The structural stress/strain induced by K-ion intercalation remains a critical challenge for K-ion batteries.To address this,a dopamine-intercalated WS_(2) hybrid(Dam-WS1.87)with a unique strain-self-relaxation archit...The structural stress/strain induced by K-ion intercalation remains a critical challenge for K-ion batteries.To address this,a dopamine-intercalated WS_(2) hybrid(Dam-WS1.87)with a unique strain-self-relaxation architecture was fabricated.Interestingly,the WS_(2) matrix undergoes a structural transformation owing to the intense infiltration effect of dopamine molecules,expanding interlayer spacing(0.813 nm)and introducing 6.5%S-vacancies while preserving high compaction density(4.0874 gcm^(-3)).The engineered structure demonstrates remarkable mechanical stability,exhibiting only 19.0%crystallite expansion upon full potassiation(vs.101.3%for pristine WS_(2)),demonstrating efficient strain alleviation through its strain-self-relaxation architecture.As a result,Dam-WS1.87delivers reversible capacities of 312.6 m A h g^(-1)/1277.7 mA h cm^(-3)at 0.125 C,along with superior rate capability(maintaining 210.4 m A h g^(-1)at 5 C)and unprecedented cycling stability(85.3%capacity retention after 1400 cycles at 1 C).This work provides new insights into designing strain-tolerant electrode materials for nextgeneration energy storage systems.展开更多
A heterostructure photodetector composed of few-layer NiPS_(3)/WS_(2)is made by using mechanical exfoliation and micro-nano fabrication techniques.The photodetector exhibits a broad-band response wavelengths of rangin...A heterostructure photodetector composed of few-layer NiPS_(3)/WS_(2)is made by using mechanical exfoliation and micro-nano fabrication techniques.The photodetector exhibits a broad-band response wavelengths of ranging of 405 nm and 800 nm.Under the light illumination of 405-nm wavelength and a bias voltage of-2V,the photoresponsivity is 62.6 m A/W and the specific detectivity is 8.59×10^(10)Jones.In addition,the device demonstrates a relatively fast response with rise and fall times of 70 ms and 120 ms.Theoretical calculation suggest that this excellent performance can be ascribed to the type-Ⅱband alignment at the NiPS_3/WS_2 heterostructure interface.展开更多
Constructing a nanostructure that combines abundant active edge sites with a well-designed heterostructure is an effective strategy for enhancing photocatalytic hydrogen generation.However,controllable approaches for ...Constructing a nanostructure that combines abundant active edge sites with a well-designed heterostructure is an effective strategy for enhancing photocatalytic hydrogen generation.However,controllable approaches for creating heterostructures based on vertically standing transition metal dichalcogenide(TMD)nanosheets remain insufficient despite their potential for efficient hydrogen production.In this paper,we present efficient photocatalysts featuring heterojunctions composed of vertically grown TMD(MoS_(2)and WS_(2))nanosheets.These structures(WS_(2),MoS_(2),and MoS_(2)/WS_(2)heterostructure)were fabricated using a controllable metal–organic chemical vapor deposition method,which expanded the surface area and facilitated effective photocatalytic hydrogen evolution.The vertical MoS_(2)/WS_(2)heterostructures demonstrated significantly enhanced hydrogen generation,driven by the synergistic effects of improved light absorption,a large specific surface area,and appropriately arranged staggered heterojunctions.Furthermore,the photocatalytic activity was considerably influenced by the size and density of the vertical nanosheets.Consequently,the nanosheet size-tailored MoS_(2)/WS_(2)heterostructure achieved a photocatalytic hydrogen generation rate(454.2μmol h^(–1) cm^(–2)),which is 2.02 times and 2.19 times higher than that of WS_(2)(225.6μmol h^(-1) cm^(-2))and MoS_(2)(207.2μmol h^(–1) cm^(–2)).Hence,the proposed strategy can be used to design staggered heterojunctions with edge-rich nanosheets for photocatalytic applications.展开更多
WS_(2),a two-dimensional layered material,is promising as sodium-ion batteries(SIBs)anode due to its large lnterlamellar spacing and high sodium storage capacity.However,its low electronic conductivity and high Na^(+)...WS_(2),a two-dimensional layered material,is promising as sodium-ion batteries(SIBs)anode due to its large lnterlamellar spacing and high sodium storage capacity.However,its low electronic conductivity and high Na^(+)adsorption energy hinder reaction kinetics.Here we demonstrate that substituting Se for part of the S in WS_(2)reduces interlayer Na^(+)adsorption and increases electronic conductivity.Based on this finding,lamellar WSSe,grown in situ on peanut shell-derived carbon(PSDC/WSSe),is elaborately designed as a highly stable SIB anode with a fast kinetic.PSDC/WSSe with carbon matrix and Se substitution simultaneously provides fast electron transport channels and lowered Na^(+)transport barriers(0.22 eV).The PSDC/WSSe anode offers a considerable reversible sodium storage capacity(288.0 mAh g^(-1)after 1000 cycles at 1.0 A g^(-1))and a fast kinetic reaction.A SIB full-cell using a PSDC/WSSe anode and Na_(3)V_(2)(PO_(4))_(3)cathode achieves a 215.4 Wh kg^(-1)high energy density,and successfully powers LEDs.This work offers new strategies to lower sodium ion transportation barrier in two-dimensional layered materials.展开更多
基金financially supported by the National Natural Science Foundation of China(22578493,22238012,52270115)the Beijing Nova Program(20240484570)+4 种基金the Postdoctoral Fellowship Program of CPSF(2024GZB20240847)the China Postdoctoral Science Foundation(M753609)the CNPC Innovation Found(2024DQ02-0206,2022DQ02-0410)the Science Foundation of China University of Petroleum(Beijing)(2462023QNXZ015,2462024PTJS011)the Open Project Fund of the Ministry of Education Engineering Research Center for Clean Low Carbon Energy(ZX20240167)。
文摘The structural stress/strain induced by K-ion intercalation remains a critical challenge for K-ion batteries.To address this,a dopamine-intercalated WS_(2) hybrid(Dam-WS1.87)with a unique strain-self-relaxation architecture was fabricated.Interestingly,the WS_(2) matrix undergoes a structural transformation owing to the intense infiltration effect of dopamine molecules,expanding interlayer spacing(0.813 nm)and introducing 6.5%S-vacancies while preserving high compaction density(4.0874 gcm^(-3)).The engineered structure demonstrates remarkable mechanical stability,exhibiting only 19.0%crystallite expansion upon full potassiation(vs.101.3%for pristine WS_(2)),demonstrating efficient strain alleviation through its strain-self-relaxation architecture.As a result,Dam-WS1.87delivers reversible capacities of 312.6 m A h g^(-1)/1277.7 mA h cm^(-3)at 0.125 C,along with superior rate capability(maintaining 210.4 m A h g^(-1)at 5 C)and unprecedented cycling stability(85.3%capacity retention after 1400 cycles at 1 C).This work provides new insights into designing strain-tolerant electrode materials for nextgeneration energy storage systems.
