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Method of preparing anode catalysis electrode for preparing hydrogen by electrolyzing coal slurry

A catalytic electrode and anode technology, applied in the field of electrochemical deposition technology, can solve the problems of low electrocatalytic activity, reduce the service life of electrodes, corrosion of titanium substrate, etc., and achieve the effect of increasing specific surface area, improving catalytic activity and prolonging service life

Inactive Publication Date: 2007-10-17
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first two types of electrodes need to use platinum metal, which leads to expensive electrodes and low electrocatalytic activity, which is not suitable for large-scale application; the above-mentioned third type of electrodes is the electrodes studied in the previous stage. The specific surface area of ​​the noble metal catalyst layer deposited on the surface of the titanium substrate does not increase to a large extent, and the sulfuric acid electrolyte is easy to cause corrosion of the titanium substrate, reducing the service life of the electrode

Method used

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  • Method of preparing anode catalysis electrode for preparing hydrogen by electrolyzing coal slurry
  • Method of preparing anode catalysis electrode for preparing hydrogen by electrolyzing coal slurry
  • Method of preparing anode catalysis electrode for preparing hydrogen by electrolyzing coal slurry

Examples

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Effect test

Embodiment 1

[0025] This example is Ti / TiO 2 - Preparation of Pt anode catalytic electrode. Its preparation steps are as follows:

[0026] (1) Pretreatment of the metal titanium substrate: firstly, the metal titanium substrate is polished and polished, then placed in acetone for ultrasonic degreasing for 5 minutes, then ultrasonically cleaned with twice distilled water, and then treated with a certain concentration of hydrofluoric acid for 1 minute , then rinsed with hot double distilled water, and dried for later use.

[0027] (2) Layered porous TiO on titanium-based surface 2 Preparation of thin film: put the above pretreated titanium substrate in an electrolytic cell, oxidize it in a sulfuric acid electrolyte with a concentration of 1mol / L for 5 minutes, control a certain potential, that is, a DC voltage of 120V, and finally obtain a layered porous TiO 2 Film, this is the prepared state oxide film;

[0028] (3) Treat the above prepared oxide film with low concentration (5%) HF for 1...

Embodiment 2

[0032] This example is Ti / TiO 2 -Preparation of the Pt-Ru anode catalytic electrode, wherein the molar ratio of Pt and Ru in the plating solution is 1:2, and the preparation steps are the same as before.

[0033] The preparation steps of this embodiment are exactly the same as those of the above-mentioned embodiment 1. The difference is in (4) step: before plating, the catalyst solution is a concentration of 5 × 10 -3 mol / L of H 2 PtCl 6 6H 2 O and 1×10 -2 mol / L RuCl 3 mixture.

[0034] TiO in this example 2 The cyclic voltammetry curve of surface deposited Pt-Ru (molar ratio Pt:Ru=1:2) is shown in Figure 2

Embodiment 3

[0036] This example is Ti / TiO 2 -Preparation of the Pt-Ir anode catalytic electrode, wherein the molar ratio of Pt and Ir in the plating solution is 1:2, and the preparation steps are the same as before.

[0037] The preparation steps of this embodiment are exactly the same as those of the above-mentioned embodiment 1. The difference is in (4) step: before plating, the catalyst solution is a concentration of 5 × 10 -3 mol / L of H 2 PtCl 6 6H 2 O and 1×10 -2 mol / L of IrCl 3 mixture.

[0038] TiO in this example 2 The cyclic voltammetry curve of surface deposited Pt-Ir (molar ratio Pt:Ir=1:2) is shown in Figure 3

[0039] A comparative test between the anode catalytic electrode prepared in the embodiment of the present invention and other different electrodes; test the I-V curves of different electrodes in the process of electrolyzing coal slurry.

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Abstract

The present invention relates to a method for preparing anode catalyse electrodes for coal liquid electroanalysis for hydrogen making, especially to a method for preparing anode catalyse electrodes by depositing platinum, ruthenium and iridium catalysis layer on a nanometer porous titanic oxide thin film of substrate titanium through cyclic voltammetry, and belongs to the field of electrochemical deposition process engineering. Said preparation method in accordance with the present invention comprises the following steps: (1) pretreatment of metallic titanium substrate; (2) generation of titanium substrate surface layered porous TiO2 thin films; (3) cleaning processing of surfaces; (4) precious metal catalysis layer deposition on the TiO2 thin film; wherein the main process and step is that in the electrolytic tank, sulfuric acid is selected as supporting electrolyte, one or two of precious metal catalyzer solutions, such as H2PtCl66H2O, RuCl3 and IrCl3, are added therein. Within the electric potential range of -0.2-0.5 V, a scan with a scanning velocity of 50mV is performed under ultrasound shocking or magnetic stirring, wherein the deposition thickness of the catalysis layer is controlled by the number of scan turns. Composite electrodes such as Ti / TiO2-Pt-Ru and Ti / TiO2-Pt-Ir prepared in accordance with the present invention are catalysis electrodes of high activity and can improve the electrolysis electric current density and electrolysis electrical current efficiency.

Description

technical field [0001] The invention relates to a method for preparing an anode catalytic electrode for electrolytic coal slurry hydrogen production, in particular to a method for preparing an anode catalytic electrode for depositing platinum, ruthenium and iridium catalytic layers on a nanoporous titanium dioxide film by cyclic voltammetry, which belongs to electrochemical Deposition process technology field. Background technique [0002] The electrolysis process technology of coal was reported as early as the early 1930s. In the later development process, due to the use of expensive pure Pt sheets or Pt meshes as electrodes, electrolytic cells or electrolytic cells with high impedance and low reaction rates tank, not only the electrolysis reaction current is too small, but also the electrolysis efficiency is low, which increases the cost of hydrogen production. [0003] In 1979, Coughlim and Forooque published a paper on the production of hydrogen from coal decomposition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/08C25B11/10C25B1/02
Inventor 印仁和姬学彬张磊吕士银石新红
Owner SHANGHAI UNIV
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