As a newly emerging excellent energy storage device,supercapacitors have been widely studied due to their unique advantages.Electrode material is one of the key components that determine the performance of a supercapa...As a newly emerging excellent energy storage device,supercapacitors have been widely studied due to their unique advantages.Electrode material is one of the key components that determine the performance of a supercapacitor.Among the various electrode materials of supercapacitors,RuO_(2) has attracted great attention in the scientific community due to its high theoretical energy storage capability and excellent stability.However,most RuO_(2) materials suffer the problem of low specific surface area,causing a much lower actual capacitance value compared to the theoretical performance of the material.In this work,a mulberry-like RuO_(2) electrode material with large specific surface area(159.4 m^(2)·g^(-1))was successfully synthesized by a facial hydrothermal method.The electrochemical characterization has shown that the RuO_(2) possesses a high specific capacitance of 400 F·g^(-1) at a current density of 0.2 A·g^(-1) and good capacitance retention rate of 84.7%after 6000 charge/discharge cycles under a current density of 10 A·g^(-1).The energy densities and power densities of the RuO_(2)-AC supercapacitor vary from25.0 to 11.7 Wh·kg^(-1) and 160 to 10,560 W·kg^(-1) at current density ranging from 0.2 to 10.0 A·g^(-1),respectively.展开更多
基金the Australian Research Council Discovery Project(No.DP190102252)Queensland University of Technology Strategic Research Support FundQUT PRA scholarship。
文摘As a newly emerging excellent energy storage device,supercapacitors have been widely studied due to their unique advantages.Electrode material is one of the key components that determine the performance of a supercapacitor.Among the various electrode materials of supercapacitors,RuO_(2) has attracted great attention in the scientific community due to its high theoretical energy storage capability and excellent stability.However,most RuO_(2) materials suffer the problem of low specific surface area,causing a much lower actual capacitance value compared to the theoretical performance of the material.In this work,a mulberry-like RuO_(2) electrode material with large specific surface area(159.4 m^(2)·g^(-1))was successfully synthesized by a facial hydrothermal method.The electrochemical characterization has shown that the RuO_(2) possesses a high specific capacitance of 400 F·g^(-1) at a current density of 0.2 A·g^(-1) and good capacitance retention rate of 84.7%after 6000 charge/discharge cycles under a current density of 10 A·g^(-1).The energy densities and power densities of the RuO_(2)-AC supercapacitor vary from25.0 to 11.7 Wh·kg^(-1) and 160 to 10,560 W·kg^(-1) at current density ranging from 0.2 to 10.0 A·g^(-1),respectively.
