Direct conversion of the tremendous and ubiquitous low-grade thermal energy into electricity by thermogalvanic cells is a promising strategy for energy harvesting.The environment is one of the richest and renewable lo...Direct conversion of the tremendous and ubiquitous low-grade thermal energy into electricity by thermogalvanic cells is a promising strategy for energy harvesting.The environment is one of the richest and renewable low-grade thermal source.However,critical challenges remain for all-day electricity generation from environmental thermal energy due to the low frequency and small amplitude of temperature fluctuations in the environment.In this work,we report a tandem device consisting of a polypyrrole(PPy)broadband absorber/radiator,thermogalvanic cell,and thermal storage material(Cu foam/PEG1000)that integrates multiple functions of heating,cooling,and recycling of thermal energy.The thermogalvanic cell enables continuous utilization of environmental thermal energy at both daytime and nighttime,yielding maximum outputs as high as 0.6 W m^(-2) and 53 mW m^(-2),respectively.As demonstrated outdoors by a large-scale prototype module,this design offers a feasible and promising approach to all-day electricity generation from environmental thermal energy.展开更多
Two-dimensional(2D)single-layer δ-MnO_(2)(SLMO)with cations intercalated in the interlayers demonstrates specific structural characteristics,possessing superiority in the fields such as energy storage,catalysis,and s...Two-dimensional(2D)single-layer δ-MnO_(2)(SLMO)with cations intercalated in the interlayers demonstrates specific structural characteristics,possessing superiority in the fields such as energy storage,catalysis,and sensor.However,the synthesis technology of large-lateral-size SLMO nanosheets with high uniformity is rare,which hinders their correlated research.Herein,we report an intercalation-assisted exfoliation approach to produce large-sized SLMO nanosheets with high dispersity in aqueous solution.Few-layer K^(+)-intercalated δ-MnO_(2)(KMnO)nanosheets were used as a precursor to ensure complete exfoliation.On account of high dispersion and ultrathin 2D morphology,SLMO nanosheets self-assembled into a flexible and free-standing film to construct ordered nanochannels.A high surface charge density of 1.71 mC m^(-2) and proton mobility of 2.59×10^(-3) cm^(2) V^(-1) s_(-1) were achieved in the free-standing SLMO film.With the extraordinary properties and easily scaled fabrication of the 2D SLMO film,this approach will pave the way for the study of confined ion transportation and enable the easy construction of nanofluidic devices.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(grants 51872101,51672097,and 61434001)the National Program for Support of TopNotch Young Professionals,the programme for HUST Academic Frontier Youth Team(2017QYTD11)+2 种基金the China Postdoctoral Science Foundation(2017M61048 and 2018T110758)the Fundamental Research Funds for the Central Universities(HUST:2015MS004 and 2018KFYXKJC025)The authors thank the Center for Nanoscale Characterization&Devices,WNLO-HUST,and the Analysis and Testing Center of Huazhong University of Science and Technology for their support.
文摘Direct conversion of the tremendous and ubiquitous low-grade thermal energy into electricity by thermogalvanic cells is a promising strategy for energy harvesting.The environment is one of the richest and renewable low-grade thermal source.However,critical challenges remain for all-day electricity generation from environmental thermal energy due to the low frequency and small amplitude of temperature fluctuations in the environment.In this work,we report a tandem device consisting of a polypyrrole(PPy)broadband absorber/radiator,thermogalvanic cell,and thermal storage material(Cu foam/PEG1000)that integrates multiple functions of heating,cooling,and recycling of thermal energy.The thermogalvanic cell enables continuous utilization of environmental thermal energy at both daytime and nighttime,yielding maximum outputs as high as 0.6 W m^(-2) and 53 mW m^(-2),respectively.As demonstrated outdoors by a large-scale prototype module,this design offers a feasible and promising approach to all-day electricity generation from environmental thermal energy.
基金financially supported by the National Natural Science Foundation of China(51872101,51602115,and 61434001)the National Program for Support of Top-notch Young Professionals+1 种基金the Program for HUST Academic Frontier Youth Teamthe Director Fund of WNLO。
文摘Two-dimensional(2D)single-layer δ-MnO_(2)(SLMO)with cations intercalated in the interlayers demonstrates specific structural characteristics,possessing superiority in the fields such as energy storage,catalysis,and sensor.However,the synthesis technology of large-lateral-size SLMO nanosheets with high uniformity is rare,which hinders their correlated research.Herein,we report an intercalation-assisted exfoliation approach to produce large-sized SLMO nanosheets with high dispersity in aqueous solution.Few-layer K^(+)-intercalated δ-MnO_(2)(KMnO)nanosheets were used as a precursor to ensure complete exfoliation.On account of high dispersion and ultrathin 2D morphology,SLMO nanosheets self-assembled into a flexible and free-standing film to construct ordered nanochannels.A high surface charge density of 1.71 mC m^(-2) and proton mobility of 2.59×10^(-3) cm^(2) V^(-1) s_(-1) were achieved in the free-standing SLMO film.With the extraordinary properties and easily scaled fabrication of the 2D SLMO film,this approach will pave the way for the study of confined ion transportation and enable the easy construction of nanofluidic devices.
