Direct Chirality Recognition of Single-Crystalline and Single-Walled Transition Metal Oxide Nanotubes on Carbon Nanotube Templates

2018 ◽  
Vol 30 (44) ◽  
pp. 1803368 ◽  
Author(s):  
Boyuan Shen ◽  
Huanhuan Xie ◽  
Lin Gu ◽  
Xiao Chen ◽  
Yunxiang Bai ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Transition Metal ◽  
Metal Oxide ◽  
Transition Metal Oxide ◽  
Single Crystalline ◽  
Metal Oxide Nanotubes

Nanotubular Transition Metal Oxide for Hydrogen Production

2011 ◽  
Vol 364 ◽  
pp. 494-499 ◽  
Author(s):  
Srimala Sreekantan ◽  
E Pei San ◽  
Chin Wei Lai ◽  
Warapong Kregvirat
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Rf Sputtering ◽  
Transition Metal Oxide ◽  
Average Diameter ◽  
Ammonium Fluoride ◽  
Photocurrent Density ◽  
Electron Hole ◽  
Entire Study ◽  
Metal Oxide Nanotubes

TiO2, transition metal oxide nanotubes were successfully grown by anodizing of titanium foil (Ti) in ethylene glycol electrolyte containing 5wt % hydrogen peroxide and 5wt % ammonium fluoride for 60 minutes at 60V. It was found such electrochemical condition resulted in the formation of nanotube with average diameter of 90nm and length of 6.6 µm. These samples were used to study the effect of W loading by RF sputtering on TiO2 nanotubes. Amorphous TiO2 nanotube substrate leads to enhance incorporation of W instead of anatase. Therefore for the entire study, W was sputtered on amorphous TiO2 nanotube substrate. TiO2 nanotube sputtered below 1 minute resulted in the formation of W-O-Ti while beyond this point; it accumulates to form a self-independent structure of WO3 on the surface of the nanotubes. TiO2 nanotube sputtered for 1minute at 100W and annealed at 450°C exhibited best photocurrent density (1.4 mA/cm2) with photoconversion efficiency of 2.5%. The reason for such behavior is attributed to W6+ ions allows for electron traps that suppress electron-hole recombination and exploit the lower band gap of material to produce a water splitting process by increasing the charge separation and extending the energy range of photoexcitation for the system.

scholarly journals Enhanced oxygen evolution reaction by stacking single-crystalline freestanding SrRuO3

2021 ◽  
Author(s):  
Qixiang Wang ◽  
Huan Liu ◽  
Bin He ◽  
Ji Qi ◽  
Di Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Transition Metal ◽  
Metal Oxide ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Transition Metal Oxide ◽  
Oxide Thin Film ◽  
Strain Condition ◽  
Single Crystalline ◽  
Metal Oxide Thin Film

Abstract Transition metal oxide thin film has recently become an attractive platform for enhanced catalytic activity and to perceive the fundamental functions of d electron structure and charge transfer processes. Owing to the long-range lattice ordering and accurate stoichiometry, the single-crystalline transition metal oxide thin film enables the mechanism discussion of electrochemistry down to the atomic level. However, it is technically unviable in the fabrication of transition metal oxide thin film with a substantial surface area and strain condition. Here we report the oxygen evolution reaction enhancement by a stack of multilayer SrRuO3 featured with single-crystallinity, flexibility, and stackability, which was achieved from the rigid heterostructure via a water-dissolution of Sr3Al2O6 sacrifice interlayers. The controllable stack of multilayer SrRuO3 and the emergent high-spin state t2g(3↑)eg(1↑) of Ru efficiently enhances the oxygen evolution reaction activity. Our study provides an approach for fine manipulation of single-crystalline freestanding transition metal oxide morphologically, and an efficient strategy aiming at the extreme enhancement of the electrochemically active surface area and strain condition.

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