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Iridic oxide/manganese dioxide combined electrode with hierarchical structure and preparation method thereof

A composite electrode and hierarchical structure technology, which is applied to fuel cell type half cells and primary cell type half cells, battery electrodes, structural parts, etc., to achieve the effect of reducing overpotential and improving catalytic performance

Inactive Publication Date: 2017-10-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report of this type of composite catalyst that meets the above conditions.

Method used

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  • Iridic oxide/manganese dioxide combined electrode with hierarchical structure and preparation method thereof
  • Iridic oxide/manganese dioxide combined electrode with hierarchical structure and preparation method thereof
  • Iridic oxide/manganese dioxide combined electrode with hierarchical structure and preparation method thereof

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Effect test

Embodiment 1

[0050] After the commercial carbon cloth was hydrothermally reacted in 69wt% concentrated nitric acid at 90°C for 2 hours, it was first washed with deionized water, then ultrasonically cleaned with acetone, alcohol, and deionized water for 15 minutes, and then heated in air at 60°C. Dry for 8h; KMnO 4 Dissolve in deionized water and stir well to obtain K + A solution with a concentration of 0.0005mol / L, the above-mentioned pretreated commercial carbon cloth was immersed in the solution for 2 hours, and then hydrothermally reacted at 85°C for 2.5h, then washed with deionized water, and dried at 60°C in the air for 8 hours to obtain commercial Manganese-containing precursor supported on carbon cloth; KMnO 4 and IrCl 3 Dissolve in deionized water and stir evenly to obtain K + and Ir 3+ The concentrations were 0.001 mol / L and 0.00025 mol / L mixed solution respectively. The above-mentioned dried commercial carbon cloth loaded with manganese precursor was immersed in the mixed so...

Embodiment 2

[0071] After the commercial carbon felt was hydrothermally reacted in 69wt% concentrated nitric acid at 90°C for 2 hours, it was first washed with deionized water, then ultrasonically cleaned with acetone, alcohol, and deionized water for 15 minutes, and then heated in air at 60°C. Dry for 8h; KMnO 4 Dissolve in deionized water and stir well to obtain K + A solution with a concentration of 0.0003 mol / L, soak the pretreated carbon felt in the solution for 2 hours, and then conduct a hydrothermal reaction at 70°C for 1 hour, then wash with deionized water, and dry at 60°C in the air for 8 hours to obtain a carbon felt load. The manganese-containing precursor; the KMnO 4 and IrCl 3 Dissolve in deionized water and stir evenly to obtain K + and Ir 3+ The concentration is 0.0008mol / L and 0.0003mol / L mixed solution respectively, the above-mentioned dried carbon felt loaded with manganese precursor is immersed in the mixed solution for 2h, then hydrothermally reacted at 70℃ for 2h...

Embodiment 3

[0075] After the commercial carbon cloth was hydrothermally reacted in 69wt% concentrated nitric acid at 90°C for 2 hours, it was first washed with deionized water, then ultrasonically cleaned with acetone, alcohol, and deionized water for 15 minutes, and then heated in air at 60°C. Dry for 8h; KMnO 4 Dissolve in deionized water and stir well to obtain K + A solution with a concentration of 0.001mol / L, the above pretreated commercial carbon cloth was immersed in the solution for 2 hours, then hydrothermally reacted at 90°C for 3h, then washed with deionized water, and dried at 60°C in the air for 8h to obtain commercial carbon cloth Fabric-loaded manganese-containing precursor; the KMnO 4 and IrCl 3 Dissolve in deionized water and stir evenly to obtain K + and Ir 3+ The concentrations were 0.0015 mol / L and 0.0002 mol / L mixed solution respectively, the above-mentioned dried commercial carbon cloth loaded with manganese precursor was immersed in the mixed solution for 2 h, t...

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Abstract

The invention discloses an iridic oxide / manganese dioxide combined electrode with a hierarchical structure and a preparation method thereof. The electrode comprises flake-shaped MnQ2 directly growing on a substrate and nano IrO2 particles, wherein strip-shaped MnO2 covers the surface of the flake-shaped MnO2, and the nano IrO2 particles are uniformly placed on the surfaces of the flake-shaped MnO2 and the strip-shaped MnO2. In the iridic oxide / manganese dioxide combined electrode prepared by the method provided by the invention, the MnO2 and the IrO2 have a synergistic catalytic action, and improvement of catalytic performance is facilitated, so that overpotential of a lithium-air battery can be effectively reduced; the MnO2 in the combined electrode has a hierarchical structure, and comprises two forms, so that the combined electrode has larger specific surface area, and can provide more catalytic sites, improvement of deposition of Li2O2 is further facilitated, and thus battery capacity is improved.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium-air batteries, in particular to a kind of IrO with hierarchical structure 2 / MnO 2 Composite electrode and its preparation method. Background technique [0002] Lithium-air battery is a new type of energy storage device that uses metallic lithium as the negative electrode, air (or oxygen) as the positive electrode, and a lithium ion conductor as the electrolyte. The theoretical energy density of lithium-air batteries is as high as about 3500Wh / kg. Considering the weight of catalysts, electrolytes, battery packaging, etc., the actual available energy density of lithium-air batteries is still over 1000Wh / kg, which is much higher than that of nickel-hydrogen (50Wh / kg), lithium-ion (160Wh / kg), lithium-ion Energy densities of sulfur (370Wh / kg), zinc-air (350Wh / kg) batteries. [0003] Due to its high energy density, lithium-air batteries have important application pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M12/06B82Y30/00
CPCH01M4/9016B82Y30/00H01M4/8657H01M4/8842H01M4/9083H01M12/06
Inventor 赵新兵唐聪毛阳俊谢健曹高劭
Owner ZHEJIANG UNIV
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