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Surface electron doping induced double gap opening in T_(d)-WTe_(2)

Chinese Physics B 2022年第6期31卷 620-624页

作者： Qi-Yuan Li Yang-Yang Lv Yong-Jie Xu Li Zhu Wei-Min Zhao Yanbin Chen Shao-Chun Li National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China School of Physics Nanjing UniversityNanjing 210093China Department of Materials Science and Engineering Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Jiangsu Provincial Key Laboratory for Nanotechnology Nanjing UniversityNanjing 210093China

By using scanning tunneling microscopy,we investigated the electronic evolution of T_(d)-WTe_(2) via in-situ surface alkali K atoms *** T_(d)-WTe_(2) surface is electron doped upon K deposition,and as the K coverage increases,two gaps are sequentially opened near Fermi energy,which probably indicates that two phase transitions concomitantly occur during electron *** two gaps both show a dome-like dependence on the K *** the bigger gap shows no prominent dependence on the magnetic field,the smaller one can be well suppressed and thus possibly corresponds to the superconducting *** work indicates that T_(d)-WTe_(2) exhibits rich quantum states closely related to the carrier concentration.

关键词： scanning tunneling microscopy T_(d)-WTe_(2) surface electron doping superconductivity transition

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Glycerol Electrooxidation over Precision-Synthesized Gold Nanocrystals with Different Surface Facets

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Precision Chemistry 2024年第3期2卷 103-111页

作者： Hansen Mou Fang Lu Zechao Zhuang Qiaowan Chang Lihua Zhang Xiaobo Chen Yugang Zhang Jingguang G.Chen Department of Chemical Engineering Columbia UniversityNew YorkNew York 10027United States School of Chemical Engineering and Bioengineering Washington State UniversityPullmanWashington 99164United States Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNew York 11973United States Materials Science and Engineering Program State University of New York at BinghamtonBinghamtonNew York 13902United States Chemistry Division Brookhaven National LaboratoryUptonNew York 11973United States

Electrochemical glycerol oxidation(EGO)emerges as a promising route to valorize glycerol,an underutilized byproduct from biodiesel production,into value-added *** study employed three types of gold(Au)nanocrystals with controlled shapes to elucidate the facet-dependent electrocatalytic behavior in ***,rhombic dodecahedral,and cubic Au nanocrystals with{111},{110},and{100}facets,respectively,were precisely synthesized with uniform size and *** dodecahedra exhibited the lowest onset potential for EGO due to facile AuOH formation,while octahedra showed enhanced electrochemical activity for glycerol oxidation and resistance to ***-situ FTIR analysis revealed that Au{111}surfaces selectively favored C_(2) products,whereas Au{100}surfaces promoted C_(3) product formation,highlighting the significant effect of facet orientation on EGO performance and informing catalyst design.

关键词： Electrochemical glycerol oxidation Precision synthesis Shaped nanocrystals Au nanocrystals SAXS In-situ FTIR

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Enabling Superior Sodium Capture for Efficient Water Desalination by a Cornstalk-Derived Porous Carbon Decorated with Nickel Hexacyanoferrate

SSRN

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SSRN 2024年

作者： Wang, Shuyu Zhang, Li Zhao, Cuijiao Liu, Guoqiang Zhou, Hongjian Dai, Weiji Zhang, Yudong Cui, Can Huang, Saifang School of Materials Science and Engineering Jiangsu University of Science and Technology Zhenjiang212003 China School of Materials Science and Engineering Anhui Province Key Laboratory of Efficient Conversion and Solid-State Storage of Hydrogen & Electricity Anhui University of Technology Maanshan243002 China Key Laboratory of Materials Physics Centre for Environmental and Energy Nanomaterials Anhui Key Laboratory of Nanomaterials and Nanotechnology CAS Center for Excellence in Nanoscience Institute of Solid State Physics Chinese Academy of Sciences Hefei230031 China

