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Title:
ELECTROLYSIS ELECTRODE, POSITIVE ELECTRODE FOR PRODUCING OZONE ELECTROLYSIS, POSITIVE ELECTRODE FOR PRODUCING PERSULFATE ELECTROLYSIS, AND POSITIVE ELECTRODE FOR CHROMIUM ELECTROLYTIC OXIDATION
Document Type and Number:
WIPO Patent Application WO/2012/036196
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide an electrolysis electrode used in electrolytic oxidation reactions, the electrode having a high oxygen overvoltage and extended service life. The electrolysis electrode has an electrode surface layer formed from a valve metal oxide film by a high-temperature heat treatment at a low oxygen partial pressure of 100 Pa or less; the layer directly underneath the electrode surface layer comprising a valve metal and a noble metal other than silver (Ag); and the noble metal being precipitated and dispersed in the crystal grain boundaries of the valve metal; wherein the crystals of the valve metal to a depth within 30 µm in a perpendicular direction from the electrode surface are elongated crystal grains in a cross section cut perpendicularly to the electrode surface; and the content of the noble metal to a depth within 10 µm in the perpendicular direction from the electrode surface is 5 at.% or less.

Inventors:
OKAZAKI TSUYOSHI
EZAWA NOBUYASU
Application Number:
PCT/JP2011/070972
Publication Date:
March 22, 2012
Filing Date:
September 14, 2011
Export Citation:
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Assignee:
TANAKA PRECIOUS METAL IND (JP)
OKAZAKI TSUYOSHI
EZAWA NOBUYASU
International Classes:
C25B11/10; C01B13/11; C02F1/46; C02F1/461; C25B1/00; C25B1/13; C25B1/30; C25D17/12
Domestic Patent References:
WO2003000957A12003-01-03
Foreign References:
JP2005539135A2005-12-22
JPH0885894A1996-04-02
JP2001262385A2001-09-26
JP2010156034A2010-07-15
JPH02282491A1990-11-20
JP2007016303A2007-01-25
JP2006131987A2006-05-25
JP2007224351A2007-09-06
JP2007046129A2007-02-22
JP2006097122A2006-04-13
Other References:
See also references of EP 2617876A4
Attorney, Agent or Firm:
OGURI Shohei et al. (JP)
Shohei Oguri (JP)
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Claims:



 
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