检索结果-内蒙古大学图书馆

Conductance asymmetry in proximitized magnetic topological insulator junctions with Majorana modes

physical Review B 2023年第3期108卷 035424-035424页

作者： Daniele Di Miceli Eduárd Zsurka Julian Legendre Kristof Moors Thomas L. Schmidt Llorenç Serra Institute for Cross-Disciplinary Physics and Complex Systems (CSIC-UIB) 07122 Palma Spain Department of Physics and Materials Science University of Luxembourg 1511 Luxembourg Luxembourg Peter Grünberg Institute (PGI-9) Forschungszentrum Jülich 52425 Jülich Germany JARA-Fundamentals of Future Information Technology Jülich-Aachen Research Alliance Forschungszentrum Jülich and RWTH Aachen University 52425 Jülich Germany School of Chemical and Physical Sciences Victoria University of Wellington P.O. Box 600 Wellington 6140 New Zealand Department of Physics University of the Balearic Islands 07122 Palma Spain

We theoretically discuss electronic transport via Majorana states in magnetic topological insulator-superconductor junctions with an asymmetric split of the applied bias voltage. We study normal-superconductor-normal (NSN) junctions made of narrow (wirelike) or wide (filmlike) magnetic topological insulator slabs with a central proximitized superconducting sector. The occurrence of charge-nonconserving Andreev processes entails a nonzero conductance related to an electric current flowing to ground from the proximitized sector of the NSN junction. We show that topologically protected Majorana modes require an antisymmetry of this conductance with respect to the point of equally split bias voltage across the junction.

关键词： Andreev reflection Edge states Electrical conductivity Quantum phase transitions Quasiparticles & collective excitations Topological insulators Topological superconductors

来源：评论

学校读者我要写书评

暂无评论

Coexistence of zero-, one-, and two-dimensional degeneracy in tetragonal SnO2 phonons

引用

physical Review B 2021年第4期104卷 L041107-L041107页

作者： Jianhua Wang Hongkuan Yuan Minquan Kuang Tie Yang Zhi-Ming Yu Zeying Zhang Xiaotian Wang School of Physical Science and Technology Southwest University Chongqing 400715 China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 China

Based on the dimension of degeneracy, topological electronic systems can roughly be divided into three parts: nodal point, line, and surface materials corresponding to zero-, one-, and two-dimensional degeneracy, respectively. In parallel to electronic systems, the concept of topology was extended to phonons, promoting the birth of topological phonons. Till date, few nodal point, line, and surface phonon candidates have been predicted in solid-state materials. In this study, based on symmetry analysis and first-principles calculation, we prove that zero-, one-, and two-dimensional degeneracy co-exist in the phonon dispersion of one single realistic solid-state material SnO2 with P42/mnm structure. In contrast to the previously reported electronic systems, the topological phonons observed in SnO2 are not restricted by the Pauli exclusion principle, and they experience negligible spin-orbit coupling effect. Hence, SnO2 with multiple dimensions of degeneracy phonons is a good platform for studying the entanglement among nodal point, line, and surface phonons. Moreover, obvious phonon surface states are visible, which is beneficial for experimental detection.

关键词： First-principles calculations Topological materials Density functional theory k dot p method

来源：评论

学校读者我要写书评

暂无评论

Metal-organic-framework-derived formation of Co–N-doped carbon materials for efficient oxygen reduction reaction

引用

Journal of Energy Chemistry 2020年第1期29卷 137-143,I0005页

作者： Hao Tian Chi Zhang Panpan Su Zhangfeng Shen Hao Liu Guoxiu Wang Shaomin Liu Jian Liu State Key Laboratory of Catalysis iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Department of Chemical Engineering Curtin UniversityPerthWA 6845Australia Centre for Clean Energy Technology School of Mathematical and Physical SciencesFaculty of ScienceUniversity of Technology SydneyBroadwaySydneyNSW 2007Australia Joint International Laboratory on Environmental and Energy Frontier Materials School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China DICP-Surrey Joint Centre for Future Materials Department of Chemical and Process Engineeringand Advanced Technology InstituteUniversity of SurreyGuilfordSurrey GU27XHUK State Key Laboratory of Catalysis iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023 LiaoningChina