Designing stable and high-capacity electrode materials is essential for enhancing the effectiveness of hybrid capacitive deionization (HCDI) in desalinating water. In this study, nickel hexacyanoferrate (NiHCF) nanoparticles were developed in situ on 3D porous carbon (PC) derived from cornstalks (NiHCF/PC) through a co-precipitation method. This composite material improves conductivity, offers abundant redox active sites, ensures a stable structure, and facilitates ion diffusion during Na+ ion insertion/extraction, rendering its great potential for the water desalination application via the HCDI technique. The NiHCF/PC-1 electrode exhibits a notable specific surface area of 1159.8 m2g−1 and interconnects hierarchically porous channels, enhancing electrochemical capabilities with the capacitance retention of NiHCF/PC-1 remains around 99.68% even after 1000 cycles. Utilizing an HCDI unit with an ammoniated activated carbon (A-AC) anode and a NiHCF/PC-1 cathode without the need for an ion-exchange membrane, the NiHCF/PC-1 electrode exhibits an impressive salt adsorption capacity (SAC) of 39.33 mg g−1 and outstanding cycle stability (retention rate of 96.49%). XRD and XPS results reveals that the change in element valence within the NiHCF/PC-1 electrode before and after desalination experiments, specifically the reduction of Fe3+ into Fe2+, plays a crucial role in enhancing Na+ ion insertion. This study opens avenues for crafting 3D Faradaic electrode materials as promising candidates for environmentally friendly and sustainable water purification, particularly for the removal of ions in brackish and saline waters. © 2024, The Authors. All rights reserved.

关键词： Ion exchange

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Search for Lithium Ion Conducting Oxides Using the Predicted Ionic Conductivity by Machine Learning

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2022年第3期69卷 108-116页

作者： Iwamizu, Yudai Suzuki, Kota Matsui, Naoki Hirayama, Masaaki Kanno, Ryoji Department of Chemical Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama226-8502 Japan Research Center for All-Solid-State Battery Institute of Innovative Research Tokyo Institute of Technology 4259 Nagatsuta-cho Midori-ku Yokohama226-8502 Japan

A machine learning method was developed, which predicts ionic conductivity based on chemical composition alone, aiming to develop an efficient method to search for lithium conductive oxides. Under the obtained guideline, the material search was focused on the Li2O-SiO2-MoO3 pseudo-ternary phase diagram, which is predicted to have high ionic conductivity (>10-4 S•cm-1). We investigated the formation range, ionic conductivity, and crystal structure of the lithium superionic conductor (LISICON) solid solution on the Li4SiO4-Li2MoO4 tie line. The ionic conductivity of the LISICON phases is about 10-7 S•cm-1, which is higher than that of the end members;however, two orders of magnitude lower than that of the analogous LISICON materials. In addition, the experimental values were two or three orders of magnitude lower than the predicted conductivity values by machine learning. The crystal structure analysis revealed that the distance between the lithium sites and the occupancy of each lithium site in the crystal structure contributed to the decrease in ionic conductivity. This strong correlation between crystal structure and ionic conductivity was one of the reasons for the discrepancy between the predicted ionic conductivity based on chemical composition alone and the experimental value. © 2022 Japan Society of Powder and Powder Metallurgy.

关键词： solid electrolytes

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Tribological properties of M0S_(2) coating for ultra-long wear-life and low coefficient of friction combined with additive g-C3N4 in air

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Friction 2021年第4期9卷 789-801页

作者： Yupeng ZHANG Panpan LI Li JI Xiaohong LIU Hongqi WAN Lei CHEN Hongxuan LI Zhiiiang JIN State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Chemistry and Chemical Engineering North Minzu UniversityYinchuan 750021China

The solid lubricant M0S_(2) demonstrates excellent lubricating properties,but it spontaneously oxidizes and absorbs moisture in air,and thus results in poor wear resistance and short *** this study,the additive g-C_(3)N_(4)(CN)was successfully combined with M0S_(2) via hydrothermal synthesis as a solid lubricant for the first ***,a low friction coefficient(COF,y=0.031)and ultra-long wear-life of CN/M0S_(2) compared to pure M0S_(2) in air were *** functional groups and good crystallinity of the lubricant material were characterized via Fourier transform infrared(FTIR)spectroscopy and X-ray diffraction(XRD).The formed valence states in CN/M0S_(2) were analyzed via X-ray photoelectron spectroscopy(XPS).The characterized results of the scanning electron microscopy(SEM)and high-resolution transmission electron microscopy(HRTEM)show the morphology and interior crystal phase structure of CN/M0S_(2).From the cross-section analysis,the presence of iron oxide nanoparticles lubricating film is synergistic with CN/M0S_(2) film during the friction process,resulting in its ultra-long *** particular,the friction mechanism of interlayer sliding friction combined with energy storage friction was analyzed and proposed.

