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JournalISSN: 1995-8196

Transactions of Tianjin University 

Springer Science+Business Media
About: Transactions of Tianjin University is an academic journal published by Springer Science+Business Media. The journal publishes majorly in the area(s): Catalysis & Materials science. It has an ISSN identifier of 1995-8196. Over the lifetime, 1075 publications have been published receiving 5817 citations.


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Journal ArticleDOI
TL;DR: The properties of LIBs, including their operation mechanism, battery design and construction, and advantages and disadvantages, have been analyzed in detail to provide insight into the development of grid-level energy storage systems.
Abstract: In the electrical energy transformation process, the grid-level energy storage system plays an essential role in balancing power generation and utilization. Batteries have considerable potential for application to grid-level energy storage systems because of their rapid response, modularization, and flexible installation. Among several battery technologies, lithium-ion batteries (LIBs) exhibit high energy efficiency, long cycle life, and relatively high energy density. In this perspective, the properties of LIBs, including their operation mechanism, battery design and construction, and advantages and disadvantages, have been analyzed in detail. Moreover, the performance of LIBs applied to grid-level energy storage systems is analyzed in terms of the following grid services: (1) frequency regulation; (2) peak shifting; (3) integration with renewable energy sources; and (4) power management. In addition, the challenges encountered in the application of LIBs are discussed and possible research directions aimed at overcoming these challenges are proposed to provide insight into the development of grid-level energy storage systems.

223 citations

Journal ArticleDOI
TL;DR: In general, battery energy storage technologies are expected to meet the requirements of GLEES such as peak shaving and load leveling, voltage and frequency regulation, and emergency response, which are highlighted in this perspective.
Abstract: Grid-level large-scale electrical energy storage (GLEES) is an essential approach for balancing the supply–demand of electricity generation, distribution, and usage. Compared with conventional energy storage methods, battery technologies are desirable energy storage devices for GLEES due to their easy modularization, rapid response, flexible installation, and short construction cycles. In general, battery energy storage technologies are expected to meet the requirements of GLEES such as peak shaving and load leveling, voltage and frequency regulation, and emergency response, which are highlighted in this perspective. Furthermore, several types of battery technologies, including lead–acid, nickel–cadmium, nickel–metal hydride, sodium–sulfur, lithium-ion, and flow batteries, are discussed in detail for the application of GLEES. Moreover, some possible developing directions to facilitate efforts in this area are presented to establish a perspective on battery technology, provide a road map for guiding future studies, and promote the commercial application of batteries for GLEES.

119 citations

Journal ArticleDOI
TL;DR: In this article, the authors reviewed recent advances in the design strategies of supported metal catalysts for enhancing the activity of CO2 conversion and its selectivity to CO. This short review may provide insights into future reverse water gas shift (RWGS) catalyst designs and optimization.
Abstract: The catalytic conversion of CO2 to CO via a reverse water gas shift (RWGS) reaction followed by well-established synthesis gas conversion technologies may provide a potential approach to convert CO2 to valuable chemicals and fuels. However, this reaction is mildly endothermic and competed by a strongly exothermic CO2 methanation reaction at low temperatures. Therefore, the improvement in the low-temperature activities and selectivity of the RWGS reaction is a key challenge for catalyst designs. We reviewed recent advances in the design strategies of supported metal catalysts for enhancing the activity of CO2 conversion and its selectivity to CO. These strategies include varying support, tuning metal–support interactions, adding reducible transition metal oxide promoters, forming bimetallic alloys, adding alkali metals, and enveloping metal particles. These advances suggest that enhancing CO2 adsorption and facilitating CO desorption are key factors to enhance CO2 conversion and CO selectivity. This short review may provide insights into future RWGS catalyst designs and optimization.

87 citations

Journal ArticleDOI
TL;DR: In this article, a large scale composite bucket foundation (CBF) is proposed to deal with large vertical load, large horizontal load, and large bending moment in complex geological conditions.
Abstract: Based on mechanical characteristics such as large vertical load, large horizontal load, large bending moment and complex geological conditions, a large scale composite bucket foundation (CBF) is put forward. Both the theoretical analysis and numerical simulation are employed to study the bearing capacity of CBF and the relationship between loads and ground deformation. Furthermore, monopile, high-rise pile cap, tripod and CBF designs are compared to analyze the bearing capacity and ground deformation, with a 3-MW wind generator as an example. The results indicate that CBF can effectively bear horizontal load and large bending moment resulting from upper structures and environmental load.

64 citations

Journal ArticleDOI
TL;DR: In this article, the structural characteristics of a large-scale prestressing bucket foundation for offshore wind turbines are analyzed for 40-60 channels arranged with prestressing steel strand under the same ultimate load and boundary conditions.
Abstract: The key in the force transmission between the tower and the foundation for offshore wind turbines is to transfer the large moment and horizontal loads. The finite element model of a large-scale prestressing bucket foundation for offshore wind turbines is set up and the structural characteristics of the arc transition structure of the foundation are analyzed for 40–60 channels (20–30 rows) arranged with prestressing steel strand under the same ultimate load and boundary conditions. The mechanical characteristics of the key parts of the foundation structures are illustrated by the peak of the principal tensile stress, the peak of the principal compressive stress and the distribution areas where the principal tensile stress is larger than 2.00 MPa. It can be concluded that the maximum principal tensile stress of the arc transition decreases with the increasing number of channels, and the amplitude does not change significantly; the maximum principal compressive stress increases with the increasing number of channels and the amplitude changes significantly; however, for the distribution areas where the principal tensile stress is larger than 2.00 MPa, with different channel numbers, the phenomenon is not obvious. Furthermore, the principal tensile stress at the top of the foundation beams fluctuantly increases with the increasing number of channels and for the top cover of the bucket, the principal tensile stress decreases with the increasing number of channels.

64 citations

Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
20238
202247
202143
202043
201966
201863