以咔唑为供体,设计并合成了具有D-A-π-A或D-π-A结构的有机敏化染料2-氰基-3-{5-[7-(9-己基咔唑-3-基)-苯并[1,2,5]噻二唑-4-基]-2-噻吩基}-丙烯酸(CVBTC)和2-氰基-3-{5-[7-(9-己基咔唑-3-基)]-2-噻吩基}-丙烯酸(CVHTC)。研究了结构变...以咔唑为供体,设计并合成了具有D-A-π-A或D-π-A结构的有机敏化染料2-氰基-3-{5-[7-(9-己基咔唑-3-基)-苯并[1,2,5]噻二唑-4-基]-2-噻吩基}-丙烯酸(CVBTC)和2-氰基-3-{5-[7-(9-己基咔唑-3-基)]-2-噻吩基}-丙烯酸(CVHTC)。研究了结构变化对敏化染料的光物理性质、电化学性质和光伏性能的影响。研究表明,在染料CVHTC的D-π-A结构链上插入受体苯并噻二唑单元,得到的具有D-A-π-A结构的染料CVBTC的共轭体系变大,带隙变小,光吸收性能得到明显提升。CVBTC和CVHTC的HOMO能级分别为-5.24和-5.52eV,LUMO能级分别为-3.20和-2.88eV,均能与常见电解质I-/I3-(-4.60eV vs vacuum)以及TiO2导带能级(-4.40eV vs vacuum)相匹配,都可用作DSSCs的敏化染料。并且与CVHTC相比,具有D-A-π-A结构CVBTC,因苯并噻二唑单元的引入,其光电池的短路电流和光电转换效率均得到明显提升。展开更多
近年来,钠离子电池电极材料引起了研究者们极大的兴趣.过渡金属硒化物具有高钠离子存储容量,是一种具有前景的钠离子电池负极材料.然而,该类材料较低的电导率以及钠离子脱嵌过程中巨大的体积膨胀,导致了其较差的钠离子电池倍率性能和循...近年来,钠离子电池电极材料引起了研究者们极大的兴趣.过渡金属硒化物具有高钠离子存储容量,是一种具有前景的钠离子电池负极材料.然而,该类材料较低的电导率以及钠离子脱嵌过程中巨大的体积膨胀,导致了其较差的钠离子电池倍率性能和循环寿命.本工作采用二维的双金属有机框架材料为模板,设计制造了多孔铁掺杂NiSe_(2)纳米片材料(Fe-NiSe_(2)@C NSs),该结构具有充分暴露的活性位点,增强的电导率,丰富的空隙和短电子传输路径,易于适应钠离子脱嵌带来的体积膨胀应力,并具有快速的电荷转移动力学.作为钠离子电池负极材料时,Fe-NiSe_(2)@C NSs表现出高比容量(5 A g^(-1)电流密度下为302 mA h g^(-1))和优异的循环稳定性(5 A g^(-1)的电流密度下循环1000圈容量保持率为99%).此外,该材料在与Na3V2(PO4)2O2F正极材料组成的钠离子全电池中也表现出了高能量密度(107 W h kg^(-1)).大量非原位表征和理论计算进一步验证了Fe掺杂使电子密度增大,对于提升Fe-NiSe_(2)@C NSs的钠离子电池综合性能具有重要意义.本研究为制备高性能钠离子电池电极材料提供了新思路.展开更多
Owing to the abundance and low price of sodium,researches on sodium-ion batteries(SIBs)as a lithiumion battery(LIB)alternative are emerging as a consensus.It is crucial to develop electrode materials suitable for sodi...Owing to the abundance and low price of sodium,researches on sodium-ion batteries(SIBs)as a lithiumion battery(LIB)alternative are emerging as a consensus.It is crucial to develop electrode materials suitable for sodium storage.In recent years,two-dimensional(2 D)layered transition metal disulfide compounds(TMDs)have trigered interest in the realm of energy and environmental fields.In particular,MoSeis thought to be a suitable material for SIBs due to its wide original layer spacing and high conductivity.Herein,N-doped dual carbon-coated MoSewith multichannel paths(MoSe/multichannel carbon nanofibers(MCFs)@NC)is fabricated via electrospinning,followed by a selenation and carbonization process.The existence of a 3 D conductive network,abundant void spaces,and sufficient electron transportation pathways are conducive to rapid and fast charge transfer kinetics under volume expansion stress.When applied in SIBs,the MoSe/MCFs@NC shows a high capability(319 mA hg^(-1)at 10 A g^(-1)),as well as good cycling stability(303 mA h g^(-1)after 1100 cycles at 10 A g^(-1)).Furthermore,coupled with the Na_(3)V_(2)(PO_(4))_(2)O_(2)F cathode,the full cell also exhibits excellent performance.The theoretical calculation of the MoSe_(2)/MCFs@NC confirms that the superiority of its SIB performance is owing to the strong interaction between the double-doped carbon and MoSe.This scheme provides a wide space for preparing high-performance electrode materials for SIBs.展开更多
