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Stabilizing MXene suspension with polyhydric alcohols

Journal of Materials Science & Technology 2023年第34期165卷 219-224页

作者： renfei cheng Junchao Wang Tao Hu Yiming Zhao Yan Liang Xiaohui Wang Yanchun Zhou Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Institute of Materials Science and Devices School of Materials Science and EngineeringSuzhou University of Science and TechnologySuzhou 215009China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

MXenes have promises in myriad applications by virtue of two-dimensional nature and adjustable functional *** achieve the applications,MXenes are always first prepared in the form of aqueous ***,fast degradation caused by the attack of dissolved oxygen and water molecules is the main obstacle to the application of *** has come to light that the degradation preferentially takes place at defective sites and edges where defects *** tackle this problem and increase the stability,herein,using Ti_(3)C_(2)T_(x)MXene as a model material,we report a simple yet efficient strategy for long term storage of MXene suspension by introducing glycerol,a typical polyhydric *** effectiveness of the strategy is evidenced by structural compositional and morphological *** protects the defective sites of MXene flakes through restricting water and/or oxygen molecules from reactive *** is supported by ab initio molecular dynamics simulations that form hydrogen bonds between MXene and glycerol molecules just over defective *** this mechanism,other polyhydric alcohols,such as ethylene glycol and propylene glycol,are also effective in stabilizing Ti_(3)C_(2)T_(x)MXene *** strategy based on polyhydric alcohols has the potential to be extended to other MXenes,solving the most urgent challenge in the field of MXene engineering.

关键词： MXene Stability Polyhydric alcohols Glycerol Ethylene glycol and propylene glycol

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Tunnel-structured willemite Zn_(2)SiO_(4):Electronic structure,elastic,and thermal properties

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Journal of Advanced Ceramics 2022年第8期11卷 1249-1262页

作者： Ruqiao DAI renfei cheng Jiemin WANG Chao ZHANG Cuiyu LI Hailong WANG Xiaohui WANG Yanchun ZHOU Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Advanced Computing East China Sub-center Suma Technology Company LimitedKunshan 215300China School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China

Willemite Zn_(2)SiO_(4)crystallizes in such a way that Zn and Si are tetrahedrally coordinated with O in an ionic–covalent manner to form ZnO_(4)and SiO_(4)tetrahedra as the building *** tetrahedra are corner-sharing,of which one SiO_(4)tetrahedron connects eight ZnO_(4)tetrahedra,and one ZnO_(4)tetrahedron links four ZnO_(4)tetrahedra and four SiO_(4)*** unique crystallographic configuration gives rise to parallel tunnels with a diameter of 5.7Åalong the c-axis *** tunnel structure of Zn_(2)SiO_(4)definitely correlates with its interesting elastic and thermal *** the one hand,the elastic modulus,coefficient of thermal expansion(CTE),and thermal conductivity are ***_(2)SiO_(4)has low Vickers hardness of 6.6 GPa at 10 N and low thermal conductivity of 2.34 W/(m·K)at 1073 *** the other hand,the elastic modulus and CTE along the c-axis are significantly larger than those along the a-and b-axes,showing obvious elastic and thermal expansion ***,the Young’s modulus along the z direction(Ez=179 GPa)is almost twice those in the x and y directions(Ex=Ey=93 GPa).The high thermal expansion anisotropy is ascribed to the empty tunnels along the c-axis,which are capable of more accommodating the thermal expansion along the a-and *** striking properties of Zn_(2)SiO_(4)in elastic modulus,hardness,CTE,and thermal conductivity make it much useful in various fields of ceramics,such as low thermal expansion,thermal insulation,and machining tools.

