Method for detecting influence of iron ions on generation rate of hydrogen peroxide in iridium dioxide-Nafion electrode oxygen evolution reaction
A detection method and oxygen evolution reaction technology, applied in the field of electrochemistry, can solve problems such as lack of
Pending Publication Date: 2020-08-18
HUBEI UNIV
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Existing literature (such as S.H. Frensch, G.Serre, F. Fouda-Onana, et al. Journal of PowerSources, 2019.420: 54-62 and F. Fouda-Onana, M. Chandesris, V. Medeau, et al. International Journal of Hydrogen Energy, 2016.41 (38): 16627-16636) usually think that Fe 3+ Pollution can cause the generation of H on the cathode side of water electrolysis 2 o 2 , but on the anode side H 2 o 2 Generation and detection, there is still a lack of relevant technology
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[0040] 1. Catalyst slurry configuration: Mix 5 mg of Ir black, 50 μL of 5wt.% Nafion solution and 2 mL of isopropanol, and then ultrasonically disperse for 30 minutes to form a uniform slurry.
[0041] 2. Preparation of the working electrode: pipette 5 μL of the slurry with a micro-sampler, and apply it dropwise on an area of 0.1256 cm 2 The surface of the glassy carbon electrode (the disk electrode of the rotating ring disk electrode) was dried naturally at room temperature. Place the electrode in 0.5M H 2 SO 4 Aqueous solution (pass N 2 Saturation) using cyclic voltammetry (Cyclic Voltammetry, CV) scanning method to clean the electrode surface, scanning speed 100mV s -1 , Scan potential range 0 ~ 1.2V vs. NHE, scan 5 ~ 20 laps. Set the disk electrode potential to 1.45-1.55V, and oxidize at a constant potential for 20-50 minutes to oxidize Ir to IrO 2 .
[0042] 3. Electrochemical detection:
[0043] Working electrode: rotating ring disk electrode (RRDE), counter ele...
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Abstract
The invention provides an electrochemical detection method for the influence of Fe3+ on the generation rate of an IrO2-Nafion electrode oxygen evolution reaction byproduct H2O2, and belongs to the field of electrochemistry. The preparation method comprises the following steps: mixing Ir black, a Nafion solution and a dispersing agent to obtain slurry; coating the surface of a disc electrode of a rotating ring disc electrode with the slurry, then cleaning the surface of the electrode by adopting a cyclic voltammetry scanning method, and then oxidizing Ir black into IrO2 to obtain a working electrode; and forming a three-electrode system by taking a Pt sheet as a counter electrode and a saturated calomel electrode as a reference electrode, and respectively carrying out electrochemical detection in the electrolyte 1 and the electrolyte 2. The electrochemical detection method provided by the invention finds that the existence of Fe3+ in the electrolyte accelerates the generation rate of aby-product H2O2 when a water electrolysis oxygen evolution reaction occurs on the surface of the IrO2-Nafion electrode, and has important significance for prevention and control of Fe3+ in an electrolytic tank material and water supply.
Description
technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a Fe 3+ to IrO 2 -Nafion electrode oxygen evolution reaction by-product H 2 o 2 Electrochemical detection methods for rate effects. Background technique [0002] During the long-term operation of the SPE water electrolytic cell, not only the construction materials will affect its durability, but also the impurity pollution will have different effects on the performance of the electrolytic cell. These impurities are mainly introduced through the corrosion of water supply pipelines, bipolar plates, connecting parts, etc., and the quality of deionized water is not up to standard, which may reduce the performance of the electrolytic cell by affecting the membrane and catalyst. Fe 3+ It is a relatively common variable-valence metal ion pollutant during the operation of the SPE water electrolytic cell, and is often introduced into the electrolytic cell due to component co...
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Login to View More IPC IPC(8): G01N27/48G01N27/416G01N27/38G01N27/32G01N27/30
CPCG01N27/48G01N27/4168G01N27/38G01N27/32G01N27/308Y02E60/36
Inventor 王浚英徐帅汪宝元董文静夏晨朱斌王浩
Owner HUBEI UNIV