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198 results on '"Zhang, Liuting"'

25. Novel flame-retardant aluminum-based hydrolyzed material

Author

Li, Wenqing, primary, Yao, Zhendong, additional, Gu, Jing, additional, Cui, Yongfu, additional, Huang, Zengyang, additional, Tu, Guoping, additional, Liu, Min, additional, Li, Chao, additional, Chen, Miaogen, additional, Zheng, Jiaguang, additional, Zhang, Liuting, additional, and Fan, Meiqiang, additional

Published
2024
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32. Influence of Ti-Rich Secondary Phase on the Hydrogen Storage Performance of V-Based Hydrogen Storage Alloys

Author

Huang, Zhenguang, Yao, Zhendong, Cui, Yongfu, Chu, Yican, Liu, Min, Li, Chao, Zheng, Jiaguang, Zhang, Liuting, and Fan, Meiqiang

Abstract

Among V (vanadium)-based hydrogen storage alloys, high-V alloys show significant advantages and prospects. However, the small change of V content will have a great impact on the hydrogen storage performances, so it is of great significance to accurately optimize the V content. Herein, the structure and hydrogen storage properties of V75–XTi5+XCr20(x= 0, 5, 10) alloys were studied, and the underlying micromechanisms were revealed. It was observed that an increase in the Ti/V ratio leads to a rise in the content of the second phase enriched with Ti, yet even a small amount of the Ti-rich phase can significantly enhance activation performance. The hydrogen desorption plateau exhibits a decreasing trend with the increasing presence of the Ti-rich phase. The results indicate that the optimal comprehensive hydrogen storage performance is achieved when the V content is 70 atom %, exhibiting a suitable plateau pressure of 2.84 bar and a high hydrogen storage capacity of 2.40 wt % at 20 °C and 3.00 wt % at 200 °C. Furthermore, after 50 cycles, the capacity retention rate remains as high as 96.4 atom %. This performance establishes a solid foundation for future engineering applications of high-capacity hydrogen storage materials.

Published
2024
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33. How can low-carbon help high-quality urban development?—Empirical evidence from low-carbon city pilot policies.

Author

Fu, Dongping and Zhang, Liuting

Subjects
*CITIES & towns, *ECONOMIC development, *PANEL analysis, *TECHNOLOGICAL progress, *SOCIALIST societies
Abstract

High-quality development is the paramount task for comprehensively building a socialist modernized country. The low-carbon city pilot policy, with cities as the unit of action, provides new opportunities for high-quality economic transformation. Based on panel data from 261 cities between 2005 and 2018, this study calculates the level of high-quality economic development in Chinese cities, constructs a multi-period difference-in-differences model, analyzes the impact of the low-carbon city pilot policy on high-quality economic development, and explores the policy's heterogeneous effects on high-quality development in different types of cities and its transmission mechanism. The research findings show that the low-carbon city pilot policy can significantly promote high-quality economic development in cities and has heterogeneous effects in terms of regional differences, city types, and city scale. The effects are relatively greater in the eastern region, non-resource-based cities, and mega-cities. The low-carbon city pilot policy promotes high-quality economic development through mechanisms such as technological progress effects, resource agglomeration effects, and government action improvement effects. Combining theoretical analysis with empirical results, this study proposes policy recommendations to enhance the effectiveness of the low-carbon city pilot policy in promoting high-quality development. [ABSTRACT FROM AUTHOR]

Published
2024
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44. Interfacial engineering of nickel/vanadium based two-dimensional layered double hydroxide for solid-state hydrogen storage in MgH₂

Author

Gao, Dongqiang, Zhang, Liuting, Song, Mengchen, Wu, Fuying, Wang, Jiao, Zhao, Hu, Li, Hong, and School of Mechanical and Aerospace Engineering

Subjects
Hydrogen Storage, Mechanical engineering [Engineering], Catalysis
Abstract