关键词： Zn_(2)SiO_(4) electronic structure elastic properties thermal expansion thermal conductivity

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Intercalation-deintercalation design in MXenes for high-performance supercapacitors

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Nano Research 2022年第4期15卷 3213-3221页

作者： Zhenjiang Li Jun Dai Yiran Li Changlong Sun Alan Meng renfei cheng Jian Zhao Minmin Hu Xiaohui Wang School of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266061China College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266061China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China State Key Laboratory Base of Eco-chemical Engineering College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

MXene is a new intercalation pseudocapacitive electrode material for supercapacitor *** fast ion diffusion is significantly essential for MXene to achieve excellent electrochemical *** expansion of interlayer void by traditional spontaneous species intercalation always leads to a slight increase in capacitance due to the existence of species sacrificing the smooth diffusion of electrolyte ***,an effective intercalation-deintercalation interlayer design strategy is proposed to help MXene achieve higher *** cation intercalation leads to the expansion of interlayer *** electrochemical cation extraction,intercalated cations are deintercalated mostly,leaving a small number of cations trapped in the interlayer silt and serving as pillars to maintain the interlayer space,offering an open,unobstructed interlayer space for better ion migration and ***,a preferred surface with more-O terminations for redox reaction is created due to the reaction between cations and-OH *** a result,the processed MXene delivers a much improved capacitance compared to that of the original Ti_(3)C_(2)T_(x)electrode(T stands for the surface termination groups,such as-OH,-F,and-O).This study demonstrates an improvement of electrochemical performance of MXene electrodes by controlling the interlayer structure and surface chemistry.

关键词： MXene electrochemical ion intercalation−deintercalation interlayer design supercapacitor energy storage

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Corrigendum to“MXene-coated silk-derived carbon cloth toward flexible electrode for supercapacitor application”[***.27(2018)161–166]

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Journal of Energy Chemistry 2022年第8期31卷 652-654页

作者： Minmin Hu Tao Hua renfei cheng Jinxing Yang Cong Cui Chao Zhang Xiaohui Wang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

The authors regret that the printed version of the above article contained some errors.(1)The SEM images of CSC and CSC@Ti3C2Tx electrode in Fig.1 are corrected to reflect the originality of the images.

关键词： electrode corrected MXene

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Pt immobilized spontaneously on porous MXene/MAX hybrid monolith for hydrogen evolution reaction

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Chinese Chemical Letters 2020年第4期31卷 988-991页

作者： Cong Cui renfei cheng Chao Zhang Xiaohui Wang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Designing efficient electrocatalysts with low Pt loadings for hydrogen evolution reaction(HER)is urgently required for renewable and sustainable energy ***,we report a strategy that Pt nanoparticulates are spontaneously immobilized on porous MXene/MAX monolith as HER catalysts by utilizing the redox reaction between Ti3C2Tx MXene and[PtCl4]2 in H2 PtCl6 aqueous *** taking advantage of homogeneously distributed Pt nanoparticulates on highly electrically conductive porous Ti3C2Tx/Ti3AlC2 monolith,the as-prepared electrocatalysts show high catalytic performance for hydrogen ***,the binder-free electrocatalysts have Pt loadings as low as 8.9μg/cm^2,with low overpotential of 43 mV at a curre nt density of 10 mA/cm^2 and low Tafel slope that three times lower than porous Ti3C2Tx/Ti3AlC2 without Pt *** strategy offers a new approach to constructing ultra-low Pt-loading HER catalysts on the basis of in situ redox reaction between noble metal ions and MXenes.

关键词： Clean energy Hydrogen evolution reaction Pt catalyst MXene Porous MAX phase

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MXene-coated silk-derived carbon cloth toward flexible electrode for supercapacitor application

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Journal of Energy Chemistry 2018年第1期27卷 161-166页

作者： Minmin Hu Tao Hu renfei cheng Jinxing Yang Cong Cui Chao Zhang Xiaohui Wang Shenyang National Laboratory for Materials Science.Institute of Metal Research Chinese Academy of SdencesShenyang 110016LiaoningChina School of Materials Science and Engineering.University of Science and Technology of ChinaShenyang 110016LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Flexible supercapacitors are promising energy storage devices in wearable smart electronics. Exploring cost-efficient electrodes with high capacitance would promote the wide-scale application of such capacitors. Herein, in order to explore a methodology for preparing low cost, flexible, tough, and up-scalable supercapacitor electrodes, silk textile is directly carbonized to make a conductive free-standing textile substrate. Through mildly baking the surfactant-free TiCTflakes suspension loaded on the carbonized silk cloth, a uniform and adhesive coating consisting of nanometer-thick TiCTflakes is well established on the conductive fabric support, forming a MXene-coated flexible textile electrode. The fabricated electrode exhibits a high areal capacitance of 362 m F/cm~2 with excellent cyclability and flexibility. Moreover,capacitance changes neglegibly under the bending deformation mode. This study elucidates the feasibility of using silk-derived carbon cloth from biomss for MXene-based flexible supercapacitor.

