Researchers prove titanate nanotubes composites enhance photocatalysis of hydrogen

October 27, 2020

In a paper published in NANO, researchers from National Taiwan University examined the photocatalytic performances of titanate nanotubes (TNTs) against commonly-used titanium dioxide (TiO2) and discovered superior performance of TNTs.

In the study, TiO2 was used as a reference support compared with TNTs synthesized by a facile method. The results showed that Platinum (Pt/)TNTs fabricated using the microwave heating process enhanced the hydrogen evolution from methanol to a greater extent than Pt/TiO2. The high surface area of TNTs can improve adsorption of methanol on the active site and prevent the formation of agglomerated fine Pt particles.

Additionally, the high surface area led to an increased contact area between Pt and Ti atoms, which enhanced the strong metal-support interaction and increased H2 production performance. This is due to the absorption spectra of TNTs shifting toward the visible light region to a greater extent after loading Pt, thereby improving the selectivity of formic acid decomposition to CO2. Therefore, Pt/TNTs, which have considerably high photocatalytic efficiency, are viable in further applications as promising photocatalysts.

The titanate nanotubes (TNTs) composites enhanced the photocatalytic selectivity for H2 generation from formic acid better than Pt/TiO2. In addition, intensified electronic interactions occur between the components of TNTs and the Pt atoms in terms of the strong metal-support interaction, consequently influencing the behavior of photocatalysts. Therefore, the photocatalyst formed by Pt and TNTs has higher photocatalytic performance than TiO2 from a 20% v/v methanol solution under UV and visible light irradiation.

TNTs offer higher active surface area than TiO2 nanoparticles. The high surface area provides short diffusion paths for electrons and holes, prompting them to transfer to the surface and reducing the recombination of electrons and holes. Also, X-ray Photoelectron Spectroscopy (XPS) results of the paper showed negative shifts of the Pt binding energies and positive shifts of Ti binding energies due to the strong metal-support interaction between Pt and TNTs. Thus, the remarkably high photocatalytic efficiency of TNT composites facilitates their application as promising photocatalysts.

Besides, it is worth noting that one mole of HCOOH decomposes into one mole of CO2 and one mole of H2, or one mole of CO and one mole of H2O. Thus, it is important to increase the selectivity of formic acid decomposition for CO2 evolution. The results show bare TNTs and Pt/TNTs resulted in lower CO generation than bare TiO2 and Pt/TiO2. This result may be attributed to the inability of CO to diffuse into the pores of TNTs because of the diameter difference, because the kinetic diameter of CO (0.38 nm) is larger than that of CO2 (0.33 nm).

Will the different structure of the photocatalyst promote the photocatalytic selectivity of formic acid to H2? The researchers prove tubular TNTs composites enhanced the photocatalytic hydrogen generation better than TiO2.
-end-
Corresponding author for this study is Shang-Lien Lo, sllo@ntu.edu.tw.

For more insight into the research described, readers are invited to access the paper on NANO.

IMAGE

Caption: The titanate nanotubes (TNTs) composites enhanced the photocatalytic selectivity for H2 generation from formic acid better than Pt/TiO2. In addition, intensified electronic interactions occur between the components of TNTs and the Pt atoms in terms of the strong metal-support interaction, consequently influencing the behavior of photocatalysts. Therefore, the photocatalyst formed by Pt and TNTs has higher photocatalytic performance than TiO2 from a 20% v/v methanol solution under UV and visible light irradiation.

Please contact Hsiu-Yu Chen, d98541007@ntu.edu.tw for usage restrictions.

NANO is an international peer-reviewed monthly journal for nanoscience and nanotechnology that presents forefront fundamental research and new emerging topics. It features timely scientific reports of new results and technical breakthroughs and publishes interesting review articles about recent hot issues.

About World Scientific Publishing Co.

World Scientific Publishing is a leading independent publisher of books and journals for the scholarly, research, professional and educational communities. The company publishes about 600 books annually and about 140 journals in various fields. World Scientific collaborates with prestigious organizations like the Nobel Foundation and US National Academies Press to bring high quality academic and professional content to researchers and academics worldwide. To find out more about World Scientific, please visit http://www.worldscientific.com.

For more information, contact Tay Yu Shan at ystay@wspc.com.

World Scientific

Related Surface Articles from Brightsurf:

3D printing the first ever biomimetic tongue surface
Scientists have created synthetic soft surfaces with tongue-like textures for the first time using 3D printing, opening new possibilities for testing oral processing properties of food, nutritional technologies, pharmaceutics and dry mouth therapies.

Surface waves can help nanostructured devices keep their cool
A research team led by The Institute of Industrial Science, The University of Tokyo demonstrated that hybrid surface waves called surface phonon-polaritons provide enhanced thermal conductivity in nanoscale membranes.

A novel salvinia-like slippery surface
Inspired by the hydrophobic leaves of Salvinia molesta and the slippery Nepenthes pitcher plants, a Salvinia-like slippery surface (SSS) consisting of protrusions with slippery heads was designed.

Illuminating cell surface receptors
Human cells sense and communicate via cell surface receptors on their surface.

Tuning the surface gives variations to metal foils
IBS researchers reported how to give variations to single crystalline metal foils.

Division of labour on the surface of bacteria
Bacteria of the species Thermus thermophilus possess two types of extensions on their surface (pili) for the purpose of motion and for capturing and absorbing DNA from their environment.

Changes in surface sugarlike molecules help cancer metastasize
Changes in a specific type of sugarlike molecule, or glycan, on the surface of cancer cells help them to spread into other tissues, according to researchers at UC Davis.

Journalism is an 'attack surface' for those who spread misinformation
For all the benefits in the expansion of the media landscape, we're still struggling with the spread of misinformation -- and the damage is especially worrisome when it comes to information about science and health.

Finding connections at the surface
How and where receptors touch at the surface of a cell may influence the strength of neuronal connections and contribute to identifying better medical interventions for pain, cancer other diseases.

A self-cleaning surface that repels even the deadliest superbugs
A team of researchers at McMaster University has developed a self-cleaning surface that can repel all forms of bacteria, preventing the transfer of antibiotic-resistant superbugs and other dangerous bacteria in settings ranging from hospitals to kitchens.

Read More: Surface News and Surface Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.