Reversible modulation of the transmittance in electrochromic devices(ECDs)holds tremendous potential for energy-saving windows.The choice of electrolyte significantly influences the optical modulation,coloring respons...Reversible modulation of the transmittance in electrochromic devices(ECDs)holds tremendous potential for energy-saving windows.The choice of electrolyte significantly influences the optical modulation,coloring response speed,coloring efficiency,and cycling stability of electrochromic devices.Moreover,traditional electrolytes are prone to instability under extreme temperature conditions,leading to device failure and severely limiting the widespread application of smart electrochromic windows.This study introduces LiCl water-in-salt electrolyte(WiSE)into tungsten oxide-based ECDs.LiCl WiSE exhibits wide-temperature tolerance and excellent ion conductivity.Therefore,the constructed tungsten oxide ECD demonstrates large optical modulation(76.2%@700 nm),fast response time(tc=2.0 s,tb=1.8 s),and high cycling stability(95.8%retention after 1000 cycles).Especially,it operates efficiently over a wide temperature range of-30~80℃.This research provides a new approach for electrolyte selection in the fabrication of high-performance,wide-temperature-tolerant ECDs.展开更多
As a core component in the electrochemical water splitting system,the cathode catalyst is capable of boosting the kinetics of the hydrogen evolution reaction(HER),while the scarcity and expenditure of current noble me...As a core component in the electrochemical water splitting system,the cathode catalyst is capable of boosting the kinetics of the hydrogen evolution reaction(HER),while the scarcity and expenditure of current noble metal-based electrocatalysts seriously restrict the large-scale commercial development of hydrogen manufacturing devices.Here,we present a robust and controllable self-assembly method for the spatial construction of three-dimensional(3D)porous ternary nanoarchitectures comprising Ti3C2Tx MXene,MoS2nanosheets,and graphene(MX/MoS2/G).This bottom-up strategy contributes to the intriguing structural features of the resulting nanoarchitectures,including 3D crosslinked porous networks,ultrathin walls,plentiful exposed reactive sites,and numerous efficient electron channels.As a consequence,the optimized MX/MoS2/G electrocatalyst depicts superior electrocatalytic HER performance in terms of a competitive onset potential,a small Tafel slope,a large electrochemically active surface area,and exceptional durability,which significantly outperforms the bare MXene,MoS2,graphene,as well as binary MXene/graphene and MoS2/graphene electrocatalysts.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.52102359,62305093,52172299 and 52462040)Hainan Provincial Natural Science Foundation of China(No.124RC438)+3 种基金Hainan Province“Nanhai New Star”Science and Technology Innovation Talent Platform Program(No.NHXXRCXM202304)the support from the External Cooperation Program of the Chinese Academy of Sciences(No.320GJHZ2023011MI)Suzhou Industrial Science and Technology Program(No.SYC2022036)High-end Talents Program of Jiangxi Province(No.jxsq2023101113)。
摘要Reversible modulation of the transmittance in electrochromic devices(ECDs)holds tremendous potential for energy-saving windows.The choice of electrolyte significantly influences the optical modulation,coloring response speed,coloring efficiency,and cycling stability of electrochromic devices.Moreover,traditional electrolytes are prone to instability under extreme temperature conditions,leading to device failure and severely limiting the widespread application of smart electrochromic windows.This study introduces LiCl water-in-salt electrolyte(WiSE)into tungsten oxide-based ECDs.LiCl WiSE exhibits wide-temperature tolerance and excellent ion conductivity.Therefore,the constructed tungsten oxide ECD demonstrates large optical modulation(76.2%@700 nm),fast response time(tc=2.0 s,tb=1.8 s),and high cycling stability(95.8%retention after 1000 cycles).Especially,it operates efficiently over a wide temperature range of-30~80℃.This research provides a new approach for electrolyte selection in the fabrication of high-performance,wide-temperature-tolerant ECDs.
基金financially supported by the National Natural Science Foundation of China(Grant Nos.22209037 and 52472092)。
摘要As a core component in the electrochemical water splitting system,the cathode catalyst is capable of boosting the kinetics of the hydrogen evolution reaction(HER),while the scarcity and expenditure of current noble metal-based electrocatalysts seriously restrict the large-scale commercial development of hydrogen manufacturing devices.Here,we present a robust and controllable self-assembly method for the spatial construction of three-dimensional(3D)porous ternary nanoarchitectures comprising Ti3C2Tx MXene,MoS2nanosheets,and graphene(MX/MoS2/G).This bottom-up strategy contributes to the intriguing structural features of the resulting nanoarchitectures,including 3D crosslinked porous networks,ultrathin walls,plentiful exposed reactive sites,and numerous efficient electron channels.As a consequence,the optimized MX/MoS2/G electrocatalyst depicts superior electrocatalytic HER performance in terms of a competitive onset potential,a small Tafel slope,a large electrochemically active surface area,and exceptional durability,which significantly outperforms the bare MXene,MoS2,graphene,as well as binary MXene/graphene and MoS2/graphene electrocatalysts.