Non-precious metal nitrogen-doped carbonaceous materials have attracted tremendous attention in the field of electrochemical energy storage and ***,we report the designed synthesis of a novel series of Co-N-C nanocomposites and their evaluation of electrochemical *** yolkshell structured Co nanoparticles@polymer materials are fabricated from the facile coating polymer strategy on the surface of *** calcination in nitrogen atmosphere,the Co–N–C nanocomposites in which cobalt metal nanoparticles are embedded in the highly porous and graphitic carbon matrix are successfully *** cobalt nanoparticles containing cobalt metal crystallites with an oxidized shell and/or smaller(or amorphous)cobalt-oxide deposits appear on the surface of graphitic *** prepared Co–N–C nanoparticles showed favorable electrocatalytic activity for oxygen reduction reactions,which is attributed to its high graphitic degree,large surface area and the large amount existence of Co–N active sites.

关键词： Metal-organic-framework Resin polymer Oxygen reduction reaction Electrocatalysts

来源：评论

学校读者我要写书评

暂无评论

Revealing the Effect of Air-Annealing On Structural, Morphological and Supercapacitive Properties of the 2d-Biocl Nanosheets

SSRN

引用

SSRN 2024年

作者： Ghule, Balaji Gautam Suryawanshi, Rushikesh Rameshrao Shinde, Nanasaheb M. Jadhav, Vijaykumar V. Narwade, Sandesh H. Raut, Pratik Prakashrao Jadhav, Gitanjali Fulchand Mane, Rajaram Sakharam Centre for Nanomaterials & Energy Devices School of Physical Sciences Swami Ramanand Teertha Marathwada University M.S. Nanded431606 India School of Energy and Chemical Engineering Ulsan National Institute of Science of Technology Ulsan44919 Korea Republic of Department of Chemical Engineering Dong-A University 37 Nakdong-Daero 550beon-gil Saha-gu Busan49315 Korea Republic of Department of Physics Shivaji Mahavidyalaya Maharashtra Udgir413517 India

Upright standing nanosheets of bismuth oxychloride (BiOCl), synthesized via a facile chemical synthesis method and air-annealed from 50 to 600 oC temperatures (named as BOC-50-600), are envisaged as electrochemical supercapacitor electrodes. These electrodes are initially screened for their surface morphology, elemental configuration, phase purity, and binding energy by various means. Due to changes in the surface morphology, phase, charge transfer resistance, and binding energy, the one annealed at 150 oC i.e., BOC-150 has offered targeted supercapacitive performance due to quasi-faradaic redox reactions in 6 M KOH electrolyte solution. The specific capacitance of the BOC-150 electrode measured at 1.40–5.0 A/g current densities is varied from 264.6 to 95 F/g. The as-assembled BOC-150//BOC-150 symmetric supercapacitor device (SSD) demonstrates an efficient supercapacitive performance with a maximum 100.95 Wh/kg energy density and 2160.19 W/kg power density. Additionally, the as-designed SSD endows an admirable capacity retention of 92% for 2000 charge-discharge cycles, approving moderate chemical stability and considerable mechanical robustness for using in commercial electronic items. © 2024, The Authors. All rights reserved.

关键词： Supercapacitor

来源：评论

学校读者我要写书评

暂无评论

The emergence of single-atom-layer catalysis

Materials Today Catalysis

引用

Materials Today Catalysis 2023年 1卷

作者： Ma, Mingyu Gong, Chengshi An, Xiuyun Shi, Zude Liu, Zheng He, Yongmin Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education School of Physical Science & Technology Lanzhou University Lanzhou730000 China State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha410082 China School of Electronic and Information Engineering Lanzhou City University No. 11 Jiefang Road Anning District Lanzhou China Department of Mathematics and Physics Luoyang Institute of Science and Technology Luoyang471023 China School of Materials Science and Engineering Nanyang Technological University Singapore639798 Singapore

