We report a wire-shaped three-dimensional(3D)-hybrid supercapacitor with high volumetric capacitance and high energy density due to an interconnected 3D-configuration of the electrode allowing for large number of elec...We report a wire-shaped three-dimensional(3D)-hybrid supercapacitor with high volumetric capacitance and high energy density due to an interconnected 3D-configuration of the electrode allowing for large number of electrochemical active sites,easy access of electrolyte ions,and facile charge transport for flexible wearable applications.The interconnected and compact electrode delivers a high volumetric capacitance(gravimetric capacitance)of 73 F cm−3(2446 F g−1),excellent rate capability,and cycle stability.The 3D-nickel cobalt-layered double hydroxide onto 3D-nickel wire(NiCo LDH/3D-Ni)//the 3D-manganese oxide onto 3D-nickel wire(Mn3O4/3D-Ni)hybrid supercapacitor exhibits energy density of 153.3 Wh kg−1 and power density of 8810 W kg−1.The red lightemitting diode powered by the as-prepared hybrid supercapacitor can operate for 80 min after being charged for tens of seconds and exhibit excellent electrochemical stability under various deformation conditions.The results verify that such wire-shaped 3D-hybrid supercapacitors are promising alternatives for batteries with long charge–discharge times,for smart wearable and implantable devices.展开更多
为研究特高压气体绝缘开关设备的隔离开关残余电荷电压特性及其仿真方法,首先分析了残余电荷电压的几种影响因素;并在真型试验平台上开展了大量试验研究,对气体绝缘开关设备隔离开关分闸空载短母线所产生的触头间隙重复击穿过程进行了...为研究特高压气体绝缘开关设备的隔离开关残余电荷电压特性及其仿真方法,首先分析了残余电荷电压的几种影响因素;并在真型试验平台上开展了大量试验研究,对气体绝缘开关设备隔离开关分闸空载短母线所产生的触头间隙重复击穿过程进行了分析。基于试验结果,采用一元线性回归法得到触头间隙的击穿特性表达式,并在此基础上得到了残余电荷电压统计特性的仿真方法。结果表明,触头间隙正、负极性击穿电压之比约为1.3：1;正极性击穿电场强度在22~26 k V/mm之间。减小隔离开关开断速度,增大正、负极性击穿电压之差,降低SF6绝缘耐受强度都可以降低高幅值残余电荷电压的出现概率。展开更多
基金supported by national research foundation of Korea(NRF)(No.NRF-2019R1H1A2039743)S-Oil corporation,and “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning(KETEP)granted financial resource from the Ministry of Trade,Industry and Energy,Republic of Korea(No.20194010201890)
文摘We report a wire-shaped three-dimensional(3D)-hybrid supercapacitor with high volumetric capacitance and high energy density due to an interconnected 3D-configuration of the electrode allowing for large number of electrochemical active sites,easy access of electrolyte ions,and facile charge transport for flexible wearable applications.The interconnected and compact electrode delivers a high volumetric capacitance(gravimetric capacitance)of 73 F cm−3(2446 F g−1),excellent rate capability,and cycle stability.The 3D-nickel cobalt-layered double hydroxide onto 3D-nickel wire(NiCo LDH/3D-Ni)//the 3D-manganese oxide onto 3D-nickel wire(Mn3O4/3D-Ni)hybrid supercapacitor exhibits energy density of 153.3 Wh kg−1 and power density of 8810 W kg−1.The red lightemitting diode powered by the as-prepared hybrid supercapacitor can operate for 80 min after being charged for tens of seconds and exhibit excellent electrochemical stability under various deformation conditions.The results verify that such wire-shaped 3D-hybrid supercapacitors are promising alternatives for batteries with long charge–discharge times,for smart wearable and implantable devices.
文摘为研究特高压气体绝缘开关设备的隔离开关残余电荷电压特性及其仿真方法,首先分析了残余电荷电压的几种影响因素;并在真型试验平台上开展了大量试验研究,对气体绝缘开关设备隔离开关分闸空载短母线所产生的触头间隙重复击穿过程进行了分析。基于试验结果,采用一元线性回归法得到触头间隙的击穿特性表达式,并在此基础上得到了残余电荷电压统计特性的仿真方法。结果表明,触头间隙正、负极性击穿电压之比约为1.3：1;正极性击穿电场强度在22~26 k V/mm之间。减小隔离开关开断速度,增大正、负极性击穿电压之差,降低SF6绝缘耐受强度都可以降低高幅值残余电荷电压的出现概率。
