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21. Contributors

Author

Vázquez, Alejandro, primary, Yoshida, Akihiro, additional, Nuta, Alexandrina, additional, de Almeida, Alex F., additional, Singla, Alka, additional, Tangellapally, Amala, additional, Hassan, Amal I., additional, Mandal, Amit Kumar, additional, Sorescua, Ana-Alexandra, additional, Tellez, Ana de Monserrat Navarro, additional, Marwaha, Anupma, additional, Mikeladze, Archil, additional, Bayu, Asep, additional, Kharisov, Boris I., additional, Vaseeharana, Baskaralingam, additional, Amantes, Bruno de Paula, additional, de Paula, Carolina B.C., additional, González, Cesar Maximo Oliva, additional, Kuppam, Chandra Sekar, additional, Liu, Chia-Jyi, additional, Patra, Chitta Ranjan, additional, Freitas, Daniela de França da Silva, additional, Mariano, Danielle de Mattos, additional, Gventsadze, David, additional, Luévano-Hipólito, Edith, additional, Morales, Eder Moisés Cedeño, additional, de Paula-Elias, Fabrício C., additional, Amor, Gabriela, additional, Tavadze, George, additional, Albitres, Gerson Alberto Valencia, additional, Guan, Guoqing, additional, Dabhane, Harshal, additional, Murthy, H C Ananda, additional, Saleh, Hosam M., additional, Juárez-Ramírez, Isaías, additional, Contiero, Jonas, additional, Vidhya, Karunanithi, additional, Pagar, Khanderao, additional, Ahmad, Khursheed, additional, Jankowski, Krzysztof, additional, Torres-Martínez, Leticia Myriam, additional, Chkhartishvili, Levan, additional, Mendes, Luis Claudio, additional, Garay-Rodríguez, Luis F., additional, Yilmaz, M. Deniz, additional, Borowsk, Magdalena, additional, Saravanan, Manoharan, additional, Enamala, Manoj Kumar, additional, Tavares, Maria Inês Bruno, additional, Alfaro-Cruz, María Rocío, additional, Singh, Meenakshi, additional, Méndez-Rojas, Miguel Angel, additional, Ghobashy, Mohamed Mohamady, additional, Asif, Mohammad, additional, Imran, Mohd., additional, Khan, Mohd. Quasim, additional, Chavali, Murthy, additional, de Oliveira, Nayra M.L., additional, Menges, Nurettin, additional, Tsagareishvili, Otar, additional, Kharissova, Oxana V., additional, da Silva, Paulo Sergio Rangel Cruz, additional, Tambade, Pawan, additional, Oza, Rajeshwari, additional, Dixit, Rishibha, additional, Mondala, Rittick, additional, Iona, Rodica-Mariana, additional, Mishra, Roli, additional, Marwaha, Sanjay, additional, Mishra, Satyendra, additional, Pansambal, Shreyas, additional, Cestari, Sibele Piedade, additional, Das, Sourav, additional, Pamanji, Sudhakar Reddy, additional, Rani, Surekha, additional, Ghotekar, Suresh, additional, Quezada, Thelma Elizabeth Serrano, additional, Müller, Thomas Ernst, additional, Pagar, Trupti, additional, Medhane, Vijay, additional, Raza, Waseem, additional, Barot, Yash B, additional, and Kovziridze, Zviad, additional

Published
2021
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24. Fabrication of nanotubules of thermoelectric gamma-Na0.7CoO2 using porous aluminum oxide membrane as supporting template

Author

Liu, Chia-Jyi, Chen, Shu-Yo, and Shih, Long-Jiann

Subjects
Condensed Matter - Materials Science
Abstract

We report the successful synthesis of nanotubules of thermoelectric materials gamma-NaxCoO2 using two different sol-gel routes aided by porous anodized aluminium oxide (AAO) membrane as supporting templates. The gamma-NaxCoO2 nanotubule using urea-based route can be achieved at 650 degree C at a heating rate of 1 degree C/min and held for 4h. The gamma-NaxCoO2 nanotubule using citric acid-based route can be achieved at 500 degree C using a rapid-heat-up procedure and held for 30 min. The products were investigated using various techniques including XRD, SEM and TEM. Electron diffraction pattern taken along [001] zone axis direction on the nanotubule shows that all the diffraction spots can be indexed using a hexagonal unit cell with a = b = 0.56 nm, which can be considered as a superstructure with cell doubling within the ab plane., Comment: 7 pages, 8 figures

Published
2009

26. Superconductor made by electrolyzed and oxidized water

Author

Liu, Chia-Jyi, Wu, Tsung-Hsien, Hsu, Lin-Li, Wang, Jung-Sheng, Chen, Shu-Yo, Chang, Wei Jen, and Lin, Jiunn-Yuan

