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220 results on '"Dai Yunqian"'

11. List of contributors

Author

AlAhzm, Abdulrahman Mohmmed, primary, Alejli, Maan Omar, additional, AlMaadeed, Fatima Zayed, additional, Al-Maadeed, Mariam Al Ali, additional, Almetwally, Alsiad Ahmed, additional, Bagherzadeh, Roohollah, additional, Campanella, Daniele, additional, Chase, George G., additional, Clemens, Frank, additional, Costamagna, Paola, additional, Dai, Yunqian, additional, Elkahlout, Zainab Ibrahim, additional, El-Samak, Ali A., additional, Evans, Edward A., additional, Gager, Elizabeth J., additional, Gan, Yong X., additional, Hassan, Mohammad K., additional, Holtappels, Peter, additional, Isaac, Blesson, additional, Jose, Rajan, additional, Kang, Chin-Shuo, additional, Kim, Hyoun Woo, additional, Kim, Sang Sub, additional, Kotlarz, Parker L., additional, Ksapabutr, Bussarin, additional, Kumar, Raj, additional, La Monaca, Andrea, additional, Li, Zhihui, additional, Ling, JinKiong, additional, Liu, Suting, additional, Lu, Xiaofeng, additional, Majhi, Sanjit Manohar, additional, Mirzaei, Ali, additional, Mondal, Kunal, additional, Nino, Juan C., additional, Panapoy, Manop, additional, Paolella, Andrea, additional, Pawar, Gorakh, additional, Ponnamma, Deepalekshmi, additional, Rahman, Hammadur, additional, Sanna, Caterina, additional, Saveh Shemshaki, Nikoo, additional, Sebastian, Tutu, additional, Sun, Yueming, additional, Tang, Mingyu, additional, Tian, Di, additional, Vasisth, Shangradhanva E., additional, Wang, Ce, additional, Wang, Zhao, additional, Xue, Jiajia, additional, Zaidi, Syed Javaid, additional, Zhang, Liqun, additional, and Zhang, Xiaodi, additional

Published
2022
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12. Special techniques and advanced structures

Author

Tang, Mingyu, primary, Liu, Suting, additional, Li, Zhihui, additional, Zhang, Xiaodi, additional, Wang, Zhao, additional, Dai, Yunqian, additional, Sun, Yueming, additional, Zhang, Liqun, additional, and Xue, Jiajia, additional

Published
2022
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13. Engineering Asymmetric Strain within C-Shaped CeO2Nanofibers for Stabilizing Sub-3 nm Pt Clusters against Sintering

Author

Fu, Wanlin, Yu, Ying, Yin, Kuibo, Li, Zhihui, Tang, Mingyu, Tian, Jilan, Wei, Guanzhao, Zhou, Shiming, Sun, Yueming, and Dai, Yunqian

Abstract

Ultrafine noble metals have emerged as advanced nanocatalysts in modern society but still suffer from unavoidable sintering at temperatures above 250 °C (e.g., Pt). In this work, closely packed CeO2grains were confined elegantly in fibrous nanostructures and served as a porous support for stabilizing sub-3 nm Pt clusters. Through precisely manipulating the asymmetry of obtained nanofibers, uneven strain was induced within C-shaped CeO2nanofibers with tensile strain at the outer side and compressive strain at the inner side. As a result, the enriched oxygen vacancies significantly improved adhesion of Pt to CeO2, thereby boosting the sinter-resistance of ultraclose sub-3 nm Pt clusters. Notably, no aggregation was observed even after exposure to humid air at 750 °C for 12 h, which is far beyond their Tammann temperature (sintering onset temperature, below 250 °C). In situHAADF-STEM observation revealed a unique sintering mechanism, wherein Pt clusters initially migrate toward the grain boundaries with concentrated stain and undergo slight coalescence, followed by subsequent Ostwald ripening at higher temperatures. Moreover, the sinter-resistant Pt/C-shaped CeO2effectively catalyzed soot combustion (over 700 °C) in a durable manner. This work provides a new insight for developing sinter-resistant catalysts from the perspective of strain engineering within nano-oxides.

Published
2024
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23. Coupling of Hierarchical Al2O3/TiO2Nanofibers into 3D Photothermal Aerogels Toward Simultaneous Water Evaporation and Purification

Author

Meng, Xiangyu, Xu, Wanlin, Li, Zhihui, Yang, Jianhui, Zhao, Jingwu, Zou, Xixi, Sun, Yueming, and Dai, Yunqian

Abstract

Serious freshwater shortage and environmental pollution boost the rapid development of solar-driven water production. Although improved evaporation rate has achieved in recent years, undesirable impurity (e.g., pollutant components) can also be inevitably evaporated and collected as impurity in produced freshwater. This work reports new ultra-light three-dimensional (3D) aerogels assembled by hierarchical Al2O3/TiO2nanofibers and reduced graphene oxide (RGO) for exciting synchronized solar-driven evaporation and water purification. Hydrophilic Al2O3/TiO2fibrous channels linked up the graphene hot-spots and water body for sufficient water supply and bulk water insulation. Meanwhile, featured with thermal insulation effect, the Al2O3/TiO2nanofibers effectively locked the converted heat with less energy loss from sunlight. The introducing of Al2O3/TiO2nanofibers into RGO aerogel led to the effective interfacial evaporation for a more rapid water evaporation rate (2.19 kg · m−2· h−1, normalized to evaporation area including both top and side surface), which was 36% higher than that of pristine RGO aerogel. Moreover, simultaneous with the strong steam generation, Al2O3/TiO2nanofibers in situ removed the pollutants within steam by photodegradation, achieving polluted wastewater purification with high contaminant removal ratio of 91.3%. Our work on coupling Al2O3/TiO2nanofibers into photothermal aerogel provides attractive solutions for the challenges of clean water scarcity and serious environmental pollution.

