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iro 2 Metal oxide electrode modified by nanoparticle self-assembly, preparation method and application
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A nanoparticle and oxide technology, applied in electrodes, nanotechnology, electrolytic components, etc., can solve problems such as poor electrode stability, and achieve the effects of short time consumption, improved utilization, and excellent electron transfer rate.
Active Publication Date: 2022-06-28
SHAANXI UNIV OF SCI & TECH
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[0004] The object of the present invention is to overcome the shortcoming that the electrode prepared with polycarboxylic acid and phosphoric acid as bridging molecules has poor stability in weakly acidic and alkaline aqueous solutions, and provide IrO 2 Metal oxide electrode modified by nanoparticle self-assembly, preparation method and application
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Embodiment 1
[0035] Self-assembly of connected monolayers of IrO on ITO 2 The preparation of nanoparticle electrodes is carried out as follows:
[0036] (1) Preparation of IrO 2 Nanoparticles
[0037] Weigh 0.0706g IrCl 3 ·3H 2 O, add 2 mL of 1M KOH and 20 mL of deionized water, and stir for 72 h at room temperature in air to obtain IrO-containing 2Aqueous solution of nanoparticles, IrO 2 The average particle size of the nanoparticles is about 1.3 nm.
[0039] Put the ITO into 75% ethanol, take it out to dry after ultrasonic treatment for 5 minutes;
[0040] Weigh 0.4 mg of 4,4'-bipyridine and dissolve it in 25 mL of methanol, soak the above washed ITO in it for 1 hour, take it out, rinse it with methanol, and dry it in the air;
[0041] Take 2.36mL of step (1) containing IrO 2 The aqueous solution of nanoparticles was added to 25 mL of methanol solution, then ITO was put into it, taken out after 1 hour, rinsed with methanol, and dried in the air...
Embodiment 2
[0048] (1) Preparation of IrO 2 Nanoparticles
[0049] Weigh 0.706g IrCl 3 ·3H 2 O, add 2 mL of 1M NaOH and 20 mL of deionized water, and stir under oxygen for 24 hours to obtain IrO-containing 2 Aqueous solutions of nanoparticles.
[0050] (2) Electrode preparation
[0051] Put the FTO into 75% ethanol, and take it out to dry after ultrasonic treatment for 5 minutes;
[0052] Weigh 0.4 mg of 4,4'-bipyridine and dissolve it in 25 mL of methanol, soak the above washed FTO in it for 1 hour, take it out, rinse it with methanol, and dry it in the air;
[0053] Take 2.36mL of step (1) containing IrO 2 The aqueous solution of nanoparticles was added to 25 mL of methanol solution, then FTO was placed in it, taken out after 1 hour, rinsed with methanol, and dried in air to prepare FTO-bpy-IrO 2 electrode.
Embodiment 3
[0055] Porous TiO 2 The electrodes were placed in 75% ethanol, ultrasonically treated for 5 minutes, and then taken out to dry;
[0056] Weigh 0.4 mg of 4,4'-bipyridine and dissolve it in 25 mL of methanol. 2 The electrode was immersed in it for 0.5 hours, rinsed with methanol after taking it out, and dried in the air;
[0057] Take 2.36mL of step (1) containing IrO 2 The aqueous solution of nanoparticles was added to 25 mL methanol solution, after which the porous TiO 2 The electrode was placed in it, taken out after 1 hour, rinsed with methanol, and air-dried to obtain porous TiO 2 Electrode-bpy-IrO 2 electrode.
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Abstract
The present invention discloses IrO 2 The invention relates to a metaloxideelectrode modified by self-assembly of nanoparticles, a preparation method and an application thereof, belonging to the field of electrode modification. The preparation method of the present invention is simple and convenient, takes a short time, and can ensure that IrO 2 Monolayer Adsorption of Nanoparticles on MetalOxideElectrode Surfaces. The present invention utilizes a pyridyl nitrogen in the 4,4'-bipyridine structure to form a coordination bond with a high-valent metalion on the surface of a metaloxideelectrode, and another pyridyl nitrogen to form a coordination bond with IrO 2 Ir in nanoparticles 4+ Coordination bonds are formed, thereby realizing the IrO 2 Monolayer Adsorption of Nanoparticles on MetalOxideElectrode Surfaces. IrO of the present invention 2 Nanoparticle Self-Assembled Modified MetalOxide Electrodes, IrO 2 Nanoparticles and metal oxide electrodes are connected by coordination bonds through 4,4'-bipyridine as a bridging structure. The metal oxide electrode of the present invention can be stable in strongly acidic, neutral and strongly alkaline aqueous solutions and organic solvents.
Description
technical field [0001] The invention belongs to the field of electrode modification, especially IrO 2 Nanoparticle self-assembly modified metal oxide electrode, preparation method and application. Background technique [0002] The construction of nanoparticle-modified electrodes has broad application prospects in the fields of sensing, electrocatalysis, and energy storage. The electrochemical activity of nanoparticle-modified electrodes can be tuned by changing the size and shape of the nanoparticles, the chemical environment of the active center, and the nanoparticle-electrode interface. A large number of experimental and theoretical studies have been carried out on the electrochemical and electron transfer kinetics of self-assembled monolayers, while the use of self-assembled monolayers to attach oxide nanoparticles to electrode surfaces is relatively rare. IrO through self-assembled films 2 Nanoparticles are attached to the electrode surface, which can maximize the use...
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