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Supercapacitor is an important energy storage device widely used in the automobile industry, military production, and communication equipment because of its fast charge‐discharge rate, and high power density. Herein, carbon quantum dots modified and Y3+ doped Ni3(NO3)2(OH)4 (NiY@CQDs) nanospheres are prepared by a solvothermal method and used as an electrode material. The electrochemical properties of NiY@CQDs were measured in a three‐electrode system. An asymmetric supercapacitor (ASC) cell was assembled with activated carbon (AC) as the anode and NiY@CQDs as the cathode. The electrochemical properties of the ASC device were measured in a two‐electrode system. Experimental results show the shape of NiY@CQDs is petal‐shaped and the introducing carbon quantum dots and doping Y3+ significantly increases the specific surface area, conductivity, and specific capacitance of Ni3(NO3)2(OH)4. The mass‐specific capacitance of NiY@CQDs reaches up to 2944 F g−1 at a current density of 1 A g−1. The asymmetric supercapacitor of NiY@CQDs//AC has a high energy density of 138.65 Wh kg−1 at a power density of 1500 W kg−1, displaying a wide range of application prospects in the energy storage area. [ABSTRACT FROM AUTHOR]

Metal–organic framework compounds are extensively utilized in various fields, such as electrode materials, owing to their distinctive porous structure and significant specific surface area. In this study, NiCoAl-MOF metal–organic framework precursors were synthesized by a solvothermal method, and NiAl2O4/NiCo2O4 electrode materials were prepared by the subsequent calcination of the precursor. These materials were characterized by XRD, XPS, BET tests, and SEM, and the electrochemical properties of the electrode materials were tested by CV and GCD methods. BET tests showed that NiAl2O4/NiCo2O4 has an abundant porous structure and a large specific surface area of up to 105 m2 g−1. The specific capacitance of NiAl2O4/NiCo2O4 measured by the GCD method reaches up to 2870.83 F g−1 at a current density of 1 A g−1. The asymmetric supercapacitor NiAl2O4/NiCo2O4//AC assembled with activated carbon electrodes has a maximum energy density of 166.98 W h kg−1 and a power density of 750.00 W kg−1 within a voltage window of 1.5 V. In addition, NiAl2O4/NiCo2O4 materials have good cycling stability. These advantages make it a good candidate for the application of high-performance supercapacitors. [ABSTRACT FROM AUTHOR]

Supercapacitor is an important energy storage device widely used in the automobile industry, military production, and communication equipment because of its fast charge-discharge rate, and high power density. Herein, carbon quantum dots modified and Y 3+ doped Ni 3 (NO 3 ) 2 (OH) 4 (NiY@CQDs) nanospheres are prepared by a solvothermal method and used as an electrode material. The electrochemical properties of NiY@CQDs were measured in a three-electrode system. An asymmetric supercapacitor (ASC) cell was assembled with activated carbon (AC) as the anode and NiY@CQDs as the cathode. The electrochemical properties of the ASC device were measured in a two-electrode system. Experimental results show the shape of NiY@CQDs is petal-shaped and the introducing carbon quantum dots and doping Y 3+ significantly increases the specific surface area, conductivity, and specific capacitance of Ni 3 (NO 3 ) 2 (OH) 4 . The mass-specific capacitance of NiY@CQDs reaches up to 2944 F g -1 at a current density of 1 A g -1 . The asymmetric supercapacitor of NiY@CQDs//AC has a high energy density of 138.65 Wh kg -1 at a power density of 1500 W kg -1 , displaying a wide range of application prospects in the energy storage area., (© 2024 Wiley‐VCH GmbH.)

Metal-organic framework compounds are extensively utilized in various fields, such as electrode materials, owing to their distinctive porous structure and significant specific surface area. In this study, NiCoAl-MOF metal-organic framework precursors were synthesized by a solvothermal method, and NiAl 2 O 4 /NiCo 2 O 4 electrode materials were prepared by the subsequent calcination of the precursor. These materials were characterized by XRD, XPS, BET tests, and SEM, and the electrochemical properties of the electrode materials were tested by CV and GCD methods. BET tests showed that NiAl 2 O 4 /NiCo 2 O 4 has an abundant porous structure and a large specific surface area of up to 105 m 2 g -1 . The specific capacitance of NiAl 2 O 4 /NiCo 2 O 4 measured by the GCD method reaches up to 2870.83 F g -1 at a current density of 1 A g -1 . The asymmetric supercapacitor NiAl 2 O 4 /NiCo 2 O 4 //AC assembled with activated carbon electrodes has a maximum energy density of 166.98 W h kg -1 and a power density of 750.00 W kg -1 within a voltage window of 1.5 V. In addition, NiAl 2 O 4 /NiCo 2 O 4 materials have good cycling stability. These advantages make it a good candidate for the application of high-performance supercapacitors.