In this work,a novel chalcopyrite(CuFeS_(2))platelet like open-pored micro-flower structured electrode material was synthesized via a one-step hydrothermal method and its electrochemical performance as an electrode ma...In this work,a novel chalcopyrite(CuFeS_(2))platelet like open-pored micro-flower structured electrode material was synthesized via a one-step hydrothermal method and its electrochemical performance as an electrode material for supercapacitors were investigated.First and foremost,the structural,morphological,vibrational,and chemical compositional characteristics of the as prepared CuFeS_(2)were investigated by X-ray diffraction(XRD),field emission scanning electron microscopy(FE-SEM)with elemental mapping,laser Raman spectroscopy,and X-ray photoelectron spectroscopy(XPS),respectively.Subsequently,the electrochemical properties of the CuFeS_(2)electrode were explored using cyclic voltammetry(CV),galvanostatic charge-discharge(CD),and electrochemical impedance spectroscopy(EIS)studies in 1 M LiOH electrolyte.Cyclic voltammetry and charge-discharge analysis reveal the pseudocapacitive nature of the CuFeS_(2)electrode by obtaining a maximum specific capacity of about 26.46 mA h g^(-1)(specific capacitance of about∼95.28 F g^(-1))at a scan rate of 5 mV s^(-1)with a cycling stability retention of 94.38%even after 2000 cycles at a discharge current rate of 5 mA.Furthermore,in view of practical application a symmetric supercapacitor device was fabricated using the CuFeS_(2)electrode which delivered a maximum specific capacitance of about 34.18 F g^(-1)at a current rate of 1 mA and a maximum energy density of about 4.74 W h kg^(-1)with excellent cycling stability.The acquired results confirmed that the CuFeS_(2)electrode could be a prospective and electrochemically active candidate for next generation supercapacitors.展开更多
A novel hybrid of Cu_(2)MoS_(4) nanoparticles embedded on reduced graphene oxide(rGO)sheets was prepared via a one-pot hydrothermal method without any surfactants or templates.The electrochemical properties of the as-...A novel hybrid of Cu_(2)MoS_(4) nanoparticles embedded on reduced graphene oxide(rGO)sheets was prepared via a one-pot hydrothermal method without any surfactants or templates.The electrochemical properties of the as-prepared Cu_(2)MoS_(4)-rGO electrode were investigated as an advanced electrode for supercapacitor applications,and it exhibited higher specific capacitance(231.51 F g^(-1) at 5 mV s^(-1))compared to the pristine Cu_(2)MoS_(4) electrode(135.78 F g^(-1) at 5 mV s^(-1)).展开更多
Molybdenum sulfide materials receive high attention as high-performance electrodes for electrochemical energy storage devices.In this study,we investigate the electrochemical energy storage properties of amorphous MoS...Molybdenum sulfide materials receive high attention as high-performance electrodes for electrochemical energy storage devices.In this study,we investigate the electrochemical energy storage properties of amorphous MoS_(3) and crystalline MoS_(2) materials(prepared via thermal decomposition of ammonium tetrathiomolybdate)using an organic liquid electrolyte.Physicochemical characterization using X-ray diffraction pattern and laser Raman analysis confirms the formation of amorphous MoS_(3) and crystalline MoS_(2),respectively.The energy storage properties of MoS_(3) and MoS_(2) based symmetric supercapacitor devices were comparatively studied using cyclic voltammetry,electrochemical impedance spectroscopy,and galvanostatic charge–discharge analysis.The cyclic voltammetry analysis reveals the mechanism of charge storage in MoS_(3) and MoS_(2) is due to the ion-intercalation/de-intercalation pseudocapacitance.Electrochemical impedance spectroscopy studies reveal the better capacitance and charge-transfer nature of the crystalline MoS_(2) symmetric supercapacitor compared to that of the amorphous MoS_(3) symmetric supercapacitor.The charge–discharge analysis suggests that the MoS_(2) symmetric supercapacitor device possesses better electrochemical energy storage properties with a high specific capacity of 20.81 mA h g^(−1)(24.98 F g^(−1))and energy density of about 20.69 W h kg^(−1) with the excellent cyclic stability of about 2000 cycles.The experimental results suggest that the crystalline MoS_(2) sheets might be a better choice than amorphous MoS_(3) as an electrode material for supercapacitors using an organic liquid electrolyte.展开更多
基金supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(2017R1C1B2012700,2018R1A4A1025998,and 2019R1A2C3009747).
