In this paper,we have reported the synthesis of FeS2 of higher band gap energy（2.75 eV） by using capping reagent and its successive application in organic-inorganic based hybrid solar cells.Hydrothermal route was ad...In this paper,we have reported the synthesis of FeS2 of higher band gap energy（2.75 eV） by using capping reagent and its successive application in organic-inorganic based hybrid solar cells.Hydrothermal route was adopted for preparing iron pyrite（FeS2） nanoparticles with capping reagent PEG-400.The quality of synthesized FeS2 material was confirmed by X-ray diffraction,field emission scanning electron microscopy,transmission electron microscopy,Fourier transform infrared,thermogravimetric analyzer,and Raman study.The optical band gap energy and electro-chemical band gap energy of the synthesized FeS2 were investigated by UV-vis spectrophotometry and cyclic voltammetry.Finally band gap engineered FeS2 has been successfully used in conjunction with conjugated polymer MEHPPV for harvesting solar energy.The energy conversion efficiency was obtained as 0.064%with a fill-factor of 0.52.展开更多
FeS2 has drawn tremendous attention as electrode material for sodium-ion batteries(SIBs)due to its high theoretical capacity and abundant resources.However,it suffers from severe volume expansion and dull reaction kin...FeS2 has drawn tremendous attention as electrode material for sodium-ion batteries(SIBs)due to its high theoretical capacity and abundant resources.However,it suffers from severe volume expansion and dull reaction kinetics during the cycling process,leading to poor rate capacity and short cyclability.Herein,a well-designed FeS2@C/G composite constructed by FeS2 nanoparticles embedded in porous carbon nanorods(FeS2@C)and covered by three-dimensional(3D)graphene is reported.FeS2 nanoparticles can shorten the Na+diffusion distance during the sodiation-desodiation process.Porous carbon nanorods and 3D graphene not only improve conductivity but also provide double protection to alleviate the volume variation of FeS2 during cycling.Consequently,FeS2@C/G exhibits excellent cyclability(83.3%capacity retention after 300 cycles at 0.5A·g−1 with a capacity of 615.1 mA·h·g−1)and high rate capacity(475.1 mA·h·g−1 at 5A·g−1 after 2000 cycles).The pseudocapacitive process is evaluated and confirmed to significantly contribute to the high rate capacity of FeS2@C/G.展开更多
An efficient photo-Fenton catalyst(Fe S_(2)@HTCN)was designed by maximizing the synergistic effect of Fe S_(2)nanoparticles and hollow tubular g-C_(3)N_(4)(HTCN).Molecule self-assembly and molten salts-assisted calcin...An efficient photo-Fenton catalyst(Fe S_(2)@HTCN)was designed by maximizing the synergistic effect of Fe S_(2)nanoparticles and hollow tubular g-C_(3)N_(4)(HTCN).Molecule self-assembly and molten salts-assisted calcination were used to engineering the hollow structured g-C_(3)N_(4)before anchoring Fe S_(2)nanoparticles on the walls of HTCN via reflux method.Compared to bulk g-C_(3)N_(4),the unique structure of HTCN and heterojunction in the composite endowed FeS_(2)@HTCN with more active sites and abundant channels for electron transfer and charge separation.The enriched electrons can improve the Fe^(3+) recycling and boost Fe^(2+) catalyzed ^(·)OH production via H_(2)O_(2).As-prepared photo-Fenton catalyst was successfully applied to the treatment of industrial paint wastewater.The paint wastewater with its COD as high as 8200 mg/L can be effectively degraded with 0.2 mol/L H_(2)O_(2)in 90 min under visible light irradiation.The photoFenton system was further evaluated according to the process stability and economic benefit,proving that the strategy presented in this work would be applicable to the treatment of real wastewater.展开更多
基金supported by University Grants Commission (UGC),Govt.of India under project 39-508/2010(SR)
文摘In this paper,we have reported the synthesis of FeS2 of higher band gap energy（2.75 eV） by using capping reagent and its successive application in organic-inorganic based hybrid solar cells.Hydrothermal route was adopted for preparing iron pyrite（FeS2） nanoparticles with capping reagent PEG-400.The quality of synthesized FeS2 material was confirmed by X-ray diffraction,field emission scanning electron microscopy,transmission electron microscopy,Fourier transform infrared,thermogravimetric analyzer,and Raman study.The optical band gap energy and electro-chemical band gap energy of the synthesized FeS2 were investigated by UV-vis spectrophotometry and cyclic voltammetry.Finally band gap engineered FeS2 has been successfully used in conjunction with conjugated polymer MEHPPV for harvesting solar energy.The energy conversion efficiency was obtained as 0.064%with a fill-factor of 0.52.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 51775366).
文摘FeS2 has drawn tremendous attention as electrode material for sodium-ion batteries(SIBs)due to its high theoretical capacity and abundant resources.However,it suffers from severe volume expansion and dull reaction kinetics during the cycling process,leading to poor rate capacity and short cyclability.Herein,a well-designed FeS2@C/G composite constructed by FeS2 nanoparticles embedded in porous carbon nanorods(FeS2@C)and covered by three-dimensional(3D)graphene is reported.FeS2 nanoparticles can shorten the Na+diffusion distance during the sodiation-desodiation process.Porous carbon nanorods and 3D graphene not only improve conductivity but also provide double protection to alleviate the volume variation of FeS2 during cycling.Consequently,FeS2@C/G exhibits excellent cyclability(83.3%capacity retention after 300 cycles at 0.5A·g−1 with a capacity of 615.1 mA·h·g−1)and high rate capacity(475.1 mA·h·g−1 at 5A·g−1 after 2000 cycles).The pseudocapacitive process is evaluated and confirmed to significantly contribute to the high rate capacity of FeS2@C/G.
基金the Natural National Science Foundation of China(No.51973083)National First-Class Discipline Program of Food Science and Technology(No.JUFSTR20180301)+1 种基金China Postdoctoral Science Foundation(No.2019M651688)Fundamental Research Funds for the Central Universities(No.JUSRP22027)。
文摘An efficient photo-Fenton catalyst(Fe S_(2)@HTCN)was designed by maximizing the synergistic effect of Fe S_(2)nanoparticles and hollow tubular g-C_(3)N_(4)(HTCN).Molecule self-assembly and molten salts-assisted calcination were used to engineering the hollow structured g-C_(3)N_(4)before anchoring Fe S_(2)nanoparticles on the walls of HTCN via reflux method.Compared to bulk g-C_(3)N_(4),the unique structure of HTCN and heterojunction in the composite endowed FeS_(2)@HTCN with more active sites and abundant channels for electron transfer and charge separation.The enriched electrons can improve the Fe^(3+) recycling and boost Fe^(2+) catalyzed ^(·)OH production via H_(2)O_(2).As-prepared photo-Fenton catalyst was successfully applied to the treatment of industrial paint wastewater.The paint wastewater with its COD as high as 8200 mg/L can be effectively degraded with 0.2 mol/L H_(2)O_(2)in 90 min under visible light irradiation.The photoFenton system was further evaluated according to the process stability and economic benefit,proving that the strategy presented in this work would be applicable to the treatment of real wastewater.
