Sodium-ion batteries(SIBs)show promising potential in the field of electrochemical energy storage due to their cost-effectiveness and similar operational mechanisms to lithium-ion batteries(LIBs).However,the dramatic ...Sodium-ion batteries(SIBs)show promising potential in the field of electrochemical energy storage due to their cost-effectiveness and similar operational mechanisms to lithium-ion batteries(LIBs).However,the dramatic volume expansion of electrode materials and the slow reaction kinetics caused by the large sodium ion(Na^(+))radius hinder the practical application of SIBs,Here,we successfully prepared SnS_(2-x)Se_(x)nanodots embedded within N-doped carbon nanofibers(CNF)for use as electrode materials of SIBs,The introduction Se provided abundant anionic defect sites for Na+storage and enlarged the interlayer spacing of SnS_(2).In addition,the ultraifne nanodot structure reduces the volume expansion of SnS_(2-x)Se_(x)and shortens the ion transport path.As an anode of SIBs,SnS_(2-x)Se_(x)/CNF demonstrates remarkable reversible capacity(719 mAh g^(-1)at 0.5 A g^(-1)),along with rapid charging ability(completing a charge in just 127 s).Meanwhile,the assembled full-cell battery manifested exceptional energy density of 165.8 Wh kg^(-1)at a high-power output of 5526 W kg^(-1).This study presents an effective strategy for fabricating highperformance sulphide-based anode materials for SIBs,offering broad prospects for application.展开更多
Effective separation of bulk phase and surface charges is crucial for maximizing charge utilization in the process of photocatalytic energy conversion.In this study,SnS_(2) nanoflowers and twinned Mn_(0.5) Cd_(0.5) S ...Effective separation of bulk phase and surface charges is crucial for maximizing charge utilization in the process of photocatalytic energy conversion.In this study,SnS_(2) nanoflowers and twinned Mn_(0.5) Cd_(0.5) S solid solution(T-MCS)nanoparticles were fabricated by a one-step solvothermal method respectively,fol-lowed by the formation of SnS_(2)/T-MCS nanohybrids through a facile physical solvent evaporation process for high-efficiency photocatalytic hydrogen(H_(2))production.The T-MCS crystal structure consists of alter-nating wurtzite Mn_(0.5) Cd_(0.5) S(WZ-MCS)and zinc blende Mn_(0.5) Cd_(0.5) S(ZB-MCS),forming a twin structure within the semiconductor.The charge migration mechanism between WZ-MCS and ZB-MCS follows the S-scheme pathway owing to slight differences in energy levels within their respective crystal structures,resulting in exceptional bulk phase charge separation capacity of T-MCS.Additionally,SnS_(2) enhances the electrochemical performance of the catalysts by providing more active sites,reducing charge transfer re-sistance and H_(2) production overpotential,thereby facilitating faster reaction kinetics.The photoelectro-chemical tests,radical trapping experiments,density functional theory(DFT),and electron paramagnetic resonance spectroscopy(EPR)confirm that the charge transfer path between SnS_(2) and T-MCS follows an S-type route that accelerates interfacial photo-induced electrons and holes separation while preserving useful charges.The synergistic impact of twinned homojunction and S-type heterojunction in 10 wt.%SnS_(2)/T-MCS composite contributes to a remarkable H_(2) production rate of 182.82 mmol h^(-1) g^(-1),which is 761.8 times higher than that achieved with SnS_(2) alone(0.24 mmol h^(-1) g^(-1)),as well as 5.8 times higher than that achieved with T-MCS alone(31.54 mmol h^(-1) g^(-1)).This study offers novel insights into design-ing highly efficient sulfide photocatalysts specifically targeting solar-driven H_(2) evolution through a dual S-scheme transfer pathway.展开更多
通过水热法制备了SnS_(2)/还原氧化石墨烯(SnS_(2)/RGO)复合材料,采用X射线衍射谱(XRD)、拉曼光谱(Raman)、X射线光电子能谱(XPS)和N2吸附-脱附表征SnS_(2)/RGO复合材料的物相晶型、化学基团、元素组成和比表面积与孔隙孔径。SnS_(2)/RG...通过水热法制备了SnS_(2)/还原氧化石墨烯(SnS_(2)/RGO)复合材料,采用X射线衍射谱(XRD)、拉曼光谱(Raman)、X射线光电子能谱(XPS)和N2吸附-脱附表征SnS_(2)/RGO复合材料的物相晶型、化学基团、元素组成和比表面积与孔隙孔径。SnS_(2)/RGO复合材料作为锂离子电池负极材料组装纽扣电池。结果表明:电流密度100 m A/g条件下,SnS_(2)/RGO复合材料的充放电比容量明显高于纯SnS_(2),SnS_(2)/RGO复合材料第一次放电比容量高达2803 m Ah/g,表现出优异的电化学性能。循环100次后放电比容量仍然可以达到941 mAh/g,而循环100次后纯SnS_(2)的放电比容量远低于SnS_(2)/RGO复合材料,仅为198 m Ah/g,表现出良好的循环稳定性。1 000 m A/g的高电流密度下,SnS_(2)/RGO复合材料放电比容量依然可以达到696 mAh/g,表现出良好的倍率性能。展开更多
基金financially supported by the National Natural Science Foundation of China(22278348)Natural Science Foundation of Xinjiang Autonomous Region(2022D01D05)+1 种基金National guidance for local projects of Xinjiang Autonomous Region(ZYYD2025JD09)Tianshan Leading technology talents Program of Xinjiang Autonomous Region。
文摘Sodium-ion batteries(SIBs)show promising potential in the field of electrochemical energy storage due to their cost-effectiveness and similar operational mechanisms to lithium-ion batteries(LIBs).However,the dramatic volume expansion of electrode materials and the slow reaction kinetics caused by the large sodium ion(Na^(+))radius hinder the practical application of SIBs,Here,we successfully prepared SnS_(2-x)Se_(x)nanodots embedded within N-doped carbon nanofibers(CNF)for use as electrode materials of SIBs,The introduction Se provided abundant anionic defect sites for Na+storage and enlarged the interlayer spacing of SnS_(2).In addition,the ultraifne nanodot structure reduces the volume expansion of SnS_(2-x)Se_(x)and shortens the ion transport path.As an anode of SIBs,SnS_(2-x)Se_(x)/CNF demonstrates remarkable reversible capacity(719 mAh g^(-1)at 0.5 A g^(-1)),along with rapid charging ability(completing a charge in just 127 s).Meanwhile,the assembled full-cell battery manifested exceptional energy density of 165.8 Wh kg^(-1)at a high-power output of 5526 W kg^(-1).This study presents an effective strategy for fabricating highperformance sulphide-based anode materials for SIBs,offering broad prospects for application.
