检索结果-南通市图书馆

High-rate electrochemical H_(2)O_(2) production over multimetallic atom catalysts under acidic–neutral conditions

Carbon Energy 2024年第1期6卷 44-62页

作者： Yueyu Tong Jiaxin Liu Bing-Jian Su Jenh-Yih Juang Feng Hou Lichang Yin Shi Xue Dou Ji Liang Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjinChina Institute for Superconducting and electronic Materials University of WollongongInnovation CampusNorth WollongongNew South WalesAustralia Department of Electrophysics National Chiao Tung UniversityHsinchuTaiwanChina Shenyang national Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyangLiaoningChina Institute of Energy Materials Science University of Shanghai for Science and TechnologyShanghaiChina

Hydrogen peroxide(H_(2)O_(2))production by the electrochemical 2-electron oxygen reduction reaction(2e−ORR)is a promising alternative to the energy-intensive anthraquinone process,and single-atom electrocatalysts show the unique capability of high selectivity toward 2e−ORR against the 4e−*** extremely low surface density of the single-atom sites and the inflexibility in manipulating their geometric/electronic configurations,however,compromise the H_(2)O_(2) yield and impede further performance ***,we construct a family of multiatom catalysts(MACs),on which two or three single atoms are closely coordinated to form high-density active sites that are versatile in their atomic configurations for optimal adsorption of essential*OOH *** them,the Cox–Ni MAC presents excellent electrocatalytic performance for 2e−ORR,in terms of its exceptionally high H_(2)O_(2) yield in acidic electrolytes(28.96 mol L^(−1) gcat.^(−1) h^(−1))and high selectivity under acidic to neutral conditions in a wide potential region(>80%,0–0.7 V).Operando X-ray absorption and density functional theory analyses jointly unveil its unique trimetallic Co2NiN8 configuration,which efficiently induces an appropriate Ni–d orbital filling and modulates the*OOH adsorption,together boosting the electrocatalytic 2e−ORR *** work thus provides a new MAC strategy for tuning the geometric/electronic structure of active sites for 2e−ORR and other potential electrochemical processes.

关键词： hydrogen peroxide production multiatom catalysts operando X-ray adsorption spectrum reaction mechanism tendency structure-property relation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Controlled fabrication of freestanding monolayer SiC by electron irradiation

引用

Chinese Physics B 2024年第8期33卷 31-37页

作者：笪蕴力罗瑞春雷宝季威周武 School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Renmin University of ChinaBeijing 100872China

The design and preparation of novel quantum materials with atomic precision are crucial for exploring new physics and for device *** irradiation has been demonstrated as an effective method for preparing novel quantum materials and quantum structures that could be challenging to obtain *** features the advantages of precise control over the patterning of such new materials and their integration with other materials with different ***,we present a new strategy for fabricating freestanding monolayer SiC within nanopores of a graphene *** regulating the energy of the incident electron beam and the in-situ heating temperature in a scanning transmission electron microscope(STEM),we can effectively control the patterning of nanopores and subsequent growth of monolayer SiC within the graphene *** resultant SiC monolayers seamlessly connect with the graphene lattice,forming a planar structure distinct by a wide direct *** in-situ STEM observations further uncover that the growth of monolayer SiC within the graphene nanopore is driven by a combination of bond rotation and atom extrusion,providing new insights into the atom-by-atom self-assembly of freestanding two-dimensional(2D)monolayers.

关键词： monolayer SiC 2D semiconductor in-situ growth in-situ STEM defect engineering graphene nanopores

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A hybrid nickel/iron-pyromellitic acid electrocatalyst for oxygen evolution reaction

引用

Nano Research 2024年第4期17卷 2481-2491页

作者： Guoqi Li Lin Li Wenlong Li Fusheng Li Chunze Yuan Nian Zhang Hui Zhang Tsu-Chien Weng School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China center for Transformative Science ShanghaiTech UniversityShanghai 201210China State Key Lab of Fine Chemicals Institute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesDalian University of Technology(DUT)Dalian 116024China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

