Anode-free all-solidstate batteries(AFASSBs)are potential candidates for next-generation electric mobility devices that offer superior energy density and stability by eliminating Li from the anode.However,despite its ...Anode-free all-solidstate batteries(AFASSBs)are potential candidates for next-generation electric mobility devices that offer superior energy density and stability by eliminating Li from the anode.However,despite its potential to stabilize the interface between sulfide solid electrolytes(SEs)and anode-free current collectors(CCs)efficiently,a controllable approach to incorporating MoS_(2)into AFASSBs has not yet been found.Herein,we propose a strategy for stabilizing the interface of Li-free all-solid-state batteries using controllable MoS_(2)sacrificial thin films.MoS_(2)was controllably grown on CCs by metal-organic chemical vapor deposition,and the MoS_(2)sacrificial layer in contact with the SEs formed an interlayer composed of Mo metal and Li_(2)S through a conversion reaction.In the AFASSBs with MoS_(2),Mo significantly reduces the nucleation overpotential of Li,which results in uniform Li plating.In addition,MoS_(2)-based Li_(2)S facilitates the formation of a uniform and robust SE interface,thereby enhancing the stability of AFASSBs.Based on these advantages,cells fabricated with MoS_(2)exhibited better performance as both asymmetrical and full cells with LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)cathodes than did cells without MoS_(2).Moreover,the cell performance was affected by the MoS_(2)size,and full cells having an optimal MoS_(2)thickness demonstrated a 1.18-fold increase in the initial discharge capacity and a sevenfold improvement in capacity retention relative to SUS CCs.This study offers a promising path for exploiting the full potential of MoS_(2)for interface stabilization and efficient AFASSB applications.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
基金supported by National Research Foundation of Korea (NRF) grants funded by the Korea government (MSIT)(RS-2022-NR072281)the financial support from the Development of Smart Chemical Materials for Io T Devices Project (KS2521-10) through the Korea Research Institute of Chemical Technologysupported by the National Research Foundation of the Republic of Korea (Project Nos. RS-2023-00217581 and RS-2024-00406724)
文摘Anode-free all-solidstate batteries(AFASSBs)are potential candidates for next-generation electric mobility devices that offer superior energy density and stability by eliminating Li from the anode.However,despite its potential to stabilize the interface between sulfide solid electrolytes(SEs)and anode-free current collectors(CCs)efficiently,a controllable approach to incorporating MoS_(2)into AFASSBs has not yet been found.Herein,we propose a strategy for stabilizing the interface of Li-free all-solid-state batteries using controllable MoS_(2)sacrificial thin films.MoS_(2)was controllably grown on CCs by metal-organic chemical vapor deposition,and the MoS_(2)sacrificial layer in contact with the SEs formed an interlayer composed of Mo metal and Li_(2)S through a conversion reaction.In the AFASSBs with MoS_(2),Mo significantly reduces the nucleation overpotential of Li,which results in uniform Li plating.In addition,MoS_(2)-based Li_(2)S facilitates the formation of a uniform and robust SE interface,thereby enhancing the stability of AFASSBs.Based on these advantages,cells fabricated with MoS_(2)exhibited better performance as both asymmetrical and full cells with LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)cathodes than did cells without MoS_(2).Moreover,the cell performance was affected by the MoS_(2)size,and full cells having an optimal MoS_(2)thickness demonstrated a 1.18-fold increase in the initial discharge capacity and a sevenfold improvement in capacity retention relative to SUS CCs.This study offers a promising path for exploiting the full potential of MoS_(2)for interface stabilization and efficient AFASSB applications.
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.
