiratory syndrome were compared with conventional methods, highlighting the newest trends in diagnostics, applications, and challenges of SARS-CoV-2 (COVID-19 causative virus) nanobiosensors.
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Affiliation(s)
- Badriyah Alhalaili
- Nanotechnology and Advanced Materials Program, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat 13109, Kuwait; (B.A.); (F.A.); (S.A.)
| | - Ileana Nicoleta Popescu
- Faculty of Materials Engineering and Mechanics, Valahia University of Targoviste, 13 Aleea Sinaia Street, 130004 Targoviste, Romania
| | - Olfa Kamoun
- Physics of Semiconductor Devices Unit, Faculty of Sciences of Tunis, Tunis El Manar University, Tunis 1068, Tunisia;
| | - Feras Alzubi
- Nanotechnology and Advanced Materials Program, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat 13109, Kuwait; (B.A.); (F.A.); (S.A.)
| | - Sami Alawadhia
- Nanotechnology and Advanced Materials Program, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat 13109, Kuwait; (B.A.); (F.A.); (S.A.)
| | - Ruxandra Vidu
- Faculty of Materials Science and Engineering, University Politehnica of Bucharest, 060042 Bucharest, Romania
- Department of Electrical and Computer Engineering, University of California Davis, Davis, CA 95616, USA
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Abstract
ABO2 delafossites are fascinating materials that exhibit a wide range of physical properties, including giant Rashba spin splitting and anomalous Hall effects, because of their characteristic layered structures composed of noble metal A and strongly correlated BO2 sublayers. However, thin film synthesis is known to be extremely challenging owing to their low symmetry rhombohedral structures, which limit the selection of substrates for thin film epitaxy. Hexagonal lattices, such as those provided by Al2O3(0001) and (111) oriented cubic perovskites, are promising candidates for epitaxy of delafossites. However, the formation of twin domains and impurity phases is hard to suppress, and the nucleation and growth mechanisms thereon have not been studied for the growth of epitaxial delafossites. In this study, we report the epitaxial stabilization of a new interfacial phase formed during pulsed-laser epitaxy of (0001)-oriented CuCrO2 epitaxial thin films on Al2O3 substrates. Through a combined study using scanning transmission electron microscopy/electron-energy loss spectroscopy and density functional theory calculations, we report that the nucleation of a thermodynamically stable, atomically thick CuCr1-xAlxO2 interfacial layer is the critical element for the epitaxy of CuCrO2 delafossites on Al2O3 substrates. This finding provides key insights into the thermodynamic mechanism for the nucleation of intermixing-induced buffer layers that can be used for the growth of other noble-metal-based delafossites, which are known to be challenging due to the difficulty in initial nucleation.
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Electrodeposition of Bi-Te Thin Films on Silicon Wafer and Micro-Column Arrays on Microporous Glass Template. NANOMATERIALS 2020; 10:nano10030431. [PMID: 32121270 PMCID: PMC7152996 DOI: 10.3390/nano10030431] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 02/20/2020] [Accepted: 02/26/2020] [Indexed: 11/17/2022]
Abstract
Electrodeposition is an important method for preparing bismuth telluride (Bi2Te3)-based thermoelectric (TE) thin films and micro-column arrays. When the concentrations of Bi:Te in electrolytes were 3 mM:4 mM, the TE films satisfied the Bi2Te3 stoichiometry and had no dependence on deposition potential. With increasing over-potential, crystal grains changed from lamellar structures with uniform growth directions to large clusters with staggered dendrites, causing a decrease in the deposition density. Meanwhile, the preferred (110) orientation was diminished. The TE film deposited at −35 mV had an optimum conductivity of 2003.6 S/cm and a power factor of 2015.64 μW/mK2 at room temperature due to the (110)-preferred orientation. The electrodeposition of TE micro-columns in the template was recently used to fabricate high-power micro-thermoelectric generators (micro-TEG). Here, microporous glass templates were excellent templates for micro-TEG fabrication because of their low thermal conductivity, high insulation, and easy processing. A three-step pulsed-voltage deposition method was used for the fabrication of micro-columns with large aspect ratios, high filling rates, and high density. The resistance of a single TE micro-column with a 60 μm diameter and a 200 μm height was 6.22 Ω. This work laid the foundation for micro-TEG fabrication and improved performance.
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Abstract
The high-pressure behaviour of LiCrO2, a compound isostructural to the battery compound LiCoO2, has been investigated by synchrotron-based angle-dispersive X-ray powder diffraction, Raman spectroscopy, and resistance measurements up to 41, 30, and 10 Gpa, respectively. The stability of the layered structured compound on a triangular lattice with R-3m space group is confirmed in all three measurements up to the highest pressure reached. The dependence of lattice parameters and unit-cell volume with pressure has been determined from the structural refinements of X-ray diffraction patterns that are used to extract the axial compressibilities and bulk modulus by means of Birch–Murnaghan equation-of-state fits. The pressure coefficients for the two Raman-active modes, A1g and Eg, and their mode-Grüneisen parameters are reported. The electrical resistance measurements indicate that pressure has little influence in the resistivity up to 10 GPa. The obtained results for the vibrational and structural properties of LiCrO2 under pressure are in line with the published results of the similar studies on the related compounds. Research work reported in this article contributes significantly to enhance the understanding on the structural and mechanical properties of LiCrO2 and related lithium compounds.
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Tuning the electrical properties of the p-type transparent conducting oxide Cu 1-xCr 1+xO 2 by controlled annealing. Sci Rep 2018; 8:7216. [PMID: 29740118 PMCID: PMC5940695 DOI: 10.1038/s41598-018-25659-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 04/18/2018] [Indexed: 11/27/2022] Open
Abstract
Off-stoichiometric copper chromium oxide delafossite received lately a great interest due to its high p-type electrical conductivity and adequate optical transmittance in the visible range. However, for a suitable integration in active devices such as p-n junctions, transistors or optoelectronic devices, the electronic properties must be efficiently tailored. Here, post-deposition thermal treatment is proven as an adequate approach for finely controlling the electrical properties of this former degenerate semiconducting material. The energetics of the annealing process are investigated using two different approaches, as a function of the annealing temperature and as a function of the annealing time, allowing the accurate determination of the activation energy of the annealing of defects. By using this method, the electrical carrier concentration was varied in the 1021 – 1017 cm−3 range while the recorded changes in the drift mobility covered three orders of magnitude. Moreover, we demonstrate the ability to accurately manipulate the Fermi level of such materials, which is of great importance in controlling the carrier injection and extraction in optoelectronic active layers.
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Sinnarasa I, Thimont Y, Presmanes L, Barnabé A, Tailhades P. Correction: Sinnarasa, Inthuga, et al. Thermoelectric and Transport Properties of Delafossite CuCrO₂:Mg Thin Films Prepared by RF Magnetron Sputtering. Nanomaterials 2017, 7, 157. NANOMATERIALS 2017; 7:nano7110357. [PMID: 29084146 PMCID: PMC5707574 DOI: 10.3390/nano7110357] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 10/30/2017] [Accepted: 10/30/2017] [Indexed: 11/16/2022]
Affiliation(s)
- Inthuga Sinnarasa
- CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, F-31062 Toulouse CEDEX 9, France.
| | - Yohann Thimont
- CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, F-31062 Toulouse CEDEX 9, France.
| | - Lionel Presmanes
- CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, F-31062 Toulouse CEDEX 9, France.
| | - Antoine Barnabé
- CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, F-31062 Toulouse CEDEX 9, France.
| | - Philippe Tailhades
- CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, F-31062 Toulouse CEDEX 9, France.
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