Super capacitor based on cobalt-based material

Abstract

The invention relates to a super capacitor based on a cobalt-based material, which belongs to the technical field of super capacitors. The technical problem to be solved by the invention is to provide a low-cost super capacitor based on a cobalt-based material. The super capacitor comprises an electrolyte and an electrode material, potassium ferricyanide is added into the electrolyte, and the electrode material is cobalt molybdate, cobalt vanadate, cobalt boride, cobalt hydroxide or cobalt oxide. Through mutual cooperation of the electrolyte additive [K3Fe(CN)6] and the electrode material, the conductivity of the electrode is improved, the output specific capacity of the capacitor is obviously improved, and the specific capacitance of the composite material is obviously improved. The preparation method of the super capacitor is simple, the raw materials are easy to obtain, the thermal stability is good, and the cycle performance is excellent.

Description

Technical field

[0001] The present invention relates to a supercapacitor based on a cobalt-based material, belonging to the technical field of supercapacitor. Background technique

[0002] Super capacitor is a common electrochemical energy storage system with high charge and discharge efficiency, wide operating temperature range, long service life, and green environmental protection. It is widely used in people's daily lives such as brake systems, and backup power supply. Wait.

[0003] The supercapacitor is mainly composed of a positive electrode material, an anode material, a collector, a diaphragm, and an electrolyte. Electrode materials are important constituent elements, and the advantages and disadvantage of electrochemical performance will directly affect the overall performance of the supercapacitor. The choice of the electrolyte also has a great impact on the performance of the supercapacitor. Because only when the electrolyte can be stably present, the supercapacitor ca...

Examples

Embodiment 1

[0058] 1G CoCl 2 · 6h 2 O and 1.02G NA 2 MOO 4 The obtained homogeneous solution was transferred to the inner lined stainless steel high pressure reactor, and a clean foam is placed in a reactor in an oven in an oven at 120 ° C. Cobalt molybdate COMOO 4 Electrode material.

[0059] The standard three-electrode system is used, the PT electrode is used for electrodes, saturated glycine electrodes to reference electrodes, cobalt molybdate cobalt COMOO 4 The electrode material is a working electrode, and the addition of 0.01 mol / L, 0.02 mol / L, 0.03 mol / L, 0.04mol / L, and 0.05mol / L of K in the KOH electrolyte of 2 mol / L. 3 Fe (CN) 6 Circulating voltammetry (potential window is -0.2V to 0.6V, scan rate is 20mv S -1 ) And constant current charge and discharge curve (current density is 1A g -1 ) figure 1 with figure 2 .

[0060] From figure 2 It can be seen that add 0.04mol / L K 3 Fe (CN) 6 The specific capacitor is up to 1778F G -1 Never add K 3 Fe (CN) 6 Comparison capacitan...

Embodiment 2

[0062] Cocl of 1.05mmol 2 · 6h 2 O and 0.7mmol NA 3 V 4 O 8 The obtained homogeneous solution was dissolved in 50 ml of deionized water, and then the obtained homogeneous solution was transferred to the inner liner high-pressure reactor, and a clean foam nickel was put into the reactor, and the reaction kettle was placed in an oven at 130 ° C in an oven reaction for 3h. Cobalt Cobalt Co 3 V 2 O 8 Electrode material.

[0063] The standard three-electrode system is used, and the PT electrode is used for electrodes, saturated glycine electrodes for reference electrodes, cobalt vanadate CO 3 V 2 O 8 The electrode material is a working electrode, and the addition of 0.01 mol / L, 0.02 mol / L, 0.03 mol / L, 0.04mol / L, and 0.05mol / L of K in the KOH electrolyte of 2 mol / L. 3 Fe (CN) 6 Circulating voltammetry (potential window is -0.2V to 0.6V, scan rate is 20mv S -1 ) And constant current charge and discharge curve (current density is 1A g -1 ) image 3 with Figure 4 .

[0064] From...

Embodiment 3

[0066] 1g CoCl 2 · 6h 2 O Soluble in 20 ml of deionized water, placed on a magnetic stirrer, continuously stirred for 30 minutes to form a homogeneous solution. Will 0.3G NABH 4 And 0.06 g of NaOH was dissolved in 20 mL of deionized water, and then drip droplets were added dropwise to the above mixed solution, and a clean foam nickel was placed thereto, and then stirred for 3 hours to obtain a boron Cobalt COB electrode material.

