A binder-free Ni3S2 electrode was prepared directly on a graphene-coated Ni foam （G/Ni） substrate through surface sulfiding of substrate using thiourea as the sulfur source in this work. The Ni3S2 showed a flower-li...A binder-free Ni3S2 electrode was prepared directly on a graphene-coated Ni foam （G/Ni） substrate through surface sulfiding of substrate using thiourea as the sulfur source in this work. The Ni3S2 showed a flower-like morphology and was uniformly distributed on the G/Ni surface. The flower-like Ni3S2 was composed of cross-arrayed nanoflakes with a diameter and a thickness of 1-2 μm and -50 nm, re- spectively. The free space in the flowers and the thin feature of Ni3S2 buffered the volume changes and relieved mechanical strain during re- peated cycling. The intimate contact with the Ni substrate and the fixing effect of graphene maintained the structural stability of the Ni3S2 electrode during cycling. The G/Ni-supported Ni3S2 maintained a reversible capacity of 250 mAh·g^-1 after 100 cycles at 50 mA·g^-1, demon- strating the good cycling stability as a result of the unique microstructure of this electrode material.展开更多
TiO2/Bi4 Ti3 O12 hybrids have been widely prepared as promising photocatalysts for decomposing organic contaminations.However,the insufficient visible light absorption and low charge separation efficiency lead to thei...TiO2/Bi4 Ti3 O12 hybrids have been widely prepared as promising photocatalysts for decomposing organic contaminations.However,the insufficient visible light absorption and low charge separation efficiency lead to their poor photocatalytic activity.Herein,a robust methodology to construct novel TiO2/Bi4 Ti3 O12/MoS2 core/shell structures as visible light photocatalysts is presented.Homogeneous bismuth oxyiodide(BiOI) nanoplates were immobilized on electrospun TiO2 nanofiber surface by successive ionic layer adsorption and reaction(SILAR) method.TiO2/Bi4 Ti3 O12 core/shell nanofibers were conveniently prepared by partial conversion of TiO2 to high crystallized Bi4 Ti3 O12 shells through a solid-state reaction with BiOI nanoplates,which is accompanied with certain transition of TiO2 from anatase to rutile phase.Afterwards,MoS2 nanosheets with several layers thick were uniform decorated on the TiO2/Bi4 TiO3 O12 fiber surface resulting in TiO2/Bi4 Ti3 O12/MoS2 structures.Significant enhancement of visible light absorption and photo-generated charge separation of TiO2/Bi4 Ti3 O12 were achieved by introduction of MoS2.As a result,the optimized TiO2/Bi4 Ti3 O12/MoS2-2 presents 60% improvement for photodegrading RhB after 120 min irradiation under visible light and 3 times higher of apparent reaction rate constant in compared with the TiO2/Bi4 Ti3 O12.This synthetic method can also be used to establish other photocatalysts simply at low cost,therefore,is suitable for practical applications.展开更多
By using Bi(S2CNEt2)3 as single-source precursor, Bi2S3 nanoflowers and nanorods have been obtained via a solvothermal treatment. The effect of water, ethylene glycol and polyethylene glycol as reaction medium on the ...By using Bi(S2CNEt2)3 as single-source precursor, Bi2S3 nanoflowers and nanorods have been obtained via a solvothermal treatment. The effect of water, ethylene glycol and polyethylene glycol as reaction medium on the structure and shape of Bi2S3 nanosized materials was investigated, and Bi2S3 nanoflowers and nanorods were characterized by SEM, TEM and XRD.展开更多
Recently,because of excellent electrical conductivities and many active sites,transition metal sulfides have been utilized as efficient electrodes for supercapacitors.Herein,we synthesize hierarchical MoS2/Ni3S2 struc...Recently,because of excellent electrical conductivities and many active sites,transition metal sulfides have been utilized as efficient electrodes for supercapacitors.Herein,we synthesize hierarchical MoS2/Ni3S2 structures grown on nickel foam by a facile one-pot hydrothermal process.The as-fabricated asymmetric hybrid capacitor based on hierarchical MoS2/Ni3S2 electrode exhibit a specific capacitance of^1.033 C/cm2 at1 mA/cm2.Furthermore,the hybrid capacitor unveils an energy density of 35.93 m W h/cm3 at a power density of 1064.76 mW/cm3.The observed results clearly revealed that the synthesized MoS2/Ni3S2 structure might be used as potential electrode material for future energy storage devices.展开更多
