Flexible supercapacitors(SCs)have become a popular research topic due to their extra-long service life,foldability,and wearability.Nevertheless,their low energy density restricts their applications.Here,we synthesized...Flexible supercapacitors(SCs)have become a popular research topic due to their extra-long service life,foldability,and wearability.Nevertheless,their low energy density restricts their applications.Here,we synthesized phosphorus-doped bimetallic sulfides embedded in heteroatom-doped(N,S,and P)carbon shells(P-ZCS/HC)using a simple approach to create high-performance flexible electrodes.The three-dimensional architecture made by interlaced nanosheets was preserved,and raised nanoparticles appeared on the rough surface during the annealing operation,increasing the specific surface area and potential exposure to the electrolyte.It is noteworthy that the optimal P-ZCS/HC electrode possessed a remarkable capacity of 1080 C g^(-1)at 1 A g^(-1)along with superb cycling stability.These extraordinary properties were primarily caused by plentiful redox reactions,enhanced conductivity,and synergic effects of the P-doped metal sulfides and heteroatom-doped carbon shells.Density functional theory simulations confirmed the good function of the P-doped electrodes and their ability to boost conductivity,improve reactive dynamics,and promote OH-adsorption.Notably,the assembled all-solid-state hybrid SC exhibited a maximum energy density of 62.9 W h kg^(-1)and a power density of 16 k W kg^(-1),while being able to maintain 92.0%of its initial capacity after 10,000 cycles.This systematic report provides new insight into the design and synthesis of electrodes with complex components and outstanding structures for the flexible energy field.展开更多
Hydrogen storage under moderate pressure (～10 MPa) and ambient temperature (～25°C) in multi-walled carbon nanotubes (MWNTs) prepared by the floating catalyst method is investigated. The capacity of hydrogen ads...Hydrogen storage under moderate pressure (～10 MPa) and ambient temperature (～25°C) in multi-walled carbon nanotubes (MWNTs) prepared by the floating catalyst method is investigated. The capacity of hydrogen adsorption is evaluated based on both the nanotubes diameter and morphology. Indirect evidence indicates that hydrogen adsorption not only occurs on tube surface and interiors, but also in tube interlayers. The results show that the floating catalytic carbon nanotubes might be a candidate hydrogen storage material for fuel cell electric vehicles.展开更多
As one of the most promising next-generation energy storage devices,the lithium-metal battery has been extensively investigated.However,safety issues and undesired lithium dendrite growth hinder its development.The ap...As one of the most promising next-generation energy storage devices,the lithium-metal battery has been extensively investigated.However,safety issues and undesired lithium dendrite growth hinder its development.The application of solid-state electrolytes has attracted increasing attention as they can solve safety issues and show great potential to inhibit the growth of lithium dendrites.Polyethylene oxide(PEO)-based electrolytes are very promising due to their enhanced safety and excellent flexibility.However,they suffer from low ionic conductivity at room temperature and cannot effectively inhibit lithium dendrites at high temperatures due to the intrinsic semicrystalline properties and poor mechanical strength.In this work,a novel coral-like Li_(6.25)Al_(0.25)La_(3)Zr_(2)O_(12)(C-LALZO)is synthesized to serve as an active ceramic filler in PEO.The PEO with LALZO coral(PLC)exhibits increased ionic conductivity and mechanical strength,which leads to uniform deposition/stripping of lithium metal.The Li symmetric cells with PLC do not cause a short circuit after cycling for 1500 h at 60℃.The assembled LiFePO_(4)/PLC/Li batteries display excellent cycling stability at both 60 and 50℃.This work reveals that the electrochemical properties of the composite electrolyte can be effectively improved by tuning the microstructure of the filler,such as the C-LALZO architecture.展开更多
Biomimetics,a term defined by Schmitt in 1960s,has been accompanying the development of humanity in learning from nature to solve problems over billions of years.The nature-inspired artificial design has driven innova...Biomimetics,a term defined by Schmitt in 1960s,has been accompanying the development of humanity in learning from nature to solve problems over billions of years.The nature-inspired artificial design has driven innovative research across various disciplines,especially materials science,which is the foundation for other biomimetic fields like medicine,robotics,bioelectronics,self-cleaning,catalysts and energy-related devices[1-3].展开更多