[0067] The standard three-electrode system is used, the PT electrode is the counter electrode, the saturated glycine electrode is the reference electrode, the boride COB electrode material is a working electrode, and 0.01 mol / l, 0.02 mol, respectively, at 2 mol / L of KOH electrolyte, respectively. / L, 0.03mol / L, 0.04mol / L and 0.05mol / L of K 3 Fe (CN) 6 The circulating voltammetry (potential window is (-0.2V to 0.6V, the scan rate is 20mv s) -1 ) And constant current charge and discharge curve (current density is 1A g -1 ) Figure 5 with Image 6 .

...

Technical field

[0001] The present invention relates to a supercapacitor based on a cobalt-based material, belonging to the technical field of supercapacitor. Background technique

[0002] Super capacitor is a common electrochemical energy storage system with high charge and discharge efficiency, wide operating temperature range, long service life, and green environmental protection. It is widely used in people's daily lives such as brake systems, and backup power supply. Wait.

[0003] The supercapacitor is mainly composed of a positive electrode material, an anode material, a collector, a diaphragm, and an electrolyte. Electrode materials are important constituent elements, and the advantages and disadvantage of electrochemical performance will directly affect the overall performance of the supercapacitor. The choice of the electrolyte also has a great impact on the performance of the supercapacitor. Because only when the electrolyte can be stably present, the supercapacitor ca...

Examples

Embodiment 1

[0058] 1G CoCl 2 · 6h 2 O and 1.02G NA 2 MOO 4 The obtained homogeneous solution was transferred to the inner lined stainless steel high pressure reactor, and a clean foam is placed in a reactor in an oven in an oven at 120 ° C. Cobalt molybdate COMOO 4 Electrode material.

[0059] The standard three-electrode system is used, the PT electrode is used for electrodes, saturated glycine electrodes to reference electrodes, cobalt molybdate cobalt COMOO 4 The electrode material is a working electrode, and the addition of 0.01 mol / L, 0.02 mol / L, 0.03 mol / L, 0.04mol / L, and 0.05mol / L of K in the KOH electrolyte of 2 mol / L. 3 Fe (CN) 6 Circulating voltammetry (potential window is -0.2V to 0.6V, scan rate is 20mv S -1 ) And constant current charge and discharge curve (current density is 1A g -1 ) figure 1 with figure 2 .

[0060] From figure 2 It can be seen that add 0.04mol / L K 3 Fe (CN) 6 The specific capacitor is up to 1778F G -1 Never add K 3 Fe (CN) 6 Comparison capacitan...

Embodiment 2

[0062] Cocl of 1.05mmol 2 · 6h 2 O and 0.7mmol NA 3 V 4 O 8 The obtained homogeneous solution was dissolved in 50 ml of deionized water, and then the obtained homogeneous solution was transferred to the inner liner high-pressure reactor, and a clean foam nickel was put into the reactor, and the reaction kettle was placed in an oven at 130 ° C in an oven reaction for 3h. Cobalt Cobalt Co 3 V 2 O 8 Electrode material.

[0063] The standard three-electrode system is used, and the PT electrode is used for electrodes, saturated glycine electrodes for reference electrodes, cobalt vanadate CO 3 V 2 O 8 The electrode material is a working electrode, and the addition of 0.01 mol / L, 0.02 mol / L, 0.03 mol / L, 0.04mol / L, and 0.05mol / L of K in the KOH electrolyte of 2 mol / L. 3 Fe (CN) 6 Circulating voltammetry (potential window is -0.2V to 0.6V, scan rate is 20mv S -1 ) And constant current charge and discharge curve (current density is 1A g -1 ) image 3 with Figure 4 .

[0064] From...

Embodiment 3

[0066] 1g CoCl 2 · 6h 2 O Soluble in 20 ml of deionized water, placed on a magnetic stirrer, continuously stirred for 30 minutes to form a homogeneous solution. Will 0.3G NABH 4 And 0.06 g of NaOH was dissolved in 20 mL of deionized water, and then drip droplets were added dropwise to the above mixed solution, and a clean foam nickel was placed thereto, and then stirred for 3 hours to obtain a boron Cobalt COB electrode material.

[0067] The standard three-electrode system is used, the PT electrode is the counter electrode, the saturated glycine electrode is the reference electrode, the boride COB electrode material is a working electrode, and 0.01 mol / l, 0.02 mol, respectively, at 2 mol / L of KOH electrolyte, respectively. / L, 0.03mol / L, 0.04mol / L and 0.05mol / L of K 3 Fe (CN) 6 The circulating voltammetry (potential window is (-0.2V to 0.6V, the scan rate is 20mv s) -1 ) And constant current charge and discharge curve (current density is 1A g -1 ) Figure 5 with Image 6 .

...

Images