Converting low-grade waste heat into usable electricity and storing it simultaneously requires a new technology that realize the directional migration of electrons or ions under temperature difference and enrichment o...Converting low-grade waste heat into usable electricity and storing it simultaneously requires a new technology that realize the directional migration of electrons or ions under temperature difference and enrichment on the electrodes.Although the urgent demand of energy conversion-storage(ECS)has emerged in the field of wearable electronic,achieving the integrated bi-functional device remains challenge due to the different mechanisms of electrical transportation and storage.Here,we report an ionic thermoelectric supercapacitor that relies on the synergistic functions of thermoelectricity and supercapacitor in the thermoelectric ionogel electrolyte and high-performance hydrogel electrodes to enhance the ECS performance under a thermal gradient.The thermoelectric electrolyte is composed of polyacrylamide hydrogel and sodium carboxymethyl cellulose(PMSC),possessing cross-linked network with excellent cation selectivity,while the ionic thermoelectric properties are further improved in the presence of NaCl.The corresponding Seebeck coefficient and ionic conductivity of the NaCl–PMSC electrolyte reach 17.1 mV K^(-1)and 26.8 mS cm^(-1),respectively.Owing to good stretchability of both gel-based electrolyte and electrode,the fullstretchable integrated ECS device,termed ionic thermoelectric supercapacitor,presents promising thermal-charge storage capability(~1.3 mC,ΔT≈10 K),thus holds promise for wearable energy harvesting.展开更多
Carbon nanotubes(CNTs)have generated remarkable interests in a wide range of research fields due to their excellent electri-cal properties.However,achieving the CNTs arrangement with high quality in a short time remai...Carbon nanotubes(CNTs)have generated remarkable interests in a wide range of research fields due to their excellent electri-cal properties.However,achieving the CNTs arrangement with high quality in a short time remains a challenge.Herein we studied the in-situ assembly of CNTs based on macroscopic dielectrophoresis by using a centimeter scale electrode,which overcome the limitation of small size in traditional method for manipulating nanoparticles.Ordered CNTs chains could be obtained under the action of alternating current dielectrophoresis by optimizing the voltage and frequency.Besides,the ordered chains were able to restore immediately upon powering up after being damaged.Furthermore,a CNTs chain was prepared for conducting the wet circuit and powering a LED,and different conductive patterns on the non-woven fabric were achieved by controlling the position of the electrodes in wet environment.展开更多
基金financial support by the National Natural Science Foundation of China(No.51873033 and No.52073057)the Fundamental Research Funds for the Central Universities(2232020A-01 and 2232019A3-02)+3 种基金DHU Distinguished Young Professor Program(LZB2019002)Shanghai Rising-Star Program(20QA1400300)the Fundamental Research Funds for the Central University and Graduate Student Innovation Fund of Donghua University(CUSFDH-D-2020033)State Key Laboratory for Space Power Sources Technology(No.YF07050117F0768)。
文摘Converting low-grade waste heat into usable electricity and storing it simultaneously requires a new technology that realize the directional migration of electrons or ions under temperature difference and enrichment on the electrodes.Although the urgent demand of energy conversion-storage(ECS)has emerged in the field of wearable electronic,achieving the integrated bi-functional device remains challenge due to the different mechanisms of electrical transportation and storage.Here,we report an ionic thermoelectric supercapacitor that relies on the synergistic functions of thermoelectricity and supercapacitor in the thermoelectric ionogel electrolyte and high-performance hydrogel electrodes to enhance the ECS performance under a thermal gradient.The thermoelectric electrolyte is composed of polyacrylamide hydrogel and sodium carboxymethyl cellulose(PMSC),possessing cross-linked network with excellent cation selectivity,while the ionic thermoelectric properties are further improved in the presence of NaCl.The corresponding Seebeck coefficient and ionic conductivity of the NaCl–PMSC electrolyte reach 17.1 mV K^(-1)and 26.8 mS cm^(-1),respectively.Owing to good stretchability of both gel-based electrolyte and electrode,the fullstretchable integrated ECS device,termed ionic thermoelectric supercapacitor,presents promising thermal-charge storage capability(~1.3 mC,ΔT≈10 K),thus holds promise for wearable energy harvesting.
基金support by the Fundamental Research Funds for the Central Universities(2232019A3-02)DHU Distinguished Young Professor Program(LZB2019002)+3 种基金Innovation Program of Shanghai Municipal Education Commission(2017-01-07-00-03-E00055)China Postdoctoral Science Foundation Grant(2019M651324)State Key Laboratory for Space Power Sources Technology(No.YF07050117F0768)Shanghai Industrial Technology Center of Graphene.
文摘Carbon nanotubes(CNTs)have generated remarkable interests in a wide range of research fields due to their excellent electri-cal properties.However,achieving the CNTs arrangement with high quality in a short time remains a challenge.Herein we studied the in-situ assembly of CNTs based on macroscopic dielectrophoresis by using a centimeter scale electrode,which overcome the limitation of small size in traditional method for manipulating nanoparticles.Ordered CNTs chains could be obtained under the action of alternating current dielectrophoresis by optimizing the voltage and frequency.Besides,the ordered chains were able to restore immediately upon powering up after being damaged.Furthermore,a CNTs chain was prepared for conducting the wet circuit and powering a LED,and different conductive patterns on the non-woven fabric were achieved by controlling the position of the electrodes in wet environment.
