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Bifunctional Dimethyldichlorosilane Assisted Air-Processed Perovskite Solar Cell with Enhanced Stability and Low Voltage Loss

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SSRN 2022年

作者： Zhou, Peng Lu, Shaojuan Mo, Yanping Cheng, Jiahao Jiao, Chuanjia Zhang, Xiao-Li Li, Wangnan Liang, Guijie Wang, Jingyang Huang, Fuzhi Cheng, Yi-Bing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Institute of Aerospace Chemotechnology Xiangyang441003 China Hubei key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang441053 China School of Materials Science and Engineering Zhengzhou University Henan Province 450001 China Hubei Longzhong Laboratory Xiangyang441000 China Solar Hydrogen Production Lab Foshan Xianhu Laboratory of the Advanced Energy Science Technology Guangdong Laboratory Foshan China

Perovskite solar cells (PSCs) attract great interest due to high-efficiency and low-cost. However, perovskite materials are sensitive to moisture, causing it cannot be prepared in air, which increase the manufactory cost. To address it, we employ dimethyldichlorosilane (DMDCS) to passivate the grain boundaries and surfaces of MAPbI3 perovskite films, thus inhibiting the erosion of water. Then the preparation of highly efficient PSCs in air atmosphere is realized. The passivation mechanism of DMDCS on the perovskite film and interface is analyzed via investigating photo-excited carrier mobility and ultrafast transient adsorption spectroscopy (TAS). The results of TAS exhibit an improvement of charge carrier diffusion with an enhanced lifetime from 7.62 ps to 11.22 ps by the precursor doping. The charge carrier extraction at the interface is also greatly promoted with the decreased decay time from 0.29 ns to 0.16 ns by surface passivation, consistent well with the carrier mobility via space charge limited current (SCLC). The modified devices demonstrate an excellent efficiency of 20.69%, with a fill factor exceeding 80%. The optimized devices exhibit an excellent long-term environmental stability, retaining more than 80% of the initial efficiency after 1000 h in ambient with a relative humidity of 40 RH % without encapsulation. © 2022, The Authors. All rights reserved.

关键词： Perovskite solar cells

Reliable Synthesis of Large-Area Monolayer WS2 Single Crystals, Films, and Heterostructures with Extraordinary Photoluminescence Induced by Water Intercalation

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arXiv

arXiv 2023年

作者： Zhang, Qianhui Lu, Jianfeng Wang, Ziyu Dai, Zhigao Zhang, Yupeng Huang, Fuzhi Bao, Qiaoliang Duan, Wenhui Fuhrer, Michael S. Zheng, Changxi Department of Civil Engineering Monash University ClaytonVIC3800 Australia School of Chemistry Monash University ClaytonVIC3800 Australia Department of Material Science and Engineering Monash University ClaytonVIC3800 Australia State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Monash Centre for Atomically Thin Materials Monash University ClaytonVIC3800 Australia Monash University ClaytonVIC3800 Australia

Two-dimensional (2D) transition metal dichalcogenides (TMDs) hold great potential for future low-energy optoelectronics owing to their unique electronic, optical, and mechanical properties. Chemical vapor deposition (CVD) is the technique widely used for the synthesis of large-area TMDs. However, due to high sensitivity to the growth environment, reliable synthesis of monolayer TMDs via CVD remains challenging. Here we develop a controllab.e CVD process for large-area synthesis of monolayer WS2 crystals, films, and in-plane graphene-WS2 heterostructures by cleaning the reaction tube with hydrochloric acid, sulfuric acid and aqua regia. The concise cleaning process can remove the residual contaminates attached to the CVD reaction tube and crucibles, reducing the nucleation density but enhancing the diffusion length of WS2 species. The photoluminescence (PL) mappings of a WS2 single crystal and film reveal that the extraordinary PL around the edges of a triangular single crystal is induced by ambient water intercalation at the WS2-sapphire interface. The extraordinary PL can be controlled by the choice of substrates with different wettabilities. Copyright © 2023, The Authors. All rights reserved.

