Graphitic carbon nitride(g-C_(3)N_(4))has attracted great interest in photocatalysis and photoelectrocatalysis.However,their poor hydrophilicity poses a great challenge for their applications in aqueous environment.He...Graphitic carbon nitride(g-C_(3)N_(4))has attracted great interest in photocatalysis and photoelectrocatalysis.However,their poor hydrophilicity poses a great challenge for their applications in aqueous environment.Here,we demonstrate synthesis of a hydrophilic bi-functional hierarchical architecture by the assembly of B-doped g-C_(3)N_(4)nanoplatelets.Such hierarchical B-doped g-C_(3)N_(4)material enables full utilization of their highly enhanced visible light absorption and photogenerated carrier separation in aqueous medium,leading to an excellent photocatalytic H_(2)O_(2)production rate of 4240.3μM g^(-1)h^(-1),2.84,2.64 and 2.13 times higher than that of the bulk g-C_(3)N_(4),g-C_(3)N_(4)nanoplatelets and bulk B doped g-C_(3)N_(4),respectively.Photoanodes based on these hierarchical architectures can generate an unprecedented photocurrent density of 1.72 m A cm^(-2)at 1.23 V under AM 1.5 G illumination for photoelectrochemical water splitting.This work makes a fundamental improvement towards large-scale exploitation of highly active,hydrophilic and stable metal-free g-C_(3)N_(4)photocatalysts for various practical applications.展开更多
A novel conductive drug-loading system was prepared by using an improved emulsion electrostatic spinning method which contained polylactic acid (PLA),graphene oxide (GO),and nerve growth factor (NGF) coated with bovin...A novel conductive drug-loading system was prepared by using an improved emulsion electrostatic spinning method which contained polylactic acid (PLA),graphene oxide (GO),and nerve growth factor (NGF) coated with bovine serum albumin (BSA) nanoparticles.Firstly,the structure,mechanical properties,morphology and electrical conductivity of PLA/GO electro spun fiber membranes with different GO ratios were characterized.PLA/GO scaffolds can exhibit superior porosity,hydrophilic and biomechanical properties when the GO incorporation rate is 0.5%.The addition of GO in the PLA/GO electro spun fiber membranes can also create appropriate pH environment for the repair of injured nerve when the GO incorporation rate is above 0.5%.Secondly,PLA/GO/BSA/Genipin/NGF particles (with a ratio of BSA/NGF=3:1) prepared by modified emulsion electro spinning method will release more NGF than PLA/GO/NGF particles.In addition,PLA/0.5%GO/NGF scaffold can maintain its structure stability for at least 8 weeks observed by scanning electron microscope (SEM).Moreover,the degradation of PLA/0.5%GO/NGF scaffold is consistent with its weight loss.Finally,in vitro assay confirmes that PLA/GO composite scaffold exhibits low cytotoxicity to RSC96 cells.Cellular results have demonstrated that PLA/0.5%GO/NGF sustained-release drug sustained-release system with appropriate electrical stimulation (ES) can promote PC12 cell proliferation,and it can maintain its differentiation capability for at least 3 weeks.In conclusion,PLA/0.5%GO/NGF sustained-release drug sustained-release system can maintain its biological activity for at least 3 weeks and promote cell proliferation with appropriate ES.展开更多
