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37 results on '"Yang, Yihai"'

12. Enhanced Electro‐Optical and Heat Regulation of Intelligent Dimming Films Using the Photovoltaic Effect of p–n Heterostructures.

Author

Zhang, Zuowei, Yang, Yihai, Ma, Cong, Yu, Meina, Xu, Jianjun, Chen, Chao, Yuan, Baohua, Zou, Cheng, Gao, Yanzi, Wang, Qian, and Yang, Huai

Subjects
*HETEROSTRUCTURES, *POLYMER structure, *COOLING, *PHOTOVOLTAIC effect, *ELECTROCHROMIC windows, *THRESHOLD voltage, *X-ray diffraction
Abstract

In this paper, the effect of p–n heterostructures on the electro‐optical and heat regulation performances of polymer dispersed liquid crystal (PDLC) dimming films are studied. In detail, the WO3, Ag2O, and WO3/Ag2O p–n heterostructures are successfully synthesized via the co‐precipitation method. The products are analyzed by XRD, SEM, TEM, and XPS and the results demonstrated that the WO3 nanorods successfully grew on the surface of Ag2O. Compared to the primitive sample, the incorporation of p–n heterostructures into the composite films significantly enhances the electro‐optical properties. For a 20µm‐thick film, the saturation voltage (Vsat) decreases by 38.7% from 24.8 to 15.2 V, and the threshold voltage (Vth) is reduced by 22.9% from 12.7 to 9.8 V, while the contrast ratio reaches 132. Due to the molecular structure of the polymer monomers and the micro‐network structure of the film, the film exhibits high emissivity in the mid infrared spectrum, enabling enhanced dynamic cooling management through radiative cooling around the clock. Matrix & laboratory (MATLAB) calculations show that the maximum cooling power during the day and night reached 97.63 and 136.24W m‐2 K‐1, respectively. This research has great significance for the development of highly energy‐efficient smart windows. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Research progress of green scale inhibitors: a mini review.

Author

Xu, Jianqi, Jing, Guolin, Liu, Tie, Liu, Yang, Yanheng, Liang, and Yang, Yihai

Subjects
PLANT extracts, EUTROPHICATION, OIL fields
Abstract

Oilfield scale is one of the major flow assurance issues today in the oil field. The use of scale inhibitor is an effective approach to control scale deposition. Among them, scale inhibitors containing phosphorus have the best achievement. However, many phosphorus-based inhibitors participate in the eutrophication process as nutrients. Due to this environmental problem, green scale inhibitors have been used to prevent the formation of scale. This paper summarized the synthesis of the most widely researched green scale inhibitors in recent years, such as polyaspartic acid (PASP), polyepoxysuccinic acid (PESA), plant extracts and their derivatives, as well as other new inhibitors. Moreover, this paper reviews their mechanism and the progress of application research in recent years. [ABSTRACT FROM AUTHOR]

Published
2022
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35. Application of Metal-organic Framework Materials (MOFs) in thePhotocatalytic CO2 Reduction: A Mini-Review

Author

Liu, Yuanyuan, Jing, Guolin, Zhang, Huibo, Liu, Yang, Yang, Yihai, and Xu, Jianqi

Abstract

In recent years, the effective use of CO2 has become one of the research hotspots worldwide to solve environmental pollution and energy shortage, whose excessive emission led to increasingly serious global environmental problems. Metal-organic frameworks (MOFs), with extraordinary specific surface areas, tunable surface chemistry, fast electron migration rate, large CO2 adsorption capacity, etc． are a new class of functional materials composed of metal ions/clusters and organic ligands, which have broad application potential in CO2 photocatalytic reduction. This paper systematically generalized the composition of the structure, discussed the methods of synthetics and expounded the photocatalytic properties and photocatalytic mechanism of MOFs. In addition, the application and research progress of MOFs functional materials in recent research are reviewed. The article also summarized challenges and prospects for the large-scale photocatalytic applications of MOFs catalysts. It guides the preparation of novel modified MOFs photocatalysts for high-efficiency applications in the field of CO2 reduction and photocatalytic degradation of dyes.

Published
2021
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