In-situ preparation of NiCo2Sx and NiCo2O4 on conductive substrate and application of NiCo2Sx and NiCo2O4 in energy storage device

A conductive substrate, CO2 technology, applied in nanotechnology, circuits, electrical components, etc. for materials and surface science, can solve the problems of activity reduction, deactivation, poisoning, etc., and achieve high methanol catalytic oxidation efficiency and high specific capacitance value, the effect of improving conductivity and

Inactive Publication Date: 2015-11-18
CHENGDU UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

Pt-based catalysts have been extensively studied due to their high catalytic efficiency, but there are still some bottlenecks: Pt-based catalysts are easily poisoned by methanol oxidation intermediates, resulting in reduced activity or even deactivation; on the other hand, the high price of Pt makes DMFCs more costly

Method used

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  • In-situ preparation of NiCo2Sx and NiCo2O4 on conductive substrate and application of NiCo2Sx and NiCo2O4 in energy storage device
  • In-situ preparation of NiCo2Sx and NiCo2O4 on conductive substrate and application of NiCo2Sx and NiCo2O4 in energy storage device
  • In-situ preparation of NiCo2Sx and NiCo2O4 on conductive substrate and application of NiCo2Sx and NiCo2O4 in energy storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) configuration containing Ni 2+ and Co 2+ Aqueous solutions with a concentration of 5mmol / L and 10mmol / L were used as the electrolyte, the cleaned foamed nickel substrate was used as the working electrode, the saturated calomel electrode was used as the reference electrode, and the Pt electrode was used as the counter electrode. Deposit for 30 minutes, rinse with double distilled water and dry at 60°C to obtain Ni-CoLDHs / NF electrode;

[0033] (2) The Ni-CoLDHs / NF electrode obtained in (1) was calcined in a muffle furnace at 250°C for 3 hours to obtain NiCo that can be used in supercapacitors 2 o 4 / NF electrode;

[0034] (3) NiCo in 6mol / L KOH electrolyte 2 o 4 / NF is the working electrode, Hg / HgO is the reference electrode, and graphite is the counter electrode. The capacitance performance test is carried out by cyclic voltammetry and constant current charge and discharge method. NiCo 2 o 4 / NF electrode showed better than NiO / NF and Co prepared by the same ...

Embodiment 2

[0036] (1) configuration containing Ni 2+ and Co 2+ Aqueous solutions with a concentration of 5mmol / L and 10mmol / L were used as the electrolyte, the cleaned foamed nickel substrate was used as the working electrode, the saturated calomel electrode was used as the reference electrode, and the Pt electrode was used as the counter electrode. Deposit for 30 minutes, rinse with double distilled water and dry at 60°C to obtain Ni-CoLDHs / NF electrode;

[0037] (2) Place the Ni-CoLDHs / NF electrode obtained in (1) in 0.1mol / L Na 2 React in S solution at room temperature (25°C) for 12 hours, rinse with double distilled water and dry at 60°C to obtain NiCo for supercapacitors. 2 S x / NF electrode;

[0038] (3) NiCo in 6mol / L KOH electrolyte 2 S x / NF is the working electrode, Hg / HgO is the reference electrode, and graphite is the counter electrode. The capacitance performance test is carried out by cyclic voltammetry and constant current charge and discharge method. NiCo 2 S x / N...

Embodiment 3

[0040] (1) configuration containing Ni 2+ and Co 2+ Aqueous solutions with a concentration of 10mmol / L and 20mmol / L were used as the electrolyte, a cleaned stainless steel mesh substrate was used as the working electrode, a saturated calomel electrode was used as the reference electrode, and a Pt electrode was used as the counter electrode. Deposit for 30 minutes, rinse with double distilled water and dry at 60°C to obtain Ni-CoLDHs / SS electrode;

[0041] (2) Place the Ni-CoLDHs / SS electrode obtained in (1) in 0.1mol / L Na 2 React in S solution at room temperature (25°C) for 12h, rinse with double distilled water and dry at 60°C to obtain NiCo for catalytic oxidation of methanol 2 S x / SS electrode;

[0042] (3) NiCo in 1mol / L KOH electrolyte 2 S x / SS is the working electrode, Hg / HgO is the reference electrode, and Pt is the counter electrode. Cyclic voltammetry and potentiostatic chronoamperometry are used to test the catalytic oxidation performance of methanol. NiCo 2...

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Abstract

The present invention relates to an in-situ preparation method of NiCo2Sx and NiCo2O4 on a conductive substrate and application of NiCo2Sx and NiCo2O4 in super capacitors and an anode catalyst of a direct methanol fuel cell (DMFC). The preparation method comprises two steps of electro-deposition and sulfuration (or calcination). The conductive substrate serves as a working electrode, electro-deposition is carried out under constant potential, and a cobalt-nickel layered double hydroxide (Co-Ni LDHs) is grown in situ growth. Co-Ni LDHs obtained through electro-deposition reacts with Na2S to prepare NiCo2Sx which is calcined in the air to prepare NiCo2O4. Through the two steps of electro-deposition and sulfuration (or calcination), in-situ growth of NiCo2Sx (NiCo2O4) on the conductive substrate is effectively realized, thereby avoiding usage of adhesives or conductive agents required for electrode preparation through a conventional coating method. The NiCo2Sx and NiCo2O4 grown directly on the conductive substrate can be directly used for researches of the super capacitors and anode non-platinum catalysts of the DMFCs. In an alkaline solution, NiCo2Sx and NiCo2O4 show a higher specific electric-capacity and a higher methanol catalytic oxidation efficiency than single metal sulfides such as NiSx and CoSx and single metallic oxides such as NiO and Co3O4.

Description

technical field [0001] The invention belongs to the field of transition metal compounds, in particular to two kinds of transition metal compounds NiCo which can be used as both methanol fuel cell anode catalyst and supercapacitor electrode material 2 o 4 and NiCo 2 S x In situ preparation methods on conductive substrates and their applications in new energy devices (methanol fuel cells and supercapacitors). Background technique [0002] With the rapid development of human society, the demand for energy is gradually increasing. Traditional fossil energy is non-renewable and is facing the danger of depletion, and there will be a lot of CO in the application process of traditional fossil energy 2 generated, CO 2 A large amount of emissions will lead to global warming. Therefore, energy needs to be developed in a cleaner and more environmentally friendly direction. Wind energy, solar energy, etc. are representatives of new renewable energy sources, and they are also the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/30B82Y30/00H01M4/88H01M4/90
CPCY02E60/50
Inventor 钱蕾陈文黄荣富
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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