Microwave preparation method for 3D zinc-aluminum double-metal hydroxides, and application in super capacitor

Abstract

The invention belongs to the chemical field, and provides a microwave preparation method for 3D zinc-aluminum double-metal hydroxides, and an application in a super capacitor. Compared to the prior art, during the microwave preparation of the 3D double-metal hydroxides, the reaction is rapid, the energy consumption is small, and the yield can reach 98%. The 3D double-metal hydroxides obtained by use of the method have the advantages of larger specific surface, smaller mass transfer resistance and better structural stability. Besides, the synthesized 3D zinc-aluminum double-metal hydroxides are applied to the electrode material of the super capacitor, and the cost and the performance are better than the cost and performance of conventional precious metal oxides.

Description

technical field

[0001] The invention belongs to the field of chemical industry, and in particular relates to a microwave preparation method of 3D zinc-aluminum double metal hydroxide and its application in supercapacitors. Background technique

[0002] Supercapacitor is a new type of energy storage / conversion device with high energy density and power density, which is expected to be applied in various fields of defense, machinery, electronics and daily consumption. According to the energy storage mechanism, supercapacitors can be divided into electric double-layer capacitors and Faraday quasi-capacitors. The former uses the electric double layer generated by the directional arrangement of electrons and ions or dipoles on the electrode / solution surface to store charges, while the latter uses electrochemically active substances to generate chemical reactions in the quasi-two-dimensional space of the electrode surface or bulk phase. Faradaic quasi-capacitance due to adsorption...

Examples

Embodiment 1

[0036] Weigh 0.582gZn(NO 3 ) 2 ·6H 2 O and 0.873g Al(NO 3 ) 3 9H 2 O in 150mL of absolute ethanol, turn on the microwave reaction device, set the lower limit of the reaction temperature to 50°C, the upper limit to 80°C, and the microwave power to about 200W, stir and dissolve the reaction system until the system starts to reflux, and slowly add 10mL of pre-configured ethanol- Ammonia water (V:V=10:1) was mixed with the solution, and the microwave power was adjusted to about 250W, and the dropwise addition was completed within 0.5h, and the reaction was continued for 1h. Close the reaction to end, cool at room temperature, vacuum filter, wash with ethanol for 5 times, and dry at 70° C. for 12 hours in vacuum to obtain 3D zinc-aluminum double metal hydroxide. Grind and mix 30mg3D zinc-aluminum double metal hydroxide hollow microspheres and 5.6mg acetylene black, add a little polytetrafluoroethylene binder (15%), add a small amount of absolute ethanol, ultrasonically dispers...

Embodiment 2

[0038] Weigh 0.582gZn(NO 3 ) 2 ·6H 2 O and 0.873g Al(NO 3 ) 3 9H 2 O in 150mL of absolute ethanol, turn on the microwave reaction device, set the lower limit of the reaction temperature to 60°C, the upper limit to 80°C, and the microwave power to about 250W, stir and dissolve the reaction system until the system starts to reflux, and slowly add 10mL of pre-configured ethanol- Ammonia water (V:V=10:1) was mixed with the solution, and the microwave power was adjusted to about 300W, and the dropwise addition was completed within 0.5h, and the reaction was continued for 1h. Finish the reaction, cool at room temperature, vacuum filter, wash with ethanol for 6 times, and dry in vacuum at 70° C. for 12 hours to obtain 3D zinc-aluminum double metal hydroxide. Grind and mix 30mg3D zinc-aluminum double metal hydroxide hollow microspheres and 5.6mg acetylene black, add a little polytetrafluoroethylene binder (15%), add a small amount of absolute ethanol, ultrasonically disperse for ...

Embodiment 3

[0040] Weigh 0.582gZn(NO 3 ) 2 ·6H 2 O and 0.873g Al(NO 3 ) 3 9H 2 O in 150mL of absolute ethanol, turn on the microwave reaction device, set the lower limit of the reaction temperature to 65°C, the upper limit to 80°C, and the microwave power to about 300W, stir and dissolve the reaction system until the system starts to reflux, and slowly add 10mL of pre-configured ethanol- Ammonia water (V:V=10:1) was mixed with the solution, and the microwave power was adjusted to about 350W, and the dropwise addition was controlled for 0.5h, and the reaction was continued for 1h. Finish the reaction, cool at room temperature, vacuum filter, wash with ethanol 8 times, and dry at 70° C. for 12 hours in vacuum to obtain 3D zinc-aluminum double metal hydroxide. Grind and mix 30mg3D zinc-aluminum double metal hydroxide hollow microspheres and 5.6mg acetylene black, add a little polytetrafluoroethylene binder (15%), add a small amount of absolute ethanol, ultrasonically disperse for 30min,...

