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Two-dimensional covalent organic framework nanosheets:Synthesis and energy-related applications

Chinese Chemical Letters 2022年第6期33卷 2867-2882页

作者： Liangjun Chen Minchu Huang Bo Chen Chengtao Gong Nanjun Li Hongfei Cheng Ye Chen Yongwu Peng Guodong Xu College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Department of Chemistry City University of Hong KongHong KongChina Department of Chemistry The Chinese University of Hong KongHong KongChina School of Chemistry and Environmental Engineering Yancheng Teachers UniversityYancheng 224007China Institute of Materials Research and Engineering A'STAR(Agency for Science Technology and Research)Innovis 138634Singapore

Two-dimensional(2D)covalent organic framework nanosheets(CONs)are attracting increasing research attention because of their unique properties derived from their ultrathin thickness,high surface-tovolume atomic ratio,and extremely large surface area.2D CONs can provide high transport pathways for charge carriers(e.g.,electrons,holes and ions)through either the conjugated skeletons or the open channels.Therefore,they have shown great potential in energy related applications.In this review,we firstly introduce the recent developments and characteristics of 2D CONs by focusing on the two typical synthetic methods,i.e.,top-down and bottom-up methods.Then,the energy-related applications in energy storage and conversion of 2D CONs are summarized.Finally,we give our personal views on the challenges and perspectives for the future research of 2D CONs and their composites.

关键词： Covalent organic framework nanosheets top-down method Bottom-up method Batteries Photocatalysts Electrocatalysts

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Shanghai center project excavation induced ground surface movements and deformations

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Frontiers of Structural and Civil Engineering 2018年第1期12卷 26-43页

作者： Guolin XU Jiwen ZHANG Huang LIU Changqin REN Department of Civil Engineering Southwest Forestry University Kunming 650224 China Department of Civil Engineering University of Kentucky Lexington KY 40506-0281 USA Shanghai Geotechnical Investigations & Design Institute Company Limited Shanghai 200032 China

Empirical data on deep urban excavations can provide designers a significant reference basis for assessing potential deformations of the deep excavations and their impact on adjacent structures. The construction of the Shanghai Center involved excavations in excess of 33-m-deep using the top-down method at a site underlain by thick deposits of marine soft clay. A retaining system was achieved by 50-m-deep diaphragm walls with six levels of struts. During construction, a comprehensive instrumentation program lasting 14 months was conducted to monitor the behaviors of this deep circular excavation. The following main items related to ground surface movements and deformations were collected：（1） walls and circumferential soils lateral movements; （2） peripheral soil deflection in layers and ground settlements; and （3） pit basal heave. The results from the field instrumentation showed that deflections of the site were strictly controlled and had no large movements that might lead to damage to the stability of the foundation pit. The field performance of another 21 cylindrical excavations in top-down method were collected to compare with this case through statistical analysis. In addition, numerical analyses were conducted to compare with the observed data. The extensively monitored data are characterized and analyzed in this paper.

关键词： deep excavation foundation pit soft clay top-down method field observation ground surface movements,ground deformations

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