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Planning Method and Coordinated Operation Strategy for Multi-station Integration System

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2394-2408页

作者： Ankang Miao Yue Yuan Han WU Junpeng Zhu the College of Energy and Electrical Engineering Hohai UniversityNanjing 211100China

A multi-station integration system(MSIS)integrat-ing other multi-type stations provides a new way to realize an intensive development of resources and promote low-carbon en-ergy and its high-efficiency utilization.To this end,a novel multi-station integration planning method and coordinated operation strategy model for the MSIS are established in a new business model.In this study,a new business model of the MSIS,with substations as the carrier,integrating distributed photovoltaic,energy storage,electric vehicle charging,data center,and 5G base stations is proposed.From the social environment,natural conditions,and complementary characteristics,a comprehensive index system is established to analyze expansion capability of substations and multi-station combination scheme.Scenario reduction is performed by extracting feature vectors and build-ing a comprehensive evaluation function to select the optimal combination scheme under a specific scenario.Moreover,for the combination scheme in a specific scenario,the optimal ca-pacity configuration and coordinated operation strategy chance-constrained programming model of the MSIS are established under different operating conditions.Finally,simulations are performed on a practical MSIS located in wuxi,China,and simulation results demonstrate the rationality and effectiveness of the planning method and coordinated operation strategy model for the MSIS.

关键词： Business model comprehensive index system coordinated operation strategy multi-station combination scheme multi-station integration system planning method

Assessment Model for Distributed Wind Generation Hosting Capacity Considering Complex Spatial Correlations

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Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1194-1206页

作者： Han WU Yue Yuan Junpeng Zhu Yundai Xu IEEE Nanjing Institute of Technology Nanjing 211167China College of Energy and Electrical Engineering Hohai UniversityNanjing 211100China

To facilitate the large-scale integration of distributed wind generation(DWG), the uncertainty of DWG outputs needs to be quantified, and the maximum DWG hosting capacity(DWGHC) of distribution systems must be assessed. However, the structure of the high-dimensional nonlinear dependencies and the abnormal marginal distributions observed in geographically dispersed DWG outputs lead to the increase of the complexity of the uncertainty analysis. To address this issue,this paper proposes a novel assessment model for DWGHC that considers the spatial correlations between distributed generation(DG) outputs. In our method, an advanced dependence modeling approach called vine copula is applied to capture the high-dimensional correlation between geographically dispersed DWG outputs and generate a sufficient number of correlated scenarios. To avoid an overly conservative hosting capacity in some extreme scenarios, a novel chance-constrained assessment model for DWGHC is developed to determine the optimal sizes and locations of DWG for a given DWG curtailment probability. To handle the computational challenges associated with large-scale scenarios, a bilinear variant of Benders decomposition(BD) is employed to solve the chance-constrained problem.The effectiveness of the proposed method is demonstrated using a typical 38-bus distribution system in eastern China.

关键词： Correlation Benders decomposition(BD) distributed wind generation(DWG) hosting capacity vine copula

The Novel Variable Stiffness Composite Systems with Characteristics of Repeatable High Load Bearing and Response Rate

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Journal of Bionic Engineering 2023年第2期20卷 495-505页

作者： Zhiwei Tuo Zhaohua Lin Qian Zhao Yunhong Liang Han WU Chang Liu Zhiwu han The Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun130025China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun130022China

On the base of controllable variable stiffness property,variable stiffness composites were the main components of functional materials in aerospace.However,the relatively low mechanical strength,stiffness range,and response rate restricted the application of variable stiffness composite.In this work,the novel variable stiffness composite system with characteristics of repeatable high load bearing and response rate was successfully prepared via the double-layer anisotropic structure to solve the bottlenecks of variable stiffness composites.The novel variable stiffness composite systems were composed of variable stiffness layer of polycaprolactone(PCL)and the driven layer of silicone elastomer with alcohol,which continuously changed Young’s modulus from 0.1 to 7.263 MPa(72.63 times variation)in 200 s and maintained maximum weight of 11.52 times its own weight(8.5 g).Attributed to the relatively high variable stiffness range and load bearing value of variable stiffness composite system,the repeatable response process led to the efficient high load driven as“muscle”and diversified precise grab of objects with different shapes as“gripper”,owning widespread application prospects in the field of bionics.

