Multi-layered oxygen electrode with peroxide decomposition catalyst
A layered oxygen electrode incorporating a peroxide decomposition catalyst. The design of the oxygen electrode promotes oxygen dissociation and absorption within the oxygen electrode. The oxygen electrode has differing layers of hydrophobicity which allow chemical impregnation of the active catalyst material into the oxygen electrode where the active catalyst material is needed most.
1. An oxygen electrode comprising:
a porous active material layer;
a porous gas diffusion layer disposed adjacent to said porous active material layer; and
a peroxide decomposition catalyst incorporated within said active material layer;
a first current collector grid disposed adjacent to said porous active material layer opposite said porous gas diffusion layer; and
a second current collector grid disposed adjacent to said porous gas diffusion layer opposite said porous active material layer;
said porous active material layer and said porous gas diffusion layer each having a built-in hydrophobic character wherein said porous gas diffusion layer has a greater hydrophobic character than said porous active material layer.
2. The oxygen electrode according to claim 1 , wherein said porous active material layer comprises 0–50% by weight of said peroxide decomposition catalyst.
3. The oxygen electrode according to claim 1 , wherein said peroxide decomposition catalyst is incorporated onto the surface of said active material layer.
4. The oxygen electrode according to claim 1 , wherein said peroxide decomposition catalyst is selected from a group consisting of MnO 2 , MnO, MoO 3 , KMnO 2 , cobalt oxides, nickel oxides, iron oxides, transition metal oxides, and mixtures thereof.
5. The oxygen electrode according to claim 1 , wherein said porous active material layer comprises a carbon matrix.
6. The oxygen electrode according to claim 5 , wherein said carbon matrix comprises a plurality of polytetrafluoroethylene coated carbon particles.
7. The oxygen electrode according to claim 6 , wherein said plurality of polytetrafluoroethylene particles contain 15–25% polytetrafluoroethylene by weight.
8. The oxygen electrode according to claim 5 , wherein said carbon matrix is impregnated with an active catalyst material.
9. The oxygen electrode according to claim 8 , wherein said active catalyst material is impregnated within said carbon matrix using a precursor selected from a group consisting of AgNO 3 , a AgNO 3 /Ga(NO) 3 mixture, a AgNO 3 /LiNO 3 mixture, Co(NO 3 ) 2 , a cobalt amine complex, NI(NO 3 ) 2 , Mn(NO 3 ) 2 , cyano complexes, organo-metallic complexes, amino complexes, citrate/tartrate/lactate/oxalate complexes, transition metal complexes, and mixtures thereof.
10. The oxygen electrode according to claim 8 , wherein said active catalyst material forms submicron to nano particles within said carbon matrix.
11. The oxygen electrode according to claim 8 , wherein said carbon matrix is chemically impregnated with said active catalyst material.
12. The oxygen electrode according to claim 8 , wherein said carbon matrix is electrochemically impregnated with said active catalyst material.
13. The oxygen electrode according to claim 8 , wherein said carbon matrix is impregnated with said active catalyst material via chemical vapor deposition.
14. The oxygen electrode according to claim 8 , wherein said carbon matrix is impregnated with said active catalyst material via plasma vapor deposition.
15. The oxygen electrode according to claim 1 , wherein said porous gas diffusion layer comprises a carbon matrix.
16. The oxygen electrode according to claim 15 , wherein said carbon matrix comprises a plurality of polytetrafluoroethylene coated carbon particles.
17. The oxygen electrode according to claim 16 , wherein said plurality of polytetrafluoroethylene coated carbon particles contains 40–60% polytetrafluoroethylene by weight.
18. The oxygen electrode according to claim 1 , wherein said first current collector grid and said second current collector grid each comprise at least one selected from the group consisting of mesh, grid, matte, expanded metal, foil, foam and plate.