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A kind of strontium-doped noble metal oxide oxygen evolution electrocatalyst and preparation method thereof

A technology of noble metal oxides and electrocatalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to improve catalyst performance, simple preparation method, reduce precious metal load load effect

Active Publication Date: 2021-05-28
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that there is no strontium-doped noble metal oxide to prepare an oxygen evolution catalyst, thereby providing a kind of strontium-doped noble metal oxide with simple preparation method, low cost and good catalyst activity Oxygen evolution electrocatalyst and preparation method thereof

Method used

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  • A kind of strontium-doped noble metal oxide oxygen evolution electrocatalyst and preparation method thereof
  • A kind of strontium-doped noble metal oxide oxygen evolution electrocatalyst and preparation method thereof
  • A kind of strontium-doped noble metal oxide oxygen evolution electrocatalyst and preparation method thereof

Examples

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Embodiment 1

[0036] Preparation of Strontium-doped Iridium Oxide Oxygen Evolution Electrocatalyst

[0037] Prepare 20mL of 0.1mol / L chloroiridic acid; prepare 21.85mL of 0.6mol / L strontium hydroxide solution at 80°C; mix the two, cool down to 20°C, centrifuge at 10000rpm, take the precipitate, and calcinate the precipitate at 550°C for 2h , to get 0.55g, SrO, IrO 2 Strontium-doped iridium oxide oxygen evolution electrocatalyst with a molar ratio of 1:2.

[0038] Prepare a loading capacity of 2.5mg / cm 2 The oxygen evolution electrode has been tested and the current density is 10mA / cm 2 , the overpotential of the catalyst is 0.28V, and at a current density of 100mA / cm 2 , the overpotential of the catalyst is 0.66V; at 100mA / cm 2 Under the test condition of current density, after 2.5 hours of stability test, the current density decays to 5%. figure 1 It is a schematic structural diagram of the oxygen evolution electrocatalyst prepared in Examples 1-8, the core body is a noble metal oxide...

Embodiment 2

[0040] Preparation of Strontium-doped Iridium Oxide Oxygen Evolution Electrocatalyst

[0041]Prepare 20mL of 0.1mol / L chloroiridic acid; prepare 28.45mL of 0.6mol / L strontium hydroxide solution at 80°C; mix the two, cool down to 20°C, centrifuge at 10000rpm, take the precipitate, and calcinate the precipitate at 550°C for 2h , to get 0.86g, SrO, IrO 2 Strontium-doped iridium oxide oxygen evolution electrocatalyst with a molar ratio of 2:1.

[0042] Prepare a loading capacity of 2.5mg / cm 2 The oxygen evolution electrode has been tested and the current density is 10mA / cm 2 , the overpotential of the catalyst is 0.33V, and at a current density of 100mA / cm 2 , the overpotential of the catalyst is 0.74V; at 100mA / cm 2 Under the test condition of current density, after 2.5 hours of stability test, the current density decays to 5.5%.

Embodiment 3

[0044] Preparation of Strontium-doped Iridium Oxide Oxygen Evolution Electrocatalyst

[0045] Prepare 20 mL of 0.02 mol / L chloroiridic acid; prepare 8 mL of 0.15 mol / L strontium hydroxide solution at 90 °C; mix the two, cool down to 30 °C, centrifuge at 10000 rpm, take the precipitate, and calcinate the precipitate at 400 °C for 4 hours. The strontium-doped iridium oxide oxygen evolution electrocatalyst was obtained.

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Abstract

The invention belongs to the field of electrocatalysts, in particular to a strontium-doped noble metal oxide oxygen evolution electrocatalyst and a preparation method thereof. The invention utilizes the change of the solubility of strontium hydroxide with temperature, reacts the high-temperature strontium hydroxide solution with metal chloric acid, and then cools down the outer layer of the noble metal hydroxide to precipitate strontium hydroxide, and calcines the precipitate at high temperature to obtain strontium-doped The oxygen evolution electrocatalyst of miscellaneous noble metal oxides; the method of the invention is simple, has low equipment requirements, and the obtained oxygen evolution electrocatalyst has good stability, many reaction sites and high catalytic activity.

Description

technical field [0001] The invention belongs to the field of electrocatalysts, in particular to a strontium-doped noble metal oxide oxygen evolution electrocatalyst and a preparation method thereof. Background technique [0002] Energy conversion technology plays an important role in the consumption and storage of renewable energy. Among them, Solid polymer water electrolysis (SPE) technology has many advantages such as high efficiency, small size, fast start and stop, and long life. Accepted and initially commercialized at home and abroad. [0003] However, because the solid polymer water electrolysis technology needs to use noble metals as its catalyst, the cost of the stack is higher than that of the currently popular lye electrolysis, which limits its application scale. On the side of hydrogen evolution, carbon-supported platinum catalysts can be used at present to achieve relatively good performance at a lower loading of noble metals. The hydrogen evolution reaction a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/58C25B1/04C25B11/093
CPCB01J23/58B01J35/0033C25B1/04C25B11/04Y02E60/36
Inventor 田博元刘少名宋洁许可梁丹曦李璐杨岑玉徐桂芝邓占锋
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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