关键词： solid lubricant CN/M0S2 friction coefficient(COF) wear-life

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Mn_(x)Cr_(0.3)Fe_(0.5)Co_(0.2)Ni_(0.5)Al_(0.3)high entropy alloys for magnetocaloric refrigeration near room temperature

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Journal of materials science & Technology 2021年第20期79卷 15-20页

作者： Zhihua Dong Shuo Huang Valter Ström Guocai Chai Lajos Károly Varga Olle Eriksson Levente Vitos Applied Materials Physics Department of Materials Science and EngineeringKTH-Royal Institute of TechnologyStockholm SE-10044Sweden College of Materials Science and Engineering Chongqing UniversityChongqing 400030China Department of Physics and Astronomy Division of Materials TheoryUppsala UniversityUppsala SE-75121Sweden Department of Materials Science and Engineering KTH-Royal Institute of TechnologyStockholm SE-10044Sweden Division of Engineering Materials Department of Management and EngineeringLinköping UniversityLinköping SE-58183Sweden AB Sandvik Materials Technology R&D Center Sandviken SE-81181Sweden School of Science and Technology Örebro UniversityÖrebro SE-70281Sweden Research Institute for Solid State Physics and Optics Wigner Research Center for PhysicsP.O.Box 49H-1525 BudapestHungary

High entropy alloys(HEAs)based on transition metals display rich magnetic characteristics,however attempts on their application in energy efficient technologies remain ***,we explore the magnetocaloric application for... 详细信息

关键词： High entropy alloys Magnetocaloric materials Magnetic phase transition Experiment and Ab initio

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Pressure-Optimized Band Gap and Enhanced Photoelectric Response of Graphitic Carbon Nitride with Nitrogen Vacancies

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Physical Review Applied 2023年第2期19卷 024048-024048页

作者： Peng Cheng Deyuan Yao Jinwei Yan Tingting Ye Huanhuan Liu Hong Zeng Xiaomei Pan Genqiang Zhang Junfeng Ding Key Laboratory of Materials Physics Institute of Solid State Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei 230031 China Science Island Branch Graduate School of USTC Hefei 230026 China CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China Jianghuai Frontier Technology Coordination and Innovation Center Hefei 230088 China

Graphitic carbon nitride (g-C3N4) shows favorable performance as a photocatalyst and has attracted widespread attention in recent years. As its wide band gap of 2.70 eV limits light absorption in the visible range, many efforts have been made to optimize the band gap. In this report, pressure is used to engineer the band gap and photoelectric response of nitrogen-deficient g-C3N4 nanoflakes. The band gap of the sample is first narrowed to 2.40 eV due to the introduction of nitrogen vacancies and then further narrowed to 1.70 eV by pressure, which is the lowest value reported in the literature for undoped g-C3N4. Accordingly, the photoelectric response increases by nearly 50% because of the enhanced light absorption at high pressure. More interestingly, after depressurization to ambient pressure, the optimized band gap survives with a minimum value of 1.87 eV accompanied by enhanced photoelectric responsivity. In situ synchrotron x-ray diffraction and Raman spectra suggest that the tunable band gap originates from irreversible pressure-induced amorphization with the assistance of vacancies for g-C3N4. The collaborative approach of introducing deficiency and pressure treatment adopted here shows the ability to engineer the band gap continuously over a prominently wider region than that for the single band-gap-narrowing technique, and thus, enhances the photoelectric performance for broadened semiconductors.

关键词： Band gap Energy conversion technologies Photocatalysis Vacancies Amorphous semiconductors Carbon-based materials Nitrides Pressure techniques

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Tunable Ferroelectric Polarization in BaTiO3 Coupled with Zn0.5Cd0.5S Quantum Dots for Efficient Solar-Driven Hydrogen Evolution

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Advanced Energy materials 2025年第0期

作者： Pan, Changyuan Huang, Kaige Zhi, Zhenhua Yang, Ying Zhang, Huimin Xie, Yufang Zhang, Chenglin Liu, Yuan Chen, Mingming Wang, Zhijie Jiang, Zhifeng Cao, Dawei School of Physics and Electronic Engineering Institute for Energy Research Jiangsu University Zhenjiang212013 China Laboratory of Solid-State Optoelectronics Information Technology Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

Integrating ferroelectric materials with semiconductor photocatalysts offers a groundbreaking strategy to enhance solar-driven hydrogen production by improving charge separation and transfer efficiency. Herein, a synergistic system is developed by coupling the tunable ferroelectric polarization of BaTiO3 (BTO) with a Z-scheme heterojunction in Zn0.5Cd0.5S quantum dots (ZCS QDs). The strong and adjustable built-in electric field generated by BTO effectively drives carrier separation, enhances interfacial band bending, and mitigates the excitonic effects commonly observed in QDs, facilitating directional charge transfer. Mechanistic insights, validated by in situ X-ray photoelectron spectroscopy (XPS) and Kelvin Probe Force Microscopy (KPFM), highlight the pivotal role of ferroelectric polarization in modulating carrier dynamics and interfacial interactions. These attributes, resulting from the synergistic effects of ferroelectric polarization and the Z-scheme heterojunction, enable the ZCS QDs/BTO composite to achieve an outstanding hydrogen evolution rate of 0.83 mmol g−1 h−1, surpassing pure BTO and ZCS QDs by factors of 20.8 and 1.7, respectively. Notably, external polarization further amplifies hydrogen production to 1.19 mmol g−1 h−1, representing a remarkable 143% increase compared to the pristine system and showcasing the pivotal role of polarization-enhanced built-in electric fields in photocatalysis. This work presents a novel pathway for designing advanced photocatalysts, providing promising prospects for sustainable hydrogen production. © 2025 Wiley-VCH GmbH.

