High-Ni layered oxide cathodes hold a great promise for fabricating highenergy lithium-ion batteries.However,the oxygen evolution during cycling is a crucial factor in the structure deterioration,potential change,and ...High-Ni layered oxide cathodes hold a great promise for fabricating highenergy lithium-ion batteries.However,the oxygen evolution during cycling is a crucial factor in the structure deterioration,potential change,and capacity decay of cathodes,limiting the commercial application of high-Ni(Ni>0.9)layered oxides in batteries.Herein,we demonstrate a feasible approach to enhance the stability of oxygen framework,through the surface oxygen immobilization with yttrium and bulk oxygen stabilization with aluminum in high-Ni layered oxides.As expected,benefiting from the oxygen-stabilized framework,the bulk structure deterioration,and interfacial parasitic reaction are mitigated obviously during battery operation,along with the improved thermal stability of cathode.Correspondingly,the as-prepared high-Ni oxide delivers high reversible capacity,impressive cycle ability,and low potential polarization upon cycling.Such significant improvement on the electrochemical performance is primarily attributed to the strong oxygen affinities of both yttrium at the surface layer and aluminum in the bulk,which synergistically stabilizes the oxygen framework of high-Ni oxide via raising the energy barrier for oxygen evolution.Therefore,building the stable oxygen framework is critical for enhancing the energy density output,cycle operation,and thermal stability of high-Ni oxide cathodes.展开更多
As lead halide perovskite(LHP)semiconductors have shown tremendous promise in many application fields,and particularly made strong impact in the solar photovoltaic area,low dimensional quantum dot forms of these perov...As lead halide perovskite(LHP)semiconductors have shown tremendous promise in many application fields,and particularly made strong impact in the solar photovoltaic area,low dimensional quantum dot forms of these perovskites are showing the potential to make distinct marks in the fields of electronics,optoelectronics and photonics.The so-called perovskite quantum dots(PQDs)not only possess the most important features of LHP materials,i.e.,the unusual high defect tolerance,but also demonstrate clear quantum size effects,along with exhibiting desirable optoelectronic properties such as near perfect photoluminescent quantum yield,multiple exciton generation and slow hot-carrier cooling.Here,we review the advantageous properties of these nanoscale perovskites and survey the prospects for diverse applications which include lightemitting devices,solar cells,photocatalysts,lasers,detectors and memristors,emphasizing the distinct superiorities as well as the challenges.展开更多
Although the gravimetric energy density of lithium-sulfur battery is very encouraging,the volumetric energy density still remains a challenge for the practical application.To achieve the high volumetric energy density...Although the gravimetric energy density of lithium-sulfur battery is very encouraging,the volumetric energy density still remains a challenge for the practical application.To achieve the high volumetric energy density of battery,much attention should be paid to the sulfur cathode.Herein,we introduce heavy lithium cobalt oxide(LiCoO_(2))nanofibers as sulfur host to enhance the volumetric capacity of cathode,maintaining the high gravimetric capacity simutaneously.With the high tap density of 2.26 g cm^(−3),LiCoO_(2)nanofibers can be used to fabricate a really compact sulfur cathode,with a density and porosity of 0.85 g cm^(−3)and 61.2%,respectively.More importantly,LiCoO2 nanofibers could act as an efficient electrocatalyst for enhancing the redox kinetics of sulfur species,ensuring the cathode electroactivity and alleviating the shuttle effect of polysulfides.Therefore,a balance between compact structure and high electrochemical activity is obtained for the sulfur cathode.At the sulfur loading of 5.1 mg cm^(−2),high volumetric and gravimetric capacities of 724 mA h cm^(−3)cathode and 848 mA h g^(−1)cathode could be achieved based on the cathode volume and weight,respectively.Moreover,with this efficient S/LiCoO_(2)cathode,the lithium corrosion by polysulfides is supressed,leading to a more stable lithium anode.展开更多
Solar energy is one of the most appealing clean energies to replace fossil fuel.However,the low power output is the bottleneck that hinders the effective usage of solar energy.Herein,we propose quasi-solid-state solar...Solar energy is one of the most appealing clean energies to replace fossil fuel.However,the low power output is the bottleneck that hinders the effective usage of solar energy.Herein,we propose quasi-solid-state solar rechargeable capacitors for solar energy multiplication effect and effective application based on Janus modified electrode.The power output of solar energy could be magnified by an integrated unit,which consists of the hydrogel electrolyte,asymmetrically lyophilic/lyophobic Janus joint electrode,and efficient perovskite solar cells.Benefiting from the unique Janus structure,the quasi-solid-state device is capable of achieving outstanding solar energy conversion,storage and utilization with large power output of 500 mW cm^-2,which is about 50 times higher than that of conventional solar cells.展开更多
基金supported by the National Key Research and Development Program(2016YFB0100500)the Fundamental Research Funds for the Central Universities of China.
