Atomic Layer Deposition of ZnO on TiO2 Nanofibers for Boosted Photocatalytic Hydrogen Production

2020 ◽  
Author(s):  
Kaihe Zhou ◽  
Peng Li ◽  
Yanwei Zhu ◽  
Xiaming Ye ◽  
Huazhi Chen ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Tio2 Nanofibers ◽  
Photocatalytic Hydrogen Production ◽  
Layer Deposition

An ultrathin Al2O3 bridging layer between CdS and ZnO boosts photocatalytic hydrogen production

2020 ◽  
Vol 8 (21) ◽  
pp. 11031-11042 ◽  
Author(s):  
Dandan Ma ◽  
Zhenyu Wang ◽  
Jian-Wen Shi ◽  
Yajun Zou ◽  
Yixuan Lv ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Evolution Rate ◽  
Deposition Method ◽  
Photocatalytic Hydrogen Production ◽  
Layer Deposition ◽  
Atomic Layer Deposition Method

An ultrathin Al2O3 bridging layer is intentionally introduced into the interface between CdS and ZnO by using an atomic layer deposition method, and the resultant CdS@Al2O3@ZnO catalyst exhibits a significantly enhanced H2 evolution rate.

scholarly journals Dual promotional effect of CuxO clusters grown with atomic layer deposition on TiO2 for photocatalytic hydrogen production

2021 ◽  
Author(s):  
Saeed Saedy ◽  
Nico Hiemstra ◽  
Dominik Benz ◽  
Hao van Bui ◽  
Michael Nolan ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Atomic Layer Deposition ◽  
Density Functional ◽  
Atomic Layer ◽  
Active Area ◽  
Content Increase ◽  
Tio2 Photocatalysts ◽  
Photocatalytic Hydrogen Production ◽  
Promotional Effect ◽  
Layer Deposition

The promotional effects on photocatalytic hydrogen production of CuxO clusters deposited using atomic layer deposition (ALD) on P25 TiO2 are presented. The structural and surface chemistry study of CuxO/TiO2 samples, along with first principles Density Functional Theory simulations, reveal the strong interaction of ALD deposited CuxO with TiO2, leading to the stabilization of CuxO clusters on the surface; it also demonstrated substantial reduction of Ti4+ to Ti3+ on the surface of CuxO/TiO2 samples after CuxO ALD. The CuxO/TiO2 photocatalysts showed remarkable improvement in hydrogen productivity, with 11 times greater hydrogen production for the optimum sample compared to unmodified P25. With the combination of the hydrogen production data and characterization of CuxO/TiO2 photocatalysts, we inferred that ALD deposited CuxO clusters have a dual promotional effect: increased charge carrier separation and improved light absorption, consistent with known copper promoted TiO2 photocatalysts and generation of a substantial amount of surface Ti3+ which results in self-doping of TiO2 and improves its photo-activity for hydrogen production. The obtained data were also employed to modify the previously proposed expanding photocatalytic area and overlap model to describe the effect of cocatalyst size and weight loading on photocatalyst activity. Comparing the trend of surface Ti3+ content increase and the photocatalytically promoted area, calculated with our model, suggests that the depletion zone formed around the heterojunction of CuxO-TiO2 is the main active area for hydrogen production, and the hydrogen productivity of the photocatalyst depends on the surface coverage by this active area. However, the overlap of these areas initiates the deactivation of the photocatalyst.

Hydrogen Production via Chemical Looping Redox Cycles Using Atomic Layer Deposition-Synthesized Iron Oxide and Cobalt Ferrites

2011 ◽  
Vol 23 (8) ◽  
pp. 2030-2038 ◽  
Author(s):  
Jonathan R. Scheffe ◽  
Mark D. Allendorf ◽  
Eric N. Coker ◽  
Benjamin W. Jacobs ◽  
Anthony H. McDaniel ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Hydrogen Production ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Chemical Looping ◽  
Redox Cycles ◽  
Cobalt Ferrites ◽  
Layer Deposition

scholarly journals Photocatalytic Crystalline and Amorphous TiO2 Nanotubes Prepared by Electrospinning and Atomic Layer Deposition

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5917
Author(s):  
Orsolya Kéri ◽  
Eszter Kocsis ◽  
Dániel Attila Karajz ◽  
Zsombor Kristóf Nagy ◽  
Bence Parditka ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Tio2 Nanotubes ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Atomic Layer ◽  
Poly Vinyl Alcohol ◽  
Tio2 Nanofibers ◽  
Layer Deposition ◽  
Amorphous Tio2 ◽  
Shell Composite

In this work core/shell composite polymer/TiO2 nanofibers and from those TiO2 nanotubes were prepared. First, poly(vinyl alcohol) (PVA) and poly(vinylpyrrolidone) (PVP) fibers were synthetized by electrospinning. They were covered with a 100 nm thick amorphous TiO2 layer by atomic layer deposition at 50 °C. Later the polymer core was removed by two different methods: dissolution and annealing. In the case of dissolution in water, the as-prepared TiO2 nanotubes remained amorphous, while when annealing was used to remove the polymers, the TiO2 crystallized in anatase form. Due to this, the properties of amorphous and crystalline TiO2 nanotubes with exactly the same structure and morphology could be compared. The samples were investigated by SEM-EDX, ATR-IR, UV-Vis, XRD and TG/DTA-MS. Finally, the photocatalytic properties of the TiO2 nanotubes were studied by decomposing methyl-orange dye under UV light. According to the results, crystalline anatase TiO2 nanotubes reached the photocatalytic performance of P25, while amorphous TiO2 nanotubes had observable photocatalytic activity.

Self-terminated electrodeposition of iridium electrocatalysts

2015 ◽  
Vol 8 (12) ◽  
pp. 3557-3562 ◽  
Author(s):  
Sang Hyun Ahn ◽  
Haiyan Tan ◽  
Mareike Haensch ◽  
Yihua Liu ◽  
Leonid A. Bendersky ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Atomic Layer Deposition ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Oxidation Reaction ◽  
Atomic Layer ◽  
Deposition Process ◽  
Atomic Layer Deposition Process ◽  
Layer Deposition

This study details a “wet” atomic layer deposition process that uses potential modulation and H adsorption to terminate Ir deposition at high deposition overpotentials. The ultrathin Ir films match or exceed the best reported electrocatalytic activity for the oxygen evolution reaction (OER) and hydrogen production and oxidation reaction (HER and HOR) on bulk Ir electrodes.

Application of Atomic Layer Deposition in Dye-Sensitized Photoelectrosynthesis Cells

2021 ◽  
Vol 3 (1) ◽  
pp. 59-71
Author(s):  
Degao Wang ◽  
Qing Huang ◽  
Weiqun Shi ◽  
Wei You ◽  
Thomas J. Meyer
Keyword(s):  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Dye Sensitized ◽  
Layer Deposition
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