Owing to their high luminous efficiency and tunable emission in both red light and far-red light regions,Mn^(4+)ion-activated phosphors have appealed significant interest in photoelectric and energy conversion devices...Owing to their high luminous efficiency and tunable emission in both red light and far-red light regions,Mn^(4+)ion-activated phosphors have appealed significant interest in photoelectric and energy conversion devices such as white light emitting diode(W-LED),plant cultivation LED,and temperature thermometer.Up to now,Mn^(4+)has been widely introduced into the lattices of various inorganic hosts for brightly redemitting phosphors.However,how to correlate the structure-activity relationship between host framework,luminescence property,and photoelectric device is urgently demanded.In this review,we thoroughly summarize the recent advances of Mn^(4+)doped phosphors.Meanwhile,several strategies like co-doping and defect passivation for improving Mn^(4+)emission are also discussed.Most importantly,the relationship between the protocols for tailoring the structures of Mn^(4+)doped phosphors,increased luminescence performance,and the targeted devices with efficient photoelectric and energy conversion efficiency is deeply correlated.Finally,the challenges and perspectives of Mn^(4+)doped phosphors for practical applications are anticipated.We cordially anticipate that this review can deliver a deep comprehension of not only Mn^(4+)luminescence mechanism but also the crystal structure tailoring strategy of phosphors,so as to spur innovative thoughts in designing advanced phosphors and deepening the applications.展开更多
As an alternative for lithium-ion batteries(LIBs),sodium-ion batteries(SIBs)have lately received tremendous interest due to their abundant reserves as well as low cost.Nevertheless,the lack of suitable anode materials...As an alternative for lithium-ion batteries(LIBs),sodium-ion batteries(SIBs)have lately received tremendous interest due to their abundant reserves as well as low cost.Nevertheless,the lack of suitable anode materials severely hinders the application of sodium-ion batteries.TiS_(2)is elected as a representative material owing to its unique layered structure.But it always suffers from capacity fade due to poor electrochemical kinetics and structural stability.In this work,we fabricate a pre-potassiated TiS_(2)as a host material for sodium storage by an electrochemical pre-potassiation strategy.The intercalation/extraction mechanism,structural changes and reaction kinetics are completely investigated to reveal the outstanding electrochemical property of pre-potassiated TiS_(2)electrode.It turns out that the large interlayer space of pre-potassiated TiS_(2)is conducive to the diffusion of sodium ions,inducing the reduction of entropic barrier for the electrochemical reactions.In addition,the pre-potassiated host structure is still firmly maintained upon repeated cycles.Therefore,the pre-potassiated TiS_(2)presents superior rate capability(165.9 mA h g^(−1) at 1 C and 132.1 mA h g^(−1) at 20 C)and long-term cycling stability(85.3%capacity retention at 5 C after 500 cycles)for SIBs.This research provides an avenue to construct long-life sodium energy storage systems based on pre-potassiated TiS_(2).展开更多
The introduction of vacancy defects in semiconductors has been proven to be a highly effective approach to improve their photocatalytic activity owing to their advantages of promoting light absorption,facilitating pho...The introduction of vacancy defects in semiconductors has been proven to be a highly effective approach to improve their photocatalytic activity owing to their advantages of promoting light absorption,facilitating photogenerated carrier separation,optimizing electronic structure,and enabling the production of reactive radicals.Herein,we outline the state-of-the-art vacancy-engineered photocatalysts in various applications and reveal how the vacancies influence photocatalytic performance.Specifically,the types of vacancy defects,the methods for tailoring vacancies,the advanced characteri-zation techniques,the categories of photocatalysts with vacancy defects,and the corresponding photocatalytic behaviors are presented.Meanwhile,the methods of vacancies creation and the related photocatalytic performance are