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Preparation method and application of NiO/Co3O4

A reaction kettle and hydrothermal reaction technology, which is applied in the field of electrocatalysis and material engineering, can solve the problems of affecting the catalytic efficiency of the catalyst, the contribution of the active site, and the complicated operation, so as to shorten the electron transmission path, simplify the preparation process, and improve the activity. Effect

Active Publication Date: 2020-05-26
LANZHOU UNIVERSITY
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Problems solved by technology

But the disadvantage is that NiO and Co 3 o 4 Scattered on the nanoribbons, there is no good interface between the two, the carbon nanoribbons improve the conductivity very well, but contribute little to the active sites, so at higher current densities However, a higher overpotential is still required to promote the reaction, showing a Tafel slope of 73 mV / dec
Since it is a powder sample, a binder needs to be added and coated on the surface of the electrode in the catalytic reaction, the operation is complicated and part of the performance will be sacrificed
These reports all show that the combination of two or more catalytic materials can effectively improve the catalytic activity of the catalyst, but the selection of materials in each phase in the composite structure is very important, and the design of the specific composite structure will affect the final catalytic performance of the entire catalyst. efficiency

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  • Preparation method and application of NiO/Co3O4
  • Preparation method and application of NiO/Co3O4
  • Preparation method and application of NiO/Co3O4

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Experimental program
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Effect test

Embodiment 1

[0030] A NiO / Co 3 o 4 The preparation method of the composite is to weigh 0.435 g of nickel nitrate hexahydrate, 0.450 g of urea, and 0.111 g of ammonium fluoride, add deionized water and stir at room temperature to prepare a 60 mL transparent solution, and the solution filling ratio in the reactor is 60vol. %, the concentrations of nickel nitrate hexahydrate, ammonium fluoride, and urea in the solution can be calculated to be 25 mmol / L, 50 mmol / L, and 125 mmol / L, respectively. The solution was then transferred to a polytetrafluoroethylene substrate in a 100 mL reactor, and the filling ratio of the solution was 60 vol.%. Add the cleaned 2×2 cm foam nickel substrate, tighten the stainless steel metal cover of the reaction kettle, and place it in a blast drying oven for hydrothermal reaction. The hydrothermal temperature is 110 °C and the time is 10 h. After cooling to room temperature, the nickel foam was taken out, rinsed with deionized water and alcohol, and then dried at ...

Embodiment 2

[0032] A NiO / Co 3 o 4 The preparation method of the complex is to weigh nickel nitrate hexahydrate, urea and ammonium fluoride 0.290 g, 0.300 g, and 0.074 g respectively, add deionized water and stir at room temperature to form a 40 mL solution. The filling ratio of the solution in the reactor is 40vol.%, the concentrations of nickel nitrate hexahydrate, ammonium fluoride, and urea in the solution can be calculated to be 25 mmol / L, 50 mmol / L, and 125 mmol / L, respectively. The resulting solution was transferred to a 100 mL reactor with a solution filling ratio of 40 vol.%. And add the cleaned 1×1 cm foam nickel as the growth substrate. Hydrothermal reaction at 90 °C for 36 h. After cooling to room temperature, the nickel foam was taken out, rinsed several times with deionized water and alcohol, and then dried at 60 °C to obtain the precursor of nickel oxide grown on the nickel foam substrate. The precursor was placed in a muffle furnace, kept at 300 °C for 6 h at a heating ...

Embodiment 3

[0034] A NiO / Co 3 o 4 The preparation method of the composite is to weigh 0.580 g of nickel nitrate hexahydrate, 0.600 g of urea, and 0.148 g of ammonium fluoride, and add deionized water to prepare 80 mL of uniform and transparent green solution. The filling ratio of the solution in the reactor is 80vol.%. Similarly, the concentrations of nickel nitrate hexahydrate, ammonium fluoride, and urea in the solution can be calculated to be 25 mmol / L, 50 mmol / L, and 125 mmol / L, respectively. The solution was then transferred to a 100 mL reactor with a filling ratio of 80 vol.%. And put the cleaned nickel foam base of 2×3 cm in size, and put it in a blast drying oven for hydrothermal reaction. The hydrothermal temperature is 160 °C and the time is 5 h. That is, the precursor of nickel oxide grown on the nickel foam substrate is obtained. The precursor was placed in a muffle furnace, held at 450 °C for 1 h at a heating rate of 10 °C / min, and cooled to room temperature with the furn...

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Abstract

The invention discloses a preparation method of a nickel oxide-cobaltosic oxide (NiO / Co3O4) composite electrode material based on foamed nickel growth. The process comprises the following steps of: firstly, preparing a precursor of nickel oxide through a hydrothermal method by taking nickel nitrate and urea as raw materials, ammonium fluoride as a morphology control agent and foamed nickel as a substrate, carrying out low-temperature annealing on the precursor in air to obtain pure NiO, and then taking the nickel oxide as a substrate material, adding a cobalt acetate solution and ammonia water, and carrying out a second-step hydrothermal reaction to obtain the NiO / Co3O4 two-phase composite electrocatalyst material growing on a foamed nickel substrate. A plurality of interfaces and defectsbeneficial to catalytic reaction appear in the material, and compared with a single-phase catalyst, the catalytic activity is greatly improved. And meanwhile, due to the use of the foamed nickel substrate, the addition of a conductive agent and an adhesive in the electrocatalysis process can be avoided, the implementation process of the catalytic reaction is simplified, and the electrode impedanceis also reduced.

Description

technical field [0001] The invention belongs to the field of material engineering technology and the field of electrocatalysis, in particular to a NiO / Co electrocatalyst for oxygen evolution 3 o 4 Method for the preparation of the complex. Background technique [0002] Traditional fossil energy is non-renewable and its products cause serious environmental pollution. Therefore, finding a new generation of clean energy and realizing its sustainable development is a new topic in the field of energy storage and conversion. Among many new energy production devices, electrolyzed water is an effective way to obtain clean new energy with great development prospects. As one of the half-reactions of the water splitting system, the oxygen evolution reaction is a complex multi-electron process, and its slow kinetic speed greatly hinders the efficiency of the whole water splitting reaction. Therefore, catalysts are needed to accelerate the reaction and reduce energy consumption. At p...

Claims

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Application Information

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IPC IPC(8): B01J23/755C25B1/04C25B11/06
CPCB01J23/755B01J23/002C25B1/04C25B11/091B01J35/33Y02E60/36
Inventor 高大强张景艳姜兴东
Owner LANZHOU UNIVERSITY
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