Harvesting energy from humid air to generate electricity represents a promising strategy for sustainable power generation.However,achieving high output and long-term stability in moisture-driven power generators(MPGs)...Harvesting energy from humid air to generate electricity represents a promising strategy for sustainable power generation.However,achieving high output and long-term stability in moisture-driven power generators(MPGs)remains a significant challenge.Here,we develop an efficient MPG by incorporating polymerized ionic liquid(PIL)and MXene through in-situ polymerization of cationic long chains within the MXene layers.This structural design enhances the hydrophilicity and ion dynamics,ensuring stable and sustained electrical output.A single MPG device delivers an open-circuit voltage of 0.65 V and a power density of 14.87 mW·cm^(-2),operating continuously for over 36 h.Surface characterization and quantum chemistry calculations elucidate that the mobile anions within the MPG move directionally under moisture gradients,while polymerized cations remain stationary,driving power generation.The MPG exhibits exceptional long-term stability,retaining about 80%of its initial voltage output after 30 days.Moreover,these MPGs demonstrate scalability for practical applications,capable of efficiently charging capacitors and powering LEDs through simple series-parallel configurations.This work offers a promising strategy to simultaneously enhance the performance and operational stability of MPGs,offering a sustainable solution for the direct conversion of low-grade thermal energy from moisture into clean electricity.展开更多
The emergence of novel self-powered humidity sensors has attracted considerable attention in the fields of smart electronic devices and personal healthcare.Herein,self-powered humidity sensors have been fabricated usi...The emergence of novel self-powered humidity sensors has attracted considerable attention in the fields of smart electronic devices and personal healthcare.Herein,self-powered humidity sensors have been fabricated using a moisture-driven energy generation(MEG)device based on asymmetric tubular graphitic carbon nitride(g-CN)films prepared on anodized aluminum(AAO)template.At a relative humidity(RH)of 96%,the MEG device can provide an open-circuit voltage of 0.47 V and a short-circuit current of 3.51μA,with a maximum output power of 0.08μW.With inherent self-powered ability and humidity response via current variation,an extraordinary response of 1.78×106%(41%-96%RH)can be gained from the MEG device.The possible power generation mechanism is that g-CN/AAO heterostructure can form ion gradient and diffusion under the action of moisture to convert chemical potential into electrical potential,evoking a connaturally sensitive response to humidity.Self-powered respiration monitoring device based on the sensor is designed to monitor human movement(sitting,warming up,and running)and sleep status(normal,snoring,and apnea),maintaining excellent stability during cumulative 12-h respiration monitoring.This self-powered humidity sensing technology has promising potential for extensive integration into smart electronic and round-the-clock health monitoring devices.展开更多
基金the National Natural Science Foundation of China(22278401 and 92163209)the ANSO Collaborative Research Program(ANSO-CR-KP-2022-12)+2 种基金Beijing Natural Science Foundation(2252011 and JQ22004)Beijing Nova Program(20230484478)for financial supportsupported by Public Computing Cloud,Renmin University of China.
文摘Harvesting energy from humid air to generate electricity represents a promising strategy for sustainable power generation.However,achieving high output and long-term stability in moisture-driven power generators(MPGs)remains a significant challenge.Here,we develop an efficient MPG by incorporating polymerized ionic liquid(PIL)and MXene through in-situ polymerization of cationic long chains within the MXene layers.This structural design enhances the hydrophilicity and ion dynamics,ensuring stable and sustained electrical output.A single MPG device delivers an open-circuit voltage of 0.65 V and a power density of 14.87 mW·cm^(-2),operating continuously for over 36 h.Surface characterization and quantum chemistry calculations elucidate that the mobile anions within the MPG move directionally under moisture gradients,while polymerized cations remain stationary,driving power generation.The MPG exhibits exceptional long-term stability,retaining about 80%of its initial voltage output after 30 days.Moreover,these MPGs demonstrate scalability for practical applications,capable of efficiently charging capacitors and powering LEDs through simple series-parallel configurations.This work offers a promising strategy to simultaneously enhance the performance and operational stability of MPGs,offering a sustainable solution for the direct conversion of low-grade thermal energy from moisture into clean electricity.
基金the National Natural Science Foundation of China(Nos.12261141661,12074348,U2004168,U21A2070,62027816,and 12004345)the Natural Science Foundation of Henan Province(No.212300410078).
文摘The emergence of novel self-powered humidity sensors has attracted considerable attention in the fields of smart electronic devices and personal healthcare.Herein,self-powered humidity sensors have been fabricated using a moisture-driven energy generation(MEG)device based on asymmetric tubular graphitic carbon nitride(g-CN)films prepared on anodized aluminum(AAO)template.At a relative humidity(RH)of 96%,the MEG device can provide an open-circuit voltage of 0.47 V and a short-circuit current of 3.51μA,with a maximum output power of 0.08μW.With inherent self-powered ability and humidity response via current variation,an extraordinary response of 1.78×106%(41%-96%RH)can be gained from the MEG device.The possible power generation mechanism is that g-CN/AAO heterostructure can form ion gradient and diffusion under the action of moisture to convert chemical potential into electrical potential,evoking a connaturally sensitive response to humidity.Self-powered respiration monitoring device based on the sensor is designed to monitor human movement(sitting,warming up,and running)and sleep status(normal,snoring,and apnea),maintaining excellent stability during cumulative 12-h respiration monitoring.This self-powered humidity sensing technology has promising potential for extensive integration into smart electronic and round-the-clock health monitoring devices.
