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Effective co-catalysts are of key importance for photocatalytic H2 generationfrom aqueous environments. An attractive co-catalyst candidate are AuPt(metastable) alloys due to the synergistic electronic and chemical interactionof the constituents in the charge transfer and H2 evolution process. Here weintroduce the fabrication of AuPt alloy nanoparticles with nanoporosity (poresize of 2-5 nm) fabricated on spaced TiO2 nanotubes. By dewetting a layeredAgAuPt coating, we form AuPtAg alloy nanoparticles. From these alloys, Ag canselectively be dissolved leading to the desired nanoporous AuPt alloy particleswith diameter in the range of 10-70 nm deposited as a gradient on the TiO2nanotubes. A significant enhancement of photocatalytic H2 generation isobtained compared to the same loading of monometallic or nonporous alloy. Thenanoporous AuPt particles provide not only a large surface area to volume ratio(and are thus more effective) but also show the intrinsic synergy of a AuPtalloy for H2 generation.

journal of materials chemistry. a

Nanoporous AuPt and AuPtAg alloy co-catalysts formed by  dewetting-dealloying on ordered TiO2 nanotube surface lead to significantly  enhanced photocatalytic H2 generation