Process for preparing a film of an oxide or a hydroxide of an element of groups IIB or IIIA of the periodic table, and the composite structures which include such a film
First Claim
1. Process for depositing a film of a metal oxide or of a metal hydroxide on a substrate in an electrochemical cell, wherein(i) said metal oxide comprises a cation M and said metal hydroxide is of formula M(OH)x Ay, M representing at least one metallic species in an oxidation state i selected from the group consisting of the elements in Groups IIB and IIIA of the Periodic Table, A being an anion whose number of charges is n, said formula satisfies
(ii) said electrochemical cell comprises (a) an electrode comprising said substrate, (b) a counterelectrode, (c) a reference electrode and (d) an electrolyte comprising a conducting solution comprising at least one salt of the metal M, said process comprising the steps of;
x≦
i and x+ny=i,
dissolving oxygen in the electrolyte andimposing a cathode potential of less than the oxygen reduction potential and greater than the potential for deposition of the metal M in the electrolyte in question on the electrochemical cell, whereby the oxidation state of said metal M in said metal salt is the same as the oxidation state of said metal M in said metal oxide or metal hydroxide.
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Abstract
Process for depositing a film of a metal oxide or of a metal hydroxide on a substrate in an electrochemical cell, wherein (i) the metal hydroxide is of formula M(OH)x Ay, M representing at least one metallic species in an oxidation state i chosen from the elements in Groups II and III of the Periodic Table, A being an anion whose number of charges is n, 0<x≦i and x+ny=i,
(ii) the electrochemical cell comprises (a) an electrode comprising the substrate, (b) a counterelectrode, (c) a reference electrode and (d) an electrolyte comprising a conducting solution comprising at least one salt of the metal M, the process comprising the steps of:
dissolving oxygen in the electrolyte and
imposing a cathode potential of less than the oxygen reduction potential and greater than the potential for deposition of the metal M in the electrolyte in question on the electrochemical cell.
50 Citations
28 Claims
- 1. Process for depositing a film of a metal oxide or of a metal hydroxide on a substrate in an electrochemical cell, wherein
(i) said metal oxide comprises a cation M and said metal hydroxide is of formula M(OH)x Ay, M representing at least one metallic species in an oxidation state i selected from the group consisting of the elements in Groups IIB and IIIA of the Periodic Table, A being an anion whose number of charges is n, said formula satisfies - space="preserve" listing-type="equation">0<
x≦
i and x+ny=i,
(ii) said electrochemical cell comprises (a) an electrode comprising said substrate, (b) a counterelectrode, (c) a reference electrode and (d) an electrolyte comprising a conducting solution comprising at least one salt of the metal M, said process comprising the steps of; dissolving oxygen in the electrolyte and imposing a cathode potential of less than the oxygen reduction potential and greater than the potential for deposition of the metal M in the electrolyte in question on the electrochemical cell, whereby the oxidation state of said metal M in said metal salt is the same as the oxidation state of said metal M in said metal oxide or metal hydroxide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- space="preserve" listing-type="equation">0<
-
24. Multilayer structure comprising
a substrate layer supporting a film of a metal hydroxide of formula M(OH)x Ay, M representing at least one metallic species in an oxidation state i selected from the group consisting of the elements in Groups IIB and IIIA of the Periodic Table, A being an anion whose number of charges is n, said formula satisfies 0< - x≦
i and x+ny=i, the substrate layer being a layer of a conductive material selected from the group consisting of iron, steel, copper, gold, a coductive metal oxide and a semiconductor material. - View Dependent Claims (25, 26, 27, 28)
- x≦
Specification