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Method for in-situ construction of defect active site in transition metal oxide catalyst

A transition metal, active site technology, applied in the field of electrocatalytic oxygen evolution, can solve problems such as complex processes

Active Publication Date: 2019-10-29
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalytic activity and stability of OER transition metal oxide catalysts can be improved by doping with heteroatoms such as sulfur, phosphorus, selenium, and boron, but these modification methods have problems such as complicated processes.

Method used

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  • Method for in-situ construction of defect active site in transition metal oxide catalyst

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specific Embodiment

[0027] A specific embodiment of the present invention comprises the following experimental steps:

[0028] (1) Preparation of sulfur-containing manganese / cobalt mixed oxide precursor: 0.264mmol MnSO 4 ·H 2 O and 0.258mmol of Co(NO 3 ) 2 ·6H 2 O was dissolved in 40 mL of DMF and 40 mL of acetone, and 0.8 mmol of 5-sulfonic isophthalic acid (5-SSIPA) was added for mixing and stirring.

[0029] Then it was placed in an autoclave and reacted at 160° C. for 4 hours; after that, it was kept in a high-speed centrifuge at a speed of 8000 r / min for 5 minutes to obtain a sulfur-containing manganese / cobalt mixed oxide precursor.

[0030] (2) Synthesis of sulfur-containing modified manganese / cobalt mixed oxide particles: the sulfur-containing manganese / cobalt mixed oxide precursor in step (1) was placed in a muffle furnace, and the temperature was raised to 500°C at 5°C / min. and keep it for 10 minutes; then cool to room temperature to obtain sulfur-containing modified manganese / cobal...

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Abstract

The invention relates to a method for rapid in-situ construction of a defect active site in a transition metal oxide catalyst, belonging to the field of electrocatalytic oxygen evolution in the process of water electrolysis. The method provided by the invention solves the problems of complicated process, high cost, poor stability and the like in a conventional modifying method. The method providedby the invention comprises the following steps: S1, preparation of a sulfur-containing transition metal oxide precursor; and S2, synthesis of a sulfur-containing modified transition metal oxide catalyst. The transition metal oxide catalyst rich in defect active sites and prepared by using the method provided by the invention has the advantages of high activity and good stability; the method is simple, convenient and easily-controllable and has low cost; and the catalyst can be extensively applied to the fields of water electrolysis, electrochemical catalysis and the like.

Description

technical field [0001] The invention relates to the field of electrocatalytic oxygen evolution in the process of electrolyzing water, in particular to a method for in-situ construction of defective active sites of transition metal oxide catalysts. Background technique [0002] Limited fossil fuels and the associated environmental pollution have become an urgent problem hindering the development of human society. Scientists around the world are working hard to explore alternative clean energy technologies. Hydrogen has attracted more and more attention due to its high efficiency, cleanliness and sustainability, among which electrolysis of water is a simple and clean way to produce hydrogen. However, the slow kinetics of the oxygen evolution reaction (OER) in water electrolysis has become a bottleneck for the large-scale commercial application of hydrogen electrolysis. Currently, the most active OER catalysts are noble metal oxides such as IrO 2 and Ru0 2 . Searching for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/00B01J27/02C25B1/04C25B11/06B01J23/889B01J37/04B01J37/08B01J37/20
CPCB01J27/02B01J23/002B01J23/8892C25B1/04C25B11/04B01J37/04B01J37/084B01J37/086B01J37/20B01J35/33Y02E60/36
Inventor 蔡卫卫贾晓萌梁家玮刘朝熊洁李静
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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