关键词： Chemical vapor deposition

Regulating Electron Transfer Pathway in Au/W18o49 Heterostructures by Structural Design for Revealing the Photocatalytic Mechanism of Metal / Semiconductor Heterostructures

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SSRN 2022年

作者： Zhang, Yuheng Wang, Yanan Yang, Shuai He, Fangyu Yan, Jun Yang, Zhengwen Zhou, Dacheng Long, Zhangwen Wang, Qi Qiu, Jianbei Faculty of Material Science and Engineering Kunming University of Science and Technology Kunming650093 China Key Lab. of Advanced Materials of Yunnan Province Kunming650093 China School of Chemistry and Chemical and Engineering Guangxi Minzu University Nanning530006 China

The construction of metal/semiconductor heterostructures is a useful technique for improving the electron-hole separation of Semiconductor Photocatalysts. However, there only are a few studies on the mechanism of electron transfer between metal/semiconductor heterostructures. Therefore, through the intelligent design of the material structure, two metal/semiconductor heterostructures (Au / W 18 O 49 heterostructure) were fabricated with identical composition but different structures by different preparation methods. The results demonstrated that the two materials went through completely different electron transfer paths, and these different electron transfer path also leads to an opposite set of photocatalytic properties. Therefore, we believe that the structural characteristics of metal/semiconductor heterostructure have a great influence on the electron transfer path. Our work renders useful information that may facilitate the design of heterostructure photocatalyst based on metal/semiconductors. © 2022, The Authors. All rights reserved.

关键词： Heterojunctions

Intercalation Engineering of Nickle-Cobalt-Layered Double Hydroxide for Long-Lifespan Supercapacitor

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SSRN 2023年

作者： Hu, Wenxuan Chen, Lu Geng, Biao Song, Yihu Wu, Ziliang Zheng, Qiang Shan, Gurong Du, Miao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou310058 China Zhejiang Provincial Key Lab for Chemical and Biological Processing Technology of Farm Product School of Biological and Chemical Engineering Zhejiang University of Science and Technology Hangzhou310023 China State Key Laboratory of Chemical Engineering College of Chemical and Biological Engineering Zhejiang University Hangzhou310058 China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030000 China

Layered double hydroxides (LDHs), a class of 2D lamellar intercalating materials, is a promising candidate for high-performance supercapacitors, while its poor cycling stability has always been its Achille’s heel. Although doping metal ions into the host layer is proved to be an effective way to improve the weakness, the effects of intercalated anions on cycling performance have been rarely studied and highly underestimated. In this paper, we prepared a group of NiCo-LDHs with different intercalated anions, including NO3-, Cl-, SO42-, MoO42- and WO42-, which expand the interlayer spacing from 0.73 to 1.07 nm. Interestingly, although expanding the interlayer spacing could increase the specific capacity by providing more electrochemical active sites, it could not guarantee the improvement in cycling performance and rate capability. The correlation between interlayer spacing and cycling performance exhibits a "volcano" plot. The MoO42- intercalated NiCo-LDH with a 0.96 nm interlayer spacing delivers a high specific capacity of 795 C g-1 and the best cycling stability with 80% capacity retention after 20000 cycles, which is better than NiCo-LDH-NO3 (0.73 nm, 50% after 3000 cycles) and NiCo-LDH-WO4 (1.07 nm, 64% after 20000 cycles). By combining the results with the DFT method, the effects of intercalated anion on cycling performance are illustrated. In addition, the asymmetric supercapacitor also exhibits an excellent cycling stability with ~100% capacity retention after 10000 cycles. This study provides new insight to the compositional design of LDH-based electrodes for long-lifespan supercapacitors. © 2023, The Authors. All rights reserved.

关键词： Cobalt compounds

Enhanced CoCrFeNi (TiC) 0.2 high-entropy alloy by thermodynamic treatment

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SSRN 2025年

作者： Liang, Shiqing Tu, Bingtian Li, Peiyao Chen, Xiaohong Li, Jiaqi Li, Jun Wei, Qinqin Shen, Qiang Hubei Longzhong Laboratory Hubei Xiangyang441000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Refractories Wuhan University of Science and Technology Wuhan430081 China

CoCrFeNi based high-entropy alloy has good strength and toughness properties compared to conventional alloys, showing great application prospects in advanced fields such as aerospace structural materials. However, the yield strength of the as-cast CoCrFeNi(TiC)0.2 alloy remains low, limiting its practical application as a high-strength structural material. In this study, we enhance the CoCrFeNi(TiC)0.2 alloy by hot rolling and annealing, which promotes the ultrafine carbide precipitation, partial recrystallization of the alloy matrix, and residual high-density dislocations. The secondphase strengthening of carbide precipitation, fine-grain strengthening of alloy matrix, and dislocation strengthening jointly improve the yield strength. The yield strength of the CoCrFeNi(TiC)0.2 alloy after thermomechanical treatment at 700°C for 1 h has a high yield strength of 865 MPa, ultimate tensile strength of 1047 MPa and uniform elongation of 6.8%. This study provides a theoretical guidance for the composition and technological design of high performance alloys. © 2025, The Authors. All rights reserved.

