A two-dimensional(2 D)SnNb_(2)O_(6)/amino-functionalized graphene(En-RGO)nanocomposite with a representative 2 D-2 D architecture has been constructed by an easy self-assembly approach and firstly investigated as anod...A two-dimensional(2 D)SnNb_(2)O_(6)/amino-functionalized graphene(En-RGO)nanocomposite with a representative 2 D-2 D architecture has been constructed by an easy self-assembly approach and firstly investigated as anode materials for secondary sodium-ion batteries.The SnNb_(2)O_(6)nanosheets are evenly anchored with the aminofunctionalized graphene through electrostatic attractive interplay between the negatively charged SnNb_(2)O_(6)and positively charged En-RGO after modification.As a result,a remarkable reversible capacity of 300 mAh·g^(-1)was obtained at 50 mA·g^(-1),and significantly,the En-RGO electrode could also deliver ultra-long calendar life up to1900 cycles with a high reversible capacity of200 mAh·g^(-1)at current of 500 mA·g^(-1).Such excellent electrochemical characteristics can be mainly ascribed to its fast pseudo-capacitive energy storage mechanism,and the capacitive contribution can even reach up to 90%at1.2 mV·s^(-1).展开更多
Accelerating light-induced carrier transfer and improving charge utilization are essential for enhancing the efficiency of solar hydrogen production.In this work,for the first time,2D/2D covalent organicframework(COF)...Accelerating light-induced carrier transfer and improving charge utilization are essential for enhancing the efficiency of solar hydrogen production.In this work,for the first time,2D/2D covalent organicframework(COF)/SnNb_(2)O_(6)nanosheets were fabricated by a hydrothermal process.By adjusting the content of TpPa-2-COF,it was used to optimize the performance of solar hydrogen production.The optimal TpPa-2-COF/SnNb_(2)O_(6)nanosheets show a hydrogen production rate of 7.66μmol·h^(−1),which is 5.8-fold and 3.5-fold that of pristine SnNb_(2)O_(6)and TpPa-2-COF,respectively.The significant improvement in the photocatalytic performance can be attributed to the formation of a 2D/2D heterojunction nanosheet with a good energy band position between TpPa-2-COF and SnNb_(2)O_(6),which can efficaciously inhibit the restructuring of charge carriers.Through photoelectrochemical analysis,it is further proved that the interface interaction between TpPa-2-COF and SnNb_(2)O_(6)can lead to effective charge separation.Moreover,the cycling experiments reveal that the as-prepared photocatalyst has excellent stability and recycling performance.This study shows that the smart integration of organic(COF)and inorganic materials into a heterojunction with a 2D/2D structure is an available tactic for the fabrication of efficient photocatalysts.展开更多
基金the National Natural Science Foundation of China(Nos.51871113 and21601071)the Natural Science Foundation of Jiangsu Province(No.BK20160211)the Key Research and Development Program of Xuzhou(No.KC17004)。
文摘A two-dimensional(2 D)SnNb_(2)O_(6)/amino-functionalized graphene(En-RGO)nanocomposite with a representative 2 D-2 D architecture has been constructed by an easy self-assembly approach and firstly investigated as anode materials for secondary sodium-ion batteries.The SnNb_(2)O_(6)nanosheets are evenly anchored with the aminofunctionalized graphene through electrostatic attractive interplay between the negatively charged SnNb_(2)O_(6)and positively charged En-RGO after modification.As a result,a remarkable reversible capacity of 300 mAh·g^(-1)was obtained at 50 mA·g^(-1),and significantly,the En-RGO electrode could also deliver ultra-long calendar life up to1900 cycles with a high reversible capacity of200 mAh·g^(-1)at current of 500 mA·g^(-1).Such excellent electrochemical characteristics can be mainly ascribed to its fast pseudo-capacitive energy storage mechanism,and the capacitive contribution can even reach up to 90%at1.2 mV·s^(-1).
基金National Natural Science Foundation of China(21878129)the Industry Prospect and Key Core Technology(Competition Project)of Jiangsu Province(BE2019093)Sino-German Cooperation Group Project(GZ1579).
文摘Accelerating light-induced carrier transfer and improving charge utilization are essential for enhancing the efficiency of solar hydrogen production.In this work,for the first time,2D/2D covalent organicframework(COF)/SnNb_(2)O_(6)nanosheets were fabricated by a hydrothermal process.By adjusting the content of TpPa-2-COF,it was used to optimize the performance of solar hydrogen production.The optimal TpPa-2-COF/SnNb_(2)O_(6)nanosheets show a hydrogen production rate of 7.66μmol·h^(−1),which is 5.8-fold and 3.5-fold that of pristine SnNb_(2)O_(6)and TpPa-2-COF,respectively.The significant improvement in the photocatalytic performance can be attributed to the formation of a 2D/2D heterojunction nanosheet with a good energy band position between TpPa-2-COF and SnNb_(2)O_(6),which can efficaciously inhibit the restructuring of charge carriers.Through photoelectrochemical analysis,it is further proved that the interface interaction between TpPa-2-COF and SnNb_(2)O_(6)can lead to effective charge separation.Moreover,the cycling experiments reveal that the as-prepared photocatalyst has excellent stability and recycling performance.This study shows that the smart integration of organic(COF)and inorganic materials into a heterojunction with a 2D/2D structure is an available tactic for the fabrication of efficient photocatalysts.