基金Project supported by the National Key Research and Development Program of China(Grant No.2022YFE0109200)the National Natural Science Foundation of China(Grant Nos.12074013 and 62175210)。
文摘A heterostructure photodetector composed of few-layer NiPS_(3)/WS_(2)is made by using mechanical exfoliation and micro-nano fabrication techniques.The photodetector exhibits a broad-band response wavelengths of ranging of 405 nm and 800 nm.Under the light illumination of 405-nm wavelength and a bias voltage of-2V,the photoresponsivity is 62.6 m A/W and the specific detectivity is 8.59×10^(10)Jones.In addition,the device demonstrates a relatively fast response with rise and fall times of 70 ms and 120 ms.Theoretical calculation suggest that this excellent performance can be ascribed to the type-Ⅱband alignment at the NiPS_3/WS_2 heterostructure interface.
基金supported by the Technology Innovation Program(RS-2024-00508071 and RS-2024-00416098)funded by the Ministry of Trade Industry&Energy(MOTIE,Korea)supported by the National Research Foundation of Korea(NRF)grants funded by the Korea government(MSIT)(RS-2022-NR072281)financial support from the Development of Smart Chemical Materials for IoT Devices Project(KS2521-10)through the Korea Research Institute of Chemical Technology.
文摘Constructing a nanostructure that combines abundant active edge sites with a well-designed heterostructure is an effective strategy for enhancing photocatalytic hydrogen generation.However,controllable approaches for creating heterostructures based on vertically standing transition metal dichalcogenide(TMD)nanosheets remain insufficient despite their potential for efficient hydrogen production.In this paper,we present efficient photocatalysts featuring heterojunctions composed of vertically grown TMD(MoS_(2)and WS_(2))nanosheets.These structures(WS_(2),MoS_(2),and MoS_(2)/WS_(2)heterostructure)were fabricated using a controllable metal–organic chemical vapor deposition method,which expanded the surface area and facilitated effective photocatalytic hydrogen evolution.The vertical MoS_(2)/WS_(2)heterostructures demonstrated significantly enhanced hydrogen generation,driven by the synergistic effects of improved light absorption,a large specific surface area,and appropriately arranged staggered heterojunctions.Furthermore,the photocatalytic activity was considerably influenced by the size and density of the vertical nanosheets.Consequently,the nanosheet size-tailored MoS_(2)/WS_(2)heterostructure achieved a photocatalytic hydrogen generation rate(454.2μmol h^(–1) cm^(–2)),which is 2.02 times and 2.19 times higher than that of WS_(2)(225.6μmol h^(-1) cm^(-2))and MoS_(2)(207.2μmol h^(–1) cm^(–2)).Hence,the proposed strategy can be used to design staggered heterojunctions with edge-rich nanosheets for photocatalytic applications.
基金financially supported by the Key R&D Plan of Shaanxi Province(Grant No.2023-YBGY-492)financial support from the Australian Research Councilthe QUT Capacity Building Professor Program。
文摘WS_(2),a two-dimensional layered material,is promising as sodium-ion batteries(SIBs)anode due to its large lnterlamellar spacing and high sodium storage capacity.However,its low electronic conductivity and high Na^(+)adsorption energy hinder reaction kinetics.Here we demonstrate that substituting Se for part of the S in WS_(2)reduces interlayer Na^(+)adsorption and increases electronic conductivity.Based on this finding,lamellar WSSe,grown in situ on peanut shell-derived carbon(PSDC/WSSe),is elaborately designed as a highly stable SIB anode with a fast kinetic.PSDC/WSSe with carbon matrix and Se substitution simultaneously provides fast electron transport channels and lowered Na^(+)transport barriers(0.22 eV).The PSDC/WSSe anode offers a considerable reversible sodium storage capacity(288.0 mAh g^(-1)after 1000 cycles at 1.0 A g^(-1))and a fast kinetic reaction.A SIB full-cell using a PSDC/WSSe anode and Na_(3)V_(2)(PO_(4))_(3)cathode achieves a 215.4 Wh kg^(-1)high energy density,and successfully powers LEDs.This work offers new strategies to lower sodium ion transportation barrier in two-dimensional layered materials.