Subjects
Condensed Matter - Superconductivity
Abstract

By deintercalation of Na+ followed by inserting bilayers of water molecules into the host lattice, the layered cobalt oxide of gamma-Na0.7CoO2 undergoes a topotactic transformation to a layered cobalt oxyhydrate of Na0.35(H2O)1.3CoO2-delta with the c-axis expanded from c = 10.9 anstrom to c = 19.6 anstrom. In this paper, we demonstrate that the superconducting phase of c = 19.6 anstrom can be directly obtained by simply immersing gamma-Na0.7CoO2 powders in electrolyzed/oxidized (EO) water, which is readily available from a commercial electrolyzed water generator. We found that high oxidation-reduction potential of EO water drives the oxidation of the cobalt ions accompanying by the formation of the superconductive c = 19.6 anstrom phase. Our results demonstrate how EO water can be used to oxidize the cobalt ions and hence form superconducting cobalt oxyhydrates in a clean and simple way and may provide an economic and environment-friendly route to oxidize the transition metal of complex metal oxides, Comment: 10 pages, 4 figures

Published
2006

29. Phase formation and phase stability of KMnO4-treated (Na,K)CoO2.yH2O

Author

Liu, Chia-Jyi, Liao, C. -Y., Neeleshwar, S., Chen, Y. -Y., and Liu, Chia-Jung Charlie

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Materials Science
Abstract

We have first used the aquesous KMnO4 solutions to de-intercalate and oxideze gamma-phase of Na0.7CoO2 and successfully form the superconductive phase of cobalt oxyhydrate hydrates (Na,K)xCoO2.yH2O with Tc=3.2-4.6K based on the magnetization measurements. The higher molar ratio of KMnO4/Na used to treat Na0.7CoO2 results in more removal of Na+ and leads to a partial or even complete replacement of K+ for Na+. The low molar ratio of KMnO4/Na forms a superconductive phase with the c-axis ca. 19.6 angstrom, whereas the high molar ratio of KMnO4/Na forms a non-superconductive phase with teh c-axis ca. 13.9 angstrom. The superconductive 19.6 angstrom phase is unstable with respect to the ambient air in terms of losing water molecule from the structure; nevertheless, the dehydration/hydration process is reversible when storing the sample in a chamber with sufficient humidity., Comment: 7 pages, 10 figures

Published
2004

31. Aqueous-Solution Synthesized p-Type Cu2Se0.96Te0.04–xIx/Cu2O Composite and Thermoelectric Performance of TEG Made of 6 Pairs of p-Leg Cu2Se0.96Te0.02I0.02/Cu2O Composite and n-Leg InSb0.94Bi0.06

Author

Lourdhusamy, Vinothkumar, Paulraj, Immanuel, and Liu, Chia-Jyi

Abstract

Cu2Se-based thermoelectric materials exhibit high dimensionless figure of merit (zT) values at elevated temperatures (900–1000 K) but relatively lower zTvalues at intermediate temperatures, approximately 500 K. We synthesized a series of polycrystalline Cu2Se0.96Te0.04–xIx/Cu2O composites (where x= 0.00, 0.01, 0.02, and 0.03) using an energy-efficient synthesis method conducted at room temperature, followed by heat treatment at 923 K for 6 h. X-ray diffraction (XRD) analysis confirmed the monoclinic crystal structure of the α phase. The introduction of iodine doping at Te sites introduced electron carriers to p-type Cu2Se0.96Te0.04, reducing the hole carrier concentration. Consequently, the electrical resistivity increased, and the thermopower exhibited a significant increase. The incorporation of electron carriers into the p-type Cu2Se0.96Te0.04/Cu2O composites resulted in an enhanced power factor within the medium-temperature range. Specifically, at 500 K, the Cu2Se0.96Te0.02I0.02/Cu2O (x= 0.02) composites demonstrated the highest power factor among the series of Cu2Se0.96Te0.04–xIx/Cu2O composites, measuring 9.1 μW cm–1K–2. According to the weighted mobility analysis, it is clear that the x= 0.02 composite possesses the optimal carrier concentration, which accounts for its superior power factor compared to the other composites in the series. Furthermore, the Cu2Se0.96Te0.02I0.02/Cu2O composites and Cu2Se0.96Te0.04/Cu2O composites displayed zTvalues of 0.49 and 0.33, respectively, at 550 K. Additionally, iodine doping led to an enhancement in the average zTvalues between 450 and 550 K. Therefore, electron doping in p-type materials presents itself as a viable strategy for shifting the operating temperature of a thermoelectric device from high to medium temperature. We successfully fabricated a thermoelectric generator comprising 6 pairs of p-leg Cu2Se0.96Te0.02I0.02/Cu2O composites and n-leg InSb0.94Bi0.06. This TEG achieved impressive results, including a maximum output voltage, power output, power density, and efficiency of 0.115 V, 10.6 μW, 35.1 μW cm–2, and 1.74% at a temperature difference (ΔT) of 120 K.

Published
2024
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