检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Xiang, Jin Wang, Fei Liang, Xiao Duan, Dawei Yuan, Mingjian Wu, Tom Hu, Hanlin Shi, Yumeng International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics Shenzhen University Shenzhen518060 China Hoffmann Institute of Advanced Materials Shenzhen Polytechnic University Shenzhen518055 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China College of Chemistry and Chemical Engineering Jishou University Hunan Jishou416000 China College of Chemistry Nankai University Tianjin300071 China Department of Applied Physics The Hong Kong Polytechnic University Kowloon999077 Hong Kong Key Laboratory of Luminescence and Optical Information Ministry of Education School of Physical Science and Engineering Beijing Jiaotong University Beijing100044 China

The integration of 2D/3D mixed-dimensional structures in perovskite solar cells (PSCs) has been demonstrated to substantially improve both their photovoltaic performance and device stability. However, the detailed formation mechanism of these mixed-dimensional perovskite phases remains largely unexplored. In this study, we investigate the in-depth formation evolution of mixed-dimensional perovskite phases using the pre-adding method under both one-step and two-step processing condition, where the HTAB ligand molecule is introduced into the perovskite precursor solution beforehand. In the two-step sequential deposition method, 2D perovskite phases formed sequentially via 2D-α/β/γ (upon the assistance of IPA solvent) → 2D-7.6° (upon thermal annealing) → 2D-7.3° (upon thermal annealing). Conversely, in the one-step method, a distinct progression is noted: 2D-7.6° (HTAB ligand react with intermediate phase) → 2D-7.3°. The 2D-α/β/γ phases exhibit extremely thin, belt-like crystals that cover the 3D perovskite surface, the 2D-7.6° phase trends to envelop the 3D perovskite grains without clear crystal morphology, while the 2D-7.3° phase forms distinct platelet-shaped crystals interspersed among the 3D perovskite grains. Leveraging the defect passivation properties of those mixed-dimensional perovskite phases, as well as improved film morphology and crystallinity adjusted by HTAB ligand, an external electroluminescence quantum efficiency (EQELED) of 13.5% is achieved in PSCs with a non-radiative voltage loss of just 52 mV, promoting the power conversion efficiency to 24.54%. This work offers the significant insights into the phase-transition of mixed-dimensional perovskite and their impact on the optoelectronic properties. © 2024, The Authors. All rights reserved.

关键词： Perovskite

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Facile formation of tetragonal-Nb2O5 microspheres for high-rate and stable lithium storage with high areal capacity

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Science Bulletin 2020年第14期65卷 1154-1162,M0003页

作者： Zhiquan Hu Qiu He Ziang Liu Xiong Liu Mingsheng Qin Bo Wen Wenchao Shi Yan Zhao Qi Li Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

Niobium pentoxide;Ion and electron transport;Mass loading;Areal capacity;Lithium-ion batteryNiobium pentoxide(Nb2 O5) has attracted great attention as an anode for lithium-ion battery, which is attributed to the high-rate and good stability performances. In this work, TT-, T-, M-, and H-Nb2 O5 microspheres were synthesized by a facile one-step thermal oxidation method. Ion and electron transport properties of Nb2 O5 with different phases were investigated by both electrochemical analyses and density functional theoretical calculations. Without nanostructuring and carbon modification, the tetragonal Nb2 O5(M-Nb2 O5) displays preferable rate capability(121 m Ah g^-1 at 5 A g^-1), enhanced reversible capacity(163 m Ah g^-1 at 0.2 A g^-1) and better cycling stability(82.3% capacity retention after 1000 cycles)when compared with TT-, T-, and H-Nb2 O5. Electrochemical analyses further reveal the diffusioncontrolled Li+intercalation kinetics and in-situ X-ray diffraction analysis indicates superior structural stability upon Li+intercalation/deintercalation. Benefiting from the intrinsic fast ion/electron transport, a high areal capacity of 2.24 m Ah cm^-2 is obtained even at an ultrahigh mass loading of 22.51 mg cm^-*** work can promote the development of Nb2 O5 materials for high areal capacity and stable lithium storage towards practical applications.

