Method for self-assembly carbon coating of transition metal oxide
A transition metal and oxide technology, applied in the field of oxygen evolution reaction catalysts, can solve the problems of unsolved stability problems, and achieve the effect of a simple modification method
Active Publication Date: 2019-10-29
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology
However, the stability of OER catalysts catalyzed by transition metal oxides has not been resolved.
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Embodiment 1
[0025] An embodiment of the present invention provides a method for self-assembled carbon coating of transition metal oxides, comprising the following steps:
[0026] (1)Co(OH) 2 Preparation of nanosheets: Weigh 1.5g cobalt acetate and dissolve it in 50mL distilled water, stir to dissolve cobalt acetate evenly; weigh 0.15g NaOH and dissolve it in 40ml distilled water, stir to dissolve evenly, take 20mL cobalt acetate solution with a syringe and inject slowly into the stirring NaOH solution, stirring and reacting for 30min; then place it in a reaction kettle at 100°C for 12h, then suction filter, wash and dry to collect Co(OH) 2 .
[0027] (2)Co 3 o 4 Synthesis of @C: 186mg Co(OH) 2 Nanosheets were ultrasonically dispersed in distilled water, then 12.9mg of cyanuric acid was added, stirred and reacted for 30min, then placed in a reaction kettle at 200°C for 6h, after which the precipitate was collected by suction filtration, washed and dried; then the collected precipitate ...
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The invention relates to a method for self-assembly carbon coating of transition metal oxide, and belongs to the field of oxygen evolution reaction catalysts. Specifically, with the method provided bythe invention, the acid and alkali characteristics of transition metal hydroxide are utilized, and acidic and alkaline organic micromolecules are alternately used as a carbon source, so self-assemblycarbon coating on the surface of the transition metal oxide is realized, and the problem of poor stability of a conventional transition metal oxide catalyst is solved. According to the invention, bycontrolling reaction conditions, carbon-coated precursors with different carbon layer numbers are formed on the surface of the transition metal oxide by controllable and uniform self-assembling, and through pyrolysis treatment, controllable carbon layer coating is realized, so catalytic activity and stability of a catalyst are simultaneously improved. The method provided by the invention is simpleand highly-efficient, has low cost, can effectively improve the problem of poor catalytic stability for a transition metal oxide OER catalyst, and has practical significance on promoting large-scaleapplication of water electrolysis.
Description
technical field [0001] The invention relates to the field of oxygen evolution reaction catalysts, in particular to a method for self-assembled carbon coating of transition metal oxides. Background technique [0002] The energy and environment crisis caused by the rapid development of modern society and economy makes the development of new clean energy framework an important prerequisite for sustainable economic development in the future. Hydrogen energy technology is one of the most promising clean energy technologies at present. By combining with other new energy methods, it can achieve efficient energy conversion, transmission, and sustainable utilization. As the most important part of hydrogen energy technology, hydrogen production by electrolysis of water can efficiently split water to produce hydrogen, which is a simple and clean way to produce hydrogen. However, large-scale commercial application of water electrolysis technology has not yet been achieved, mainly due t...
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Login to View More IPC IPC(8): B01J23/889B01J27/24C25B11/06C25B1/04
CPCB01J23/8892B01J27/24C25B11/04C25B1/04B01J35/33Y02E60/36
Inventor 蔡卫卫邹娟刘朝周顺发张文杰吴君丽李静
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)