correlated,which can be very useful to guide the readers to quickly obtain in-depth knowledge and to have a good idea about the selection of defect engineering methods.The precise characterization of vacancy defects is highly challenging.This review describes the accurate use of a series of characterization techniques with detailed comments and suggestions.This represents the uniqueness of this comprehensive review.The challenges and development prospects in engineering photocatalysts with vacancy defects for practical applications are discussed to provide a promising research direction in this field.展开更多
If the operating voltage of anode materials is below 1.0 V versus Lit/Li,the side reaction between electrolyte and anode materials will occur extensively.Thus,high-voltage anode materials have aroused interest recentl...If the operating voltage of anode materials is below 1.0 V versus Lit/Li,the side reaction between electrolyte and anode materials will occur extensively.Thus,high-voltage anode materials have aroused interest recently.In this work,we report the preparation of PNb9O25 nanofiber via a facile electrospinning method.The PNb9O25 nanofiber shows the high rate performance and excellent cycling performance when it is used as anode in lithium ions batteries.For instance,the PNb9O25 nanofiber can deliver a capacity of 233,212.1,193.8,and 181.4 mA h g^(-1) at 0.2,1,3,and 6C,respectively.After 1000 cycles,it can reach at 134.3 mA h g^(-1) with capacity retention of 70.9%.Meanwhile,the ex situ X-ray photoelectron spectroscopy technique has been adopted to investigate the evolution in valence state of each element for PNb9O25 nanofiber.In addition,the PNb9O25 nanofiber is chosen as the anode material in lithium ion full cell in this work,demonstrating the potential for practical application.展开更多
以新能源为主体的微电网系统存在前期资本投入大、电网刚性不足等问题,特别是离网型微电网由于失去大电网的支撑,安全稳定运行面临更大的挑战。本文针对离网型交流微电网设计了双层调度策略,即经济最优化日前调度和日内稳定运行实时调度...以新能源为主体的微电网系统存在前期资本投入大、电网刚性不足等问题,特别是离网型微电网由于失去大电网的支撑,安全稳定运行面临更大的挑战。本文针对离网型交流微电网设计了双层调度策略,即经济最优化日前调度和日内稳定运行实时调度,在多时间尺度下灵活规划发电主体出力。首先,日前调度以微电网经济性运行为目标,利用全生命周期理论建立经济模型,计及储能电池荷电状态(state of charge,SOC)对寿命的影响;其次,日内实时调度以供电稳定性为目标,充分考虑预测误差给系统带来的可能性崩溃,利用储能PQ源实时修正VF源的功率偏差,改善储能VF源的健康状态;最后,通过算例仿真,得到满足微电网经济、稳定运行的综合优化调度方案,并验证了该策略的有效性和合理性。展开更多
基金financially supported by the National Natural Science Foundation of China(U1663225)the Changjiang Scholar Program of Chinese Ministry of Education(IRT15R52)the program of Introducing Talents of Discipline to Universities-Plan 111(B20002)of Ministry of Science and Technology and the Ministry of Education of China and the project “Depollut Air”of Interreg V France-WallonieVlaanderen。
文摘Graphitic carbon nitride(g-C_(3)N_(4))has attracted great interest in photocatalysis and photoelectrocatalysis.However,their poor hydrophilicity poses a great challenge for their applications in aqueous environment.Here,we demonstrate synthesis of a hydrophilic bi-functional hierarchical architecture by the assembly of B-doped g-C_(3)N_(4)nanoplatelets.Such hierarchical B-doped g-C_(3)N_(4)material enables full utilization of their highly enhanced visible light absorption and photogenerated carrier separation in aqueous medium,leading to an excellent photocatalytic H_(2)O_(2)production rate of 4240.3μM g^(-1)h^(-1),2.84,2.64 and 2.13 times higher than that of the bulk g-C_(3)N_(4),g-C_(3)N_(4)nanoplatelets and bulk B doped g-C_(3)N_(4),respectively.Photoanodes based on these hierarchical architectures can generate an unprecedented photocurrent density of 1.72 m A cm^(-2)at 1.23 V under AM 1.5 G illumination for photoelectrochemical water splitting.This work makes a fundamental improvement towards large-scale exploitation of highly active,hydrophilic and stable metal-free g-C_(3)N_(4)photocatalysts for various practical applications.