To improve the utilization efficiency of noble metals as well as lower their mass loading in electrocatalysis, the research community has contributed significant efforts to nanostructure noble metal catalysts in various dimensions during recent decades, such as porous structures (3D), nanosheets (2D), nanowires (1D), nanoclusters (0D), and individual atoms (i.e., single-atom catalyst). Recently, with the development of the well-controlled synthesis of atom-thin materials (e.g., the noble metal layer or two-dimensional materials), a new type of catalyst defined as the single-atom-layer catalyst, has emerged, allowing nearly all the atoms at the monolayer to be accessible to catalytic reactions. In this perspective, we first introduced the unique properties of this catalyst and distinguished it from current single-atom catalysts, then highlighted its recent theoretical and experimental progress, and finally discussed critical challenges toward catalytic applications. © 2023 The Authors

关键词： Precious metals

来源：评论

学校读者我要写书评

暂无评论

Widely Tunable Berry Curvature in the Magnetic Semimetal Cr1+δTe2

引用

Advanced Materials 2023年第12期35卷

作者： Fujisawa, Yuita Pardo-Almanza, Markel Hsu, Chia-Hsiu Mohamed, Atwa Yamagami, Kohei Krishnadas, Anjana Chang, Guoqing Chuang, Feng-Chuan Khoo, Khoong Hong Zang, Jiadong Soumyanarayanan, Anjan Okada, Yoshinori Okinawa904-0495 Japan Department of Physics National Sun Yat-sen University Kaohsiung80424 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Center for Theoretical and Computational Physics National Sun Yat-sen University Kaohsiung80424 Taiwan Institute of High Performance Computing Agency for Science Technology and Research Singapore138632 Singapore Department of Physics and Astronomy University of New Hampshire DurhamNH 03824 United States Materials Science Program University of New Hampshire DurhamNH 03824 United States Department of Physics National University of Singapore Singapore117551 Singapore Institute of Materials Research and Engineering Agency for Science Technology and Research Singapore138634 Singapore

Magnetic semimetals have increasingly emerged as lucrative platforms hosting spin-based topological phenomena in real and momentum spaces. Cr1+δTe2 is a self-intercalated magnetic transition metal dichalcogenide (TMD), which exhibits topological magnetism and tunable electron filling. While recent studies have explored real-space Berry curvature effects, similar considerations of momentum-space Berry curvature are lacking. Here, the electronic structure and transport properties of epitaxial Cr1+δTe2 thin films are systematically investigated over a range of doping, δ (0.33 – 0.71). Spectroscopic experiments reveal the presence of a characteristic semi-metallic band region, which shows a rigid like energy shift with δ. Transport experiments show that the intrinsic component of the anomalous Hall effect (AHE) is sizable and undergoes a sign flip across δ. Finally, density functional theory calculations establish a link between the doping evolution of the band structure and AHE: the AHE sign flip is shown to emerge from the sign change of the Berry curvature, as the semi-metallic band region crosses the Fermi energy. These findings underscore the increasing relevance of momentum-space Berry curvature in magnetic TMDs and provide a unique platform for intertwining topological physics in real and momentum spaces. © 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.

关键词： Density functional theory

来源：评论

学校读者我要写书评

暂无评论

Interfacial molecular anchor for ambient all-bladed perovskite solar modules

引用

Joule 2025年第5期9卷

作者： Zhu, Xuejie Yu, Dongqi Zhou, Xin Wang, Nan Liu, Hong Liang, Zihui Wu, Congcong Wang, Kai Jin, Dayong Liu, Shengzhong Yang, Dong State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Dalian116023 China School of Physics and Electronic Technology Liaoning Normal University Dalian116029 China Interdisciplinary Research Center for Biology and Chemistry Liaoning Normal University Liaoning Dalian116029 China Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Key Laboratory of Polymer Materials School of Materials Science and Engineering Hubei University Wuhan430062 China National Local Joint Laboratory for Advanced Textile Processing and Clean Production Wuhan Textile University Wuhan430073 China Huanjiang Laboratory Zhejiang University Zhuji311800 China School of Mathematical and Physical Sciences Faculty of Science University of Technology Sydney SydneyNSW Australia Eastern Institute for Advanced Study Eastern Institute of Technology Ningbo China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

