Electrode

Patent metadata

Field	Value
Publication number	US-2018265996-A1
Application number	US-201615761127-A
Country	US
Kind code	A1
Filing date	Sep 22, 2016
Priority date	Sep 25, 2015
Publication date	Sep 20, 2018
Grant date	—

Abstract

An electrode ( 10 ) is disclosed. The electrode ( 10 ) comprises an electrode substrate ( 20 ). A layer of TiO x ( 30, 40 ) with a total thickness in the range of between 40-200 μm is present on at least one surface of the electrode substrate ( 20 ) and a porosity of layer of TiO x ( 30, 40 ) is below 15%. An electro-catalytic layer ( 50 ) comprising oxides of ruthenium and cerium according comprising at least 50 molar % ruthenium oxides is present on layer of TiO x ( 30, 40 ) and wherein x is in the range 1-2 for the layer of TiO x . A process for the manufacture of the electrode ( 10 ) is disclosed as are uses thereof.

First claim

1 . An electrode comprising:
an electrode substrate, a layer of TiO x with a total thickness in the range of between 40-200 μm on at least one surface of the electrode substrate wherein a porosity of the layer of TiO x is below 15%, an electro-catalytic layer comprising oxides of ruthenium and cerium comprising at least 50 molar % ruthenium oxide on the layer of TiO x and wherein x is in the range 1-2 for the layer of TiO x .

2 . The electrode according to claim 1 , wherein the electrode substrate is titanium.

3 . The electrode according to claim 1 wherein the layer of TiO x comprises at least 50 molar % TiO x .

4 . The electrode according to claim 1 , wherein a first layer of TiO x has a porosity lower than a second layer of TiO x .

5 . The electrode according to claim 1 , wherein a thickness of a first layer of TiO x is in the range of between 20-120 μm and a thickness of the second layer of TiO x is in the range of between 20-120 μm.

6 . The electrode according to claim 1 wherein the at least one layer of TiO x comprises oxides of chromium.

7 . The electrode according to claim 1 , wherein x is between 1.6-1.9 for the at least one layer of TiO x .

8 . The electrode according to claim 1 , wherein the electro-catalytic layer provides a ruthenium content in an amount of between 2-25 gm −2 .

9 . The electrode according to claim 1 , wherein the electro-catalytic layer comprises ruthenium oxide in an amount of between 50-95 molar % and cerium oxide in an amount of between 5-25 molar %.

10 . The electrode according to claim 1 , wherein at least 95% of the ruthenium from the electro-catalytic layer penetrates the layer of TiO x to no more than 30% of a total thickness of the layer of TiO x .

11 . A method comprising using the electrode according to claim 1 as a cathode in an electrolytic process.

12 . The method according to claim 11 , wherein the electrolytic process comprises manufacture of hydrogen gas at the cathode.

13 . A process of manufacturing an electrode, the process comprising the steps:
i) providing an electrode substrate, ii) coating at least one surface of the electrode substrate by plasma spraying to form a layer of TiO x with a total thickness in the range of between 40-200 μm on the at least one surface of the electrode substrate to provide a porosity of the layer of TiO x of below 15%, iii) forming an electro-catalytic layer comprising oxides of ruthenium and cerium comprising at least 50 molar % ruthenium oxide on the layer of TiO x wherein x is in the range 1-2 for the layer of TiO x .

14 . The process according to claim 13 , wherein the electrode substrate is titanium.

15 . The process according to claim 13 , wherein the at least one surface of the electrode substrate is roughened to provide an R a value in the range of between 1-6 μm prior to step ii).

16 . The process according to claim 13 , wherein forming the electro-catalytic layer on the layer of TiO x comprises a heating step and a thermolysis step of a combination of ruthenium and cerium compounds.

17 . The process according to claim 13 , wherein the combination of ruthenium and cerium compounds provides ruthenium oxide in an amount of between 50-95 molar % and cerium oxide in an amount of between 5-25 molar %.

18 . The process according to claim 16 , wherein the heating step is carried out for a time of between 5-15 minutes at a temperature of between 70-100° C.

19 . The process according to claim 16 , wherein the thermolysis step is carried out for a time of between 10-15 minutes at a temperature of between 450-550° C.

Assignees

• Akzo Nobel Chemicals Int Bv

Inventors

• Rosvall Magnus
• Amerio Ezio
• Gustavsson John
• Holmin Susanne
• Bergman Lars-Erik

Classifications

• C25C7/02

  Electrodes (consumable anodes for the refining the metals C25C1/00 - C25C5/00); Connections thereof · CPC title

• C25B1/265 Primary

  Chlorates · CPC title

• C25D17/10

  Electrodes {, e.g. composition, counter electrode} · CPC title

• C02F2001/46142

  Catalytic coating · CPC title

• C25B11/0484 Primary

  Chemistry & Metallurgy · mapped topic