Transition metal molybdates/carbonates and hybrid nanomaterials have attracted great attention in energy storage applications because of their enriched redox activity,good electronic conductivity,and stable crystallin...Transition metal molybdates/carbonates and hybrid nanomaterials have attracted great attention in energy storage applications because of their enriched redox activity,good electronic conductivity,and stable crystallinity.We synthesize a multicomponent MnMoO_(4)/MnCO_(3)hybrid by a one-step hydrothermal method with urea as the reaction fuel.By controlling only the urea concentration in the initial precursor solution,the MnMoO_(4)/MnCO_(3)molecular ratio is controlled effectively,which is found to have a profound effect on the electrochemical properties of the hybrid electrodes.The electrochemical measurements show that the specific capacitance of MnMoO_(4)/MnCO_(3)hybrid is 1311 F/g,the energy density of 116.8 Wh/kg,and power density of 383 W/kg at a current density of 1 A/g with 79%capacitance retention over 5000 cycles.The fabricated asymmetric supercapacitor device exhibits good energy storage performance,including the specific capacitance of 97 F/g along with the energy density of 26.5 Wh/kg and the power density of 657 W/kg at a current density of 1 A/g and good reversibility with capacitance retention of 85%after 2000 cycles and 70%over 5000 cycles.The increase in the energy density of 900%with a mere 60%decrement in the energy density indicates its potential superior applications in high-power devices.展开更多
基金supported by the grant NRF-2019R1A5A8080290 of the National Research Foundation of KoreaSupport Center for Natural Products and Medical Materials(CRCNM)for technical support。
文摘Transition metal molybdates/carbonates and hybrid nanomaterials have attracted great attention in energy storage applications because of their enriched redox activity,good electronic conductivity,and stable crystallinity.We synthesize a multicomponent MnMoO_(4)/MnCO_(3)hybrid by a one-step hydrothermal method with urea as the reaction fuel.By controlling only the urea concentration in the initial precursor solution,the MnMoO_(4)/MnCO_(3)molecular ratio is controlled effectively,which is found to have a profound effect on the electrochemical properties of the hybrid electrodes.The electrochemical measurements show that the specific capacitance of MnMoO_(4)/MnCO_(3)hybrid is 1311 F/g,the energy density of 116.8 Wh/kg,and power density of 383 W/kg at a current density of 1 A/g with 79%capacitance retention over 5000 cycles.The fabricated asymmetric supercapacitor device exhibits good energy storage performance,including the specific capacitance of 97 F/g along with the energy density of 26.5 Wh/kg and the power density of 657 W/kg at a current density of 1 A/g and good reversibility with capacitance retention of 85%after 2000 cycles and 70%over 5000 cycles.The increase in the energy density of 900%with a mere 60%decrement in the energy density indicates its potential superior applications in high-power devices.