关键词： Tensile strength

Enhanced CoCrFeNi(TiC) 0.2 high-entropy alloy by thermodynamic treatment

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materials Today Communications 2025年 47卷

作者： Shiqing Liang Bingtian Tu Peiyao Li Xiaohong Chen Jiaqi Li Jun Li Qinqin Wei Qiang Shen Hubei Longzhong Laboratory Xiangyang Hubei 441000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Refractories Wuhan University of Science and Technology Wuhan 430081 China

CoCrFeNi-based high-entropy alloys exhibit superior strength and toughness properties compared to conventional alloys with promising aerospace structural applications. However, the strength of the as-cast CoCrFeNi(TiC) 0.2 alloy remains low, limiting its practical application as a high-strength structural material. In this study, we enhance the CoCrFeNi(TiC) 0.2 alloy by hot rolling and annealing, which promotes the ultrafine carbide precipitation, partial recrystallization of the alloy matrix, and residual high-density dislocations. The second-phase strengthening of carbide precipitation, fine-grain strengthening of alloy matrix, and dislocation strengthening jointly improve the yield strength. The CoCrFeNi(TiC) 0.2 alloy subjected to 50 % hot rolling followed by thermomechanical treatment at 700°C for 1 h demonstrates excellent mechanical properties, exhibiting a yield strength of 865 MPa, an ultimate tensile strength of 1047 MPa, and a uniform elongation of 6.8 %. This study provides a theoretical guidance for the composition and technological design of high performance alloys.

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Zwitterionic glycine modified Fe/Mg-layered double hydroxides for highly selective and efficient removal of oxyanions from polluted water

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Journal of materials Science & technology 2020年第16期47卷 8-15页

作者： Xiaofeng Shi Chao Wang Jiaoxia Zhang Li Guo Jing Lin Duo Pan Juying Zhou Jincheng Fan Tao Ding Zhanhu Guo Advanced Energy Materials and Systems Institute North University of ChinaTaiyuan 030051China School of Materials Science and Engineering North University of ChinaTaiyuan 030051China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China College of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410114China Integrated Composites Lab(1CL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA School of Chemistry and Chemical Engineering Guangxi University for NationalitiesNanning 530006China College of Chemistry and Chemical Engineering Henan UniversityKaifeng 475004China

Zwitterionic glycine was employed to modify Fe/Mg-layered double hydroxides(LDH)to realize an GFe/Mg-LDH adsorbent with high adsorption capacities of oxygen-containing anions including As(Ⅴ),P(Ⅴ)and Cr(Ⅵ).When the Fe/Mg mole ratio was 0.02 mol/0.02 mol,the G-Fe/Mg-LDH has a good adsorption *** optimum adsorption pH value of G-Fe/Mg-LDH for oxygen-containing anions was *** selectivity of three oxygen-containing anions was Cr(Ⅵ)

关键词： Glycine Water treatment Arsenic Oxyanions Selective adsorptio

Biomimetic Design of MOFs-Based Nanocarriers Advances Aqueous Lubrication and Anti-Inflammatory Drug Release

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SSRN 2023年

作者： Wu, Wei Gong, Peiwei Zhang, Weixi Lin, Xiao Xue, Huidan Liu, Jianxi State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials School of Materials Science and Engineering Northwestern Polytechnical University Xi’an710072 China The Key Laboratory of Life-Organic Analysis School of Chemistry and Chemical Engineering Qufu Normal University Qufu273165 China School of Food and Biological Engineering Shaanxi University of Science and Technology Xi’an710021 China Key Lab for Space Biosciences and Biotechnology Research Center for Special Medicine and Health Systems Engineering School of Life Sciences Northwestern Polytechnical University Xi’an China