Silica glasses doped with Bi2S3 microcystallite was prepared by the sol-gel process. Photoinduced second harmonic generation (SHG) was observed in the glass when it was irradiated with intense 1.06 mum and frequency d...Silica glasses doped with Bi2S3 microcystallite was prepared by the sol-gel process. Photoinduced second harmonic generation (SHG) was observed in the glass when it was irradiated with intense 1.06 mum and frequency doubled laser beams from a mode-locked Nd: YAG laser. It was found that the signal intensity increased with the irradiating time and approached a saturation gradually. The effect may be explained reasonably by the DC field model.展开更多
The nickel‐based complex Ni‐CH3CH2NH2‐intercalated niobate layered perovskite Ni‐CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7was synthesized via a facile in situ chemical reaction method.Using ultrathin H1.78Sr0.78Bi0.22Nb2O7...The nickel‐based complex Ni‐CH3CH2NH2‐intercalated niobate layered perovskite Ni‐CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7was synthesized via a facile in situ chemical reaction method.Using ultrathin H1.78Sr0.78Bi0.22Nb2O7nanosheets and nickel acetate as precursors.The composition,structure,photophysical properties,and photocatalytic activity for H2production of Ni‐CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7were studied systematically.The photocatalyst loaded with0.5wt%Ni exhibited the highest H2evolution rate of372.67μmo/h.This was0.54times higher than the activity of the H1.78Sr0.78Bi0.22Nb2O7nanosheets.The activity of the optimized Ni‐CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7was comparable to that of the Pt‐loaded sample under the same reaction conditions.The photocatalytic activity of the Ni‐CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7was mainly attributed to the excellent separation of photogenerated carriers,after formation of the intercalated complex Ni‐CH3CH2NH2.This study provides a facile strategy to synthesize a non‐precious metal‐loaded photocatalyst for H2production.展开更多
In the original publication,Figure S4 is an ancillary image to compare the specific surface areas of TiO2/Ni3S2 and Ni3S2 samples and it was incorrectly published.To better serve our readers,the correct figure is prov...In the original publication,Figure S4 is an ancillary image to compare the specific surface areas of TiO2/Ni3S2 and Ni3S2 samples and it was incorrectly published.To better serve our readers,the correct figure is provided in this correction.The BET values are correct and unaffected.The corresponding figure caption,data analysis and conclusions are not affected and thus not to be changed.The authors would like to apologize for any inconvenience caused.展开更多
基金financially supported by the Scientific and Technological Project of State Grid Corporation of China
文摘A binder-free Ni3S2 electrode was prepared directly on a graphene-coated Ni foam （G/Ni） substrate through surface sulfiding of substrate using thiourea as the sulfur source in this work. The Ni3S2 showed a flower-like morphology and was uniformly distributed on the G/Ni surface. The flower-like Ni3S2 was composed of cross-arrayed nanoflakes with a diameter and a thickness of 1-2 μm and -50 nm, re- spectively. The free space in the flowers and the thin feature of Ni3S2 buffered the volume changes and relieved mechanical strain during re- peated cycling. The intimate contact with the Ni substrate and the fixing effect of graphene maintained the structural stability of the Ni3S2 electrode during cycling. The G/Ni-supported Ni3S2 maintained a reversible capacity of 250 mAh·g^-1 after 100 cycles at 50 mA·g^-1, demon- strating the good cycling stability as a result of the unique microstructure of this electrode material.