关键词： Niobium pentoxide Ion and electron transport Mass loading Areal capacity Lithium-ion battery

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Remediation of diesel-oil contaminated soils using an innovative nanobubble and electrolyzed catalytic system

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Journal of Cleaner Production 2023年 432卷

作者： Chen, Wei-Ting Chun-Te Lin, Justin Chen, Shih-Hsiung Verpoort, Francis Hong, Kun-Liang Surampalli, Rao Y. Kao, Chih-Ming Institute of Environmental Engineering National Sun Yat-Sen University Kaohsiung Taiwan Department of Environmental Engineering and Science Feng Chia University Taichung Taiwan Department of Environmental Engineering and Science Chia Nan University of Pharmacy and Science Tainan Taiwan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Suzhou Dingdedian Environmental Protection Technology Co. Ltd. Suzhou China Global Institute for Energy Environment and Sustainability LenexaKS United States

Soil contamination resulting from petroleum hydrocarbons poses a significant environmental challenge. In this research, an innovative electrolyzed catalytic system was devised to produce nanobubble-enriched catalytic water, which was employed for remediating soils contaminated with diesel oil. This novel system harnessed high voltage (220 V) via direct current, utilizing titanium electrodes coated with iridium dioxide. The inclusion of iron-copper hybrid oxide catalysts between the electrodes was instrumental in enhancing the efficiency of radical generation. The study employed the electron paramagnetic resonance (EPR) technique and the Rhodamine B (RhB) method to analyze the species and concentration of the generated radicals. EPR is a versatile tool for investigating materials with unpaired electrons and is capable of quantifying reaction kinetics for transition metals. RhB can be used as a probe for hydroxyl radical concentration determination. The addition of an electrolyte (NaCl or K2SO4) could enhance the electrolytic reaction and improve radical production rate. By incorporating 20 mM of K2SO4 and utilizing 75 g of catalyst per 500 mL batch of nanobubble-contained electrolyzed catalytic water (NECW) production, with a current density of 20 mA/cm2, a highly oxidized nanobubble-infused electrolyzed catalytic water was successfully generated. This water exhibited an oxidation-reduction potential of 887 mV and contained a radical concentration of 7.6 × 10−13 M, encompassing hydroxyl, superoxide, and sulfate radicals. Furthermore, it displayed a negative zeta potential of −39.8 mV, along with nanobubbles averaging 28 nm in diameter and a nanobubble density of 3.7 × 109 particles per milliliter. The presence of nanobubbles in electrolyzed catalytic water, owing to their negative zeta potential and nano-scale attributes, imparts a repulsive force that hinders bubble aggregation and prolongs their existence. When these nanobubbles burst, the resulting radicals contri

关键词： Oxidation

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Origin of Increased Curie Temperature in Lithium-Substituted Ferroelectric Niobate Perovskite: Enhancement of the Soft Polar Mode

arXiv

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arXiv 2024年

作者： Thong, Hao-Cheng Yao, Fang-Zhou Cai, Xian-Xian Xu, Ze Zhang, Mao-Hua Zhang, Huazhang Xu, Ben Wei, Yan Wang, Shi-Dong Wang, Ke State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Research Center for Advanced Functional Ceramics Wuzhen Laboratory Jiaxing314500 China School of Physics and Mechanics Wuhan University of Technology Wuhan430070 China Graduate School China Academy of Engineering Physics Beijing100193 China Department of Geriatric Dentistry NMPA Key Laboratory for Dental Materials National Engineering Laboratory for Digital and Material Technology of Stomatology Peking University School Hospital of Stomatology Beijing100081 China Musculoskeletal Tumor Center Peking University People’s Hospital Beijing100044 China

The functionality of ferroelectrics is often constrained by their Curie temperature, above which depolarization occurs. Lithium (Li) is the only experimentally known substitute that can increase the Curie temperature in ferroelectric niobate-based perovskites, yet the mechanism remains unresolved. Here, the unique phenomenon in Li-substituted KNbO3 is investigated using first-principles density functional theory. Theoretical calculations show that Li substitution at the A-site of perovskite introduces compressive chemical pressure, reducing Nb–O hybridization and associated ferroelectric instability. However, the large off-center displacement of the Li cation compensates for this reduction and further enhances the soft polar mode, thereby raising the Curie temperature. In addition, the stability of the tetragonal phase over the orthorhombic phase is predicted upon Li substitution, which reasonably explains the experimental observation of a decreased orthorhombic-to-tetragonal phase transition temperature. Finally, a metastable anti-phase polar state in which the Li cation displaces oppositely to the Nb cation is revealed, which could also contribute to the variation of phase transition temperatures. These findings provide critical insights into the atomic-scale mechanisms governing Curie temperature enhancement in ferroelectrics and pave the way for designing advanced ferroelectric materials with improved thermal stability and functional performance. © 2024, CC BY.

