Preparation method of ruthenium@ruthenium dioxide core-shell nanospheres containing tensile strain for acidic oxygen production electrocatalyst

An electrocatalyst, tensile strain technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc., to achieve the effects of easy control, convenient operation, and increased intrinsic activity

Active Publication Date: 2020-04-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the fact that there is no way to adjust Ru without introducing heteroatoms 4+ The electronic structure of the active site and then the problem of modifying the ruthenium dioxide-based catalyst,

Method used

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  • Preparation method of ruthenium@ruthenium dioxide core-shell nanospheres containing tensile strain for acidic oxygen production electrocatalyst
  • Preparation method of ruthenium@ruthenium dioxide core-shell nanospheres containing tensile strain for acidic oxygen production electrocatalyst
  • Preparation method of ruthenium@ruthenium dioxide core-shell nanospheres containing tensile strain for acidic oxygen production electrocatalyst

Examples

Experimental program
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Effect test

Example Embodiment

[0026] Example 1:

[0027] (1) Place the commercial ruthenium dioxide powder in ultrapure water and ultrasonically disperse it to a suspension without precipitation at a concentration of 1.0 mg / mL;

[0028] (2) The suspension prepared in step (1) was continuously stirred at room temperature at a stirring speed of 400 rpm, and irradiated with nanosecond parallel pulse laser for 20 minutes, and the laser energy was 518mJ , Get a black solution;

[0029] (3) Put the black solution obtained in step (2) into a freezer at -4°C and freeze it into a solid, then place the frozen solid in a freeze dryer and freeze-dry it at -50°C and 50Pa to obtain a strain-containing Ruthenium@Ruthenium dioxide core-shell nanospheres.

[0030] The process device diagram for preparing strained ruthenium@ruthenium dioxide core-shell nanospheres by nanosecond laser irradiation figure 1 Shown, with RuO 2 The water dispersion container is placed on a magnetic stirrer and irradiated with pulsed laser parallel light...

Example Embodiment

[0034] Example 2:

[0035] (1) The commercial ruthenium dioxide powder is placed in ultrapure water and ultrasonically dispersed at a concentration of 0.5 mg / mL to a suspension without precipitation.

[0036] (2) The suspension prepared in step (1) was continuously stirred at room temperature at a stirring speed of 500 rpm, and irradiated with nanosecond parallel pulse laser for 60 minutes, and the laser energy was 185mJ , Get a black solution;

[0037] (3) Place the black solution obtained in step (2) in a refrigerator at -20°C and freeze it into a solid, and then place the frozen solid in a freeze dryer, and lyophilize at -10°C and 20Pa to obtain a strain-containing Ruthenium@Ruthenium dioxide core-shell nanospheres.

Example Embodiment

[0038] Example 3:

[0039] (1) The commercial ruthenium dioxide powder is placed in ultrapure water and ultrasonically dispersed at a concentration of 0.5 mg / mL to a suspension without precipitation.

[0040] (2) The suspension prepared in step (1) was continuously stirred at room temperature at a stirring speed of 300 rpm, and irradiated with nanosecond parallel pulse laser for 10 minutes, and the laser energy was 409mJ , Get a black solution;

[0041] (3) Put the black solution obtained in step (2) into a freezer at -10°C and freeze it into a solid, then place the frozen solid in a freeze dryer and lyophilize at -20°C and 40Pa to obtain a strain containing Ruthenium@Ruthenium dioxide core-shell nanospheres.

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Abstract

The invention relates to a preparation method of ruthenium@ruthenium dioxide core-shell nanospheres containing tensile strain for an acidic oxygen production electrocatalyst. Ruthenium dioxide powderis placed in ultrapure water to be subjected to ultrasonic dispersion to obtain turbid liquid without sediment; the turbid liquid is continuously stirred at room temperature, and the turbid liquid isirradiated by using nanosecond parallel pulse laser to obtain a black solution; the black solution is placed in a refrigerator to be frozen into a solid, then the frozen solid is placed in a freeze dryer to be freeze-dried, and the ruthenium@ruthenium dioxide core-shell nanospheres containing strain are obtained. According to the prepared sample, the overpotential at 10 mA cm <-2 > is only 191 mVand is reduced by 100 mV or above compared with commercial ruthenium dioxide, and the ruthenium@ruthenium dioxide core-shell nanospheres are a ruthenium-based catalyst which is optimal in performanceat present and does not introduce other atoms. The preparation method is simple in process, convenient to operate and easy to control, and a useful way is provided for designing and synthesizing an efficient electrocatalyst.

Description

technical field [0001] The invention belongs to the technical field of core-shell structure construction, and relates to the preparation of strained ruthenium@ruthenium dioxide core-shell nanospheres by irradiating commercial ruthenium dioxide powder with laser. The tensile strain in the ruthenium dioxide shell is used to generate Ru X+ (4<x<5) Increase the intrinsic activity and increase the conductivity of the ruthenium core to improve the electrocatalytic oxygen generation performance in acidic environment. In particular, a method for preparing acidic oxygen-generating electrocatalysts containing tensile strained ruthenium@ruthenium dioxide core-shell nanospheres is proposed. Background technique [0002] As a resource with huge reserves and recyclable utilization, water can be electrochemically decomposed into clean hydrogen energy and chemical oxygen by an electrolyzer to realize an environmentally friendly energy cycle. Compared with alkaline electrolyzers, prot...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J35/00B01J35/08B01J37/34C25B1/04C25B11/06
CPCB01J23/462B01J35/0033B01J35/08B01J37/349C25B1/04C25B11/093Y02E60/36
Inventor 杨静闻益智杜希文
Owner TIANJIN UNIV
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