Catalyst nanoarchitectures with high activity and stability
In some embodiments, a method may include forming a catalytic nanoarchitecture. The method may include heating a non-catalytic metal compound within a specified temperature range and atmosphere in the presence of a catalytic metal. In some embodiments, heating the non-catalytic metal may include heating within a hydrogen-containing atmosphere. The method may include transforming a first architecture of the non-catalytic metal to a second architecture. The second architecture may include openings in the second architecture. The method may include incorporating the catalytic metal into the openings in the second architecture such that the catalytic metal is integrated into the second architecture. In some embodiments, the method may include increasing a catalytic activity of the catalytic metal by integrating the catalytic metal into the second architecture.
1. A method of forming a catalytic structure, comprising:
heating the combination of a non-catalytic metal compound that is within a first architecture, comprising a network composed of interconnected solid domains and porosity, and a catalytic metal within a specified temperature range and atmosphere, wherein the specified temperature range ranges from 150 to 350 degrees Celsius, and wherein the first architecture is formed from a non-catalytic metal moiety and nonmetallic moieties of the non-catalytic metal compound;
transforming the first architecture composed of the non-catalytic metal compound and the catalytic metal to a second architecture comprising openings in the second architecture, wherein the second architecture does not comprise carbon, and wherein the first and the second architecture comprises a two-dimensional architecture consisting of nanosheets;
resulting in interaction of the catalytic metal with the non-catalytic metal within an integrated network of domains within the second architecture; and
increasing a catalytic activity or stability of the catalytic metal by interaction of the catalytic metal with the non-catalytic metal within the second architecture.
2. The method of claim 1 , wherein the nanosheets comprise thicknesses of less than 20 nm and thickness to lateral dimensions (width or length) ratios of at least 4.
3. The method of claim 1 , further comprising heating the combination of non-catalytic metal compound and a catalytic metal within a hydrogen-containing atmosphere.
4. The method of claim 1 , further comprising heating the combination of non-catalytic metal compound and a catalytic metal within an ammonia-containing atmosphere.
5. The method of claim 1 , wherein the network is composed of interconnected solid domains with at least one dimension of at least 100 nm.
6. The method of claim 1 , wherein the network is composed of pores with dimensions of at least 2 nm.
7. The method of claim 1 , wherein the specified temperature range ranges from 150 to 250 degrees Celsius.
8. The method of claim 1 , wherein the non-catalytic metal compound contains nickel, cobalt, iron, manganese, chromium, vanadium, copper, zinc, zirconium, niobium, molybdenum, indium, tin, tantalum, tungsten, aluminum or gallium, lead or bismuth.
9. The method of claim 1 , wherein the non-catalytic metal compound comprises a combination of more than one transitional metal including nickel, cobalt, iron, manganese, chromium, vanadium, copper, zinc, zirconium, niobium, molybdenum, indium, tin, tantalum, tungsten, aluminum or gallium, lead or bismuth.
10. The method of claim 1 , wherein the non-catalytic metal compound comprises a metal hydroxide.
11. The method of claim 1 , wherein the non-catalytic metal compound comprises a nickel hydroxide or cobalt hydroxide.
12. The method of claim 1 , wherein the non-catalytic metal compound comprises a metal oxide.
13. The method of claim 1 , wherein the non-catalytic metal compound comprises a nickel oxide or cobalt oxide.
14. The method of claim 1 , wherein the non-catalytic metal compound comprises a metal oxyhydroxide.
15. The method of claim 1 , wherein the catalytic metal comprises platinum, iridium, osmium, gold, silver, palladium, rhodium, or ruthenium.
16. The method of claim 1 , wherein the non-catalytic metal compound is combined with more than one catalytic metal comprising platinum, iridium, osmium, gold, silver, palladium, rhodium, or ruthenium.
17. The method of claim 1 , further utilizing chemical leaching to remove unstable metals within the second architecture.
18. The method of claim 1 , further utilizing a second temperature/atmosphere treatment step to modify the second architecture.
19. The method of claim 1 , further utilizing an electrochemical treatment step to modify the second architecture.