A kind of lanthanide metal-doped lanthanum cobaltate nanotube material and its preparation method, and the method of electrolyzing water to produce hydrogen
A technology of lanthanide metals and lanthanum cobaltate, which is applied in the field of nanomaterials, can solve the problems of high price and limited wide application, and achieve the effect of optimizing strength, high specific surface area and improving catalytic activity
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[0069] The present invention also provides a method for preparing the lanthanide metal-doped lanthanum cobaltate nanotube material described in the above technical solution, comprising the following steps:
[0070] a) mixing tellurium nanowires, a carbon source compound and water, and performing heat treatment to obtain a carbon nanofiber dispersion;
[0071] b) after mixing the carbon nanofiber dispersion with lanthanum salt, cobalt salt, doping element metal salt and urea, perform a hydrothermal reaction to obtain metal precursor-coated carbon nanofibers;
[0072] c) heat-treating the carbon nanofiber coated with the metal precursor to obtain a lanthanide metal doped lanthanum cobaltate nanotube material; the lanthanide metal doped lanthanum cobaltate has a structure shown in formula (I):
[0073] (La 1-x A x )CoO 3 (I);
[0074] in,
[0075] Lanthanide metal doping element A is one or more of Ce, Pr, Nd, Sm and Gd;
[0076] 0
[0077] Regarding step a): mixin...
Embodiment 1
[0112] S1, preparation of carbon nanofibers:
[0113] Add 1g of sodium tellurite and 12g of polyvinylpyrrolidone into 350mL of water, stir evenly, then add 18mL of hydrazine hydrate and 36mL of ammonia water, stir evenly, transfer to a 500mL polytetrafluoroethylene reactor, and put it in an oven at 180°C After reacting for 3 hours, a dispersion liquid of tellurium nanowires was obtained. Take 5 mL of the tellurium nanowire dispersion liquid and add it into 20 mL of acetone to form a tellurium nanowire precipitate, which is centrifuged to obtain the tellurium nanowire.
[0114] Disperse 0.056mmol tellurium nanowires into 35mL water, add 2.5g glucose (the molar ratio of tellurium nanowires:glucose is 1:248), transfer to a 50mL polytetrafluoroethylene reactor, and put it in an oven at 180°C for 8h , to obtain a carbon nanofiber dispersion.
[0115] S2. Preparation of metal precursor-coated carbon nanofibers:
[0116] Add 0.6mmol of lanthanum nitrate, 1mmol of cobalt nitrate, a...
Embodiment 2
[0121] S1. Preparation of carbon nanofibers: same as in Example 1.
[0122] S2. Preparation of metal precursor-coated carbon nanofibers:
[0123] Carried out as in Example 1, except that 0.6 mmol of lanthanum nitrate was replaced with 0.48 mmol of lanthanum nitrate and 0.12 mmol of cerium nitrate.
[0124] S3, the preparation of nanotube material: with embodiment 1, the result obtains Ce-doped LaCoO 3 type perovskite nanotube material, namely (La 1-x Ce x )CoO 3 , x=0.2.
[0125] Obtained product is carried out transmission electron microscope observation, the result is as follows figure 2 as shown, figure 2 For the Ce-doped LaCoO obtained in Example 2 3 TEM images of perovskite nanotube materials. It can be seen that with figure 1 LaCoO in 3 type perovskite nanotube material compared to the Ce-doped LaCoO obtained in Example 2 3 The morphology of the type perovskite nanotube material has not changed significantly, and still exhibits a tubular structure, which pro...
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