As a high-density solid-state hydrogen storage material, magnesium hydride (MgH2) is promising for hydrogen transportation and storage. Yet, its stable thermodynamics and sluggish kinetics are unfavorable for that required for commercial application. Herein, nickel/vanadium trioxide (Ni/V2O3) nanoparticles with heterostructures were successfully prepared via hydrogenating the NiV-based two-dimensional layered double hydroxide (NiV-LDH). MgH2 + 7 wt% Ni/V2O3 presented more superior hydrogen absorption and desorption performances than pure MgH2 and MgH2 + 7 wt% NiV-LDH. The initial discharging temperature of MgH2 was significantly reduced to 190 °C after adding 7 wt% Ni/V2O3, which was 22 and 128 °C lower than that of 7 wt% NiV-LDH modified MgH2 and additive-free MgH2, respectively. The completely dehydrogenated MgH2 + 7 wt% Ni/V2O3 charged 5.25 wt% H2 in 20 min at 125 °C, while the hydrogen absorption capacity of pure MgH2 only amounted to 4.82 wt% H2 at a higher temperature of 200 °C for a longer time of 60 min. Moreover, compared with MgH2 + 7 wt% NiV-LDH, MgH2 + 7 wt% Ni/V2O3 shows better cycling performance. The microstructure analysis indicated the heterostructural Ni/V2O3 nanoparticles were uniformly distributed. Mg2Ni/Mg2NiH4 and metallic V were formed in-situ during cycling, which synergistically tuned the hydrogen storage process in MgH2. Our work presents a facile interfacial engineering method to enhance the catalytic activity by constructing a heterostructure, which may provide the mentality of designing efficient catalysts for hydrogen storage. The authors appreciatively acknowledge the financial supports from the National Natural Science Foundation of China (Grant No. 51801078).

Published
2023

48. Combined "Gateway" and "Spillover" effects originated from a CeNi5 alloy catalyst for hydrogen storage of MgH2.

Author

Song, Mengchen, Xie, Runkai, Zhang, Liuting, Wang, Xuan, Yao, Zhendong, Wei, Tao, and Shang, Danhong

Abstract

Efficient catalysts enable MgH2 with superior hydrogen storage performance. Herein, we successfully synthesized a catalyst composed of Ce and Ni (i.e. CeNi5 alloy) with splendid catalytic action for boosting the hydrogen storage property of magnesium hydride (MgH2). The MgH2—5wt%CeNi5 composite's initial hydrogen release temperature was reduced to 174°C and approximately 6.4wt% H2 was released at 275°C within 10 min. Besides, the dehydrogenation enthalpy of MgH2 was slightly decreased by adding CeNi5. For hydrogenation, the fully dehydrogenated sample absorbed 4.8wt% H2 at a low temperature of 175°C. The hydrogenation apparent activation energy was decreased from (73.60 ± 1.79) to (46.12 ± 7.33) kJ/mol. Microstructure analysis revealed that Mg2Ni/Mg2NiH4 and CeH2.73 were formed during the process of hydrogen absorption and desorption, exerted combined "Gateway" and "Spillover" effects to reduce the operating temperature and improve the hydrogen storage kinetics of MgH2. Our work provides an example of merging "Gateway" and "Spillover" effects in one catalyst and may shed light on designing novel highly-effective catalysts for MgH2 in near future. [ABSTRACT FROM AUTHOR]

Published
2023
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50. Unraveling the degradation mechanism for the hydrogen storage property of Fe nanocatalyst-modified MgH₂

Author

Song, Mengchen, Zhang, Liuting, Yao, Zhendong, Zheng, Jiaguang, Shang, Danhong, Chen, Lixin, Li, Hong, and School of Mechanical and Aerospace Engineering

Subjects
Capacity Retention, Mechanical engineering [Engineering], Activation Energy
Abstract

Maintaining fast hydrogen storage kinetics is a key challenge for the practical application of MgH2. To address this challenge, understanding the mechanism of kinetics that declines during cycling is crucial but it has not been systematically investigated to date. In this paper, three different Fe nanocatalysts were synthesized and then doped into MgH2 to form new composites. The MgH2-Fe composite had significantly reduced operating temperatures and activation energy compared to that of undoped MgH2. During cycling, a capacity retention of 93.4% was obtained after the 20th cycle. For a better understanding of the declining performance, prolonged incubation was intentionally performed. Grain growth was found in MgH2 and the Fe nanocatalysts, which was directly responsible for capacity loss and kinetic degradation. These findings provide fundamental insights to facilitate designing and preparing catalytic hydrogen storage systems with superior cycling performance. Submitted/Accepted version The authors appreciatively acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 51801078) and the Nature Science Foundation of Jiangsu Province (Grant No. BK202110884).

Published
2022

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