Preparation method of Ag/alpha-Co(OH)2 oxygen evolution catalyst

A catalyst and oxygen evolution technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of high manufacturing cost, limitation of large-scale production and application, Poor stability and other problems, to achieve the effect of convenient operation, improved catalyst performance and low cost

Active Publication Date: 2021-07-20
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the scarcity, poor stability and high manufacturing cost of precious metals greatly limit their large-scale production and application.

Method used

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  • Preparation method of Ag/alpha-Co(OH)2 oxygen evolution catalyst
  • Preparation method of Ag/alpha-Co(OH)2 oxygen evolution catalyst
  • Preparation method of Ag/alpha-Co(OH)2 oxygen evolution catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1)α-Co(OH) 2 Synthesis of Nanosheets

[0028] In a typical procedure, CoCl 2 ·6H 2 O, NaCl and hexamethylenetetramine (HMT) were sequentially dissolved in 200 mL of deionized water and ethanol at a volume ratio of 9:1 to obtain final concentrations of 10, 50 and 60 mM, respectively. Then the reaction solution was stirred and heated to 90° C. in an oil bath. After heating for about 1 h, a suspension containing green particles resulted. The solid product was collected by centrifugation at 7000 rpm for 2 min, and washed several times with deionized water and absolute ethanol. The final product was air dried at room temperature.

[0029] (2) Ag / α-Co(OH) 2 Synthesis of Nanocomposites

[0030] 50 mg of the above-prepared α-Co(OH) 2 The sample was dispersed in deionized water (40 mL) and ultrasonically dispersed for 5 min. Aqueous silver nitrate (79.5 μL, 10 mg mL -1 ) was configured into 1mL of Ag(NH 3 ) 2 OH solution, and then prepared 1mL of Ag(NH 3 ) 2 OH so...

Embodiment 2

[0039] Ag / α-Co(OH) with different Ag loading content 2 The preparation method of catalyst is substantially the same as that of Example 1, except that silver nitrate aqueous solution (238.5 μ L, 10 mg mL -1 ) was configured into 1 mL of Ag(NH 3 ) 2 OH solution, and the rest of the steps are the same; further characterization analysis and performance testing have been carried out to it, and embodiment 2 can achieve the purpose of the invention.

Embodiment 3

[0041] Ag / α-Co(OH) with different Ag loading content 2 The preparation method of catalyst is substantially the same as that of Example 1, except that silver nitrate aqueous solution (397.5 μ L, 10 mg mL -1 ) was configured into 1 mL of Ag(NH 3 ) 2 OH solution, the rest of the steps are the same; further character analysis and performance testing are carried out, and embodiment 3 can achieve the purpose of the invention.

[0042] Test results: Ag / α-Co(OH) with different Ag loading contents were prepared by changing the concentration of added silver ammonia solution 2 The catalyst was subjected to X-ray diffraction and scanning electron microscopy results indicating the successful loading of Ag nanoclusters. A linear voltammetry sweep test was performed on it, such as image 3 Shown, embodiment 2 shows that when the current density is 10mA / cm -2 , the prepared Ag-supported Ag / α-Co(OH) 2 The overpotential of catalyst is reduced to 278mV, embodiment 3 shows that when current...

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Abstract

The invention belongs to the field of new energy materials and electrochemical catalysis, and discloses a preparation method and application of a silver-loaded Ag / alpha-Co(OH)2 oxygen evolution catalyst. The transition metal oxygen evolution catalyst is prepared by a simple and convenient photochemical deposition method, and due to the introduction of noble metal Ag, the catalytic material generates a surface plasma resonance effect under laser irradiation, so that the electro-catalytic oxygen evolution reaction performance is further improved. The composite catalyst shows excellent OER catalytic performance in 1.0 M KOH electrolyte under the irradiation of green laser with different powers. The overpotential of the Ag / alpha-Co(OH) (2-3%) is 278 mV under the current density of 10 mA cm <-2 >. During green laser irradiation, the overpotentials are respectively reduced to 269mV and 243mV under the light intensity of 500mW and 1000mW. The catalyst provided by the invention can be used as an electrocatalyst in the field of renewable fuel cells, rechargeable metal-air cells or electrolyzed water.

Description

technical field [0001] The invention belongs to the field of new energy materials and electrochemical catalysis, and relates to a preparation method of a transition metal oxygen evolution catalyst, in particular to an Ag / α-Co(OH) 2 Preparation methods of nanocomposites. Background technique [0002] The development and application of new energy and energy transfer technologies can largely solve the problems of increasingly serious environmental pollution and increasing energy demand. Among the many approaches, water electrolysis has attracted much attention as a promising renewable clean energy technology. The water splitting reaction can be divided into two half-reactions, the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). However, the oxygen evolution reaction (OER) is a slow kinetic process during electron transfer, which may increase the energy consumption of water electrolysis and reduce the overall efficiency. To improve energy conversion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89H01M4/90C25B1/04C25B11/091
CPCB01J23/8913B01J35/0033H01M4/9016H01M4/9041C25B1/04Y02E60/36Y02E60/50
Inventor 张蓉仙宁天雅柯文韬曹珈旖尚子彬吴静波何苗苗
Owner JIANGSU UNIV
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