Dual-ion batteries(DIBs) have attracted immense interest as a new generation of energy storage device due to their low cost,environmental friendliness and high working voltage.However,developing DIBs using organic com...Dual-ion batteries(DIBs) have attracted immense interest as a new generation of energy storage device due to their low cost,environmental friendliness and high working voltage.However,developing DIBs using organic compounds as active electrode materials is in its infancy.Herein,we first report a bipolar and self-polymerized Cu phthalocyanine(CuTAPc) as an electrode material for sodium-based DIBs(SDIBs).Benefitting from the bipolar property,CuTAPc could serve as the cathode or anode material to construct metal sodium-based or metal sodium-free SDIB(cell 1 or 2) by coupling with sodium anode or graphite cathode,respectively.As a result,cell 1 displays a high discharge capacity of 195.7 mAh g^(-1) at 50 mA g^(-1) and a high reversible capacity of 57 mAh g^(-1) over 2500 cycles at 1 A g^(-1),and cell 2 shows a high energy density of 324 Wh kg^(-1) and a high power density of 7481 W kg^(-1).Subsequently,the proposed binding mechanism and the bipolar reactivity of CuTAPc have been revealed by the detailed reaction kinetic analysis and ex-situ techniques as well as the density functional theory(DFT) calculations.This work could open a pathway to develop the advanced SDIBs constructed by elemental abundant and environmentally friendly organic materials.展开更多
Two n-butoxy-encapsulated dendritic thermally activated delayed fluorescent(TADF) emitters(namely O-D1 and O-D2) with the first-/second-generation carbazoledendrons are designed and synthesized via C—N coupling betwe...Two n-butoxy-encapsulated dendritic thermally activated delayed fluorescent(TADF) emitters(namely O-D1 and O-D2) with the first-/second-generation carbazoledendrons are designed and synthesized via C—N coupling between carbazoledendrons and 2,4,6-tris(4-bromophenyl)-1,3,5-triazine core.It is found that,compa red with the commo nly-used tert-butyl groups,the use of n-butoxy encapsulation groups can lead to smallersinglet-triplet energy gap for the dendrimers,producing stronger TADF effect together with faster reverse intersystem crossing process.Solution-processed TADF organic light-emitting diodes(OLEDs) utilizingalkoxy-encapsulated dendrimers O-D1 and O-D2 as emitters exhibitstate-of-the-art device efficiency withthe maximum external quantum efficiency up to 16.8% and 20.6%,respectively,which are ~1.6 and~2.0 times that of the tert-butyl-encapsulated counterparts.These results suggest that alkoxy encapsulation of the carbazole-based TADF dendrimers can be a promising approach for developing highly efficient emitters for solution-processed OLEDs.展开更多
基金financially supported by the National Natural Science Foundation of China(Grant No.21965025)the Education Department of Jilin Province(JJKH20190584KJ)。
文摘Dual-ion batteries(DIBs) have attracted immense interest as a new generation of energy storage device due to their low cost,environmental friendliness and high working voltage.However,developing DIBs using organic compounds as active electrode materials is in its infancy.Herein,we first report a bipolar and self-polymerized Cu phthalocyanine(CuTAPc) as an electrode material for sodium-based DIBs(SDIBs).Benefitting from the bipolar property,CuTAPc could serve as the cathode or anode material to construct metal sodium-based or metal sodium-free SDIB(cell 1 or 2) by coupling with sodium anode or graphite cathode,respectively.As a result,cell 1 displays a high discharge capacity of 195.7 mAh g^(-1) at 50 mA g^(-1) and a high reversible capacity of 57 mAh g^(-1) over 2500 cycles at 1 A g^(-1),and cell 2 shows a high energy density of 324 Wh kg^(-1) and a high power density of 7481 W kg^(-1).Subsequently,the proposed binding mechanism and the bipolar reactivity of CuTAPc have been revealed by the detailed reaction kinetic analysis and ex-situ techniques as well as the density functional theory(DFT) calculations.This work could open a pathway to develop the advanced SDIBs constructed by elemental abundant and environmentally friendly organic materials.
基金the financial support from the Science and Technology Development Plan Project of Jilin Province (No.20180520003JH)the Natural Science Fund Project of Changchun University of Science and Technology (No.XQNJJ2017-14)the Youth Innovation Promotion Association of Chinese Academy of Sciences (No.2015180)。
文摘Two n-butoxy-encapsulated dendritic thermally activated delayed fluorescent(TADF) emitters(namely O-D1 and O-D2) with the first-/second-generation carbazoledendrons are designed and synthesized via C—N coupling between carbazoledendrons and 2,4,6-tris(4-bromophenyl)-1,3,5-triazine core.It is found that,compa red with the commo nly-used tert-butyl groups,the use of n-butoxy encapsulation groups can lead to smallersinglet-triplet energy gap for the dendrimers,producing stronger TADF effect together with faster reverse intersystem crossing process.Solution-processed TADF organic light-emitting diodes(OLEDs) utilizingalkoxy-encapsulated dendrimers O-D1 and O-D2 as emitters exhibitstate-of-the-art device efficiency withthe maximum external quantum efficiency up to 16.8% and 20.6%,respectively,which are ~1.6 and~2.0 times that of the tert-butyl-encapsulated counterparts.These results suggest that alkoxy encapsulation of the carbazole-based TADF dendrimers can be a promising approach for developing highly efficient emitters for solution-processed OLEDs.
