A method for self-assembled carbon coating of transition metal oxides
A technology of transition metals and oxides, which is applied in the field of oxygen evolution reaction catalysts, can solve problems such as stability problems that have not been solved, and achieve the effect of simple modification methods
Active Publication Date: 2020-11-24
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-assembling carbon coating of transition metal oxides, and belongs to the field of oxygen evolution reaction catalysts. This method specifically utilizes the acid-base properties of transition metal hydroxides and alternately uses acidic and alkaline organic small molecules as carbon sources to achieve self-assembled carbon coating on the surface of transition metal oxides, solving the problems faced by existing transition metal oxides. The problem of poor catalyst stability. By controlling the reaction conditions, the present invention can controllable and uniform self-assembly on the surface of transition metal oxide to form coated carbon precursors with different numbers of carbon layers, and then perform pyrolysis treatment to achieve controllable carbon layer coating, so that the catalytic activity and stability of the catalyst can be achieved at the same time. promote. The method of the invention is simple, efficient and low-cost, can effectively improve the problem of poor catalytic stability of the transition metal oxide OER catalyst, and has practical significance in promoting the large-scale application of electrolyzed water.
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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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)