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Microwave-assisted synthesis of Cr_(3)C_(2)@C core shell structure anchored on hierarchical porous carbon foam for enhanced polysulfide adsorption in Li-S batteries

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Nano Research 2021年第7期14卷 2345-2352页

作者： Xierong Zeng Jianxin Tu Shuangshuang Chen Shaozhong Zeng Qi Zhang Jizhao Zou Kezhi Li Shenzhen Key Laboratory of Special Functional Materials&Shenzhen Engineering Laboratory for Advance Technology of ceramics College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Solidification Processing Carbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Anhui University of TechnologyMa'anshan 243002China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China BCMaterials Basque Center for MaterialsApplications and NanostructuresUPV/EHU Science Park48940 LeioaSpainIKERBASQUEBasque Foundation for Science48013 BilbaoSpain

In this paper,we use microwave reduction strategy to synthesize a new bi-functional sulfur host material at the service of cathode substrate for lithium-sulfur batteries(LSBs),the composite is made of hierarchical porous carbon foam supported carbon-encapsulated chromium carbide nano-particles(Cr_(3)C_(2)@C/HPCF),in which the well-distributed conductive Cr_(3)C_(2) nano-particles can act as powerful chemical adsorbent and are effective in restraining the shuttle effect of lithium polysulfides(LiPSs).Test results show that the Cr_(3)C_(2)@C/HPCF based sulfur electrodes with 75 wt.%of sulfur exhibit a high initial discharging capacity of 1,321.1 mAh·g^(−1) at 0.1 C(3.5 mg·cm^(−2)),and a reversible capacity can still maintain stability at 1,002.1 mAh·g^(−1) after 150 *** increasing the areal sulfur loading to 4 mg·cm^(−2),the electrodes can still deliver an initial discharging capacity of 948.0 mAh·g^(−1) at 0.5 C with ultra-slow capacity decay rate of 0.075%per cycle during 500 ***,the adsorption energy between the Cr_(3)C_(2) surface and LiPSs as well as theoretic analysis based on first-principles is also investigated.

关键词： Cr_(3)C_(2)nanoparticles core shell structure chemisorptions microwave reduction hierarchical porous carbon foam Li-S batteries

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Facilitating alkaline hydrogen evolution of Ru@Fe-NC with ultra-low overpotential: Optimized d-band center and lowered energy barrier for water dissociation

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Journal of Energy Chemistry 2025年 109卷 347-356页

作者： Xiaona Zhang Zeyang Liu Wenxuan Guo Wei An Zhaoyi Song Yizhang Du Tongjun Shen Qihao Qin Chunxia Wang Guoyong Huang Shengming Xu Junjie Mao State Key Laboratory of Heavy Oil Processing College of New Energy and Materials China University of Petroleum (Beijing) Beijing 102249 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 10084 China Beijing Key Lab of Fine Ceramics Tsinghua University Beijing 100084 China Key Laboratory of Functional Molecular Solids Ministry of Education College of Chemistry and Materials Science Anhui Normal University Wuhu 241000 Anhui China

The strong hydrogen binding affinity on Ru surfaces and their intrinsic aggregation tendency pose significant challenges to the hydrogen evolution reaction (HER) activity of Ru-based electrocatalysts. The construction of active electrocatalysts composed of partially dispersed nanoparticles (NPs) and individual single atomic site with robust thermodynamic stability, has emerged as a viable alternative to benchmark commercial HER electrocatalyst. Herein, a multi-step strategy was designed to synthesize Ru NP @Fe SA -NC electrocatalyst, and a robust interaction between uniformly dispersed Ru NPs and embedded single-atom Fe sites was uncovered, which not only regulates the particle size of Ru NPs but also controls the spin state and electronic configuration of Fe single atom. Moreover, magnetic characterization reveals that the synergetic effect induces a high spin state of the Fe atom with unpaired electrons in the 3 d orbitals, which enhances the adsorption of intermediates and accelerates the reaction kinetics. The as obtained electrocatalyst demonstrates a low overpotential of 13 mV at 10 mA cm −2 in alkaline condition. Remarkably, theoretical calculation indicates that the outstanding performance of Ru NP @Fe SA -NC stems from the Fe optimized electronic structure of the Ru site, which downshifts the d-band center, reduces the energy barriers for water dissociation and optimizes H* desorption, thereby promoting HER. This study presents an innovative approach to utilize Fe SA -NC to stabilize Ru NPs and reduce the energy barrier, contributing to an ideal HER performance.

