目的基于文献计量学总结国内外仿制药领域的研究现状及趋势,为进一步研究提供参考。方法通过检索收集中国学术期刊全文数据库(CNKI)、Web of Science数据库中收录的相关文献,借助CiteSpace6.3R2、VOSview1.6.20、文献计量学在线分析平...目的基于文献计量学总结国内外仿制药领域的研究现状及趋势,为进一步研究提供参考。方法通过检索收集中国学术期刊全文数据库(CNKI)、Web of Science数据库中收录的相关文献,借助CiteSpace6.3R2、VOSview1.6.20、文献计量学在线分析平台等探讨本领域的作者机构合作、国家合作概况,并分析关键词共现、聚类、突现等,并对分析结果可视化展示。结果共纳入2564篇文献,其中中文文献641篇,英文文献1923篇。刊文趋势表明,国内外仿制药领域研究的发展趋势基本相同。目前本领域研究已有国际化趋势,但我国的国际合作中心性为0。关键词分析显示,国内外仿制药领域研究内容在保持一致的前提下各有侧重,其研究内容与热点可相互补充借鉴。结论系统分析了2000—2024年间仿制药领域的相关文献,总结了目前全球仿制药领域的研究现状及趋势,并进一步指出国内外研究的异同,可为本领域的进一步研究提供指导。展开更多
地热作为绿色低碳的可再生能源,在能源领域具有重要意义。为了探究当前国内外学者在地热领域的研究方向和热点,明确地热研究的发展前景,对2000—2023年中国知网(CNKI)和Web of Science(WoS)数据库所收录的地热领域高质量文献进行检索,...地热作为绿色低碳的可再生能源,在能源领域具有重要意义。为了探究当前国内外学者在地热领域的研究方向和热点,明确地热研究的发展前景,对2000—2023年中国知网(CNKI)和Web of Science(WoS)数据库所收录的地热领域高质量文献进行检索,并利用VOS viewer进行可视化分析,掌握数据库年发文量、国家和机构、期刊发文量、高被引文献及文献所涉及的关键词。研究结果表明,在2000—2023年间,地热研究方向中英文文献的发文量总体均呈上升趋势;在发文机构方面,中国地质大学、中国科学院等中国科研机构已跃升为发文的重要基石,主要发表在《水文地质工程地质》《Geothermics》《太阳能学报》《Geothermics》的文献最多,为1213篇;地热领域研究主要集中于地热资源勘探与开发。研究可为科研人员全面了解2000年至今的地热研究现状与未来发展趋势提供参考。展开更多
Developing high-performance anode materials is crucial for the advancement of sodium-ion capacitors with high-energy density and large power density.Bimetallic oxides exhibit a high specific capacity due to their syne...Developing high-performance anode materials is crucial for the advancement of sodium-ion capacitors with high-energy density and large power density.Bimetallic oxides exhibit a high specific capacity due to their synergistic effects in electrochemical processes.However,challenges such as poor electrical conductivity,slow ion transport,and volume expansion severely limit their development.In this study,Co_(2)VO_(4)@C-1.5 was synthesized through a straightforward method involving solvent-heating and carbonization via calcination.The synergistic effect of Co and V,mitigation of volume expansion by the carbon-coated layer,enhancement of pseudocapacitive behavior and improved electrical conductivity of Co_(2)VO_(4)@C-1.5 contribute to its superior electrochemical performance.The specific capacity of Co_(2)VO_(4)@C-1.5 remained steady at 288.8 and 171.7 mAh g^(-1)after 100 and 500 cycles at 100 and 1000 mA g^(-1),respectively.Density functional theory(DFT)calculations show a notable reduction in the energy barrier of Co_(2)VO_(4)@C-1.5.Furthermore,the assembled sodium-ion capacitor Co_(2)VO_(4)@C-1.5//AC demonstrates high-energy density(108.5 Wh kg^(-1)at 99.8 W kg^(-1)),remarkable power density(38.2 Wh kg^(-1)at 12,000 W kg^(-1)),and longcycle stability(capacity retention of 80.6%after 6000 cycles).The design and optimization of the carbon-coated structure provide valuable insights for the development of bimetallic oxide materials in sodium-ion capacitors(SICs).展开更多
