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
EZAWA NOBUYASU
Application Number:
PCT/JP2011/070972
Publication Date:
March 22, 2012
Filing Date:
September 14, 2011
Export Citation:
Assignee:
TANAKA PRECIOUS METAL IND (JP)
OKAZAKI TSUYOSHI
EZAWA NOBUYASU
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:
WO2003000957A1 | 2003-01-03 |
Foreign References:
JP2005539135A | 2005-12-22 | |||
JPH0885894A | 1996-04-02 | |||
JP2001262385A | 2001-09-26 | |||
JP2010156034A | 2010-07-15 | |||
JPH02282491A | 1990-11-20 | |||
JP2007016303A | 2007-01-25 | |||
JP2006131987A | 2006-05-25 | |||
JP2007224351A | 2007-09-06 | |||
JP2007046129A | 2007-02-22 | |||
JP2006097122A | 2006-04-13 |
Other References:
See also references of EP 2617876A4
Attorney, Agent or Firm:
OGURI Shohei et al. (JP)
Shohei Oguri (JP)
Shohei Oguri (JP)
Download PDF:
Claims:
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