关键词： Variable stiffness composite High strength Repeatable High load bearing Bionic

Three-dimensional (3D) scaffolds as powerful weapons for tumor immunotherapy

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Bioactive Materials 2022年第11期7卷 300-319页

作者： Shuyan han Jun wu School of Biomedical Engineering Sun Yat-sen UniversityShenzhen518057China

Though increasing understanding and remarkable clinical successes have been made, enormous challenges remain to be solved in the field of cancer immunotherapy. In this context, biomaterial-based immunomodulatory strategies are being developed to boost antitumor immunity. For the local immunotherapy, macroscale bioma-terial scaffolds with 3D network structures show great superiority in the following aspects: facilitating the encapsulation, localized delivery, and controlled release of immunotherapeutic agents and even immunocytes for more efficient immunomodulation. The concentrating immunomodulation in situ could minimize systemic tox-icities, but still exert abscopal effects to harness the power of overall anticancer immune response for eradicating malignancy. To promote such promising immunotherapies, the design requirements of macroscale 3D scaffolds should comprehensively consider their physicochemical and biological properties, such as porosity, stiffness, surface modification, cargo release kinetics, biocompatibility, biodegradability, and delivery modes. To date, increasing studies have focused on the relationships between these parameters and the biosystems which will guide/assist the 3D biomaterial scaffolds to achieve the desired immunotherapeutic outcomes. In this review, by highlighting some recent achievements, we summarized the latest advances in the development of various 3D scaffolds as niches for cancer immunotherapy. We also discussed opportunities, challenges, current trends, and future perspectives in 3D macroscale biomaterial scaffold-assisted local treatment strategies. More importantly, this review put more efforts to illustrate how the 3D biomaterial systems affect to modulate antitumor immune activities, where we discussed how significant the roles and behaviours of 3D macroscale scaffolds towards in situ cancer immunotherapy in order to direct the design of 3D immunotherapeutic.

关键词： Three-dimensional(3D) Macroscale Hydrogels Scaffolds Cancer immunotherapy

Facile autoreduction synthesis of core-shell Bi-Bi2O3/CNT with 3-dimensional neural network structure for high-rate performance supercapacitor

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Journal of Materials Science & Technology 2020年第12期47卷 169-176页

作者： Han WU Jingdong Guo De'an Yang Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin University300072China

Core-shell Bi-Bi2 O3/CNT(carbon nanotube) with 3-dimensional neural network structure where Bi-Bi2O3 nanospheres act as cell bodies supported by a 3-dimensional network of CNTs acting as synapses is designed and prepared by simple solvothermal method and subsequent annealing autoreduction treatment,and this structure facilitates the efficient transport of electrons.It can provide two electron transfer paths due to the double contact of Bi2O3 shell with CNT and metal Bi core which enhances the efficiency of the electrochemical reaction.The Bi-Bi2 O3/CNT electrode shows a high gravimetric capacitance of 850 F g-1(1 A g-1),and the specific capacitance of Bi-Bi2O3/CNT can be still 714 F g-1 at 30 A g-1 indicating excellent rate performance.The asymmetric supercapacitor is assembled with Bi-Bi2 O3/CNT as the negative electrode and Ni(OH)2/CNT as the positive electrode,delivering a high energy density of 36.7 Wh kg-1 and a maximum power density of 8000 W kg-1.Therefore,the core-shell Bi-Bi2O3/CNT with 3-dimensional neural network structure as the negative electrode of supercapacitor shows great potential in the field of energy storage in the future.

关键词： Electrochemical energy-storage Asymmetric supercapacitor 3-Dimensional neural network structure Core-shell structure Bismuth oxide Bismuth metal Carbon nanotube

Electrocatalytic water splitting:Mechanism and electrocatalyst design

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Nano Research 2023年第7期16卷 9142-9157页

作者： Han WU Qiaoxian Huang Yuanyuan Shi Jiangwei Chang Siyu Lu Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001China

Hydrogen energy,a new type of clean and efficient energy,has assumed precedence in decarbonizing and building a sustainable carbon-neutral economy.Recently,hydrogen production from water splitting has seen considerable advancements owing to its advantages such as zero carbon emissions,safety,and high product purity.To overcome the large energy barrier and high cost of water splitting,numerous efficient electrocatalysts have been designed and reported.However,various difficulties in promoting the industrialization of electrocatalytic water splitting remain.Further,as high-performance electrocatalysts that satisfy industrial requirements are urgently needed,a better understanding of water-splitting systems is required.In this paper,the latest progress in water electrolysis is reviewed,and experimental evidence from in situ/operando spectroscopic surveys and computational analyses is summarized to present a mechanistic understanding of hydrogen and oxygen evolution reactions.Furthermore,some promising strategies,including alloying,morphological engineering,interface construction,defect engineering,and strain engineering for designing and synthesizing electrocatalysts are highlighted.We believe that this review will provide a knowledge-guided design in fundamental science and further inspire technical engineering developments for constructing efficient electrocatalysts for water splitting.

