Oxygen electrode slurry for solid oxide electrolytic cell and preparation method thereof, solid oxide electrolytic cell
A solid oxide, electrolytic cell technology, applied in electrodes, electrolysis components, electrolysis process, etc., can solve the problems such as the inability to effectively reduce the initial internal resistance of SOEC, the rapid growth of oxygen electrode impedance, and the reduction of LSCF, and achieve high initial electrolysis efficiency. The effect of increasing the number of three-phase boundaries and improving the mixed conductivity
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[0062] 3) Preparation of electrolyte layer: YSZ powder and organic binder are mixed according to the mass ratio of (1~2):1, then ball milled for 1~3h and evenly mixed, and applied to the surface of the hydrogen electrode functional layer with a thickness of 5~ 30μm, fully dried in air; YSZ powder particle size is 60-100nm;
[0063] 4) Sintering of electrolyte and hydrogen electrode part: sinter the hydrogen electrode support body-hydrogen electrode functional layer-electrolyte layer prepared in the above steps at 1200-1600 ℃ for 2-5 hours; after the hydrogen electrode support body is sintered and reduced at high temperature The porosity is 25% to 55%, and the porosity of the hydrogen electrode functional layer after high temperature sintering and reduction is 20% to 50%;
[0064] 5) Preparation of SOEC oxygen electrode: using the oxygen electrode material powder as the carrier, the metal oxide nanoparticles are supported on the oxygen electrode material powder, so that the met...
Embodiment 1
[0072] The first solid oxide electrolytic cell is prepared in the embodiment of the present application, and the preparation method is as follows:
[0073]1) First prepare the SOEC hydrogen electrode support containing NiO and YSZ: mix the NiO and YSZ powders with graphite pore-forming agent at a ratio of 1:1:0.2 by ball milling for 10 hours, take the mixed powders and put them into the mold, warm and press Shaped to obtain a square sheet-like support with a side length of 7 cm and a thickness of 300 μm, and then pre-sintered at 1200 ° C for 2 h to obtain a hydrogen electrode support, which was used as the support of the entire battery;
[0074] 2) Preparation of hydrogen electrode functional layer: NiO and YSZ powders were uniformly mixed in a ratio of 1:1, dispersed uniformly in isopropanol by ultrasonic waves, sprayed on the surface of the support with a thickness of 8 μm, and fully dried in an air atmosphere of 150 °C. dry to obtain a hydrogen electrode functional layer; ...
Embodiment 2
[0096] The examples of this application are the electrochemical performance test and scanning electron microscope test of sample 1, sample 2, sample 3 and sample 4:
[0097]
[0098] 1. Measure the internal resistance of sample 1, sample 2 and sample 3, the results are as follows figure 1 shown. figure 1 The results of electrochemical AC impedance spectroscopy of sample 1, sample 2 and sample 3 provided in the examples of this application. The internal resistance of several samples was tested by electrochemical impedance spectroscopy (EIS), and the test conditions were 750°C, H 2 Humidification 66.6%, open circuit condition. like figure 1 As shown, the impedance spectrum is mainly composed of two semicircles. The intersection of the left side of the semicircle and the real axis corresponds to the ohmic resistance of the electrolytic cell, the diameter of the semicircle in the high frequency region on the left corresponds to the activation polarization impedance of the el...
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