Published
2024
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29. List of contributors

Author

K. Anjali, S. Aswani, M. Bhavisha, Avani Chunduri, N.P. Dileep, Suraj Gupta, P.R. Jyothi, Sunaja Devi K.R., Marjeta Maček Kržmanc, Manju Kurian, C.S. Chitra Lekha, Krishnakumar Melethil, Swapna S. Nair, Nainesh Patel, Dephan Pinheiro, Sruthi Rajasekaran, B. Shalini Reghunath, A. Sakthivel, M.M. Shaijumon, Matjaž Spreitzer, Mingyu Tang, Smitha Thankachan, Bejoy Thomas, Ying Yu, and Dai Yunqian

Published
2023

35. MXene-decorated flexible Al2O3/TiO2 nanofibrous mats with self-adaptive stress dispersion towards multifunctional desalination.

Author

Wang, Yunpeng, Xu, Wanlin, Zou, Xixi, Fu, Wanlin, Meng, Xiangyu, Jiang, Jingyi, Zheng, Yiqun, Ramakrishna, Seeram, Sun, Yueming, and Dai, Yunqian

Abstract

Solar-driven interfacial evaporation has shown great promise for desalination due to its high photothermal conversion efficiency. However, for interfacial evaporation, the evaporator must have superior mechanical quality and strong thermal stability. To this end, ceramic nanofibrous mats with good mechanical strength can serve as a stable substrate for desalination. Herein, with the aid of finite element analysis, flexible Al2O3/TiO2 nanofibrous mats with robust mechanical properties are fabricated, where the stress dispersion greatly facilitates the Al2O3/TiO2 nanospheres to be uniformly dispersed into the mat. The flexible nanofibrous mats exhibit a high tensile strength up to 2.18 MPa. Afterward, a two-dimensional (2D) Al2O3/TiO2/MXene mat is constructed by a simple drop-casting method. Interestingly, the evaporation rate of the Al2O3/TiO2/MXene-2 mat reached 1.43 kg m−2 h−1, and the light-to-vapor energy conversion efficiency can reach 102% at a power density of 1.0 kW m−2. To measure the desalination efficiency, five ion concentrations in the collected water were found to be well below the safe salinity levels defined by standards set by the World Health Organization and U.S Environmental Protection Agency. Utilizing basic origami technology, the three-dimensional (3D) photothermal evaporator was integrated with the 2D mat due to its flexibility and ductility. Additionally, the evaporation rate increased to 1.61 kg m−2 h−1. This study is critical in the design of composite ceramic nanofiber materials with high flexibility and photothermal conversion efficiency for multifunctional desalination. [ABSTRACT FROM AUTHOR]

Published
2023
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36. Aligning Fe2O3 photo-sheets on TiO2 nanofibers with hydrophilic and aerophobic surface for boosting photoelectrochemical performance.

Author

Meng, Xiangyu, Zhan, Qi, Wu, Yanan, Zhu, Mengmeng, Liu, Ken, Wang, Na, Yin, Kuibo, Sun, Yueming, Dong, Shuai, and Dai, Yunqian

Subjects
NANOSTRUCTURED materials, PHOTOELECTROCHEMICAL cells, DENSITY functional theory, NANOFIBERS, HETEROSTRUCTURES
Abstract

Photoelectrochemical (PEC) nanomaterials are critical to producing clean oxygenation or value-added chemical production by utilizing sustainable solar energy, but are always limited by simultaneous integration of architectural engineering and electronic regulation in one structure. Directed by density functional theory (DFT) calculations and finite element analysis (FEA), the bio-inspired ivy-like Fe2O3 heterostructures with enriched oxygen defects on TiO2 nanofibers are designed for boosting PEC performances. Ivy-like Fe2O3 photo-sheets remarkably enhanced the light harvesting by multiple light-mater interactions. The oxygen vacancies on Fe2O3 photo-sheets could aid the photons catching and promote the reactivity at active sites. More importantly, demonstrated by a well-designed dynamic observation, the abundant tip-edges within ivy-like Fe2O3 photo-sheets enabled the surface of heterostructure with hydrophilic and aerophobic properties. The functionalized surface allowed the rapid desorption of produced bubbles and thus ensured a high density of unoccupied active sites for electrolyte accessing. Featured by these attributes, the Fe2O3@TiO2 nanofibers delivered an excellent photocurrent of 40.8 mA/mg, high donor density (1.2 × 1018 cm−3), and rapid oxygen production rate (1 mmol/(L·h)). This work demonstrates a new strategy on nano-structural design for enhancing light-harvesting and making a hydrophilic/aerophobic surface on low-dimensional oxide nanomaterial, holding great potential on designing high-performance PEC devices for producing survival source gas, carbon-neutral fuel, and valued-chemicals. [ABSTRACT FROM AUTHOR]

Published
2023
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