基金the financial support from the China Scholarship Council(201808310127)Hubei Provincial Department of Education for the“Chutian Scholar”program+2 种基金financially supported by the Foundation of Natural Science(61905159)the National Natural Science Foundation of China(U1663225)Program for Changjiang Scholars and Innovative Research Team(IRT_15R52)the project“Depollut Air”of Interreg V France-Wallonie-Vlaanderen。
基金Funded by the National Natural Science Foundation of China(No.51572206)the Wuhan Huanghe Excellence Plan+1 种基金Natural Science Foundation of Hubei(2018CFB487)the National Innovation and Entrepreneurship Training Program for College Students(Nos.202010497028,202010497030,and 202010497062)。
文摘A novel conductive drug-loading system was prepared by using an improved emulsion electrostatic spinning method which contained polylactic acid (PLA),graphene oxide (GO),and nerve growth factor (NGF) coated with bovine serum albumin (BSA) nanoparticles.Firstly,the structure,mechanical properties,morphology and electrical conductivity of PLA/GO electro spun fiber membranes with different GO ratios were characterized.PLA/GO scaffolds can exhibit superior porosity,hydrophilic and biomechanical properties when the GO incorporation rate is 0.5%.The addition of GO in the PLA/GO electro spun fiber membranes can also create appropriate pH environment for the repair of injured nerve when the GO incorporation rate is above 0.5%.Secondly,PLA/GO/BSA/Genipin/NGF particles (with a ratio of BSA/NGF=3:1) prepared by modified emulsion electro spinning method will release more NGF than PLA/GO/NGF particles.In addition,PLA/0.5%GO/NGF scaffold can maintain its structure stability for at least 8 weeks observed by scanning electron microscope (SEM).Moreover,the degradation of PLA/0.5%GO/NGF scaffold is consistent with its weight loss.Finally,in vitro assay confirmes that PLA/GO composite scaffold exhibits low cytotoxicity to RSC96 cells.Cellular results have demonstrated that PLA/0.5%GO/NGF sustained-release drug sustained-release system with appropriate electrical stimulation (ES) can promote PC12 cell proliferation,and it can maintain its differentiation capability for at least 3 weeks.In conclusion,PLA/0.5%GO/NGF sustained-release drug sustained-release system can maintain its biological activity for at least 3 weeks and promote cell proliferation with appropriate ES.
基金financially supported by the National Natural Science Foundation of China(52072101,51972088,U20A20122 and U1663225)the Program for Changjiang Scholars and Innovative Research Team in University(IRT_15R52)of the Chinese Ministry of Education+2 种基金the Program of Introducing Talents of Discipline to Universities-Plan 111(Grant No.B20002)from the Ministry of Science and Technology and the Ministry of Education of ChinaHubei Provincial Department of Education for the“Chutian Scholar”programsupported by the European Commission Interreg V FranceWallonie-Vlaanderen project“Depollut Air”。
文摘Owing to their high luminous efficiency and tunable emission in both red light and far-red light regions,Mn^(4+)ion-activated phosphors have appealed significant interest in photoelectric and energy conversion devices such as white light emitting diode(W-LED),plant cultivation LED,and temperature thermometer.Up to now,Mn^(4+)has been widely introduced into the lattices of various inorganic hosts for brightly redemitting phosphors.However,how to correlate the structure-activity relationship between host framework,luminescence property,and photoelectric device is urgently demanded.In this review,we thoroughly summarize the recent advances of Mn^(4+)doped phosphors.Meanwhile,several strategies like co-doping and defect passivation for improving Mn^(4+)emission are also discussed.Most importantly,the relationship between the protocols for tailoring the structures of Mn^(4+)doped phosphors,increased luminescence performance,and the targeted devices with efficient photoelectric and energy conversion efficiency is deeply correlated.Finally,the challenges and perspectives of Mn^(4+)doped phosphors for practical applications are anticipated.We cordially anticipate that this review can deliver a deep comprehension of not only Mn^(4+)luminescence mechanism but also the crystal structure tailoring strategy of phosphors,so as to spur innovative thoughts in designing advanced phosphors and deepening the applications.
基金sponsored by NSAF joint Fund(U1830106)Science and Technology Innovation 2025 Major Program of Ningbo(2018B10061)+1 种基金National Natural Science Foundation of China(U1632114,51901205)K.C.Wong Magna Fund in Ningbo University。
文摘As an alternative for lithium-ion batteries(LIBs),sodium-ion batteries(SIBs)have lately received tremendous interest due to their abundant reserves as well as low cost.Nevertheless,the lack of suitable anode materials severely hinders the application of sodium-ion batteries.TiS_(2)is elected as a representative material owing to its unique layered structure.But it always suffers from capacity fade due to poor electrochemical kinetics and structural stability.In this work,we fabricate a pre-potassiated TiS_(2)as a host material for sodium storage by an electrochemical pre-potassiation strategy.The intercalation/extraction mechanism,structural changes and reaction kinetics are completely investigated to reveal the outstanding electrochemical property of pre-potassiated TiS_(2)electrode.It turns out that the large interlayer space of pre-potassiated TiS_(2)is conducive to the diffusion of sodium ions,inducing the reduction of entropic barrier for the electrochemical reactions.In addition,the pre-potassiated host structure is still firmly maintained upon repeated cycles.Therefore,the pre-potassiated TiS_(2)presents superior rate capability(165.9 mA h g^(−1) at 1 C and 132.1 mA h g^(−1) at 20 C)and long-term cycling stability(85.3%capacity retention at 5 C after 500 cycles)for SIBs.This research provides an avenue to construct long-life sodium energy storage systems based on pre-potassiated TiS_(2).