关键词： MXene Silk texitle Carbon cloth Flexibility Supercapacitor

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MXenes induce epitaxial growth of size-controlled noble nanometals:A case study for surface enhanced Raman scattering(SERS)

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Journal of Materials Science & Technology 2020年第5期40卷 119-127页

作者： renfei cheng Tao Hu Minmin Hu Changji Li Yan Liang Zuohua Wang Hui Zhang Muchan Li Hailong Wang Hongxia Lu Yunyi Fu Hongwang Zhang Quan-Hong Yang Xiaohui Wang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China Department of Materials Science and Engineering Monash UniversityClaytonVictoria 3800Australia Institute of Microelectronics Key Laboratory of Microelectronic Devices and CircuitsPeking UniversityBeijing 100871China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China School of Chemical Engineering&Technology Tianjin UniversityTianjin 300072China

Noble nanometals are of significance in both scientific interest and technological applications,which are usually obtained by conventional wet-chemical *** surfactants are always used in the synthesis to prevent unexpected overgrowth and aggregation of noble ***,the surfactants are hard to remove and may interfere with plasmonic and catalytic studies,remaining surfactant-free synthesis of noble nanometals a ***,we report an approach to epitaxial growth of sizecontrolled noble nanometals on *** piloted by density functional theory calculations,along with work function experimental determination,kinetic and spectroscopic studies,epitaxial growth of noble nanometals is initiated via a mechanism that involves an in situ redox *** the redox,MXenes as two-dimensional solid reductants whose work functions are compatible with the reduction potentials of noble metal cations,enable spontaneous donation of electrons from the MXenes to noble metal cations and reduce the cations into nanoscale metallic metals on the outmost surface of *** surfactants nor external reductants are used during the whole synthesis process,which addresses a long-standing interference issue of surfactant and external reductant in the conventional wet-chemical ***,the MXenes induced noble nanometals are ***,noble nanometals firmly anchored on MXenes exhibit excellent performance towards surface enhanced Raman *** developed strategy will promote the nanostructure-controlled synthesis of noble nanometals,offering new opportunities to further improve advanced functional properties towards practical applications.

关键词： Two-dimensional materials MXene In situ redox Noble metal SERS

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CeO_2掺杂对SrNa_(0.5)Bi_(4.5)Ti_5O_(18)高温无铅压电陶瓷性能的影响

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材料研究学报 2015年第3期29卷 201-206页

作者：姬万滨初瑞清徐志军郝继功程仁飞聊城大学材料科学与工程学院聊城252059

用固相合成法制备SrNa0.5Bi4.5Ti5O18+x%(质量分数)CeO2(SNBTCx)铋层状无铅压电陶瓷,研究了CeO2掺杂对SNBTCx陶瓷微观结构和电性能的影响。结果表明,CeO2掺杂并未改变SNBTCx陶瓷的晶体结构,所有样品均为单一的铋层状结构陶瓷;CeO2掺杂... 详细信息

用固相合成法制备SrNa0.5Bi4.5Ti5O18+x%(质量分数)CeO2(SNBTCx)铋层状无铅压电陶瓷,研究了CeO2掺杂对SNBTCx陶瓷微观结构和电性能的影响。结果表明,CeO2掺杂并未改变SNBTCx陶瓷的晶体结构,所有样品均为单一的铋层状结构陶瓷;CeO2掺杂没有使SNBTCx陶瓷居里温度发生明显变化,居里温度均高于560℃;随着CeO2掺杂量的增加SNBTCx陶瓷材料的介电常数减小,但是其介电损耗先增大后减小。当CeO2掺杂量为0.3%(质量分数)时SNBTC0.03陶瓷具有最优电性能:Tc=567℃,d33=29 p C/N,tanδ=0.015,且在500℃退极化处理后,其d33仍保持在22 p C/N以上,说明SNBTC0.03陶瓷可在高温下应用。

