IrO2 catalyst used for water electrolysis, and preparation method thereof
A catalyst, water electrolysis technology, applied in the field of electrochemistry, can solve problems such as small specific surface area and particle agglomeration
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[0027] The present invention first provides a kind of IrO for water electrolysis 2 The preparation method of catalyst comprises the following steps:
[0028] a) dissolving sodium hydroxide in deionized water, then adding chloroiridic acid to obtain the first solution;
[0029] b) reacting the first solution in an oil bath, and stirring and cooling to room temperature after the reaction to obtain a second solution;
[0030] C) in the second solution, add acid, adjust pH, centrifuge, dry, obtain the hydroxide of iridium;
[0031] D) the hydroxide of above-mentioned iridium is calcined in air atmosphere, obtains the IrO that is used for water electrolysis 2 catalyst.
[0032] According to the present invention, sodium hydroxide is first dissolved in deionized water, and then hydrated chloroiridic acid is added to obtain a first solution. Adding chloroiridic acid back into the sodium hydroxide lye can provide more nucleation sites, so that the particles can be dispersed evenly...
Embodiment 1
[0039]Dissolve 1.2 g of sodium hydroxide in deionized water, then add 1.5 mmol of chloroiridic acid to obtain a first solution; react the first solution in an oil bath at 80° C. for 60 min, and stir and cool to room temperature after the reaction to obtain a second solution; The pH of the second solution was adjusted to 8 with 1 mol / L nitric acid, and the solution was filtered and washed with deionized water with a resistivity of 18.2 MΩ·cm until no Cl ions existed, and the obtained material was vacuum-dried at 60° C., The iridium hydroxide is obtained; the iridium hydroxide is heat-treated in a tube furnace at 400° C. in an air atmosphere for 1 h to obtain the IrO 2 catalyst.
[0040] the IrO 2 The catalyst was ultrasonically dispersed in ethanol to obtain a suspension; the suspension was coated on a copper mesh and dried, and then scanned by an electron microscope. The results are shown in figure 1 , figure 1 IrO prepared for Example 1 2 The transmission electron microsc...
Embodiment 2
[0043] Dissolve 0.4 g of sodium hydroxide in deionized water, then add 1.0 mmol of chloroiridic acid to obtain a first solution; react the first solution in an oil bath at 60°C for 40 min, and stir and cool to room temperature after the reaction to obtain a second solution; Adjust the pH of the second solution to 8 with 0.5 mol / L nitric acid, filter the solution with deionized water with a resistivity of 18.2 MΩ·cm until no Cl ions exist, and vacuum dry the obtained material at 60 ° C. , to obtain the hydroxide of the iridium; heat the hydroxide of the iridium in a tube furnace at 300° C. in an air atmosphere for 30 min to obtain the IrO 2 catalyst.
[0044] the IrO 2 The catalyst was ultrasonically dispersed in ethanol to obtain a suspension; the suspension was coated on a copper mesh and dried, and then scanned by an electron microscope. The results are shown in image 3 , image 3 IrO prepared for Example 2 2 The transmission electron microscope photo of the catalyst un...
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Abstract
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