基金supported financially by the National Natural Science Foundation of China(Nos.21501140,21403165,51372197)the Outstanding Youth Science Fund of Xi’an University of Science and Technology(No.2019YQ2-06)the Key Innovation Team of Shaanxi Province(No.2014KCT-04)。
文摘TiO2/Bi4 Ti3 O12 hybrids have been widely prepared as promising photocatalysts for decomposing organic contaminations.However,the insufficient visible light absorption and low charge separation efficiency lead to their poor photocatalytic activity.Herein,a robust methodology to construct novel TiO2/Bi4 Ti3 O12/MoS2 core/shell structures as visible light photocatalysts is presented.Homogeneous bismuth oxyiodide(BiOI) nanoplates were immobilized on electrospun TiO2 nanofiber surface by successive ionic layer adsorption and reaction(SILAR) method.TiO2/Bi4 Ti3 O12 core/shell nanofibers were conveniently prepared by partial conversion of TiO2 to high crystallized Bi4 Ti3 O12 shells through a solid-state reaction with BiOI nanoplates,which is accompanied with certain transition of TiO2 from anatase to rutile phase.Afterwards,MoS2 nanosheets with several layers thick were uniform decorated on the TiO2/Bi4 TiO3 O12 fiber surface resulting in TiO2/Bi4 Ti3 O12/MoS2 structures.Significant enhancement of visible light absorption and photo-generated charge separation of TiO2/Bi4 Ti3 O12 were achieved by introduction of MoS2.As a result,the optimized TiO2/Bi4 Ti3 O12/MoS2-2 presents 60% improvement for photodegrading RhB after 120 min irradiation under visible light and 3 times higher of apparent reaction rate constant in compared with the TiO2/Bi4 Ti3 O12.This synthetic method can also be used to establish other photocatalysts simply at low cost,therefore,is suitable for practical applications.
文摘By using Bi(S2CNEt2)3 as single-source precursor, Bi2S3 nanoflowers and nanorods have been obtained via a solvothermal treatment. The effect of water, ethylene glycol and polyethylene glycol as reaction medium on the structure and shape of Bi2S3 nanosized materials was investigated, and Bi2S3 nanoflowers and nanorods were characterized by SEM, TEM and XRD.
基金supported by State Key Laboratory of New Ceramic and Fine Processing Tsinghua University(No.KF201807)
文摘Recently,because of excellent electrical conductivities and many active sites,transition metal sulfides have been utilized as efficient electrodes for supercapacitors.Herein,we synthesize hierarchical MoS2/Ni3S2 structures grown on nickel foam by a facile one-pot hydrothermal process.The as-fabricated asymmetric hybrid capacitor based on hierarchical MoS2/Ni3S2 electrode exhibit a specific capacitance of^1.033 C/cm2 at1 mA/cm2.Furthermore,the hybrid capacitor unveils an energy density of 35.93 m W h/cm3 at a power density of 1064.76 mW/cm3.The observed results clearly revealed that the synthesized MoS2/Ni3S2 structure might be used as potential electrode material for future energy storage devices.
文摘Silica glasses doped with Bi2S3 microcystallite was prepared by the sol-gel process. Photoinduced second harmonic generation (SHG) was observed in the glass when it was irradiated with intense 1.06 mum and frequency doubled laser beams from a mode-locked Nd: YAG laser. It was found that the signal intensity increased with the irradiating time and approached a saturation gradually. The effect may be explained reasonably by the DC field model.
基金supported by the National Natural Science Foundation of China(U1403193,21643012)~~
文摘The nickel‐based complex Ni‐CH3CH2NH2‐intercalated niobate layered perovskite Ni‐CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7was synthesized via a facile in situ chemical reaction method.Using ultrathin H1.78Sr0.78Bi0.22Nb2O7nanosheets and nickel acetate as precursors.The composition,structure,photophysical properties,and photocatalytic activity for H2production of Ni‐CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7were studied systematically.The photocatalyst loaded with0.5wt%Ni exhibited the highest H2evolution rate of372.67μmo/h.This was0.54times higher than the activity of the H1.78Sr0.78Bi0.22Nb2O7nanosheets.The activity of the optimized Ni‐CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7was comparable to that of the Pt‐loaded sample under the same reaction conditions.The photocatalytic activity of the Ni‐CH3CH2NH2/H1.78Sr0.78Bi0.22Nb2O7was mainly attributed to the excellent separation of photogenerated carriers,after formation of the intercalated complex Ni‐CH3CH2NH2.This study provides a facile strategy to synthesize a non‐precious metal‐loaded photocatalyst for H2production.
文摘In the original publication,Figure S4 is an ancillary image to compare the specific surface areas of TiO2/Ni3S2 and Ni3S2 samples and it was incorrectly published.To better serve our readers,the correct figure is provided in this correction.The BET values are correct and unaffected.The corresponding figure caption,data analysis and conclusions are not affected and thus not to be changed.The authors would like to apologize for any inconvenience caused.