The migration of protons during the oxygen evolution reaction(OER)is a key factor that affects the performance of OER *** enhance proton transportation,we designed a catalyst based on nickel/iron-pyromellitic acid(NiFe-PMA)prepared by the electrochemical deposition *** catalyst exhibited a low overpotential of 188 mV at a current density of 10 mA·cm^(-2),a Tafel slope of 28.2 mV·dec^(-1),and long-term stability for 30 days with a current of 50 mA·cm^(-2).We characterized the NiFe-PMA catalyst using various techniques,including Fourier transform infrared(FTIR)spectroscopy,Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),X-ray absorption spectroscopy(XAS),transmission electron microscopy(TEM),scanning electron microscopy(SEM),and inductively coupled plasma-optical emission spectrometry(ICP-OES).Our results showed that NiFe-PMA contains nickel,iron atoms,and both coordinated and uncoordinated carboxylate ***,XPS data confirmed that carboxylate ligands could adjust the outer electronic structure of metal ions,resulting in the high valence state of Ni in *** result of XAS indicated that the nickel atoms present in the catalyst might be easier to maintain a higher chemical *** investigations using kinetic isotope effects(KIEs)and proton inventory revealed that the uncoordinated carboxylic protons played a crucial role in receiving protons during the OER,which promoted the proton transfer of the rate-determining step of the *** novel electrocatalysts provide a new strategy for designing more active and cost-effective catalysts for the OER.

关键词： nickel/iron-pyromellitic acid oxygen evolution reaction kinetic isotope effects

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Mn-based MXene with high lithium-ion storage capacity

引用

Nano Research 2024年第5期17卷 4181-4191页

作者： Yanyan Wu Dongqing Liu Xiaonan Wang Usman Ghani Muhammad Asim Mushtaq Jinfeng Yang Huarui Sun Panagiotis Tsiakaras Xingke Cai School of Science and Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System Harbin Institute of Technology ShenzhenShenzhen 5180552 China Collaborative Innovation center of Extreme Optics Shanxi UniversityTaiyuan 030006China Institute for Advanced Study Shenzhen UniversityShenzhen 518060China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China Laboratory of Alternative Energy Conversion Systems Department of Mechanical EngineeringSchool of EngineeringUniversity of ThessalyPedion Areos 38834Greece

3d-transition metal(Fe,Co,Ni,and Mn)-based MXene materials have been predicted to demonstrate exceptional electrochemical performance because of their good electrical conductivity and the presence of metallic atoms with multiple charge ***,until now,there have been no reports on MXenes based on Fe,Co,Ni,and Mn,due to the lack of 3d-metal-layered ***,we successfully synthesized the first 3d-transition metal-based MXenes,Mn_(2)CT_(x) by exfoliating a layered precursor derived from the anti-perovskite bulk *** as-prepared Mn_(2)CT_(x) MXene nanosheets were employed as anode materials in lithium-ion batteries,which exhibited stable storage capacity of 764.7 mAh·g^(-1) at 0.5 C,placing its storage capacities at an upper-middle level compared with other reported MXene materials as well as other Mn-based anode ***,this study opens a new avenue for MXene research by synthesizing 3d-transition metal-based MXenes for electrochemical applications.

关键词： Mn_(3)GaC Mn_(2)CT_(x) MXenes lithium-ion battery anode materials negative fading capacity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

electron-irradiation-facilitated production of chemically homogenized nanotwins in nanolaminated carbides