文摘High-Ni layered oxide cathodes hold a great promise for fabricating highenergy lithium-ion batteries.However,the oxygen evolution during cycling is a crucial factor in the structure deterioration,potential change,and capacity decay of cathodes,limiting the commercial application of high-Ni(Ni>0.9)layered oxides in batteries.Herein,we demonstrate a feasible approach to enhance the stability of oxygen framework,through the surface oxygen immobilization with yttrium and bulk oxygen stabilization with aluminum in high-Ni layered oxides.As expected,benefiting from the oxygen-stabilized framework,the bulk structure deterioration,and interfacial parasitic reaction are mitigated obviously during battery operation,along with the improved thermal stability of cathode.Correspondingly,the as-prepared high-Ni oxide delivers high reversible capacity,impressive cycle ability,and low potential polarization upon cycling.Such significant improvement on the electrochemical performance is primarily attributed to the strong oxygen affinities of both yttrium at the surface layer and aluminum in the bulk,which synergistically stabilizes the oxygen framework of high-Ni oxide via raising the energy barrier for oxygen evolution.Therefore,building the stable oxygen framework is critical for enhancing the energy density output,cycle operation,and thermal stability of high-Ni oxide cathodes.
基金supported by the National Natural Science Foundation of China(Grant No.52102266,12204167)the China Postdoctoral Science Foundation(2020M680861)+4 种基金the support from the Department of Science and Technology-Science and Engineering Research Board(DST-SERB),Government of India(project no.SRG/2020/000258)CSIR-Indian Institute of Chemical Technology,Hyderabadsupported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.2022R1A5A1032539,2022R1C1C1008282)Industrial Strategic Technology Development Program-Alchemist Project(1415180859,Chiral perovskite LED smart contact lens based hyper vision metaverse)funded by the Ministry of Trade,Industry&Energy(MOTIE,Korea)Korea Evaluation Institute of Industrial Technology(KEIT,Korea).
文摘As lead halide perovskite(LHP)semiconductors have shown tremendous promise in many application fields,and particularly made strong impact in the solar photovoltaic area,low dimensional quantum dot forms of these perovskites are showing the potential to make distinct marks in the fields of electronics,optoelectronics and photonics.The so-called perovskite quantum dots(PQDs)not only possess the most important features of LHP materials,i.e.,the unusual high defect tolerance,but also demonstrate clear quantum size effects,along with exhibiting desirable optoelectronic properties such as near perfect photoluminescent quantum yield,multiple exciton generation and slow hot-carrier cooling.Here,we review the advantageous properties of these nanoscale perovskites and survey the prospects for diverse applications which include lightemitting devices,solar cells,photocatalysts,lasers,detectors and memristors,emphasizing the distinct superiorities as well as the challenges.
基金supported by the National Key Research and Development Program (2016YFB0100200)the National Natural Science Foundation of China (21935006 and 21421001)the Fundamental Research Funds for the Central Universities of China
文摘Although the gravimetric energy density of lithium-sulfur battery is very encouraging,the volumetric energy density still remains a challenge for the practical application.To achieve the high volumetric energy density of battery,much attention should be paid to the sulfur cathode.Herein,we introduce heavy lithium cobalt oxide(LiCoO_(2))nanofibers as sulfur host to enhance the volumetric capacity of cathode,maintaining the high gravimetric capacity simutaneously.With the high tap density of 2.26 g cm^(−3),LiCoO_(2)nanofibers can be used to fabricate a really compact sulfur cathode,with a density and porosity of 0.85 g cm^(−3)and 61.2%,respectively.More importantly,LiCoO2 nanofibers could act as an efficient electrocatalyst for enhancing the redox kinetics of sulfur species,ensuring the cathode electroactivity and alleviating the shuttle effect of polysulfides.Therefore,a balance between compact structure and high electrochemical activity is obtained for the sulfur cathode.At the sulfur loading of 5.1 mg cm^(−2),high volumetric and gravimetric capacities of 724 mA h cm^(−3)cathode and 848 mA h g^(−1)cathode could be achieved based on the cathode volume and weight,respectively.Moreover,with this efficient S/LiCoO_(2)cathode,the lithium corrosion by polysulfides is supressed,leading to a more stable lithium anode.
基金supported by the National Natural Science Foundation of China(21875123 and 21421001)。
文摘Solar energy is one of the most appealing clean energies to replace fossil fuel.However,the low power output is the bottleneck that hinders the effective usage of solar energy.Herein,we propose quasi-solid-state solar rechargeable capacitors for solar energy multiplication effect and effective application based on Janus modified electrode.The power output of solar energy could be magnified by an integrated unit,which consists of the hydrogel electrolyte,asymmetrically lyophilic/lyophobic Janus joint electrode,and efficient perovskite solar cells.Benefiting from the unique Janus structure,the quasi-solid-state device is capable of achieving outstanding solar energy conversion,storage and utilization with large power output of 500 mW cm^-2,which is about 50 times higher than that of conventional solar cells.
基金supported by the National Natural Science Foundation of China(21935006,22075151,and 22279064)the Fundamental Research Funds for the Central Universities of China.