technical field

[0001] The invention belongs to the field of chemical industry, and in particular relates to a microwave preparation method of 3D zinc-aluminum double metal hydroxide and its application in supercapacitors. Background technique

[0002] Supercapacitor is a new type of energy storage / conversion device with high energy density and power density, which is expected to be applied in various fields of defense, machinery, electronics and daily consumption. According to the energy storage mechanism, supercapacitors can be divided into electric double-layer capacitors and Faraday quasi-capacitors. The former uses the electric double layer generated by the directional arrangement of electrons and ions or dipoles on the electrode / solution surface to store charges, while the latter uses electrochemically active substances to generate chemical reactions in the quasi-two-dimensional space of the electrode surface or bulk phase. Faradaic quasi-capacitance due to adsorption...

Examples

Embodiment 1

[0036] Weigh 0.582gZn(NO 3 ) 2 ·6H 2 O and 0.873g Al(NO 3 ) 3 9H 2 O in 150mL of absolute ethanol, turn on the microwave reaction device, set the lower limit of the reaction temperature to 50°C, the upper limit to 80°C, and the microwave power to about 200W, stir and dissolve the reaction system until the system starts to reflux, and slowly add 10mL of pre-configured ethanol- Ammonia water (V:V=10:1) was mixed with the solution, and the microwave power was adjusted to about 250W, and the dropwise addition was completed within 0.5h, and the reaction was continued for 1h. Close the reaction to end, cool at room temperature, vacuum filter, wash with ethanol for 5 times, and dry at 70° C. for 12 hours in vacuum to obtain 3D zinc-aluminum double metal hydroxide. Grind and mix 30mg3D zinc-aluminum double metal hydroxide hollow microspheres and 5.6mg acetylene black, add a little polytetrafluoroethylene binder (15%), add a small amount of absolute ethanol, ultrasonically dispers...

Embodiment 2

[0038] Weigh 0.582gZn(NO 3 ) 2 ·6H 2 O and 0.873g Al(NO 3 ) 3 9H 2 O in 150mL of absolute ethanol, turn on the microwave reaction device, set the lower limit of the reaction temperature to 60°C, the upper limit to 80°C, and the microwave power to about 250W, stir and dissolve the reaction system until the system starts to reflux, and slowly add 10mL of pre-configured ethanol- Ammonia water (V:V=10:1) was mixed with the solution, and the microwave power was adjusted to about 300W, and the dropwise addition was completed within 0.5h, and the reaction was continued for 1h. Finish the reaction, cool at room temperature, vacuum filter, wash with ethanol for 6 times, and dry in vacuum at 70° C. for 12 hours to obtain 3D zinc-aluminum double metal hydroxide. Grind and mix 30mg3D zinc-aluminum double metal hydroxide hollow microspheres and 5.6mg acetylene black, add a little polytetrafluoroethylene binder (15%), add a small amount of absolute ethanol, ultrasonically disperse for ...

Embodiment 3

[0040] Weigh 0.582gZn(NO 3 ) 2 ·6H 2 O and 0.873g Al(NO 3 ) 3 9H 2 O in 150mL of absolute ethanol, turn on the microwave reaction device, set the lower limit of the reaction temperature to 65°C, the upper limit to 80°C, and the microwave power to about 300W, stir and dissolve the reaction system until the system starts to reflux, and slowly add 10mL of pre-configured ethanol- Ammonia water (V:V=10:1) was mixed with the solution, and the microwave power was adjusted to about 350W, and the dropwise addition was controlled for 0.5h, and the reaction was continued for 1h. Finish the reaction, cool at room temperature, vacuum filter, wash with ethanol 8 times, and dry at 70° C. for 12 hours in vacuum to obtain 3D zinc-aluminum double metal hydroxide. Grind and mix 30mg3D zinc-aluminum double metal hydroxide hollow microspheres and 5.6mg acetylene black, add a little polytetrafluoroethylene binder (15%), add a small amount of absolute ethanol, ultrasonically disperse for 30min,...