引用

Journal of Advanced Ceramics 2023年第6期12卷 1288-1297页

作者： Hui Zhang Qianqian Jin Tao Hu Xiaochun Liu Zezhong Zhang Chunfeng Hu Yanchun Zhou Yu Han Xiaohui Wang electron microscopy center South China University of TechnologyGuangzhou 510640China School of Emergent Sof Mater South China University of TechnologyGuangzhou 510640China center for the Structure of Advanced Matter School of Electronic EngineeringGuangxi University of Science and TechnologyLiuzhou 545006China Institute of Materials Science and Devices School of Materials Science and EngineeringSuzhou University of Science and TechnologySuzhou 215009China Institute of Metals Changsha University of Science&TechnologyChangsha 410004China electron microscopy for Materials Research(EMAT) University of AntwerpAntwerp 2020Belgium Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China School of Materials Science&Engineering Zhengzhou UniversityZhengzhou 4501China Advanced Membranes and Porous Materials center Physical Sciences and Engineering DivisionKing Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia Shenyang national Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Twin boundaries have been exploited to stabilize ultrafine grains and improve mechanical properties of *** production of the twin boundaries and nanotwins is however prohibitively challenging in carbide *** a scanning transmission electron microscope as a unique platform for atomic-scale structure engineering,we demonstrate that twin platelets could be produced in carbides by engineering antisite *** antisite defects at metal sites in various layered ternary carbides are collectively and controllably generated,and the metal elements are homogenized by electron irradiation,which transforms a twin-like lamellae into nanotwin *** chemical homogenization,α-Ti_(3)AlC_(2) transforms to unconventionalβ-Ti_(3)AiC_(2).The chemical homogeneity and the width of the twin platelets can be tuned by dose and energy of bombarding *** homogenized nanotwins can boost hardness by~45%.Our results provide a new way to produce ultrathin(electron probe.

关键词： electron-irradiation MAX phases carbides antisite defects crystal-structure engineering

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Structural characteristics of the SARS-CoV-2 Omicron lineages BA.1 and BA.2 virions

引用

Signal Transduction and Targeted Therapy 2023年第4期8卷 1381-1383页

作者： Xiaoyu Ma Yanqun Wang Yuanzhu Gao Yiliang Wang An Yan Jiantao Chen Lu Zhang Peiyi Wang Jincun Zhao Zheng Liu Cryo-electron microscopy center Southern University of Science and TechnologyShenzhenGuangdongChina State Key Laboratory of Respiratory Disease National Clinical Research Center for Respiratory DiseaseGuangzhou Institute of Respiratory Healththe First Affiliated Hospital of Guangzhou Medical UniversityGuangzhouGuangdongChina Health and Quarantine Laboratory Guangzhou Customs District Technology CentreGuangzhouChina Guangzhou Laboratory Bio-IslandGuangzhouChina Institute of Infectious disease Guangzhou Eighth People’s Hospital of Guangzhou Medical UniversityGuangzhouGuangdongChina

Dear Editor,Variants of concern(VOCs)of SARS-CoV-2 have increased transmissibility,virulence,and *** emergence of new VOCs continues to pose great challenges to public *** detailed structures of the intact Omicron viruses remain *** this study,we report the architecture of both Omicron BA.1 and BA.2 lineages using cryo-electron tomography(cryo-ET).The subtomogram averaging of viral spikes,in both pre-fusion and postfusion conformations are also investigated.

关键词： characteristics Omi resistance.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Silk Fibroin Nacre

引用

Advanced Fiber Materials 2022年第5期4卷 1191-1208页

作者： Chenxi Zhao Yawen Liu Zhuochen Lv Leitao Cao Jing Ren Zhengzhong Shao Shengjie Ling School of Physical Science and Technology ShanghaiTech University393 Middle Huaxia RoadShanghai 201210China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceLaboratory of Advanced MaterialsFudan UniversityShanghai 200433China

Producing lightweight,mechanically strong,ductile,and biocompatible materials remains a significant challenge in material engineering due to the conflict between structural and mechanical *** by the“brick-and-mortar”structure of nacre,a construction with a naturally optimized structure-performance-function relationship,this study developed silk fibroin(SF)nacre as a silk protein-based nacre by integrating ice-templating and thermoplastic molding *** nacres are similar to natural nacre in microstructure,and their strength and toughness are even superior to natural *** mechani-cal properties permit machining by extreme processing techniques,such as ion beam ***,SF nacre can be used to modulate the polarization of laser beams and generate bright structural ***,mechanical robustness,good processability,and tunable coloration allow SF nacres to be used as a plastic replacement for structural engineering and biomedical use,showing promising advancement of such implantable devices towards clinical translation.