关键词： water splitting mechanism operando spectroscopy design strategy

Carbon-Dot-Enhanced Electrocatalytic Hydrogen Evolution

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Accounts of Materials Research 2022年第3期3卷 319-330页

作者： Han WU Siyu Lu Bai Yang Green Catalysis Center and College of Chemistry Zhengzhou UniversityZhengzhou 450001P.R.China State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012P.R.China

CONSPECTUS:Hydrogen evolution by the electrolysis of water is an important energy conversion process,especially for some intermittent energy systems.However,its practical applicability is limited by its low energy-conversion efficiency and the need for expensive electrocatalysts.In response,carbon-based nanocomposites have gained substantial interest as promising alternatives to the currently used precious metal catalysts.Among them,carbon dots(CDs)have exhibited many outstanding features,including flexible composition,high conductivity,good dispersion,and strong metal coordination.The past decade has seen remarkable advances in CD-based electrocatalysts for hydrogen evolution,where CDs and their derived hybrids have shown impressive performance and indispensable prospects for future hydrogen utilization.However,the widespread use of CD-based electrocatalysts still requires the development of high-quality CDs and advanced synthesis strategies.New assessment techniques are also required to elucidate the unique functions of CDs in composition regulation,structure fabrication,surface modification,and host−guest interactions in electrocatalysts and ultimately to establish the relationships among structure,composition,and activity.

关键词： gained catalytic Hydrogen

Progress on the mechanisms of Ru-based electrocatalysts for the oxygen evolution reaction in acidic media

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Journal of Energy Chemistry 2023年第10期85卷 220-238,I0008页

作者： Yuanyuan Shi Han WU Jiangwei Chang Zhiyong Tang Siyu Lu Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001HenanChina CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China

Water electrolysis using proton-exchange membranes is one of the most promising technologies for carbon-neutral and sustainable energy production.Generally,the overall efficiency of water splitting is limited by the oxygen evolution reaction(OER).Nevertheless,a trade-off between activity and stability exists for most electrocatalytic materials in strong acids and oxidizing media,and the development of efficient and stable catalytic materials has been an important focus of research.In this view,gaining in-depth insights into the OER system,particularly the interactions between reaction intermediates and active sites,is significantly important.To this end,this review introduces the fundamentals of the OER over Ru-based materials,including the conventional adsorbate evolution mechanism,lattice oxygen oxidation mechanism,and oxide path mechanism.Moreover,the up-to-date progress of representative modifications for improving OER performance is further discussed with reference to specific mechanisms,such as tuning of geometric,electronic structures,incorporation of proton acceptors,and optimization of metal-oxygen covalency.Finally,some valuable insights into the challenges and opportunities for OER electrocatalysts are provided with the aim to promote the development of next-generation catalysts with high activity and excellent stability.

关键词： Oxygen evolution reaction Ru-based electrocatalysts Acidic solutions Mechanism Proton-exchange membranes

Multiresponsive Luminescent Behaviors of Assembled Spirocyclic Nonanuclear Silver(I)Clusters

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CCS Chemistry 2022年第10期4卷 3364-3377页

作者： Han WU Siqi Zhang Liang Zhao Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084

Supramolecular assembly is regarded as an effective strategy to endow metal clusters with rich and unique photophysical properties.However,the detailed mechanisms and influential factors for intercluster assemblies and their effects on luminescent properties remain unclear to date.In this work,we constructed a series of spirocyclic nonanuclear silver cluster compounds with varying alkyl chain lengths,which demonstrated distinct supramolecular assembly behaviors depending on temperature,concentration,and solvent polarity.

关键词： silver compound supramolecular assembly mechanochromic luminescence aggregation-induced emission spirocyclic cluster