Strontium-doped precious metal oxide oxygen evolution electrocatalyst and preparation method thereof

A precious metal oxide, electrocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to improve catalyst performance, reduce precious metal loading, equipment less demanding effects

Active Publication Date: 2019-04-05
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Strontium-doped precious metal oxide oxygen evolution electrocatalyst and preparation method thereof
  • Strontium-doped precious metal oxide oxygen evolution electrocatalyst and preparation method thereof
  • Strontium-doped precious metal oxide oxygen evolution electrocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

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, and particularly relates to a strontium-doped precious metal oxide oxygen evolution electrocatalyst and a preparation method thereof. Accordingto the changing condition of solubility of strontium hydroxide along with temperature, high-temperature strontium hydroxide solution reacts with metal chloric acid, an outer layer of precious metal hydroxide separates out strontium hydroxide precipitates by cooling, and the precipitates are calcined at high temperature to obtain the strontium-doped precious metal oxide oxygen evolution electrocatalyst. The method is simple and low in equipment requirement, and the prepared oxygen evolution electrocatalyst is good in stability and high in catalytic activity, and has more reactive sites.

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 Applications(China)
IPC IPC(8): B01J23/58C25B1/04C25B11/06
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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