关键词： Silk fibroin Nacre Mechanical properties Optical modulation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High-performance Ta-doped Li_(7)La_(3)Zr_(2)O_(12) garnet oxides with AlN additive

引用

Journal of Advanced Ceramics 2022年第10期11卷 1530-1541页

作者： Chang ZHANG Xiangchen HU Zhiwei NIE Cong WU Nan ZHENG Shaojie CHEN Yihang YANG Ran WEI Jiameng YU Nan YANG Yi YU Wei LIU School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Key Laboratory of High-resolution electron microscopy ShanghaiTech UniversityShanghai 201210China

Garnet-type oxide is one of the most promising solid-state electrolytes(SSEs)for solid-state lithium-metal batteries(SSLMBs).However,the Li dendrite formation in garnet oxides obstructs the further development of the SSLMBs ***,we report a high-performance garnet oxide by using AlN as a sintering additive and Li as an anode interface *** with high thermal conductivity can promote the sintering activity of the garnet oxides,resulting in larger particle size and higher relative ***,Li3N with high ionic conductivity formed at grain boundaries and interface can also improve Li-ion transport *** a result,the garnet oxide electrolytes with AlN show enhanced thermal conductivity,improved ionic conductivity,reduced electronic conductivity,and increased critical current density(CCD),compared with the counterpart using Al_(2)O_(3) sintering *** addition,Li symmetric cells and Li|LiFePO_(4)(Li|LFP)half cells using the garnet electrolyte with the AlN additive exhibit good electrochemical *** work provides a simple and effective strategy for high-performance SSEs.

关键词： solid-state lithium-metal battery(SSLMB) garnet oxide thermal conductivity electronic conductivity critical current density(CCD)

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Docking MOF crystals on graphene support for highly selective electrocatalytic peroxide production

引用

Nano Research 2022年第1期15卷 145-152页

作者： Xiaofeng Huang Peter Oleynikov Hailong He Alvaro Mayoral Linqin Mu Feng Lin Yue-Biao Zhang School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Department of Chemistry Virginia TechBlacksburgVA 24061USA

Tailoring the reaction kinetics is the central theme of designer electrocatalysts,which enables the selective conversion of abundant and inert atmospheric species into useful *** we show a supporting effect in tuning the electrocatalytic kinetics of oxygen reduction reaction(ORR)from four-electron to two-electron mechanism by docking metalloporphyrin-based metal-organic frameworks(MOFs)crystals on graphene support,leading to highly selective peroxide production with faradaic efficiency as high as 93.4%.A magic angle of 38.1°tilting for the co-facial alignment was uncovered by electron diffraction tomography,which is attributed to the maximization of n-n interaction for mitigating the lattice and symmetry mismatch between MOF and *** facilitated electron migration and oxygen chemisorption could be ascribed to the supportive effect of graphene that disperses of the electron state of the active center,and ultimately regulates rate-determining step.

关键词： metal-organic frameworks nanocomposites support effect oxygen reduction reaction peroxide selectivity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Induced Non-Volatile Resistive Switching Effect in Silicon Devices with Large Magnetoresistance

引用

Chinese Physics Letters 2014年第7期31卷 156-159页

作者：王集敏章晓中朴红光罗昭初熊成悦 Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 national center for electron microscopy (Beijing) Tsinghua University Beijing 100084

We develop a non-volatile resistive switching device in a Si-SiO2-Mg structure with an on/off ratio of about 4.5 at a certain transition voltage after being stimulated by a large current. It is observed that the resistance transition voltage Vt shifts reproducibly under a reversed large current. By applying a reading voltage in the range of Vt, non-volatile resistive switching phenomena with an endurance of more than 80 cycles are observed. Moreover, it is also found that the magnetic field could shift Vt to higher values, yielding a voltage dependent room-temperature magnetoresistance in the range of 10^3 % at 1 T. The multifunctional properties of the silicon device suggested by this work may be beneficial to the silicon based industry.

关键词： Magnetoresistance

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：