Soft actuators endowed with self-sensing capability become highly sought after in recent years.Ti_(3)C_(2)Tx MXene is expected to be used in the development of self-sensing actuators due to its outstanding physical an...Soft actuators endowed with self-sensing capability become highly sought after in recent years.Ti_(3)C_(2)Tx MXene is expected to be used in the development of self-sensing actuators due to its outstanding physical and chemical properties.However,achieving precise deformation feedback of MXene-based actuators remains a challenge,as the resistance change of MXene is not only affected by deformation,but also by temperature,and the decoupling is difficult.Here,a composite ink with temperature self-compensation(0.00125%·°C^(−1) of temperature coefficient of resistance)is fabricated by combining MXene and graphite with opposite temperature coefficients of resistance.The composite ink can be written on a variety of substrates,including glass,cellulose paper,and various polymers.Based on this,an ink-cellulose/polymer composite actuator with self-sensing function is actualized.The actuator can achieve accurate real-time deformation feedback by monitoring the resistance signal of ink-cellulose layer,which shows a high linear sensitivity(gauge factor~14.5,coefficient of determination(R^(2))>0.99),thereby realizing the perception of touch behavior and distinguishing objects with different weights,softness,and roughness.Besides,a series of biomimetic devices and soft robots with programmable movements(rolling and self-sustained oscillating)are also demonstrated.The results offer new insights for the development of the self-sensing actuators.展开更多
For a birth and death processX=|X(t),t <σ| with explosion and lifespanu distributions and joint distributions of first hitting time and first hitting location after explosion of setB n = |0,1,...,n| ,n have been f...For a birth and death processX=|X(t),t <σ| with explosion and lifespanu distributions and joint distributions of first hitting time and first hitting location after explosion of setB n = |0,1,...,n| ,n have been found.展开更多
Single wall carbon nanotube(SWCNT)additives were formulated into(im-Si-graphite composite electrodes and tested in both half cells and full cells with high nickel cathodes.The critical role of small amount of SWCNT ad...Single wall carbon nanotube(SWCNT)additives were formulated into(im-Si-graphite composite electrodes and tested in both half cells and full cells with high nickel cathodes.The critical role of small amount of SWCNT addition(0.2 wt%)was found for significantly improving delithiation capacity,first cycle coulombic efficiency(FCE),and capacity retention.Particularly,Si(10 wt%)-graphite electrode exhibits 560 mAh/g delithiation capacity and 92%FCE at 0.2 C during the first chargedischarge cycle,and 91%capacity retention after 50 cycles(0.5 C)in a half cell.Scanning electron microscope(SEM)was used to illustrate the electrode morphology,compositions and promoting function of the SWCNT additives.In addition,full cells assembled with high nickel-NCM811 cathodes and fim-Si-graphite composite anodes were evaluated for the consistence between half and full cell performance,and the consideration for potential commercial application.Finally,criteria to assess Si-containing anodes are proposed and discussed from an industrial perspective.展开更多
Methane production from low-strength wastewater （LSWW） is generally difficult because of the low metabolism rate of methanogens. Here, an up-flow biofilm reactor equipped with conductive granular graphite （GG） as ...Methane production from low-strength wastewater （LSWW） is generally difficult because of the low metabolism rate of methanogens. Here, an up-flow biofilm reactor equipped with conductive granular graphite （GG） as fillers was developed to enhance direct interspecies electron transfer （DIET） between syntrophie electroactive bacteria and methanogens to stimulate methanogcnesis process. Compared to quartz sand fillers, using condnctive fillers significantly enhanced methane production and accelerated the start-up stage ofbJ.ofilm reactor. At HRT of 6 h, the average methane production rate and methane yield of reactor with GG were 0.106 m3/（m3.d） and 74.5 L/kg COD, which increased by 34.3 times and 22.4 times respectively compared with the reactor with common quartz sand fillers. The microbial cornmunity analysis revealed that methanogens structure was significantly altered and the archaea that are involved in DIET （such as Methanohacterium） were enriched in GG fillet- The beneficial effects ot conductive fillers on methane production implied a practical strategy tbr efficient methane recovery from LSWW.展开更多
基金supported by the National Key R&D Program of China(NO.2024YFB3409900)the China Postdoctoral Science Foundation(No.2023M730845)the Heilongjiang Postdoctoral Fund(No.LBH-Z23182).