基金This study was also supported by the European Commission Interreg V France-Wallonie-Vlaanderen project“DepollutAir.”Yang Ding is grateful for the financial support of the China Scholarship Council(201808310127)This study was financially supported by the National Natural Science Foundation of China(U20A20122)+1 种基金the Program for Changjiang Scholars and Innovative Research Team in University(IRT_15R52)of the Chinese Ministry of Education,the Program of Introducing Talents of Discipline to Universities-Plan 111(Grant No.B20002)the Ministry of Science and Technology and the Ministry of Education of China,and the National Key R&D Program of China(2016YFA0202602).
文摘The introduction of vacancy defects in semiconductors has been proven to be a highly effective approach to improve their photocatalytic activity owing to their advantages of promoting light absorption,facilitating photogenerated carrier separation,optimizing electronic structure,and enabling the production of reactive radicals.Herein,we outline the state-of-the-art vacancy-engineered photocatalysts in various applications and reveal how the vacancies influence photocatalytic performance.Specifically,the types of vacancy defects,the methods for tailoring vacancies,the advanced characteri-zation techniques,the categories of photocatalysts with vacancy defects,and the corresponding photocatalytic behaviors are presented.Meanwhile,the methods of vacancies creation and the related photocatalytic performance are correlated,which can be very useful to guide the readers to quickly obtain in-depth knowledge and to have a good idea about the selection of defect engineering methods.The precise characterization of vacancy defects is highly challenging.This review describes the accurate use of a series of characterization techniques with detailed comments and suggestions.This represents the uniqueness of this comprehensive review.The challenges and development prospects in engineering photocatalysts with vacancy defects for practical applications are discussed to provide a promising research direction in this field.
基金NSAF joint Fund(U1830106)National Natural Science Foundation of China(U1632114,21673064)K.C.Wong Magna Fund in Ningbo University.
文摘If the operating voltage of anode materials is below 1.0 V versus Lit/Li,the side reaction between electrolyte and anode materials will occur extensively.Thus,high-voltage anode materials have aroused interest recently.In this work,we report the preparation of PNb9O25 nanofiber via a facile electrospinning method.The PNb9O25 nanofiber shows the high rate performance and excellent cycling performance when it is used as anode in lithium ions batteries.For instance,the PNb9O25 nanofiber can deliver a capacity of 233,212.1,193.8,and 181.4 mA h g^(-1) at 0.2,1,3,and 6C,respectively.After 1000 cycles,it can reach at 134.3 mA h g^(-1) with capacity retention of 70.9%.Meanwhile,the ex situ X-ray photoelectron spectroscopy technique has been adopted to investigate the evolution in valence state of each element for PNb9O25 nanofiber.In addition,the PNb9O25 nanofiber is chosen as the anode material in lithium ion full cell in this work,demonstrating the potential for practical application.
文摘以新能源为主体的微电网系统存在前期资本投入大、电网刚性不足等问题,特别是离网型微电网由于失去大电网的支撑,安全稳定运行面临更大的挑战。本文针对离网型交流微电网设计了双层调度策略,即经济最优化日前调度和日内稳定运行实时调度,在多时间尺度下灵活规划发电主体出力。首先,日前调度以微电网经济性运行为目标,利用全生命周期理论建立经济模型,计及储能电池荷电状态(state of charge,SOC)对寿命的影响;其次,日内实时调度以供电稳定性为目标,充分考虑预测误差给系统带来的可能性崩溃,利用储能PQ源实时修正VF源的功率偏差,改善储能VF源的健康状态;最后,通过算例仿真,得到满足微电网经济、稳定运行的综合优化调度方案,并验证了该策略的有效性和合理性。
