Preparation method for CLSTON type visible photocatalytic overall water splitting catalyst
A catalyst and visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, oxygen preparation, etc., can solve the problems of low efficiency of water splitting by visible light and insufficient use of solar energy, and achieve high efficiency of total water splitting, Promotes the separation of photogenerated electrons and holes and improves efficiency
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Embodiment 1
[0045] Put calcium chloride, lanthanum chloride, scandium chloride, tantalum pentachloride and urea in a molar ratio of 1:1:1:1:100, accurately weigh them and put them into methanol aqueous solution (volume ratio of alcohol to water is 1:1) Stir to dissolve. Put the above mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the programmed temperature rise is 10 ℃ / min, the high temperature setting temperature is 600 ℃, and the holding time of the high temperature stage is 12 h. After natural cooling, the obtained Precursor. The precursor was nitrided in an ammonia atmosphere, the nitriding temperature was 800°C, and the time was 24 hours. After cooling, CLSTON powder was obtained. The purity of its products is not less than 99.73%, and the impurity content: carbon is less than 0.06%; chlorine is less than 0.13%. With CLSTON as the main catalyst, after stirring for 24 hours under 300 W xenon light (stirring speed 1000 rpm), the cocatalys...
Embodiment 2
[0047] Calcium nitrate, lanthanum nitrate, scandium nitrate, tantalum pentaethoxide and citric acid in a molar ratio of 1:1:1:1:50, accurately weighed and put into methanol aqueous solution (volume ratio of alcohol to water: 1:1) Stir to dissolve. Put the above mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the programmed temperature rise is 10 ℃ / min, the high temperature setting temperature is 800 ℃, the holding time of the high temperature stage is 6 h, and after natural cooling, the obtained Precursor. The precursor was nitrided in an ammonia atmosphere, the nitriding temperature was 850°C, and the time was 8 hours. After cooling, CLSTON powder was obtained. The purity of its products is not less than 99.93%, and the impurity content: carbon is less than 0.04%; chlorine is less than 0.02%. With CLSTON as the main catalyst, after stirring for 24 hours under 300 W xenon light (stirring speed 1000 rpm), the cocatalyst RhCrO x mi...
Embodiment 3
[0049] Calcium nitrate, lanthanum nitrate, scandium nitrate, tantalum pentaethoxide and citric acid in a molar ratio of 1:1:1:1:50, accurately weighed and put into methanol aqueous solution (volume ratio of alcohol to water: 1:1) Stir to dissolve. Put the above mixture into a large crucible and put it directly into a muffle furnace. The heating rate of the programmed temperature rise is 10 ℃ / min, the high temperature setting temperature is 900 ℃, and the holding time of the high temperature stage is 4 h. After natural cooling, the obtained Precursor. The precursor was nitrided in an ammonia atmosphere, the nitriding temperature was 900°C, and the time was 6 hours. After cooling, CLSTON powder was obtained. The purity of its products is not less than 99.87%, and the impurity content: carbon is less than 0.06%; chlorine is less than 0.03%. With CLSTON as the main catalyst, after stirring for 24 hours under 300 W xenon light (stirring speed 1000 rpm), the cocatalyst RhCrO x mi...
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