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Efficient cobalt diselenide/cobalt tungstate composite electrocatalyst and preparation method thereof

A technology of cobalt diselenide and electrocatalyst, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low activity of a single cobalt tungstate catalyst, and improve the effective specific surface area, The effect of high yield and controllable reaction conditions

Active Publication Date: 2019-07-23
RES INST OF ZHEJIANG UNIV TAIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the invention is to solve the technical problem that the activity of a single cobalt tungstate catalyst is not high

Method used

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  • Efficient cobalt diselenide/cobalt tungstate composite electrocatalyst and preparation method thereof
  • Efficient cobalt diselenide/cobalt tungstate composite electrocatalyst and preparation method thereof
  • Efficient cobalt diselenide/cobalt tungstate composite electrocatalyst and preparation method thereof

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Experimental program
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Embodiment 1

[0026] In the present embodiment, the synthesis process of cobalt tungstate is as follows:

[0027] using hydrothermal method to synthesize cobalt tungstate, the specific steps are as follows. 1 mmol of cobalt chloride hexahydrate was dissolved in 20 mL of water to form a solution, which was designated as A; 1 mmol of sodium tungstate dihydrate was dissolved in 20 mL of water to form a transparent solution, which was designated as B. Add B to A to form a purple suspension, stir for 15 minutes to mix evenly, then transfer the purple suspension to a washed and dried autoclave polytetrafluoroethylene liner (V = 50 mL), and then add Continue to stir 0.5 mL of ammonia water for 15 min, then take out the magnet, screw the reactor tightly and seal it, and put it into an electric heating constant temperature blast drying oven at 180°C for 12 h. After the reaction was finished, it was naturally cooled to room temperature, and the product was taken out. Wash several times with high-p...

Embodiment 2

[0029] In this embodiment, cobalt tungstate is used as cobalt source, selenium powder is used as selenium source, solvent is N,N dimethylformamide, sodium hydroxide is alkali, reducing agent is hydrazine hydrate, cobalt diselenide / cobalt tungstate The synthesis process is as follows:

[0030] Add 40 mL of N,N dimethylformamide to the cleaned and dried polytetrafluoroethylene liner (V = 50 mL) of the autoclave, then weigh 7.5 mmol of sodium hydroxide and stir to dissolve, wait for the hydrogen After the sodium oxide is completely dissolved, add 3.75 mmol selenium powder and continue to stir and dissolve. After the selenium powder is dissolved, add 0.8 milliliters of hydrazine hydrate (mass fraction 85%) and continue to stir and mix evenly. Then add the cobalt tungstate synthesized in Example 1 above and continue to stir for 15 minutes. Take out the magnet. After the reaction kettle is screwed tightly and sealed, it is put into an electric heating constant temperature blast dry...

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Abstract

The invention discloses an efficient cobalt diselenide / cobalt tungstate composite electrocatalyst. The efficient cobalt diselenide / cobalt tungstate composite electrocatalyst comprises cobalt diselenide and cobalt tungstate. The invention also discloses a preparation method of the efficient cobalt diselenide / cobalt tungstate composite electrocatalyst. The efficient cobalt diselenide / cobalt tungstate composite electrocatalyst is synthesized through a two-step conversion method; the preparation method is mild in reaction condition, simple to operate, green in raw materials, low in cost, short inproduct preparation cycle and high in repeatability. The cobalt diselenide / cobalt tungstate composite electrocatalyst is synthesized by a two-step hydrothermal method at low temperature; the hydrothermal method has the advantages of low energy consumption, high yield, high product purity, controllable reaction conditions and wide applicability; the prepared cobalt diselenide / cobalt tungstate composite electrocatalyst is not easy to stack and agglomerate; the effective specific surface area is greatly increased; compared with single cobalt tungstate, the activity of the cobalt diselenide / cobalttungstate composite electrocatalyst is obviously improved.

Description

technical field [0001] The invention relates to a high-efficiency cobalt diselenide / cobalt tungstate composite electrocatalyst and a preparation method thereof. Background technique [0002] Electrocatalysis is a kind of catalysis that accelerates the reaction by transferring charges on the interface between electrodes and electrolytes. It is an interdisciplinary subject involving many scientific branches such as electrochemistry, surface science, and material science. In recent years, electrocatalysis has been widely used in the fields of analysis, biology, environmental protection, energy conversion and storage, etc. [0003] The electrolytic water reaction mainly includes two half-reactions of cathodic hydrogen evolution and anodic oxygen evolution. The efficiency of electrolytic water is determined by the 4-electron anodic oxygen evolution reaction. High-efficiency anodic oxygen evolution reaction catalysts can improve the catalytic efficiency of electrolytic water. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057B01J35/00
CPCB01J27/0573B01J35/33
Inventor 聂祝平黄然丁伟伟周伯昕
Owner RES INST OF ZHEJIANG UNIV TAIZHOU
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