关键词： d-band center Electrocatalytic hydrogen evolution reaction Ru nanoparticles Single-atomic Fe Theoretical calculation

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Near-equiatomic high-entropy decagonal quasicrystal in Al20Si20Mn20Fe20Ga20

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Science China materials 2021年第2期64卷 440-447页

作者： Haikun Ma Liangqun Zhao Zhi-Yi Hu Dinghao Miao Ruixuan Li Tulai Sun He Tian Tiantian Zhang Hua Li Yong Zhang Zhanbing He State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China Nanostructure Research Centre(NRC) State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan430070China School of Materials Science and Engineering Zhejiang UniversityHangzhou310027China

High-entropy alloys(HEAs)contain multiple principal alloying elements,but usually with simple crystal *** are structurally complex phases,but are generally dominated by only one ***,nearequiatomic high-entropy quasicrystals have rarely been reported because they are difficult to prepare experimentally and predict ***,the preparation and crystal structures of near-equiatomic high-entropy quasicrystals have drawn much *** report a quinary decagonal quasicrystal(DQC)with near-equiatomic alloying elements in Al20Si20Mn20Fe20Ga20 melt-spun ribbons,which is the first to our ***,the structural features of the DQC are characterized in *** configurational entropy of both the alloy and DQC satisfies the entropy-based criterion for HEAs,suggesting a high-entropy *** findings provide a new strategy to develop high-entropy quasicrystals.

关键词： high-entropy alloys decagonal quasicrystal high-entropy quasicrystals melt-spun ribbons high-angle annular dark-field scanning transmission electron microscopy

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Hydrogen Spillover Induced PtCo/CoOx Interfaces with Enhanced Catalytic Activity for CO Oxidation at Low Temperatures in Humid Conditions

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Small 2024年第22期20卷 2309181-2309181页

作者： Lin, Jiajin Zhao, Shuaiqi Yang, Jin Huang, Wei-Hsiang Chen, Chi-Liang Chen, Tingyu Zhao, Yun Chen, Guangxu Qiu, Yongcai Gu, Lin School of Environment and Energy State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control South China University of Technology Guangzhou510000 China School of Chemistry and Chemical Engineering Wuhan Textile University Wuhan430200 China National Synchrotron Radiation Research Center Hsinchu30076 Taiwan Hsinchu30076 Taiwan Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and Devices Laboratory of Advanced Materials and Electron Microscopy Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China

The development of catalysts with abundant active interfaces for superior low-temperature catalytic CO oxidation is critical to meet increasingly rigorous emission requirements, yet still challenging. Herein, this work reports a PtCo/CoOx/Al2O3 catalyst with PtCo clusters and enriched Pt─O─Co interfaces induced by hydrogen spillover from the Pt sites and self-oxidation process in air, exhibiting excellent performance for CO oxidation at low temperatures and humid conditions. The combination of structural characterizations and in situ Fourier transform infrared spectroscopy reveals that the PtCo cluster effectively prevents CO saturation/poisoning on the Pt surface. Additionally, the presence of Pt─O─Co interfaces in the PtCo/CoOx/Al2O3 catalyst provides a significant number of active sites for oxygen activation and ─OH formation. This facilitates efficient generation of CO2 at ambient temperature by coupling with nearby adsorbed CO molecules, resulting in superior low-temperature activity and long-term stability for CO oxidation under humid conditions. This work provides a facile route toward rationalizing the design of catalysts with more active interfaces for superior low-temperature CO oxidation under humid conditions for practical applications. © 2023 Wiley-VCH GmbH.

关键词： Binary alloys

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Synergistic enhancement of thermoelectric properties in carbon nanotube networks via biomass lignin

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Journal of Colloid and Interface Science 2025年 698卷 138057页

作者： Li, Hui Zhang, Han Zhu, Jianhao Hu, Ningjiang Du, Feipeng Liu, Siqi Erden, Fuat Yang, Ming Li, Pengcheng He, Chaobin Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials State Key Laboratory of Green and Efficient Development of Phosphorus Resources School of Materials Science and Engineering Wuhan Institute of Technology Wuhan430205 China Department of Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 117574 Singapore 117602 Singapore Department of Aeronautical Engineering Sivas University of Science and Technology Sivas58000 Turkey Hubei Integrative Technology and Innovation Center for Advanced Fiberous Materials 430299 China