文摘Soft actuators endowed with self-sensing capability become highly sought after in recent years.Ti_(3)C_(2)Tx MXene is expected to be used in the development of self-sensing actuators due to its outstanding physical and chemical properties.However,achieving precise deformation feedback of MXene-based actuators remains a challenge,as the resistance change of MXene is not only affected by deformation,but also by temperature,and the decoupling is difficult.Here,a composite ink with temperature self-compensation(0.00125%·°C^(−1) of temperature coefficient of resistance)is fabricated by combining MXene and graphite with opposite temperature coefficients of resistance.The composite ink can be written on a variety of substrates,including glass,cellulose paper,and various polymers.Based on this,an ink-cellulose/polymer composite actuator with self-sensing function is actualized.The actuator can achieve accurate real-time deformation feedback by monitoring the resistance signal of ink-cellulose layer,which shows a high linear sensitivity(gauge factor~14.5,coefficient of determination(R^(2))>0.99),thereby realizing the perception of touch behavior and distinguishing objects with different weights,softness,and roughness.Besides,a series of biomimetic devices and soft robots with programmable movements(rolling and self-sustained oscillating)are also demonstrated.The results offer new insights for the development of the self-sensing actuators.
文摘For a birth and death processX=|X(t),t <σ| with explosion and lifespanu distributions and joint distributions of first hitting time and first hitting location after explosion of setB n = |0,1,...,n| ,n have been found.
文摘Single wall carbon nanotube(SWCNT)additives were formulated into(im-Si-graphite composite electrodes and tested in both half cells and full cells with high nickel cathodes.The critical role of small amount of SWCNT addition(0.2 wt%)was found for significantly improving delithiation capacity,first cycle coulombic efficiency(FCE),and capacity retention.Particularly,Si(10 wt%)-graphite electrode exhibits 560 mAh/g delithiation capacity and 92%FCE at 0.2 C during the first chargedischarge cycle,and 91%capacity retention after 50 cycles(0.5 C)in a half cell.Scanning electron microscope(SEM)was used to illustrate the electrode morphology,compositions and promoting function of the SWCNT additives.In addition,full cells assembled with high nickel-NCM811 cathodes and fim-Si-graphite composite anodes were evaluated for the consistence between half and full cell performance,and the consideration for potential commercial application.Finally,criteria to assess Si-containing anodes are proposed and discussed from an industrial perspective.
基金This research was supported by the National Natural Science Foundation of China （Grant No. 51578534）, and Youth Innovation Promotion Association CAS （No. 2017062）.
文摘Methane production from low-strength wastewater （LSWW） is generally difficult because of the low metabolism rate of methanogens. Here, an up-flow biofilm reactor equipped with conductive granular graphite （GG） as fillers was developed to enhance direct interspecies electron transfer （DIET） between syntrophie electroactive bacteria and methanogens to stimulate methanogcnesis process. Compared to quartz sand fillers, using condnctive fillers significantly enhanced methane production and accelerated the start-up stage ofbJ.ofilm reactor. At HRT of 6 h, the average methane production rate and methane yield of reactor with GG were 0.106 m3/（m3.d） and 74.5 L/kg COD, which increased by 34.3 times and 22.4 times respectively compared with the reactor with common quartz sand fillers. The microbial cornmunity analysis revealed that methanogens structure was significantly altered and the archaea that are involved in DIET （such as Methanohacterium） were enriched in GG fillet- The beneficial effects ot conductive fillers on methane production implied a practical strategy tbr efficient methane recovery from LSWW.
