Active support for cathode catalysts
Novel active supports, novel catalysts, and methods of preparing active supports using a sacrificial template particles and methods of preparing the same are all described.
1. A method for forming a catalyst comprising:
forming an active support by:
combining metal-nitrogen-carbon (M-N—C) precursors and sacrificial template particles;
allowing the M-N—C precursors to polymerize to produce a polymer;
heat treating the polymer to form active sites in the polymer; and
removing the sacrificial template particles to produce a porous active support; and
decorating the active support with a catalytic material.
2. The method of claim 1 wherein the M-N—C precursors comprise one or more transition metal precursors and one or more precursors containing nitrogen and carbon.
3. The method of claim 2 wherein the transition metal precursor is a precursor of iron.
4. The method of claim 1 wherein heat treating comprises pyrolysis.
5. The method of claim 1 wherein the catalytic material is platinum or a platinum group metal.
6. The method of claim 5 wherein the catalytic material is platinum and the catalyst is loaded with less than 40 wt % platinum.
7. The method of claim 5 wherein the catalytic material is platinum and the catalyst is loaded with less than 20 wt % platinum.
8. The method of claim 5 wherein the catalytic material is platinum and the catalyst is loaded with less than 10 wt % platinum.
9. The method of claim 1 wherein the catalytic material is a platinum group metal.
10. The method of claim 1 wherein the catalytic material is a non-platinum group metal (non-PGM).
11. The method of claim 1 wherein the catalytic material is selected from the group consisting of Pt, RuCh, MCh, and bioenzymes; where M is a transition metal and Ch is S, Se, and/or Te.
12. The method of claim 1 wherein the catalytic material has a different catalytic pathway from the active sites in the polymer, such that two different catalytic pathways are present in the catalyst.
13. The method of claim 12 wherein one of the catalytic pathways is a four electron pathway and the other catalytic pathway is a two electron pathway.
14. A porous hybrid catalyst comprising:
a porous support formed from metal, nitrogen, and carbon and containing a plurality of active sites dispersed throughout the support; and
a catalytic material decorated on the surface of the porous support.
15. The porous hybrid catalyst of claim 14 wherein the catalytic material has a different catalytic pathway from the active sites in the porous support.
16. The porous hybrid catalyst of claim 14 wherein the metal in the porous support is a transition metal.
17. The porous hybrid catalyst of claim 16 wherein the transition metal is iron.
18. The porous hybrid catalyst of claim 14 wherein the catalytic material is selected from the group consisting of Pt, PdM, RuCh, MCh and bioenzymes; where M is a transition metal and Ch is S, Se, and/or Te.
19. The porous hybrid catalyst of claim 14 wherein the catalytic material has a different catalytic pathway from the active sites in the porous support, such that two different catalytic pathways are present in the catalyst.
20. The porous hybrid catalyst of claim 19 wherein one of the catalytic pathways is a four electron pathway and the other catalytic pathway is a two electron pathway.