Despite interconnected uniform carbon nanotubes (CNTs) networks can lead to ultrahigh electrical conductivity, the concomitant relatively low Seebeck coefficient results in an inferior thermoelectric (TE) power factor due to the typical trade-off relationship between electrical conductivity and Seebeck coefficient. Herein, we present a facile approach to enhance the TE performance of CNT composites by embedding lignin into highly conductive CNT network via a dip-coating approach. The energy filtering effect at the CNTs/lignin interfaces enables a significant improvement in the Seebeck coefficient. Concurrently, the preservation of the CNTs conductive network structure ensures continuous pathways for carrier transport, thereby maintaining a moderate magnitude of electrical conductivity despite the incorporation of insulating lignin. Through systematic optimization of lignin concentration and soaking duration, a maximum power factor of 550.5 μW m−1 K−2 is achieved for the CNTs/lignin composite prepared with a 2 mg mL−1 lignin solution for 5 min, superior to that of most reported CNTs based composite films. Considering the remarkable TE performance, a TE device comprising 5 pairs of CNTs/lignin films and Ni wires is fabricated to deliver a high output power of 220 nW at ΔT of 30 K. Moreover, the device exhibited remarkable temperature-sensing capabilities and stable voltage response, highlighting its potential application as a wearable power source and temperature sensor. This work not only provides a feasible strategy for synergistically enhancing the TE properties of CNT composites using biomass lignin, but also paves the way for the utilization of biomass lignin for wearable electronics. © 2025

关键词： Nanocomposite films

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Providing Ceramics High-Temperature Self-Lubrication by Inducing Vacancies Concentration Variation Via Thermal and Frictional Synergies

SSRN

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SSRN 2024年

作者： Li, Tao Lin, Pengyu Song, Junjie You, Xin Dong, Yaojun Sun, Qiuan Ding, Xue Zhang, Yongsheng Hu, Litian State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University Xi’an710072 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle Technology Beijing100076 China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai264006 China

Based on the new conception of lattice low-shear stress induced by zero-dimensional point defects, the Al2O3 composite ceramics doped by TiO2 with good high-temperature tribological properties are prepared. According to the results, temperature could control the continuity of the resintering friction layer and the activation of the plastic deformation ability of ceramics. The lattice oxygen in TiO2 leaves the original lattice occupation due to thermal and frictional coupling action, and breaks away from the worn surface, which significantly increases the vacancy concentration level. Aforesaid structural defects are considered to be a crucial reason for the reduction of shear force. This vacancy quantitative change strategy of temperature-sensibility is expected to become a controllable method for providing lubrication during high-temperature. © 2024, The Authors. All rights reserved.

关键词： Titanium dioxide

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Zero-Shot Remote Sensing Image Classification Algorithm Based on Improved CLIP Model

Zero-Shot Remote Sensing Image Classification Algorithm Base...

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Mechanical Engineering and Aerospace Engineering (MEAE), Asia Conference on

作者： Cheng Xu Zhengyu Ou Junjie Wang Zandong Han Department of Mechanical Engineering State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Tsinghua University Beijing China Training Base of Army Engineering University Xuzhou China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing China

ISBN: (数字)9798350352252

ISBN: (纸本)9798350352269

Zero-shot remote sensing image classification is of great significance in earth observation and environmental monitoring, as it can identify and classify new land cover types without labeled data, significantly reducing the cost of manual annotation. However, traditional methods often rely on subjective attribute definitions, limited semantic embeddings, complex generative model training, high-quality graph construction, and costly cross-modal learning, leading to performance limitations. This paper proposes an innovative approach based on the CLIP (Contrastive Language-Image Pre-training) model. The method first utilizes the CLIP model to make initial predictions on remote sensing images, generating pseudo-labels and constructing a cache. Then, it calculates the similarity between the test images and the images in the cache to obtain the classification probability of the test images. Finally, it combines the similarity results with the initial CLIP predictions in a weighted manner to form the final classification result. The experimental results on four typical remote sensing datasets demonstrate that the method proposed in this paper can improve the accuracy of zero-shot remote sensing image classification.

关键词： Training Semantics Land surface Manuals Probability Predictive models Prediction algorithms Mechanical engineering Remote sensing Image classification

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Ultrastrong and ductile(CoCrNi)_(94)Ti_(3)Al_(3)medium-entropy alloys via introducing multi-scale heterogeneous structures

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Journal of materials Science & technology 2023年第4期135卷 241-249页

作者： Jianying Wang Jianpeng Zou Hailin Yang Xixi Dong Peng Cao Xiaozhou Liao Zhilin Liu Shouxun Ji State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Brunel Centre for Advanced Solidification Technology(BCAST) Brunel University LondonUxbridgeMiddlesex UB83PHUnited Kingdom Department of Chemical and Materials Engineering The University of Auckland1142New Zealand School of Aerospace Mechanical&Mechatronic EngineeringThe University of SydneySydneyNSW 2006Australia Light Alloy Research Institute College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China

The coarsening-grained single-phase face-centered cubic(fcc)medium-entropy alloys(MEAs)normally exhibit insufficient strength for some engineering ***,superior mechanical properties with ultimate tensile strength of 1.6 GPa and fracture strain of 13.1%at ambient temperature have been achieved in a(CoCrNi)_(94)Ti_(3)Al_(3)MEA by carefully architecting the multi-scale heterogeneous *** microscopy characterization indicates that the superior mechanical properties mainly originated from the favorable heterogeneous fcc matrix(1-40μm)and the coherent sphericalγ’precipitates(10-100 nm),together with a high number density of crystalline defects(2-10 nm),including dislocations,small stacking faults,Lomer-Cottrell locks,and ultrafine deformation twins.