A pseudocapacitance dominated anode material assembled from Li_(3)VO_(4)nanocrystals encapsulated in the interlayers of N-doped graphene has been developed via a facile 2D nanospace confined strategy for lithium ion c...A pseudocapacitance dominated anode material assembled from Li_(3)VO_(4)nanocrystals encapsulated in the interlayers of N-doped graphene has been developed via a facile 2D nanospace confined strategy for lithium ion capacitors(LICs).In this contribution,the N-doped graphene synthesized by a faicle solid state reaction using C_(3)N_(4)nanosheets as template and glucose as carbon source provides sufficient 2D nanospace for the confined and homogeneous growth of Li_(3)VO_(4)at the nanoscale,and simultaneously efficiently anchors each nanobuilding block inside the interlayers,thus realizing the utilizaiton of full potential of active components.The so-formed 3D hybrids not only ensure intimate electronic coupling between active materials and N-doped graphene,but also realize robust structure integrity.Owing to these unique advantages,the resulting hybrids show pseudocapacitance dominated lithium storage behaviors with capacitive contributions of over 90%at both low and high current rates.The LVO@C@NG delivers reversible capacities of 206 mAh/g at 10 A/g,capacity retention of 92.7%after 1000 cycles at 2 A/g,and a high energy density of 113.6 Wh/kg at 231.8 W/kg for LICs.展开更多
The vanadates of LiNi1-xMxVO4(M=Fe,Co,Ni) containing VO4 tetrahedrons were synthesized by soft chemical method through a new mild liquid route. The samples sintered at 450℃ for 3h and at 650℃ for 3h are named for LT...The vanadates of LiNi1-xMxVO4(M=Fe,Co,Ni) containing VO4 tetrahedrons were synthesized by soft chemical method through a new mild liquid route. The samples sintered at 450℃ for 3h and at 650℃ for 3h are named for LT LiNiVO4 and for MT LiNi1-xMxVO4 respectively. All of the products were measured by X ray diffraction, IR and Raman spectra respectively. In comparison with IR spectra of V2O5 and NiO, the LT LiNiVO4 has a strong and broad IR absorption band of VO4 tetrahedrons located at 600～850cm-1 with three small splitting peaks corresponding to the asymmetry stretching vibrations of V O bonds. The results of IR and Raman spectra for MT LiNi1-xMxVO4 show that the cations of Ni2+, Co2+, Fe2+ have the influences on the frequency shifts of the V O vibrations.展开更多
文摘目的基于文献计量学总结国内外仿制药领域的研究现状及趋势,为进一步研究提供参考。方法通过检索收集中国学术期刊全文数据库(CNKI)、Web of Science数据库中收录的相关文献,借助CiteSpace6.3R2、VOSview1.6.20、文献计量学在线分析平台等探讨本领域的作者机构合作、国家合作概况,并分析关键词共现、聚类、突现等,并对分析结果可视化展示。结果共纳入2564篇文献,其中中文文献641篇,英文文献1923篇。刊文趋势表明,国内外仿制药领域研究的发展趋势基本相同。目前本领域研究已有国际化趋势,但我国的国际合作中心性为0。关键词分析显示,国内外仿制药领域研究内容在保持一致的前提下各有侧重,其研究内容与热点可相互补充借鉴。结论系统分析了2000—2024年间仿制药领域的相关文献,总结了目前全球仿制药领域的研究现状及趋势,并进一步指出国内外研究的异同,可为本领域的进一步研究提供指导。
文摘地热作为绿色低碳的可再生能源,在能源领域具有重要意义。为了探究当前国内外学者在地热领域的研究方向和热点,明确地热研究的发展前景,对2000—2023年中国知网(CNKI)和Web of Science(WoS)数据库所收录的地热领域高质量文献进行检索,并利用VOS viewer进行可视化分析,掌握数据库年发文量、国家和机构、期刊发文量、高被引文献及文献所涉及的关键词。研究结果表明,在2000—2023年间,地热研究方向中英文文献的发文量总体均呈上升趋势;在发文机构方面,中国地质大学、中国科学院等中国科研机构已跃升为发文的重要基石,主要发表在《水文地质工程地质》《Geothermics》《太阳能学报》《Geothermics》的文献最多,为1213篇;地热领域研究主要集中于地热资源勘探与开发。研究可为科研人员全面了解2000年至今的地热研究现状与未来发展趋势提供参考。
基金financially supported by the Applied Basic Research Project of Qinghai Province(No.2024-ZJ-766)the Youth Innovation Promotion Association CAS(No.2018466)