关键词：无机非金属材料高温压电陶瓷铋层状压电性能温度稳定性

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针灸治疗阿尔茨海默病研究状况及趋势的可视化分析

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中国针灸 2024年第4期44卷 469-478页

作者：程乐朱才丰周冰原张佳玉王弛宋任飞陶丽安徽中医药大学研究生院合肥230038 安徽省针灸医院老年病三科合肥230061

基于知识图谱技术探究针灸治疗阿尔茨海默病的研究历程、热点和前沿趋势。检索中国期刊全文数据库(CNKI)、维普资讯中文期刊服务平台(VIP)、万方数据知识服务平台(Wanfang)、中国生物医学文献数据库(SinoMed)、PubMed、Web of Science ... 详细信息

基于知识图谱技术探究针灸治疗阿尔茨海默病的研究历程、热点和前沿趋势。检索中国期刊全文数据库(CNKI)、维普资讯中文期刊服务平台(VIP)、万方数据知识服务平台(Wanfang)、中国生物医学文献数据库(SinoMed)、PubMed、Web of Science 6个数据库1993年1月1日至2023年1月1日收录的针灸治疗阿尔茨海默病的文献,运用CiteSpace6.2.R2 Advance、VOSviewer V1.6.19软件绘制知识图谱并进行可视化分析。共纳入中文文献1228篇、英文文献309篇。高频关键词大致分为临床疾病关键词(阿尔茨海默病、老年痴呆)、治疗方式关键词(电针、针灸、针刺)及作用机制研究关键词(β-淀粉样蛋白、小鼠)。中文文献形成了13个关键词聚类(针灸、老年痴呆、针刺、电针等),英文文献形成了8个关键词聚类(电针、药物治疗、海马等)。高频腧穴关键词为百会、大椎、印堂、足三里、丰隆等。总结出针灸治疗AD相关“针法-穴位”聚类6个。针灸治疗AD的治法及治疗模式不断发展,临床研究趋势逐渐向新型治疗方式及临床疗效评价方面发展,针灸治疗AD作用机制研究更加深入。在各种治疗方式中,针灸、针刺、电针等治疗方式主流时间较早,音乐电针、水针等多种新型治疗方式逐渐展现。近30年来,针灸治疗阿尔茨海默病中英文文献研究主题主要集中在临床疗效观察及作用机制研究两个方面,临床治疗方式逐渐完善,作用机制的探索逐渐深入。

关键词：阿尔茨海默病针灸知识图谱文献计量学

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Bi_(1/2)Na_(1/2)Ti_(1-x)(Mo_(1/3)W_(1/3))_xO_3系无铅压电陶瓷介电和压电性能的研究

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陶瓷学报 2017年第3期38卷 378-381页

作者：徐志军程仁飞初瑞清郝继功杜鹃烟台大学环境与材料工程学院山东烟台264005 聊城大学材料科学与工程学院山东聊城252059

采用传统固相法制备出了Bi_(1/2)Na_(1/2)Ti_(1-x)(Mo_(1/3)W_(1/3))_xO_3(简称BNT-MW-100x)系无铅压电陶瓷材料,研究了Mo和W掺杂对BNT基陶瓷材料显微结构和电学性能的影响。研究结果表明,Mo和W掺杂并未影响BNT陶瓷的晶体结构,仍为纯钙... 详细信息

采用传统固相法制备出了Bi_(1/2)Na_(1/2)Ti_(1-x)(Mo_(1/3)W_(1/3))_xO_3(简称BNT-MW-100x)系无铅压电陶瓷材料,研究了Mo和W掺杂对BNT基陶瓷材料显微结构和电学性能的影响。研究结果表明,Mo和W掺杂并未影响BNT陶瓷的晶体结构,仍为纯钙钛矿型结构,而且致密性良好。当x=0.9%时,BNT-MW陶瓷的压电常数最大,d_(33)=108 pC/N,平面机电耦合系数最大,k_p=0.153。

关键词：钛酸铋钠无铅压电陶瓷压电性能介电性能

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