This work demonstrates surface assembling of partially acidified sodium hyaluronate (SHA) biomacromolecule on drug-loaded metal-organic frameworks nanoparticles (nanoMOFs) that can achieve aqueous lubrication and anti-inflammatory drug release for synergistic therapy of osteoarthritis (OA). Sodium hyaluronate was partially acidified to transform part of the sodium carboxylate to be carboxylic acid (SHA-COOH), which could coordinatively assembled on the UiO-66 and UiO-67 nanocarriers. Surface functionalization of the nanoMOFs with SHA-COOH polymer greatly enhanced their aqueous dispersion stability and lubricating performance due to the strong dipole-charge interaction between sodium ion and water molecules. Reductions over 50% and 96% in both coefficient of friction and wear volume were achieved by adding the UiO-66@SHA-COOH and UiO-67@SHA-COOH in water, which possessed high load-carrying capacity and long-term durability. After loading with aspirin as anti-inflammatory drug, the nanocarriers showed sustained drug release, which benefitted the drug delivery efficiency. Excellent anti-wear performance and extended drug release of the UiO-67@SHA-COOH additives were demonstrated to compare with that of the UiO-66@SHA-COOH due to the higher pore sizes. By co-culturing the aspirin-loaded UiO-67@SHA-COOH with C-28/I2 cells, the nanocarriers showed good biocompatibility and anti-inflammatory effect through tuning the expression of OA-related genes of human normal chondrocytes with inflammation. Our work supported biomacromolecule-functionalized nanoMOFs as a potential dual-functional nanocarriers for biomedical applications. © 2023, The Authors. All rights reserved.

关键词： Pore size

Synergistic Effect of Ag and Cu on Improving in Vitro Biological Properties of K2ti6o13 Nanowires for Potential Biomedical Applications

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SSRN 2022年

作者： Lei, Shichang Qi, Yumin Zhao, Lichen Shen, Yutian An, Hailong Qu, Chang Wang, Xin Wang, Gaojiong Cui, Chunxiang Key Lab. for New Type of Functional Materials in Hebei Province School of Materials Science and Engineering Hebei University of Technology Tianjin300401 China Key Laboratory of Advanced Materials Ministry of Education Tsinghua University Beijing100084 China Key Laboratory of Molecular Biophysics Hebei Province Institute of Biophysics School of Health Sciences and Biomedical Engineering Hebei University of Technology Tianjin300401 China State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Electrical Engineering Hebei University of Technology Tianjin300130 China

The development of novel nanomaterials with synergistic biological effects has attracted extensive interest of the researchers. In the study, KTO with the doping amount of 0.5 mol% Ag and 0.5 mol% Cu (0.5 Ag-0.5 Cu-KTO) nanomaterial was successfully synthesized using two-step method of sol-gel and hydrothermal. The crystal structure of 0.5 Ag-0.5 Cu-KTO was still monoclinic KTO, Ag and Cu ions replacing partial Ti ions of KTO lattice. High specific surface area of 0.5 Ag-0.5 Cu-KTO (337.6 m 2 /g) provides more surface active sites for adsorption and Cu-Ag doping. More negative surface zeta potential (-32.83 mV in phosphate buffer solution (PBS) and -21.45 mV in physiological saline solution (PSS), respectively) would be beneficial to prevent the aggregation of the nanowires in physiological environment. Under the same doping amount, compared to single Cu doped KTO with the doping amount of 1.0 mol%, 0.5 Ag-0.5 Cu-KTO exhibited better antibacterial performance against gram-negative and gram-positive bacteria at only 100 μg/mL dose concentration, near to 1.0 mol% Ag doped KTO. And 0.5 Ag-0.5 Cu-KTO showed more excellent biocompatibility than 1.0 Ag-KTO, which was attribute to the introduction of Cu ions effectively decreasing the hemolytic and cytotoxic risks from Ag ions. As expected, the synthesized 0.5 Ag-0.5 Cu-KTO nanowires demonstrated excellent structural stability, high antibacterial activity, good hemocompatibility and cytocompatibility owing to the synergistic biological effects of Cu and Ag ions. 0.5 Ag-0.5 Cu-KTO nanowires will be a promising antimicrobial candidate for biomedical applications. © 2022, The Authors. All rights reserved.

关键词： Nanowires