Ambient blade coating of perovskite solar modules shows great potential for large-scale manufacture and commercialization. However, blade coating nanometer-thick buffer layers typically results in a nonuniform surface due to particle instability and aggregation, often leading to insufficient integration and destabilization of the crystallographic lattice in the overlying perovskite layer. Herein, we introduce a layer of "molecular glue" that can effectively anchor the solute that suspends the monodisperse SnO2 nanoparticles into a uniform thin film and adhere it to the top perovskite during the mechanical blading process. Leveraging this holistic nanoparticle-anchoring strategy, we have achieved a seamlessly bonded cathode heterojunction, resulting in a record efficiency of 26.11% for small cells and the highest efficiency so far of 22.76% (certified at 21.60%) for mini-modules. Importantly, these ambiently all-blade-coated devices exhibit an extended lifetime of approximately 1,500 h, as verified by ISOS-O testing, indicating great promise for commercialization. © 2025

关键词： Perovskite

来源：评论

学校读者我要写书评

暂无评论

Scalable and shapable nacre-like ceramic-metal composites based on deformable microspheres

引用

National science Review 2025年第3期 338-346页

作者： Yu-Jie Lu Xiang-Sen Meng Qiu-An Sun Jie Wang Jun-Jie Song Peng-Fei Wang Guo-Rui Wang Cheng-Xin Yu Yong-Sheng Zhang Li-Bo Mao Shu-Hong Yu Department of Chemistry New Cornerstone Science Laboratory Institute of Biomimetic Materials & Chemistry Anhui Engineering Laboratory of Biomimetic Materials Division of Nanomaterials & Chemistry Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Department of Modern Mechanics CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Institute of Innovative Materials Department of Materials Science and Engineering Department of Chemistry Southern University of Science and Technology

Natural nacre that consists of brittle minerals and weak organics exhibits a high fracture toughness while retaining a high strength. The exceptional mechanical performance of nacre is attributed to its hierarchical structure like a ‘brick-and-mortar' structure, which has inspired the development of tough ceramic-based composites. However, the practical applications of biomimetic structural ceramics are hindered by limited material size, fabrication efficiency and flexibility of being molded into various shapes. We herein report the fabrication of nacre-like ceramic-metal composites based on deformable alumina microspheres coated with nickel salt. Green bodies are produced by assembling the composite microspheres in molds with different shapes. During the hot-pressing sintering of the green bodies, the microspheres are flattened into platelets under pressure and fill up the entire space without visible voids. The aligned platelets are separated by nickel that is reduced from the nickel salt on their surface, constituting a typical ‘brick-and-mortar' structure. By tuning the microsphere sizes, the microstructures of the composites can be optimized to obtain a high flexural strength（386 MPa at room temperature and 286.86 MPa at 600°C） and a high fracture toughness(12.76 MPa·m1/2at room temperature and 12.99 MPa·m1/2at 600°C) simultaneously. This strategy opens a promising avenue for the feasible mass production and all-in-one molding of nacre-like ceramic-metal composites with various shapes, sizes and raw materials.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Interface engineering of snow-like Ru/RuO2 nanosheets for boosting hydrogen electrocatalysis

引用

science Bulletin 2022年第20期67卷 2103-2111,M0004页

作者： Juntao Zhang Guomian Ren Deyu Li Qingyu Kong Zhiwei Hu Yong Xu Suling Wang Lu Wang Maofeng Cao Xiaoqing Huang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Institute of Functional Nano&Soft Materials Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China SociétéCivile Synchrotron SOLEIL L'Orme des MerisiersSaint-Aubin 91192France School of Physics Science and Information Engineering Shandong Key Laboratory of Optical Communication Science and TechnologyLiaocheng UniversityLiaocheng 252059China Max Planck Institute for Chemical Physics of Solids Dresden 01187Germany