文摘以咔唑为供体,设计并合成了具有D-A-π-A或D-π-A结构的有机敏化染料2-氰基-3-{5-[7-(9-己基咔唑-3-基)-苯并[1,2,5]噻二唑-4-基]-2-噻吩基}-丙烯酸(CVBTC)和2-氰基-3-{5-[7-(9-己基咔唑-3-基)]-2-噻吩基}-丙烯酸(CVHTC)。研究了结构变化对敏化染料的光物理性质、电化学性质和光伏性能的影响。研究表明,在染料CVHTC的D-π-A结构链上插入受体苯并噻二唑单元,得到的具有D-A-π-A结构的染料CVBTC的共轭体系变大,带隙变小,光吸收性能得到明显提升。CVBTC和CVHTC的HOMO能级分别为-5.24和-5.52eV,LUMO能级分别为-3.20和-2.88eV,均能与常见电解质I-/I3-(-4.60eV vs vacuum)以及TiO2导带能级(-4.40eV vs vacuum)相匹配,都可用作DSSCs的敏化染料。并且与CVHTC相比,具有D-A-π-A结构CVBTC,因苯并噻二唑单元的引入,其光电池的短路电流和光电转换效率均得到明显提升。
基金financially supported by the National Natural Science Foundation of China(51801030)the Science and Technology Development Plan of Suzhou(ZXL2021176)+1 种基金China Postdoctoral Science Foundation(2022M711686)Jiangsu Provincial Funds for the Young Scholars(BK20190978)。
文摘近年来,钠离子电池电极材料引起了研究者们极大的兴趣.过渡金属硒化物具有高钠离子存储容量,是一种具有前景的钠离子电池负极材料.然而,该类材料较低的电导率以及钠离子脱嵌过程中巨大的体积膨胀,导致了其较差的钠离子电池倍率性能和循环寿命.本工作采用二维的双金属有机框架材料为模板,设计制造了多孔铁掺杂NiSe_(2)纳米片材料(Fe-NiSe_(2)@C NSs),该结构具有充分暴露的活性位点,增强的电导率,丰富的空隙和短电子传输路径,易于适应钠离子脱嵌带来的体积膨胀应力,并具有快速的电荷转移动力学.作为钠离子电池负极材料时,Fe-NiSe_(2)@C NSs表现出高比容量(5 A g^(-1)电流密度下为302 mA h g^(-1))和优异的循环稳定性(5 A g^(-1)的电流密度下循环1000圈容量保持率为99%).此外,该材料在与Na3V2(PO4)2O2F正极材料组成的钠离子全电池中也表现出了高能量密度(107 W h kg^(-1)).大量非原位表征和理论计算进一步验证了Fe掺杂使电子密度增大,对于提升Fe-NiSe_(2)@C NSs的钠离子电池综合性能具有重要意义.本研究为制备高性能钠离子电池电极材料提供了新思路.
基金financially supported by the National Natural Science Foundation of China(51801030)the Natural Science Foundation of Guangdong Providence(2018A030310571)+2 种基金the Science and Technology Development Plan of Suzhou(ZXL2021176)China Postdoctoral Science Foundation(2022M711686)Jiangsu Provincial Funds for the Young Scholars(BK20190978)。
文摘Owing to the abundance and low price of sodium,researches on sodium-ion batteries(SIBs)as a lithiumion battery(LIB)alternative are emerging as a consensus.It is crucial to develop electrode materials suitable for sodium storage.In recent years,two-dimensional(2 D)layered transition metal disulfide compounds(TMDs)have trigered interest in the realm of energy and environmental fields.In particular,MoSeis thought to be a suitable material for SIBs due to its wide original layer spacing and high conductivity.Herein,N-doped dual carbon-coated MoSewith multichannel paths(MoSe/multichannel carbon nanofibers(MCFs)@NC)is fabricated via electrospinning,followed by a selenation and carbonization process.The existence of a 3 D conductive network,abundant void spaces,and sufficient electron transportation pathways are conducive to rapid and fast charge transfer kinetics under volume expansion stress.When applied in SIBs,the MoSe/MCFs@NC shows a high capability(319 mA hg^(-1)at 10 A g^(-1)),as well as good cycling stability(303 mA h g^(-1)after 1100 cycles at 10 A g^(-1)).Furthermore,coupled with the Na_(3)V_(2)(PO_(4))_(2)O_(2)F cathode,the full cell also exhibits excellent performance.The theoretical calculation of the MoSe_(2)/MCFs@NC confirms that the superiority of its SIB performance is owing to the strong interaction between the double-doped carbon and MoSe.This scheme provides a wide space for preparing high-performance electrode materials for SIBs.