关键词： Perovskite

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Oxygen vacancies in metal oxides: recent progresstowards advanced catalyst design

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Science China materials 2020年第11期63卷 2089-2118页

作者： Guoxin Zhuang Yawen Chen Zanyong Zhuang Yan Yu Jiaguo Yu College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China Key Laboratory of Advanced Materials Technologies(Fuzhou University) Fujian Province UniversityFuzhou 350108China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Energy crisis and environmental problems urgently drive the proposal of new strategies to improve human wellbeing and assist sustainable *** this end,scientists have explored many metal oxides-based photocatalysts with high stability,low cost,earth abundance,and potentially high catalytic activity relevant for key applications such as H2O splitting,CO2 reduction,N2 fixation,and advanced oxidation of *** these metal oxides,oxygen vacancies(OVs)are ubiquitous and intrinsic defects with pronounced impacts on the physicochemical properties of the catalysts,which may open new opportunities for obtaining efficient metal *** thorough understanding of the structural and electronic nature of OVs is necessary to determine how they serve as catalytically active *** this review,we summarize the origin of OVs,the strategies to introduce OVs,as well as the fundamental structure-activity relationships to relate these crystal defects to catalyst properties including light absorption,charge separation,*** emphasize the mechanism of OVs formation and their effects on the intrinsic catalytic characteristics of the metal *** also present some multicomponent catalytic platforms where OVs contribute to catalysis via ***,opportunities and challenges on engineering defects in photocatalysts are summarized to highlight the future directions of this research field.

关键词： oxygen vacancy catalysis defect engineering energy and environment metal oxide

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Hierarchically Ultrasmall Hf-Based Mof: Mesopore Adjustment and Reconstruction by Recycle Using Acid Etching Strategy

SSRN

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SSRN 2022年

作者： Xu, Guihua He, Qiaoning Huang, Kexin Wang, Ying Pu, Chun Chang, Ganggang Yang, Xiao-Yu School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States School of Chemistry Chemical Engineering and Life Science State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China State Key Laboratory of Biocatalysis and Enzyme Engineering Environmental Microbial Technology Center of Hubei Province School of Life Sciences Hubei University Hubei Wuhan430062 China

Benefiting from unique properties including faster mass transfer, more exposed active sites and large molecule recognition, hierarchically porous metal-organic frameworks (HP-MOFs), in the form of ultrasmall nanoparticles (NPs) and having self-assembled interparticle mesopores, have garnered greater attention in recent years that given to typical MOFs. However, the controllable synthesis of HP-MOFs on the nanoscale remains a significant challenge. Herein, we describe the results of a study that led to the development of the first, facile top-down acid etching method for preparing the nanosized (~15 nm) mesoporous MOF, HP-UiO-66-NH2(Hf). The sizes of mesopores in this material can be effectively tuned by simply controlling the concentration of propionic acid (PA) utilized in the preparation solution. Remarkably, the mesoporous structure of HP-UiO-66-NH2(Hf) exhibits excellent chemical stability under acid/base conditions and it can be readily constructed by using at least 4 times recycled PA etching solution. In addition, HP-UiO-66-NH2(Hf) displays high size-selectivity for adsorption of enzymes. Moreover, the nanocomposite generated by complexation with glucose oxidase (GOD), GOD@HP-UiO-66-NH2(Hf) has a higher catalytic activity and a significantly enhanced stability (recycled for at least 7 times) in promoting oxidation of glucose compared to its MOF counterpart, GOD@UiO-66-NH2(Hf) and native GOD. This study provides a potentially general strategy to design and construct stable nanosized HP-MOFs which have applications to large molecule encapsulation and catalysis. © 2022, The Authors. All rights reserved.

关键词： Glucose oxidase

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MoSe2 nanosheets as a functional host for lithium-sulfur batteries

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能源化学 2020年第8期47卷 241-247页

作者： Lishun Meng Yuan Yao Jing Liu Zhao Wang Dong Qian Liuchun Zheng Bao-Lian Su Hong-En Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China Beijing National Laboratory of Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Hunan Provincial Key Laboratory of Chemical Power Resources College of Chemistry and Chemical Engineering Central South University Changsha 410083 Hunan China Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China College of Physics and Electronics Information Yunnan Normal University Kunming 650500 Yunnan China

Lithium-sulfur batteries (LSBs) hold great potential for large-scale electrochemical energy storage ***,the shuttle of soluble lithium polysulfide (LiPSs) intermediates with sluggish conversion kinetics and random deposition of Li2S have severely degraded the capacity,rate and cycling performances of LSBs,preventing their practical *** this work,ultrathin MoSe2 nanosheets with active edge sites were successfully grown on both internal and external surfaces of hollow carbon spheres with mesoporous walls (MCHS).The resulting MoSe2@MCHS composite acted as a novel functional reservoir for LiPSs with high chemical affinity and effectively mediated their fast redox conversion during charge/discharge as elucidated by experimental observations and first-principles density functional theory (DFT) *** as-fabricated Li-S cells delivered high capacity,superior rate and excellent *** current work presents new insights on the delicate design and fabrication of novel functional composite electrode materials for rechargeable batteries with emerging applications.