文摘In this work,a novel chalcopyrite(CuFeS_(2))platelet like open-pored micro-flower structured electrode material was synthesized via a one-step hydrothermal method and its electrochemical performance as an electrode material for supercapacitors were investigated.First and foremost,the structural,morphological,vibrational,and chemical compositional characteristics of the as prepared CuFeS_(2)were investigated by X-ray diffraction(XRD),field emission scanning electron microscopy(FE-SEM)with elemental mapping,laser Raman spectroscopy,and X-ray photoelectron spectroscopy(XPS),respectively.Subsequently,the electrochemical properties of the CuFeS_(2)electrode were explored using cyclic voltammetry(CV),galvanostatic charge-discharge(CD),and electrochemical impedance spectroscopy(EIS)studies in 1 M LiOH electrolyte.Cyclic voltammetry and charge-discharge analysis reveal the pseudocapacitive nature of the CuFeS_(2)electrode by obtaining a maximum specific capacity of about 26.46 mA h g^(-1)(specific capacitance of about∼95.28 F g^(-1))at a scan rate of 5 mV s^(-1)with a cycling stability retention of 94.38%even after 2000 cycles at a discharge current rate of 5 mA.Furthermore,in view of practical application a symmetric supercapacitor device was fabricated using the CuFeS_(2)electrode which delivered a maximum specific capacitance of about 34.18 F g^(-1)at a current rate of 1 mA and a maximum energy density of about 4.74 W h kg^(-1)with excellent cycling stability.The acquired results confirmed that the CuFeS_(2)electrode could be a prospective and electrochemically active candidate for next generation supercapacitors.
基金supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIT)(2018R1A4A1025998,2019R1A2C3009747).
文摘A novel hybrid of Cu_(2)MoS_(4) nanoparticles embedded on reduced graphene oxide(rGO)sheets was prepared via a one-pot hydrothermal method without any surfactants or templates.The electrochemical properties of the as-prepared Cu_(2)MoS_(4)-rGO electrode were investigated as an advanced electrode for supercapacitor applications,and it exhibited higher specific capacitance(231.51 F g^(-1) at 5 mV s^(-1))compared to the pristine Cu_(2)MoS_(4) electrode(135.78 F g^(-1) at 5 mV s^(-1)).
基金supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(2018R1A4A1025998 and 2019R1A2C3009747).
文摘Molybdenum sulfide materials receive high attention as high-performance electrodes for electrochemical energy storage devices.In this study,we investigate the electrochemical energy storage properties of amorphous MoS_(3) and crystalline MoS_(2) materials(prepared via thermal decomposition of ammonium tetrathiomolybdate)using an organic liquid electrolyte.Physicochemical characterization using X-ray diffraction pattern and laser Raman analysis confirms the formation of amorphous MoS_(3) and crystalline MoS_(2),respectively.The energy storage properties of MoS_(3) and MoS_(2) based symmetric supercapacitor devices were comparatively studied using cyclic voltammetry,electrochemical impedance spectroscopy,and galvanostatic charge–discharge analysis.The cyclic voltammetry analysis reveals the mechanism of charge storage in MoS_(3) and MoS_(2) is due to the ion-intercalation/de-intercalation pseudocapacitance.Electrochemical impedance spectroscopy studies reveal the better capacitance and charge-transfer nature of the crystalline MoS_(2) symmetric supercapacitor compared to that of the amorphous MoS_(3) symmetric supercapacitor.The charge–discharge analysis suggests that the MoS_(2) symmetric supercapacitor device possesses better electrochemical energy storage properties with a high specific capacity of 20.81 mA h g^(−1)(24.98 F g^(−1))and energy density of about 20.69 W h kg^(−1) with the excellent cyclic stability of about 2000 cycles.The experimental results suggest that the crystalline MoS_(2) sheets might be a better choice than amorphous MoS_(3) as an electrode material for supercapacitors using an organic liquid electrolyte.
