A bifunctional catalyst and its preparation and application in metal-air batteries
A bifunctional catalyst and cobalt oxide technology, which is applied in battery electrodes, fuel cell half-cells, primary battery half-cells, circuits, etc., can solve the problems of cumbersome catalyst preparation process and need to be improved, and achieve excellent electrochemical performance. Performance and charge and discharge performance, superior electrochemical performance and repeatability, and the effect of easy access to raw materials
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Embodiment 1
[0036] A dual-function catalyst including carbon nanotubes, cobalt oxide and manganese dioxide. The manganese dioxide is tubular, with a length of 1-3 μm and an inner diameter of 7-10 nm; cobalt oxide is nano particles with a diameter of 10-20 nm; carbon nanotubes, cobalt oxide and manganese dioxide are compounded together.
[0037] The preparation method of the bifunctional catalyst of the present invention is:
[0038] (1) Configure a homogeneous mixed aqueous solution with a mass ratio of potassium permanganate and water of 1.2:100. At room temperature, the ratio of potassium permanganate solution and concentrated hydrochloric acid (concentration of 37.5%, the same below) is 101.2g:4ml Slowly add concentrated hydrochloric acid to the stirring potassium permanganate solution, stir until the mixture is uniform, pour the homogeneous solution into the autoclave and react hydrothermally at 140°C for 12 hours, cool to room temperature, and rinse with ethanol and deionized water for 3 ...
Embodiment 2
[0046] Dissolve 5 mg of the catalyst powder prepared in Example 1 in 1 ml of ethanol and 8 μl of 5% nafion solution, sonicate for 30 minutes to form a homogeneous catalyst slurry, and then drip it onto the disk electrode to obtain a catalyst loading of 50 μg, and then air dry dry. An electrochemical workstation was used to determine the polarization curve of the catalyst. Oxygen was introduced into 0.1mol / L potassium hydroxide solution for 30 minutes, and then the disk electrode coated with catalyst was used as the working electrode. The calomel electrode and the Pt electrode were the reference electrode and the counter electrode, respectively. CNTs and Co3O4 / Polarization curves of MnO2 / CNTs and Co3O4 / MnO2.
[0047] The experimental results are as figure 2 As shown, the results show that the bifunctional performance of the catalyst is obvious, the onset potential of ORR is 1.04V, and the onset potential of OER is 1.45V. At 0.2V, Co3O4 / MnO2 / CNTs, 20% Pt / C, CNTs; current densit...
Embodiment 3
[0049] Dissolve 5 mg of the catalyst powder prepared in Example 1 in 1 ml of ethanol and 8 μl of 5% nafion solution, sonicate for 30 minutes to form a uniform catalyst slurry, and then drip it onto the disk electrode to make the catalyst loadings 50, 100, 150, respectively , 200, 250μg, and then air dry naturally. An electrochemical workstation was used to determine the polarization curve of the catalyst. Oxygen was introduced into the 0.1mol / L potassium hydroxide solution for 30 minutes, and then the disk electrode coated with the catalyst was used as the working electrode. The saturated mercury electrode and the Pt electrode were the reference electrode and the counter electrode, respectively. Polarization curve of three-way catalyst.
[0050] The experimental results are as image 3 As shown, the results show that the dual-function performance of the catalyst is obvious. The onset potential of ORR is almost 1.04V under different loadings, and the onset potential of OER is 1.4...
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