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

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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, by adjusting the laser irradiation energy and time, synthesized ruthenium@ruthenium dioxide core-shell nanospheres with strain stability, using the ruthenium dioxide in the shell Tensile strain creates Ru X+ (4

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

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Experimental program
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Embodiment 1

[0027] (1) Place 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) With the suspension prepared in step (1), keep stirring at room temperature, the stirring speed is 400 rpm, irradiate with nanosecond parallel pulse laser, and irradiate with nanosecond parallel pulse laser for 20min, and the energy of the laser is 518mJ , to obtain a black solution;

[0029] (3) Place the black solution obtained in step (2) in a refrigerator and freeze it into a solid at -4°C, then place the frozen solid in a lyophilizer, and freeze-dry it at -50°C and 50Pa to obtain strain-containing Ru@RuO2 core-shell nanospheres.

[0030] Schematic diagram of the process device for preparing strained ruthenium@ruthenium dioxide core-shell nanospheres by nanosecond laser irradiation figure 1 shown, loaded with RuO 2 The container of the aqueous dispersion is placed on a magnetic stirrer ...

Embodiment 2

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

[0036] (2) With the suspension prepared in step (1), keep stirring at room temperature, the stirring speed is 500 rpm, irradiate with nanosecond parallel pulse laser, and irradiate with nanosecond parallel pulse laser for 60min, and the energy of the laser is 185mJ , to obtain a black solution;

[0037] (3) Place the black solution obtained in step (2) in a refrigerator to freeze to a solid at -20°C, then place the frozen solid in a lyophilizer, and freeze-dry at -10°C and 20Pa to obtain strain-containing Ru@RuO2 core-shell nanospheres.

Embodiment 3

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

[0040] (2) With the suspension prepared in step (1), keep stirring at room temperature, the stirring speed is 300 rpm, irradiate with nanosecond parallel pulse laser, irradiate with nanosecond parallel pulse laser for 10min, and the energy of the laser is 409mJ , to obtain a black solution;

[0041] (3) Place the black solution obtained in step (2) in a refrigerator to freeze to a solid at -10°C, then place the frozen solid in a freeze dryer, and freeze-dry at -20°C and 40Pa to obtain strain-containing Ru@RuO2 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
CPCB01J23/462B01J37/349C25B1/04C25B11/093B01J35/33B01J35/51Y02E60/36
Inventor 杨静闻益智杜希文
Owner TIANJIN UNIV
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