文摘Developing high-performance anode materials is crucial for the advancement of sodium-ion capacitors with high-energy density and large power density.Bimetallic oxides exhibit a high specific capacity due to their synergistic effects in electrochemical processes.However,challenges such as poor electrical conductivity,slow ion transport,and volume expansion severely limit their development.In this study,Co_(2)VO_(4)@C-1.5 was synthesized through a straightforward method involving solvent-heating and carbonization via calcination.The synergistic effect of Co and V,mitigation of volume expansion by the carbon-coated layer,enhancement of pseudocapacitive behavior and improved electrical conductivity of Co_(2)VO_(4)@C-1.5 contribute to its superior electrochemical performance.The specific capacity of Co_(2)VO_(4)@C-1.5 remained steady at 288.8 and 171.7 mAh g^(-1)after 100 and 500 cycles at 100 and 1000 mA g^(-1),respectively.Density functional theory(DFT)calculations show a notable reduction in the energy barrier of Co_(2)VO_(4)@C-1.5.Furthermore,the assembled sodium-ion capacitor Co_(2)VO_(4)@C-1.5//AC demonstrates high-energy density(108.5 Wh kg^(-1)at 99.8 W kg^(-1)),remarkable power density(38.2 Wh kg^(-1)at 12,000 W kg^(-1)),and longcycle stability(capacity retention of 80.6%after 6000 cycles).The design and optimization of the carbon-coated structure provide valuable insights for the development of bimetallic oxide materials in sodium-ion capacitors(SICs).
基金financially supported by the National Natural Science Foundation of China(Nos.52001059,52072119)Hunan Provincial Natural Science Foundation(No.2023JJ50015)the 111 Project(No.D20015)。
文摘A pseudocapacitance dominated anode material assembled from Li_(3)VO_(4)nanocrystals encapsulated in the interlayers of N-doped graphene has been developed via a facile 2D nanospace confined strategy for lithium ion capacitors(LICs).In this contribution,the N-doped graphene synthesized by a faicle solid state reaction using C_(3)N_(4)nanosheets as template and glucose as carbon source provides sufficient 2D nanospace for the confined and homogeneous growth of Li_(3)VO_(4)at the nanoscale,and simultaneously efficiently anchors each nanobuilding block inside the interlayers,thus realizing the utilizaiton of full potential of active components.The so-formed 3D hybrids not only ensure intimate electronic coupling between active materials and N-doped graphene,but also realize robust structure integrity.Owing to these unique advantages,the resulting hybrids show pseudocapacitance dominated lithium storage behaviors with capacitive contributions of over 90%at both low and high current rates.The LVO@C@NG delivers reversible capacities of 206 mAh/g at 10 A/g,capacity retention of 92.7%after 1000 cycles at 2 A/g,and a high energy density of 113.6 Wh/kg at 231.8 W/kg for LICs.
文摘The vanadates of LiNi1-xMxVO4(M=Fe,Co,Ni) containing VO4 tetrahedrons were synthesized by soft chemical method through a new mild liquid route. The samples sintered at 450℃ for 3h and at 650℃ for 3h are named for LT LiNiVO4 and for MT LiNi1-xMxVO4 respectively. All of the products were measured by X ray diffraction, IR and Raman spectra respectively. In comparison with IR spectra of V2O5 and NiO, the LT LiNiVO4 has a strong and broad IR absorption band of VO4 tetrahedrons located at 600～850cm-1 with three small splitting peaks corresponding to the asymmetry stretching vibrations of V O bonds. The results of IR and Raman spectra for MT LiNi1-xMxVO4 show that the cations of Ni2+, Co2+, Fe2+ have the influences on the frequency shifts of the V O vibrations.