关键词： MoSe2 Cathode host Lithium-sulfur batteries Shuttle effect Electrochemistry Density functional theory

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Interfacial Sulfur-Sensitization of PtNi Nanoalloy for Efficient Electrocatalytic Hydrogen Production in Alkaline Simulated Seawater

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Chemistry of materials 2023年第20期35卷 8529-8539页

作者： Fei Yu Yu-Xuan Xiao Jiang-Bo Chen Ge Tian Xiong Yang Fu-Fei Pu Jin-Yi Ouyang Kenneth I. Ozoemena Mark D. Symes Roberto M. Torresi Fazhou Wang Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & State Key Laboratory of Silicate Materials for Architectures & Shenzhen Research Institute School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai 519082 China Molecular Sciences Institute School of Chemistry University of the Witwatersrand Johannesburg 2050 South Africa WestCHEM School of Chemistry University of Glasgow Glasgow G12 8QQ United Kingdom Departamento de Química Fundamental Instituto de Química Universidade de São Paulo Av. Lineu Prestes 748 São Paulo 05508000 Brazil

Optimization of the electronic structure and surface physicochemical properties of PtNi nanoalloys by incorporation of sulfur (S) is an effective strategy for improving the efficiency of the electrocatalytic hydrogen evolution reaction (HER). However, few studies have been carried out to assess the seawater electrocatalytic performance of PtNi by incorporation of interfacial S from CdS nanocrystals. In this study, a simple method is developed to prepare CdS/PtNi, composed of a PtNi alloy supported with CdS quantum dots (QDs). Experimental data demonstrate that interfacial S-sensitization enhances the electron density of PtNi nanoalloy in CdS/PtNi. Therefore, CdS/PtNi exhibits superior performance toward HER in seawater. Specifically, CdS/PtNi displays a low overpotential of 22 mV at a current density of 10 mA cm–2, a higher specific activity of 24.7 mA cm–2at −0.07 V, and superior durability in seawater, all of which metrics exceed those of commercial Pt/C. Theoretical calculations provide additional evidence that interfacial S-sensitization of PtNi alloy raises electron densities, lowers the d-band center, facilitates water molecule adsorption, resistances to Cl–, and reduces the hydrogen adsorption Gibbs free energy of PtNi alloy. This study provides new opportunities for the design of efficient and stable electrocatalysts for large-scale production of hydrogen from seawater.

关键词： Alloys Cadmium sulfide Evolution reactions Platinum Seawater

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

arXiv

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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 controllable 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

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Research on the Bonding Properties of Vitrified Bonds with Porous Diamonds and the Grinding Performance of Porous Diamond Abrasive Tools

Research Square

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Research Square 2021年

作者： Li, Jianwei Fang, Wenjun Wan, Long Liu, Xiaopan Hu, Weida Cao, Dan Han, Kai Li, Yingying Yan, Yonggao Hunan University College of Materials Science and Engineering China Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body China Hunan University of Technology Liling ceramic institute China Shangqiu Institute of Technology China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology China

Ordinary diamond presents the disadvantages of poor self-sharpening and concentrated grinding stress when it is used as an abrasive. Moreover, this kind of diamond cannot be well wetted by the vitrified bond, resulting in a lower holding force of the binder to the abrasives (i.e., the diamond is easy to detach from the binder matrix during grinding). These comprehensive factors not only reduce the surface quality of the processed workpiece, but also hinder the processing efficiency. In order to solve these problems, a new type of porous diamond with high self-sharpening properties was prepared using a thermochemical corrosion method in this study. Our results showed a great improvement in pore volume and specifisurface area of the porous diamond compared with ordinary diamond abrasive particles, and the holding force and wettability of vitrified bond to the porous diamond abrasive particles were also improved. Compared with ordinary diamond abrasive tools, porous diamond abrasive tools showed a 29.6% increase in grinding efficiency, a 15.5% decreased in grinding ratio, a 27.5% reduction in workpiece surface roughness, and the scratches on the silicon wafer surface were reduced and refined. © 2021, CC BY.

关键词： Grinding (machining)

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