关键词： Heterojunctions

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Multifunctional Polyurethane Exhibiting High Mechanical Performance and Shape-Memory-Assisted Self-Healing

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Small 2025年第21期21卷 e2500847页

作者： Wang, Xiaoyue Li, Song Yang, Zenghui Zhang, Yaoming Wang, Qihua Wang, Tingmei Zhang, Xinrui State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China The Tribology Science Fund of State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

Polymeric materials often face inherent trade-offs between mechanical performance and self-healing capabilities, which presents significant challenges to their development and practical application. Here, an effective strategy is reported to overcome these limitations. By introducing a highly crystalline polyol—characterized by its chain folding and storage chain length—and coordination bonds into polyurethane, an exceptional balance of high tensile strength (47.18 ± 2.35 MPa), exceptional elongation at break (5952.72 ± 254.20%), outstanding toughness (1396.39 ± 90.05 MJ m−3), and high hardness (shore D hardness 43.8 ± 0.8) is achieved, while also maintaining intrinsic self-healing properties. The material's self-healing is facilitated by the water solubility of polyol (polyethylene glycol, PEG), which enables rapid healing and welding at low temperatures (4 °C) with the aid of water. Additionally, the shape-memory recovery force further enhances crack closure and healing, contributing to the material's durability. This unique combination of mechanical performance and self-healing capabilities underscores the potential of this material for advanced applications that require both high mechanical properties and robust self-healing functionality. © 2025 Wiley-VCH GmbH.

关键词： Tensile strength

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Catalytic conversion of lignocellulosic biomass into chemicals and fuels

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Green Energy & Environment 2023年第1期8卷 10-114页

作者： Weiping Deng Yunchao Feng Jie Fu Haiwei Guo Yong Guo Buxing Han Zhicheng Jiang Lingzhao Kong Changzhi Li Haichao Liu Phuc T.T.Nguyen Puning Ren Feng Wang Shuai Wang Yanqin Wang Ye Wang Sie Shing Wong Kai Yan Ning Yan Xiaofei Yang Yuanbao Zhang Zhanrong Zhang Xianhai Zeng Hui Zhou State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsNational Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Estersand College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass Xiamen Key Laboratory of High-valued Utilization of BiomassCollege of EnergyXiamen University361102China Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou310027China Institute of Zhejiang University-Quzhou 78 Jiuhua Boulevard NorthQuzhou324000China School of Energy and Environmental Engineering Hebei University of TechnologyTianjin300401China Shanghai Key Laboratory of Functional Materials Chemistry Research Institute of Industrial CatalysisSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai200237China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Colloid and Interface and ThermodynamicsCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190China Department of Biomass Science and Engineering Sichuan UniversityChengdu610065China CAS Key Laboratory of Low-carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai201210China University of Chinese Academy of Sciences Beijing100049China CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China Department of Chemical and Biomolecular Engineering National University of Singapore4 Engineering Drive 4Singapore117585Singapore Sta

In the search of alternative resources to make commodity chemicals and transportation fuels for a low carbon future,lignocellulosic biomass with over 180-billion-ton annual production rate has been identified as a promising *** review focuses on the state-of-the-art catalytic transformation of lignocellulosic biomass into value-added chemicals and *** a brief introduction on the structure,major resources and pretreatment methods of lignocellulosic biomass,the catalytic conversion of three main components,i.e.,cellulose,hemicellulose and lignin,into various compounds are comprehensively *** in separate steps or in one-pot,cellulose and hemicellulose are hydrolyzed into sugars and upgraded into oxygen-containing chemicals such as 5-HMF,furfural,polyols,and organic acids,or even nitrogen-containing chemicals such as amino *** the other hand,lignin is first depolymerized into phenols,catechols,guaiacols,aldehydes and ketones,and then further transformed into hydrocarbon fuels,bioplastic precursors and bioactive *** review then introduces the transformations of whole biomass via catalytic gasification,catalytic pyrolysis,as well as emerging ***,opportunities,challenges and prospective of woody biomass valorization are highlighted.

关键词： Lignocelullose Biomass Catalytic conversion Biofuels Renewable chemicals

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