基金supported by research projects from the Department of Science and Technology of Shandong Province (2018JMRH0211, ZR2019MEM052, 2019TSLH0101 and ZR2018ZB0105)the Fundamental Research Funds of Shandong University (2017JC042 and 2017JC010)supported by a Welch Foundation grant (C-1716)
文摘Flexible supercapacitors(SCs)have become a popular research topic due to their extra-long service life,foldability,and wearability.Nevertheless,their low energy density restricts their applications.Here,we synthesized phosphorus-doped bimetallic sulfides embedded in heteroatom-doped(N,S,and P)carbon shells(P-ZCS/HC)using a simple approach to create high-performance flexible electrodes.The three-dimensional architecture made by interlaced nanosheets was preserved,and raised nanoparticles appeared on the rough surface during the annealing operation,increasing the specific surface area and potential exposure to the electrolyte.It is noteworthy that the optimal P-ZCS/HC electrode possessed a remarkable capacity of 1080 C g^(-1)at 1 A g^(-1)along with superb cycling stability.These extraordinary properties were primarily caused by plentiful redox reactions,enhanced conductivity,and synergic effects of the P-doped metal sulfides and heteroatom-doped carbon shells.Density functional theory simulations confirmed the good function of the P-doped electrodes and their ability to boost conductivity,improve reactive dynamics,and promote OH-adsorption.Notably,the assembled all-solid-state hybrid SC exhibited a maximum energy density of 62.9 W h kg^(-1)and a power density of 16 k W kg^(-1),while being able to maintain 92.0%of its initial capacity after 10,000 cycles.This systematic report provides new insight into the design and synthesis of electrodes with complex components and outstanding structures for the flexible energy field.
基金This work was supported by the State Key Program for Fundamental Research of MOST, China (Grant No. G20000264-04).
文摘Hydrogen storage under moderate pressure (～10 MPa) and ambient temperature (～25°C) in multi-walled carbon nanotubes (MWNTs) prepared by the floating catalyst method is investigated. The capacity of hydrogen adsorption is evaluated based on both the nanotubes diameter and morphology. Indirect evidence indicates that hydrogen adsorption not only occurs on tube surface and interiors, but also in tube interlayers. The results show that the floating catalytic carbon nanotubes might be a candidate hydrogen storage material for fuel cell electric vehicles.
基金supported by the School Research Startup Expenses of Harbin Institute of Technology(Shenzhen)(DD29100027)the National Natural Science Foundation of China(52002094)+2 种基金China Postdoctoral Science Foundation(2019M661276)Guangdong Basic and AppliedBasic Research Foundation(2019A1515110756)the High-level Talents Discipline Construction Fund of Shandong University(31370089963078)。
文摘As one of the most promising next-generation energy storage devices,the lithium-metal battery has been extensively investigated.However,safety issues and undesired lithium dendrite growth hinder its development.The application of solid-state electrolytes has attracted increasing attention as they can solve safety issues and show great potential to inhibit the growth of lithium dendrites.Polyethylene oxide(PEO)-based electrolytes are very promising due to their enhanced safety and excellent flexibility.However,they suffer from low ionic conductivity at room temperature and cannot effectively inhibit lithium dendrites at high temperatures due to the intrinsic semicrystalline properties and poor mechanical strength.In this work,a novel coral-like Li_(6.25)Al_(0.25)La_(3)Zr_(2)O_(12)(C-LALZO)is synthesized to serve as an active ceramic filler in PEO.The PEO with LALZO coral(PLC)exhibits increased ionic conductivity and mechanical strength,which leads to uniform deposition/stripping of lithium metal.The Li symmetric cells with PLC do not cause a short circuit after cycling for 1500 h at 60℃.The assembled LiFePO_(4)/PLC/Li batteries display excellent cycling stability at both 60 and 50℃.This work reveals that the electrochemical properties of the composite electrolyte can be effectively improved by tuning the microstructure of the filler,such as the C-LALZO architecture.
基金supported by the National Natural Science Foundation of China(52002094)School Research Startup Expenses of Harbin Institute of Technology(Shenzhen)(DD29100027)。
文摘Biomimetics,a term defined by Schmitt in 1960s,has been accompanying the development of humanity in learning from nature to solve problems over billions of years.The nature-inspired artificial design has driven innovative research across various disciplines,especially materials science,which is the foundation for other biomimetic fields like medicine,robotics,bioelectronics,self-cleaning,catalysts and energy-related devices[1-3].
