EP0035017A1 - Catalytically active anode - Google Patents

Catalytically active anode

Info

Publication number
EP0035017A1
EP0035017A1 EP80900603A EP80900603A EP0035017A1 EP 0035017 A1 EP0035017 A1 EP 0035017A1 EP 80900603 A EP80900603 A EP 80900603A EP 80900603 A EP80900603 A EP 80900603A EP 0035017 A1 EP0035017 A1 EP 0035017A1
Authority
EP
European Patent Office
Prior art keywords
anode
metal
anode according
silicate
binder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP80900603A
Other languages
German (de)
English (en)
French (fr)
Inventor
Anselm Thomas Kuhn
Alfred Chan Chung Tseung
Christopher Francis Brammall
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0035017A1 publication Critical patent/EP0035017A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/36Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

Definitions

  • metal suicide the metal being one of Pt, Pd, Ir, Eh, Cr, Co, Ni, Ru, Ti, V, Zr, Nb, Hf, Ta and V.
  • the invention consists in a catalytically active anode comprising at its surface an at least semiconductive water- insoluble metal silicate.
  • the anode is made by dispersing the metal silicate in a non-conductive binder, and applying the dispersion to a conductive substrate.
  • the silicate is reduced sufficiently to improve its electrical conductivity.
  • the binder is hydrophobic, for example polytetrafluoroethylene, but the dispersion as a whole should not be excessively hydrophobic.
  • the metal silicate may have a spinel or olivine structure, both of which are reported to have been synthesised.
  • the olivine is convenient. It is preferably cobalt orthosilicate (Co SiO. )
  • the substrate is preferably in the form of an electrically conductive sheet (foraminate or otherwise), slit metal or mesh, preferably of nickel. If of iron, the substrate preferably contains under 1.5% (more preferably under -0.3%) of carbon.
  • the weight ratio of binder to metal silicate is from l-3 > more preferably from 1:5 > to 1:20 and the dispersion is preferably applied to give a coating of from 5 m 9 to 50mg of the metal silicate per square centimetre of the substrate.
  • the invention extends to a catalytically active anode made as set forth above, and to an electrolytic cell including a cathode and such an anode. The invention further extends to a method of electrolysis using this cell, especially of aqueous solutions, e.g. aqueous alkali. The invention will now be described by way of example. MAKING AN ANODE
  • transition metal silicates include precipitation from sodium silicate solution, and gelling using tetraethyl orthosilicate, it was found that solid state sintering gave the best results.
  • Cobalt nitrate was ground with a stoichiometric amount of silica with a pestle and mortar.
  • the mixture of cobalt nitrate and silica was transferred to an evaporating basin, gently heated to allow the nitrate to dissolve in its own water of crystallis- ation and then vigorously heated by bunsen burner to dry and decompose the nitrate to its oxide.
  • the resultant powder was o , ground again and then heated at 1000 C for 24 hours, to promote the reaction 2Co0 + SiO —>Co SiO..
  • the product was ground again, washed with 5M KOH and then with concentrated HN0 to remove any unreacted silica or cobalt oxide, then washed with water, dried, ground again and put in a dry sample bottle. That the product was cobalt silicate (olivine structure) was confirmed by X-ray powder diffraction.
  • the electrode so formed was dried and cured for 1 hour at 300 C. Initially a cobalt silicate: polytetrafluoroethylene ratio of 10:3 was used, but as this proved to be too hydrophobic, the present electrode used a ratio of 10:1, giving a cobalt silicate loading of 21 mg/ /cm2.
  • ELECTROLYSIS An aqueous solution of 5 KOH was electolysed at 40 C in a cell having a nickel mesh cathode and the above anode. (The anode had previously been anodised for 2 hours at 2V vs the dynamic hydrogen electrode, to activate it, possibly by forming higher oxides on its surface and hydr ⁇ phiusing it. ) The current was held at 1 amp. Oxygen was evolved at the anode, at which the voltage vs. the dynamic hydrogen electrode rose from an initial' 1700mV, neglecting early fluctuations, to 174 ⁇ mV after 40 days, possibly due to formation of a poorly conductive nickel oxide at the interface between screen and cobalt silicate. An identical cell (but with cobalt silicate loading of l4 mg/cm ) was run at 25 C, 50 C and 70 C at up to 2-g-A/cm . At
  • iron silicate might be corroding at up to 6 mg/cm /week at

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
EP80900603A 1979-04-10 1980-10-23 Catalytically active anode Withdrawn EP0035017A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7912624 1979-04-10
GB7912624 1979-04-10

Publications (1)

Publication Number Publication Date
EP0035017A1 true EP0035017A1 (en) 1981-09-09

Family

ID=10504466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80900603A Withdrawn EP0035017A1 (en) 1979-04-10 1980-10-23 Catalytically active anode

Country Status (4)

Country Link
EP (1) EP0035017A1 (cs)
JP (1) JPS56500377A (cs)
GB (1) GB2048945A (cs)
WO (1) WO1980002163A1 (cs)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2020482C (en) * 1990-07-05 1999-10-12 Sellathurai Suppiah Supported high silica zeolites
JP5729163B2 (ja) * 2011-06-24 2015-06-03 トヨタ自動車株式会社 負極活物質及び負極活物質の製造方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1915951A1 (de) * 1969-03-28 1970-10-08 Basf Ag Verfahren zur Herstellung von Elektroden
US3711382A (en) * 1970-06-04 1973-01-16 Ppg Industries Inc Bimetal spinel surfaced electrodes
US3798063A (en) * 1971-11-29 1974-03-19 Diamond Shamrock Corp FINELY DIVIDED RuO{11 {11 PLASTIC MATRIX ELECTRODE
US3963593A (en) * 1972-09-15 1976-06-15 Ppg Industries, Inc. Electrodes having silicide surface
GB1448989A (en) * 1972-12-13 1976-09-08 Nat Res Dev Coated substrates for use as corrosion resistant electrodes for electrochemical use

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8002163A1 *

Also Published As

Publication number Publication date
WO1980002163A1 (en) 1980-10-16
JPS56500377A (cs) 1981-03-26
GB2048945A (en) 1980-12-17

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19810508

AK Designated contracting states

Designated state(s): DE FR GB

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19830218