Efficient Photocatalytic H2 Evolution: Controlled Dewetting-Dealloying to Fabricate Site-Selective High-activity Nanoporous Au Particles on Highly Ordered TiO2 Nanotube Arrays

Abstract

Overlaid self-ordering processes: we form anodic self-organized TiO2 nanostumps and exploit them for self-ordering dewetting of Au-Ag sputtered films. This forms ordered particle configurations at tube top (crown position) or bottom (ground position). By dealloying we then form, from minimal amount of noble metal, porous Au nanoparticles that when in crown position allow for a drastically improved photocatalytic H2 production compared with nanoparticles produced by conventional dewetting processes.

References in corpus (3)

• One-dimensional Titanium Dioxide Nanomaterials: Nanotubes
• Hydrogenated anatase: Strong photocatalytic H2 evolution without the use of a co-catalyst
• Suspended Pt nanoparticles over TiO2 nanotubes for enhanced photocatalytic H2 evolution

Cited by in corpus (9)

• Photoanodes Based on TiO${}_2$ and $\alpha$-Fe${}_2$O${}_3$ for Solar Water Splitting Superior Role of 1D Nanoarchitectures and of Combined Heterostructures
• Photocatalysis with TiO2 Nanotubes: Colorful Reactivity and Designing Site-Specific Photocatalytic Centers into TiO2 Nanotubes
• Templated Dewetting-Alloying of NiCu Bilayers on TiO${}_2$ Nanotubes Enables Efficient Noble Metal-Free Photocatalytic $H_2$ Evolution
• Noble metals on anodic TiO2 nanotubes mouths: Thermal dewetting of minimal Pt co-catalyst loading leads to significantly enhanced photocatalytic H2 generation
• Photocatalytic H2 generation using dewetted Pt-decorated TiO2 nanotubes - Optimized dewetting and oxide crystallization by a multiple annealing process
• Nanoporous AuPt and AuPtAg alloy co-catalysts formed by dewetting-dealloying on ordered TiO2 nanotube surface lead to significantly enhanced photocatalytic H2 generation
• Aminated TiO2 nanotube as a Photoelectrochemical Water Splitting photoanode
• TiO2 nanotubes with laterally spaced ordering enable optimized hierarchical structures with significantly enhanced photocatalytic H2 generation
• Dewetted Au nanoparticles on TiO${}_2$ surfaces -- Evidence of a size-independent plasmonic photo-electrochemical response