Cathode catalyst for hollow nano water electrolysis, and preparation method thereof

A cathode catalyst and electrolyzed water technology, applied in the field of electrocatalysis, can solve the problems of high potential, achieve high electrocatalytic activity, improve catalytic performance, and large specific surface area

Active Publication Date: 2020-09-29
SHAANXI UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

Prussian blue-like compounds and phosphorus source precursors can prepare transition metal phosphide electrocatalysts with excellent performance, such as CoFe-PBA, but the transition metal phosphide electrocatalysts synthesized by existing methods are at 10mA / cm 2 There is a disadvantage of high overpotential, so it is necessary to improve its synthesis

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  • Cathode catalyst for hollow nano water electrolysis, and preparation method thereof
  • Cathode catalyst for hollow nano water electrolysis, and preparation method thereof
  • Cathode catalyst for hollow nano water electrolysis, and preparation method thereof

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preparation example Construction

[0029] A method for preparing a cathode catalyst for hollow nanometer electrolyzed water of the present invention comprises two schemes, specifically as follows:

[0030] The first option:

[0031] Weigh the cobalt salt of 0.1-1mmol and the sodium citrate dihydrate of 0.5-2mmol, wherein the cobalt metal salt can be one or more of cobalt chloride hexahydrate, nitrate, sulfate and acetate, because the ratio There is no requirement, and the effect is the same, so the following examples only list each pure substance, dissolve them in 10-30mL deionized water, add potassium ferricyanide aqueous solution while stirring, and the potassium ferricyanide aqueous solution passes through 0.2-0.5 Dissolve one mmol of potassium ferricyanide in 10-30mL of deionized water and mix evenly, continue to stir for 5-30min to obtain a mixed solution, let it stand for 20-48h, centrifuge the product, wash with deionized water and absolute ethanol, After vacuum drying, CoFe-PBA cubes were synthesized b...

Embodiment 1

[0039]142.758 mg, namely 0.6 mmol of cobalt chloride hexahydrate and 264.69 mg, namely 0.9 mmol of sodium citrate dihydrate were dissolved in 20 mL of deionized water to form solution A, and 0.4 mmol of potassium ferricyanide was dissolved in 20 mL of deionized water to form solution B. Slowly pour solution A into the stirring solution B to obtain a mixed solution, let it stand for 48 hours, centrifuge, wash and vacuum dry the product for 24 hours to obtain CoFe-PBA.

[0040] Weigh 200mg of CoFe-PBA cube, put it in a small crucible, then weigh 1g of NaH 2 PO 2 Put it into a large crucible, put the small crucible in the large crucible, and react at 350°C for 2h to obtain a hollow PBA cube.

[0041] 95.172mg or 0.4mmol of cobalt chloride hexahydrate, 45.126mg or 0.2mmol of stannous chloride and 264.69mg or 0.9mmol of sodium citrate dihydrate were dissolved in 20mL of deionized water to form solution A, 0.4mmol of potassium ferricyanide Dissolve in 20mL deionized water to form ...

Embodiment 2

[0049] Dissolve 0.1mmol of cobalt chloride hexahydrate and 0.5mmol of sodium citrate dihydrate in 20mL of deionized water to form solution A, dissolve 0.3mmol of potassium ferricyanide in 20mL of deionized water to form solution B, and slowly pour solution A into In the stirring B solution, a mixed solution was obtained, which was left to stand for 20 hours, and the product was centrifuged, washed, and vacuum-dried for 24 hours to obtain CoFe-PBA.

[0050] Weigh 250mg of CoFe-PBA cube, put it in a small crucible, then weigh 2g of NaH 2 PO 2 Put it into a large crucible, put the small crucible in the large crucible, and react at 200°C for 1 hour to obtain a hollow PBA cube.

[0051] Dissolve 0.1mmol of cobalt chloride hexahydrate, 0.8mmol of stannous chloride and 0.5mmol of sodium citrate dihydrate in 20mL of deionized water to form solution A, and dissolve 0.3mmol of potassium ferricyanide in 20mL of deionized water to form solution B , slowly pour solution A into the stirri...

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Abstract

The invention provides a cathode catalyst for hollow nano water electrolysis, and a preparation method thereof. The method comprises the following steps: 1, adding potassium ferricyanide into a mixedsolution of a cobalt salt and sodium citrate according to the molar ratio of the cobalt salt to the potassium ferricyanide of (0.1-1): (0.2-0.5), then standing still, separating an obtained product, and sequentially washing and drying to obtain a prussian blue-like compound; and 2, carrying out annealing treatment on the prussian blue-like compound and NaH2PO2 under a protective gas according to amass ratio of (0.2-0.4): (1-2) to obtain the cathode catalyst for hollow nano-electrolysis of water. The method is uniform in reaction heating, simple and easy to operate and easy to control, the used raw materials are low in cost, the target product is easy to obtain, and the prepared catalyst is of a hollow structure and has excellent electrocatalytic activity and cathode reaction stability.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis, in particular to a hollow nanometer cathode catalyst for electrolyzing water and a preparation method thereof. Background technique [0002] The Prussian Blue Analogue (PBA) was discovered as early as 1704, and it is the oldest and simplest metal-organic framework compound. Due to its wide application in the fields of gas adsorption, energy storage, catalysis, and drug loading, it has received extensive attention and a lot of research. [0003] The Prussian blue-like compound is a supramolecular structure formed by the self-assembly connection of a transition metal central ion as a metal linker and a cyano group ligand as an organic linker. In the Prussian blue-like framework structure, transition metals have two different positions adjacent to carbon atoms and nitrogen atoms, and these two positions can be occupied by different metal ions. These metallic elements include transition me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J35/10B82Y30/00B82Y40/00C25B11/06C25B1/04
CPCB01J27/1853B01J35/0033B01J35/1004B82Y30/00B82Y40/00C25B11/04C25B1/04Y02E60/36
Inventor 冯永强董沛沛黄剑锋曹丽云王潇冯伟航陈俊生王海
Owner SHAANXI UNIV OF SCI & TECH
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