Ru has recently been regarded as a promising catalyst for hydrogen oxidation reaction(HOR) and hydrogen evolution reaction(HER) due to its similar binding energy towards *H but lower price compared to ***, the quest of high-efficiency Ru-based catalysts for HOR and HER is driven by the current disadvantages including low activity and unsatisfactory stability. Herein, we have fabricated and engineered two-dimensional(2D) Ru-based snow-like nanosheets with Ru/Ru O2interface(Ru/Ru O2SNSs)via a post-annealing treatment. Detailed characterizations and theoretical calculations indicate that the interfacial synergy, which is dependent on the temperature for annealing, can alter the hydrogen binding energy(HBE) and hydroxide binding energy(OHBE), as a result of the enhanced HOR and HER performance. Impressively, the optimal Ru/RuO_(2) SNSs display a mass activity of 9.13 A mgRu^(–1) at an overpotential of 50 m V in 0.1 mol L^(–1) KOH for HOR, which is 65, 304, and 21 times higher than those of Ru SNSs(0.14 A mg_(Ru)^(–1)), RuO_(2) SNSs(0.03 A mg_(Ru)^(–1)), and commercial Pt/C(0.43 A mg_(Ru)^(–1)), ***, Ru/RuO_(2) SNSs display improved HER activity with a low overpotential of 20.2 m V for achieving10 m A cm^(-2)in 1 mol L^(–1)KOH. This work not only provides an efficient catalyst for HOR and HER, but also promotes fundamental research on the fabrication and modification of catalysts in heterogeneous catalysis.

关键词： Interface engineering Snow-like Ru/RuO2 nanosheets Interfacial synergy Hydrogen oxidation reaction Hydrogen evolution reaction

来源：评论

学校读者我要写书评

暂无评论

Novel Dopamine-Derived Carbon Modified Fe-Based Metal-Organic Framework Enhanced Aptasensor Rendering Ultrasensitive Electrochemical Detection of Oxytetracycline

SSRN

引用

SSRN 2024年

作者： Song, Jialing Fan, Xiaoxuan Ee, Liang Ying Lin, Xuanhao Li, Sam Fong Yau Huang, Manhong Singapore Donghua University China Shanghai University College of Science Department of Chemistry International Joint Laboratory Catalyst Chemistry Shanghai200444 China College of Environmental Science and Engineering State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry Donghua University Shanghai201620 China National University of Singapore Department of Chemistry 3 Science Drive 3 Singapore117543 Singapore Advanced Membranes and Porous Materials Center Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia Chemical Engineering Program Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia National University of Singapore Environmental Research Institute T Lab Building 5A Engineering Drive 1 Singapore117411 Singapore

In the present work, an aptasensor with dual binding sites based on Au NPs modified with self-polymerized polydopamine (PDA) and Fe-MOF is successfully constructed. In terms of standard electron transfer, the cyclic voltammetry (CV) analysis showcases a rate constant (ks) of 96.0 s-1, signifying an exceptional electron transfer rate of oxytetracycline at the sensor interface of Apt/Au@PDA@NH2-MIL-101(Fe)/GCE. Further deepening the investigation into electrochemical kinetics using chronoamperometry (CA), we investigated the electrocatalytic parameters (Kcat) of Au@PDA@NH2-MIL-101(Fe) in relation to oxytetracycline. The results divulged an impressive average Kcat value of 3.06×105 M-1 S-1. This evidence robustly suggests the superior electrocatalytic activity of Au@PDA@NH2-MIL-101(Fe) when it comes to oxytetracycline oxidation. A custom-designed portable rapid detection platform was developed, achieving detection limits of 6.88 nM under static water flow conditions and 5.56 nM under dynamic conditions. Remarkably, the self-polymerization of PDA on Au NPs not only refines their size but also boosts their interaction with biomolecules, thereby promising excellent biocompatibility. Moreover, the abundance of -COOH groups and unsaturated Fe3+ sites on the NH2-MIL-101(Fe) surface furnishes a considerable number of grafting sites for the aptamer. More importantly, the redox interplay between Au@PDA and NH2-MIL-101(Fe) accelerates electron movement, thus amplifying the electrochemical signal and the detection sensitivity for oxytetracycline. © 2024, The Authors. All rights reserved.

关键词： Rate constants

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：