基金supported by the National Natural Science Foundation of China(Nos.22378326,11974276,and 22078261)the Northwest University Graduate Student Innovation Project(No.CX2023155)+3 种基金the Natural Science Basic Research Program of Shaanxi Province(No.2023-JC-YB-115)the Shaanxi Key Science and Technology Innovation Team Project(No.2022TD-33)Qin Chuangyuan project of Shaanxi Province(No.QCYRCXM-2022-213)The Key Research and Development Program of Shaanxi Province(No.2024GX-YBXM-449).
文摘Effective separation of bulk phase and surface charges is crucial for maximizing charge utilization in the process of photocatalytic energy conversion.In this study,SnS_(2) nanoflowers and twinned Mn_(0.5) Cd_(0.5) S solid solution(T-MCS)nanoparticles were fabricated by a one-step solvothermal method respectively,fol-lowed by the formation of SnS_(2)/T-MCS nanohybrids through a facile physical solvent evaporation process for high-efficiency photocatalytic hydrogen(H_(2))production.The T-MCS crystal structure consists of alter-nating wurtzite Mn_(0.5) Cd_(0.5) S(WZ-MCS)and zinc blende Mn_(0.5) Cd_(0.5) S(ZB-MCS),forming a twin structure within the semiconductor.The charge migration mechanism between WZ-MCS and ZB-MCS follows the S-scheme pathway owing to slight differences in energy levels within their respective crystal structures,resulting in exceptional bulk phase charge separation capacity of T-MCS.Additionally,SnS_(2) enhances the electrochemical performance of the catalysts by providing more active sites,reducing charge transfer re-sistance and H_(2) production overpotential,thereby facilitating faster reaction kinetics.The photoelectro-chemical tests,radical trapping experiments,density functional theory(DFT),and electron paramagnetic resonance spectroscopy(EPR)confirm that the charge transfer path between SnS_(2) and T-MCS follows an S-type route that accelerates interfacial photo-induced electrons and holes separation while preserving useful charges.The synergistic impact of twinned homojunction and S-type heterojunction in 10 wt.%SnS_(2)/T-MCS composite contributes to a remarkable H_(2) production rate of 182.82 mmol h^(-1) g^(-1),which is 761.8 times higher than that achieved with SnS_(2) alone(0.24 mmol h^(-1) g^(-1)),as well as 5.8 times higher than that achieved with T-MCS alone(31.54 mmol h^(-1) g^(-1)).This study offers novel insights into design-ing highly efficient sulfide photocatalysts specifically targeting solar-driven H_(2) evolution through a dual S-scheme transfer pathway.
文摘通过水热法制备了SnS_(2)/还原氧化石墨烯(SnS_(2)/RGO)复合材料,采用X射线衍射谱(XRD)、拉曼光谱(Raman)、X射线光电子能谱(XPS)和N2吸附-脱附表征SnS_(2)/RGO复合材料的物相晶型、化学基团、元素组成和比表面积与孔隙孔径。SnS_(2)/RGO复合材料作为锂离子电池负极材料组装纽扣电池。结果表明:电流密度100 m A/g条件下,SnS_(2)/RGO复合材料的充放电比容量明显高于纯SnS_(2),SnS_(2)/RGO复合材料第一次放电比容量高达2803 m Ah/g,表现出优异的电化学性能。循环100次后放电比容量仍然可以达到941 mAh/g,而循环100次后纯SnS_(2)的放电比容量远低于SnS_(2)/RGO复合材料,仅为198 m Ah/g,表现出良好的循环稳定性。1 000 m A/g的高电流密度下,SnS_(2)/RGO复合材料放电比容量依然可以达到696 mAh/g,表现出良好的倍率性能。
