Realizing Superior Electrochemical Performance of Asymmetric Capacitors through Tailoring Electrode Architectures

Abstract

ZnCo 2 O 4 as an electrode material for supercapacitors has been extensively investigated owing to its unique structural characteristics and high capacitance. However, the conductivity still cannot reach the level of the industrialization. In order to solve this problem, it is an efficient strategy to develop composed electrode materials. Here, we prepare ZnCo 2 O 4 -based electrode materials through a facile hydrothermal route. The ZnCo 2 O 4 /CoMoO 4 sample possesses a specific capacitance of 903 C at 1 A g −1 . An assembled asymmetric capacitor presents an energy density of 135.6 Wh kg −1 at 2704.1 W kg −1 and capacity of 95.1% after 8000 cycles.

Facile synthesis of dendritic Ni3S2 nanosheet arrays for hybrid supercapacitor electrodes

“…3f are 0.61, 0.72, and 0.62, respectively, indicating a fast kinetic reaction process, which is consistent with other reports [30,31]. In order to further investigate the charge storage mechanism of electrodes, the capacity contribution ratio can be calculated by the following equation [32]: where i, v, k 1 , and k 2 represent current, scan rate, and constant. As shown in Fig.…”

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

“…Particularly, TMOs, such as NiO [ 7 ], MoO 3 [ 8 ], Co 3 O 4 [ 9 ], and MnO 2 [ 10 ], have received considerable attention due to their low cost, convenience of synthesis, environmental friendliness, and relatively high capacitance. Compared to binary TMOs, ternary TMOs materials containing two different metal cations, such as NiCo 2 O 4 [ 11 ], ZnCo 2 O 4 [ 12 , 13 ], CoMoO 4 [ 14 ], MnMoO 4 [ 15 ], and NiMoO 4 [ 16 ], as well as some solid solutions [ 17 ], exhibit higher electrochemical activity due to the rich redox reactions stemming from the multiple oxidation states of the transition-metal components. It has been proposed that NiMoO 4 has a good reversible capacitance and electrochemical characteristics for SCs/ASCs applications because of the electrochemical active Ni cation and improved electronic conductivity from Mo cation [ 16 , 18 ].…”

Multidimensional Carbon-Modified NiCo2O4/Ni–Co–S Nanocomposite Electrode Material for High-Energy Asymmetric Supercapacitors

“…In order to compensate for the poor conductivity, stability, and rate performance of transition metal oxides, we doped carbon materials with good conductivity into NiCo 2 O 4 nanowires by a hydrothermal method. 34 Subsequently, a 2D carbon layer with a rough surface is chosen as an intermediate layer to improve the stable nanowire structure and make Ni−Co−S grow more firmly to enhance the rate stability and cycle performance. The C-NiCo 2 O 4 /C nanowires exhibit an excellent specific capacitance of 2654 F g −1 but an ordinary area-specific capacitance of 6.1 F cm −2 at 3 A g −1 current density.…”

“…First, 0D carbon quantum dots are uniformly doped into the self-assembled nanowires of NiCo 2 O 4 nanoparticles by a one-step hydrothermal method. In order to compensate for the poor conductivity, stability, and rate performance of transition metal oxides, we doped carbon materials with good conductivity into NiCo 2 O 4 nanowires by a hydrothermal method . Subsequently, a 2D carbon layer with a rough surface is chosen as an intermediate layer to improve the stable nanowire structure and make Ni–Co–S grow more firmly to enhance the rate stability and cycle performance.…”