关键词： Medium-entropy alloys Mechanical properties Heterogeneous structure γ’nanoprecipitates Crystalline defects

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Ultrafine ordered L1_(2)-Pt-Co-Mn ternary intermetallic nanoparticles as high-performance oxygen-reduction electrocatalysts for practical fuel cells

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Journal of Energy Chemistry 2024年第6期93卷 157-165,I0005页

作者： Enping Wang Liuxuan Luo Yong Feng Aiming Wu Huiyuan Li Xiashuang Luo Yangge Guo Zehao Tan Fengjuan Zhu Xiaohui Yan Qi Kang Zechao Zhuang Daihui Yang Shuiyun Shen Junliang Zhang China-UK Low Carbon College Shanghai Jiao Tong UniversityShanghai 201306China Institute of Fuel Cells Key Laboratory for Power Machinery and Engineering of MOESchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Tangfeng Energy Technology Co.Ltd. Shanghai 201306China State Key Laboratory of Advanced Chemical Power Sources Guizhou Meiling Power Sources Co.Ltd.Zunyi 563003GuizhouChina School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China Institute of New Energy for Vehicles School of Materials Science and EngineeringTongji UniversityShanghai 201804China Department of Chemical Engineering Columbia UniversityNY 10027USA

The long-range periodically ordered atomic structures in intermetallic nanoparticles(INPs)can significantly enhance both the electrocatalytic activity and electrochemical stability toward the oxygen reduction reaction(ORR)compared to the disordered atomic structures in ordinary solid-solution alloy ***,through a facile and scalable synthetic method,a series of carbon-supported ultrafine Pt_3Co_(x)Mn_(1-x)ternary INPs are prepared in this work,which possess the"skin-like"ultrathin Pt shells,the ordered L1_(2) atomic structure,and the high-even dispersion on supports(L1_(2)-Pt_3Co_(x)Mn_(1-x)/~SPt INPs/C).Electrochemical results present that the composition-optimized L1_(2)-Pt_3Co_(0.7)Mn_(0.3)/~SPt INPs/C exhibits the highest electrocata lytic activity among the series,which are also much better than those of the pristine ultrafine Pt/***,it also has a greatly enhanced electrochemical *** addition,the effects of annealing temperature and time are further *** importantly,such superior ORR electrocatalytic performance of L1_(2)-Pt_3Co_(0.7)Mn_(0.3)/~SPt INPs/C are also well demonstrated in practical fuel *** characterization analyses further reveal the major origins of the greatly enhanced ORR electrocata lytic performance:the Pt-Co-Mn alloy-induced geometric and ligand effects as well as the extremely high L1_(2) atomic-ordering *** work not only successfully develops a highly active and stable ordered ternary intermetallic ORR electrocatalyst,but also elucidates the corresponding"structure-function"relationship,which can be further applied in designing other intermetallic(electro)catalysts.

关键词： Platinum Cobalt Manganese Oxygen reduction reaction Ordered intermetallic L1_(2)atomic structure Proton-exchange membrane fuel cell

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Controlling Aluminum Oxidation in Cuinal Precursor Films: Significance for Achieving High-Performance Cu(Inal)Se2 Solar Cells

SSRN

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SSRN 2023年

作者： Han, Junsu Zhao, Ming Zhuang, Daming Wang, Hanpeng Tong, Hao Tao, Shengye Dong, Liangzheng Jia, Mengyao Wang, Yafei School of Materials Science and Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory for New Ceramics and Fine Processing Tsinghua University Beijing100084 China College of Mechanical and Vehicle Engineering Taiyuan University of Technology Taiyuan030024 China

In this work, we demonstrate the effects of aluminum and aluminum oxide within CuInAl precursor films on the formation process of Cu(InAl)Se2 (CIASe) thin films. We carried out a large number of experiments to optimize the conditions for obtaining CIASe thin films with excellent adhesion and electrical properties. Our findings suggest that the fabrication conditions of the precursor films, such as the vacuum level of sputtering chamber and the structure of the precursor films, significantly affect to the growth of the CIASe layer during selenization annealing. Through a series of experiments, we successfully obtained a 2.4 μm-thick CIAS thin film with strong adhesion to the Mo-coated substrate and fabricated a CIASe solar cell with an efficiency of 7.7%. Our study demonstrates the great potential of the two-step fabrication approach for CIASe thin film production, and further improvements are expected by optimizing the fabrication conditions. © 2023, The Authors. All rights reserved.

关键词： Thin films

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