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150 results on '"ZHANG Guoling"'

42. Transient Multi-Physics Modeling and Performance Degradation Evaluation of Direct Internal Reforming Solid Oxide Fuel Cell Focusing on Carbon Deposition Effect.

Author

Li, Zheng, Yang, Guogang, Shen, Qiuwan, Li, Shian, Wang, Hao, Liao, Jiadong, Jiang, Ziheng, and Zhang, Guoling

Subjects
SOLID oxide fuel cells, POROUS electrodes, THERMODYNAMIC equilibrium
Abstract

The performance degradation issue caused by carbon deposition has limited the commercial application of natural-gas-fueled solid oxide fuel cells. Most previous corresponding studies are based on thermodynamic equilibrium analyses, while long-term transient evaluation work is lacking. Therefore, a transient multi-physics numerical model is developed in present work. The corresponding long-term performance degradation evaluation is then conducted. The results show that, for a direct internal reforming solid oxide fuel cell, the increase in carbon deposition and deterioration of performance degradation were concentrated in the first 180 days of steady−state operation and slowed down at the later stage. The electrode inlet rapidly developed a high concentration of carbon deposition after 180 days of steady−state operation. The deposited carbon deteriorated the gas transport and decayed reaction activity within the porous electrode, eventually inducing a deactivation zone with 0 current density at the inlet. Key measures to inhibit carbon deposition should be implemented within the first 180 days of operation, and the pre-reformed operation of natural gas is encouraged for natural-gas-fueled solid oxide fuel cells. [ABSTRACT FROM AUTHOR]

Published
2023
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44. BiOBr Precursor Solutions Modified Cement Paste: The Photocatalytic Performance and Effects

Author

Wang Jin, Dan Wang, Zhang Guoling, Cheng Xin, Yu Yanfeng, Lina Zhang, and Zhi Geng

Subjects
Cement, cement, Curing (food preservation), Materials science, Crystallography, Scanning electron microscope, General Chemical Engineering, microstructure, Condensed Matter Physics, Microstructure, Hydrothermal circulation, BiOBr, Inorganic Chemistry, Compressive strength, RhB degradation and NOx removal, Chemical engineering, QD901-999, Photocatalysis, General Materials Science, Dispersion (chemistry), photocatalysis
Abstract

The potential of photocatalysts modified cement-based materials in degrading environmental pollutants is evident in previous studies, but the application of photocatalytic cement-based materials still appears limited in actual practice due to the dispersion effect. This work seeks to prepare photocatalytic cement paste by mixing cement with BiOBr precursor solutions in terms of the improvement of dispersion efficiency, and additional hydrothermal conditions provided by autoclaved curing period are required to activate the photocatalytic activity of photocatalysts crystals. The presence of BiOBr precursor solutions results in an increase of RhB degradation rate of up to 45.4% and the NOx removal efficiency was up to 4.4%, and the formation of BiOBr photocatalysts crystals is the main reason for photocatalytic performance enhancement. The morphology of photocatalysts and the pore size distribution of cement paste also contribute to the photocatalytic activity enhancement by the exposed surface of photocatalysts, which are supported by the analyses of Scanning Electron Microscope and Mercury Intrusion Porosimetry results. A new mechanism is suggested to explain the synergistic role of crystals and microstructure on the enhancement of photocatalytic activity with the extension of autoclaved curing time. As supports for photocatalysts, the development changes of compressive strength of cement paste are also discussed.

Published
2021

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