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Cathode material

a technology of cathode material and cathode layer, which is applied in the direction of electrodes with substrates, electrolysis components, electrodes, etc., can solve the problem of high cost and the amount of pt used

Inactive Publication Date: 2017-08-03
JOHNSON MATTHEY PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a new type of cathode material for use in hydrogen evolution reactions, which includes a titanium sheet and nanoparticles of platinum deposited on the surface of the sheet. The platinum nanoparticles form a decoration on the titanium sheet, rather than a continuous coating. The nanoparticle decoration provides a high surface area of catalyst, which improves the efficiency of the hydrogen evolution reaction. The cathode material can be easily prepared by depositing the platinum nanoparticles onto the titanium sheet using various methods such as pulsed electrolysis, nanoparticle deposition, or accelerated nanoparticle deposition. The use of the new cathode material provides higher efficiency and lower costs for hydrogen production.

Problems solved by technology

and the water near the cathode becomes alkaline.
Alternative cathodes that can be used are platinised Ti, where a continuous coating of Pt metal covers the Ti sheet, but in this case the amount of Pt used leads to a high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

lectrolysis Method

[0046]A grit blasted titanium plate 25 mm×25 mm×1 mm thick was held in tetraammineplatinum hydrogen phosphate solution (Q-salt). A series of 1 second pulses at a current density of 20 mA / cm2 (i.e., one second at 20 mA / cm2 followed by one second at 0 mA / cm2) was passed through the system to build up a Pt decorated surface.

[0047]A series of electrodes were coated. The Pt loadings were measured by XRF.

[0048]FIGS. 1 and 2 illustrate platinum decorated titanium plates in accordance with this Example.

example 2

cle Deposition Methods

[0049]Ti sheet electrodes were decorated with Pt nano-particles using the AND process described above. The gas used to create the plasma to sputter the solid Pt target was argon at a pressure of about 0.1 mbar in the sputtering zone and about 0.001 mbar in the deposition zone. Depositions were carried out at accelerating voltages of 0, 1, 3 and 5 kV for sufficient lengths of time to give the Pt loadings shown in Table 2.

[0050]FIG. 3 illustrates a platinum decorated titanium plate in accordance with this Example.

example 3

Testing

[0051]Electrodeposited cathodes were prepared as in Example 1 herein. Four such cathodes were prepared with varying pulse patterns and platinum loadings:

90×1 sec pulses; Pt loading 0.130 mg Pt / cm2 Ti;

60×1 sec pulses; Pt loading 0.097 mg Pt / cm2 Ti;

30×1 sec pulses; Pt loading 0.0504 mg Pt / cm2 Ti;

10×1 sec pulses; Pt loading 0.0146 mg Pt / cm2 Ti;

[0052]A commercial platinized Ti plate and a bare Ti plate were obtained.

[0053]The cathodes were tested by measuring the operating voltage whilst applying a constant current. The lower the voltage the lower the power consumption [Power (watts)=Voltage (volts)×Current (amps)].

[0054]From FIG. 4 it can be seen that the electro deposited Pt cathodes perform at a comparable voltage to a commercial Pt plated electrode. Even at very low levels of Pt (0.0146 mg / cm2) the electrode remains effective for the hydrogen evolution reaction.

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Abstract

A cathode material comprising a titanium sheet and platinum, the platinum being in the form of nanoparticles deposited on at least one side of the titanium sheet, to form a decoration thereon, and processes for the preparation thereof.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a cathode material and in particular to platinum decorated titanium cathode materials having favourable activity characteristics in use. The cathode materials are of particular use in the electrochemical treatment of water.BACKGROUND TO THE INVENTION[0002]Electrochemical water treatment is an effective means for producing clean and germ-free water. Applications include the disinfection of drinking water, swimming pool water and industrial cooling water, for example.[0003]In electrochemical water treatment, electrodes (at least one cathode and one anode) are inserted directly into the volume of water to be disinfected, or into a bypass pipe. A DC voltage is applied between the electrodes, leading to the electrolysis of the water. In water with low concentrations of dissolved ions or other impurities, the main current-consuming electrochemical reactions are:[0004]At the anode, the main product is oxygen—2H2O→O2+4H++2e−,accom...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25B11/04C25B1/06C25D7/00C25D3/50C25D5/18
CPCC25B11/0473C25D3/50C25D5/18C25B11/0415C25B1/06C25B11/0405C25D7/00Y02E60/36C25B1/04C25B11/00C25B11/051C25B11/057C25B11/081
Inventor SHARMAN, JONATHAN DAVID BRERETONKEAN, ALISTAIR HENDERSONOAKES, DANIELWRIGHT, EDWARD ANTHONY
Owner JOHNSON MATTHEY PLC
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