Lithium–sulfur batteries have received extensive attention owing to abundant sulfur resources and high energy density.However,their practical applications are hindered by the low utilization of sulfur due to its poor...Lithium–sulfur batteries have received extensive attention owing to abundant sulfur resources and high energy density.However,their practical applications are hindered by the low utilization of sulfur due to its poor electronic conductivity,the shuttle effect and the sluggish redox kinetics of soluble lithium polysulfides(LiPSs),thus resulting in severe fading capacity.In study,graphene decorated with hetero-Co_(9)S_(8)–NiS sheets(BMS-G)was employed as a host material to support S in cathodes.The hetero-Co_(9)S_(8)–NiS effectively confined numerous LiPS species by chemisorption,and expedited the redox kinetics of LiPS.Consequently,the cathode with the BMS-G composite delivered high reversible specific capacities of 1142.9 mA h g^(−1) at 0.2 C and 705.8 mA h g^(−1) at 2 C,and had an excellent cycling stability(only 0.031%capacity fading per cycle over 800 cycles at 1 C was observed).展开更多
Bioelectrical signals,especially electroencephalography(EEG)and electrocardiography(ECG),are indispensable for health assessment.However,achieving high-quality signal acquisition while ensuring long-term stability rem...Bioelectrical signals,especially electroencephalography(EEG)and electrocardiography(ECG),are indispensable for health assessment.However,achieving high-quality signal acquisition while ensuring long-term stability remains a significant challenge in the bioelectrical electrodes.Herein,a cholinium-based eutectogel(ChCl-egel)is reported for dynamic ECG and EEG monitoring.By utilizing hydrogen bonding of deep eutectic solvents(DESs)to modulate conductivity,the ChCl-egel realizes an ultra-low skin impedance(4.7 kΩat 10 Hz)with reliable stability.Additionally,the ChCl-egel exhibits excellent conformal contact and biocompatibility.During ECG monitoring,the ChCl-egel offers an 8 dB improvement in signal-to-noise ratio(SNR)compared to commercial ECG electrodes(3 M,Red Dot)over 48-hour period,enabling dynamic record under high-intensity exercises.In an 18-hour steadystate visual evoked potential(SSVEP)experiment,it can match the scalp impedance of commercial gel and support longer record.With high-quality dynamic monitoring capability,the ChCl-egel provides a promising solution for long-term bioelectrical signal acquisition.展开更多
基金financial supported by the National Natural Science Foundation of China(No.51802029,51874362)Natural Science Foundation of Hunan Province,China(No.2018JJ1036,2017JJ3343)Scientific Research Fund of Hunan Provincial Education Department(No.17B028).
文摘Lithium–sulfur batteries have received extensive attention owing to abundant sulfur resources and high energy density.However,their practical applications are hindered by the low utilization of sulfur due to its poor electronic conductivity,the shuttle effect and the sluggish redox kinetics of soluble lithium polysulfides(LiPSs),thus resulting in severe fading capacity.In study,graphene decorated with hetero-Co_(9)S_(8)–NiS sheets(BMS-G)was employed as a host material to support S in cathodes.The hetero-Co_(9)S_(8)–NiS effectively confined numerous LiPS species by chemisorption,and expedited the redox kinetics of LiPS.Consequently,the cathode with the BMS-G composite delivered high reversible specific capacities of 1142.9 mA h g^(−1) at 0.2 C and 705.8 mA h g^(−1) at 2 C,and had an excellent cycling stability(only 0.031%capacity fading per cycle over 800 cycles at 1 C was observed).
基金supported by the National Science and Technology Major Project Fund of China under Grant 2025ZD0215600the General Program of Natural Science Foundation of Beijing Grants No.7242271+5 种基金the National Natural Science Foundation of China(NSFC)under grant No.92472106,52325312,52421001,52388201Beijing Municipal Science&Technology Commission,Administrative Commission of Zhongguancun Science Park,under grant No.Z231100006023020Youth Program of NSFC Grants No.12102224Shanghai Special Fund for Industrial High Quality Development:Pioneering Industries Innovation and Development Projects Grants No.2024-GZL-RGZN-02026Beijing University of Posts and Telecommunications Excellent Ph.D.Students Foundation(grant No.CX20241089)the Start-up Funding of Beijing University of Posts and Telecommunications(grant No.500422817 and 510224039).
文摘Bioelectrical signals,especially electroencephalography(EEG)and electrocardiography(ECG),are indispensable for health assessment.However,achieving high-quality signal acquisition while ensuring long-term stability remains a significant challenge in the bioelectrical electrodes.Herein,a cholinium-based eutectogel(ChCl-egel)is reported for dynamic ECG and EEG monitoring.By utilizing hydrogen bonding of deep eutectic solvents(DESs)to modulate conductivity,the ChCl-egel realizes an ultra-low skin impedance(4.7 kΩat 10 Hz)with reliable stability.Additionally,the ChCl-egel exhibits excellent conformal contact and biocompatibility.During ECG monitoring,the ChCl-egel offers an 8 dB improvement in signal-to-noise ratio(SNR)compared to commercial ECG electrodes(3 M,Red Dot)over 48-hour period,enabling dynamic record under high-intensity exercises.In an 18-hour steadystate visual evoked potential(SSVEP)experiment,it can match the scalp impedance of commercial gel and support longer record.With high-quality dynamic monitoring capability,the ChCl-egel provides a promising solution for long-term bioelectrical signal acquisition.
