scholarly journals Morphological and Elemental Investigations on Co–Fe–B–O Thin Films Deposited by Pulsed Laser Deposition for Alkaline Water Oxidation: Charge Exchange Efficiency as the Prevailing Factor in Comparison with the Adsorption Process

2021 ◽  
Author(s):  
Y. Popat ◽  
M. Orlandi ◽  
S. Gupta ◽  
N. Bazzanella ◽  
S. Pillai ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Water Oxidation ◽  
Active Sites ◽  
High Surface ◽  
Pulsed Laser ◽  
Industrial Applications ◽  
Active Species ◽  
Laser Deposition ◽  
Core Shell ◽  
Adsorption Sites

Abstract Mixed transition-metals oxide electrocatalysts have shown huge potential for electrochemical water oxidation due to their earth abundance, low cost and excellent electrocatalytic activity. Here we present Co–Fe–B–O coatings as oxygen evolution catalyst synthesized by Pulsed Laser Deposition (PLD) which provided flexibility to investigate the effect of morphology and structural transformation on the catalytic activity. As an unusual behaviour, nanomorphology of 3D-urchin-like particles assembled with crystallized CoFe2O4 nanowires, acquiring high surface area, displayed inferior performance as compared to core–shell particles with partially crystalline shell containing boron. The best electrochemical activity towards water oxidation in alkaline medium with an overpotential of 315 mV at 10 mA/cm2 along with a Tafel slope of 31.5 mV/dec was recorded with core–shell particle morphology. Systematic comparison with control samples highlighted the role of all the elements, with Co being the active element, boron prevents the complete oxidation of Co to form Co3+ active species (CoOOH), while Fe assists in reducing Co3+ to Co2+ so that these species are regenerated in the successive cycles. Thorough observation of results also indicates that the activity of the active sites play a dominating role in determining the performance of the electrocatalyst over the number of adsorption sites. The synthesized Co–Fe–B–O coatings displayed good stability and recyclability thereby showcasing potential for industrial applications. Graphic Abstract

Impact of lattice defects on water oxidation properties in SnNb2O6 photoanode prepared by pulsed-laser deposition method

2019 ◽  
Vol 126 (9) ◽  
pp. 094901
Author(s):  
Hiroki Matsuo ◽  
Masao Katayama ◽  
Tsutomu Minegishi ◽  
Taro Yamada ◽  
Akihiko Kudo ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Water Oxidation ◽  
Pulsed Laser ◽  
Lattice Defects ◽  
Laser Deposition ◽  
Deposition Method ◽  
Oxidation Properties

Pulsed-Laser Deposition of Nanostructured Iron Oxide Catalysts for Efficient Water Oxidation

2014 ◽  
Vol 6 (9) ◽  
pp. 6186-6190 ◽  
Author(s):  
Michele Orlandi ◽  
Stefano Caramori ◽  
Federico Ronconi ◽  
Carlo A. Bignozzi ◽  
Zakaria El Koura ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Pulsed Laser Deposition ◽  
Water Oxidation ◽  
Pulsed Laser ◽  
Oxide Catalysts ◽  
Laser Deposition

Pulsed Laser Deposition in a Zinc Alloy Corrosion Study

2003 ◽  
Vol 780 ◽  
Author(s):  
R. Guerrero-Penalva ◽  
M.H. Farías ◽  
L. Cota-Araiza
Keyword(s):  
Pulsed Laser Deposition ◽  
Photoelectron Spectroscopy ◽  
Active Sites ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Reactive Element ◽  
General Mechanism ◽  
Zinc Alloy ◽  
Reactive Element Effect ◽  
X Ray

AbstractA significant improvement in corrosion resistance of the protecting oxide of alloys has been observed when adding small amounts of reactive elements, such as yttrium, this effect has been called reactive element effect (REE). The general mechanism of the REE has not been determined yet. In this work, we study a growing of a yttrium oxide film and its interaction with the phases η and α that constitutes the alloy Zn-22Al-2Cu named ZinalcoTM The alloy's surface was coated by a pulsed laser deposition technique. The deposit is controlled and characterized by x-ray photoelectron spectroscopy. The mechanism by which the reactive element produce its effects in this alloy is explained by the preferential interaction among the active sites related to the zinc rich phase and enhancing aluminum movement toward the surface where it is oxidized and the protection film formed.

Effect of energy, temperature, and Cu-doped coatings on crystallinity of Hydroxyapatite thin films obtained by pulsed laser deposition

2021 ◽  
Author(s):  
Nooshin Kashi ◽  
Mahdi Momeni ◽  
Habib Hamidinezhad
Keyword(s):  
Pulsed Laser Deposition ◽  
Laser Energy ◽  
High Surface ◽  
Pulsed Laser ◽  
Xrd Analysis ◽  
Laser Deposition ◽  
Laser Source ◽  
X Ray Diffraction ◽  
Crystalline Films ◽  
Steel Substrates

In this work, a pulsed laser deposition (PLD) technique with an Nd:YAG laser source was used to produce pure Hydroxyapatite (HA) and Cu-substituted HA (Cu-HA) coatings on stainless steel substrates in vacuum at room temperature. It is observed that the combined effects of percentages of Cu dopants and laser energy as well as annealing temperature significantly modify the crystallinity of the films. The morphology and structural properties of the deposited HA films were analyzed by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and Raman spectroscopy. FESEM images displayed various shapes of nanoparticles with high-surface density throughout the area of the substrate and with typical sizes around 26–208 nm. XRD analysis confirmed that post-deposition annealing is essential to achieve the desired crystallinity and uniformity of coatings. The Raman spectrum of HA has peaks at 958.22, 437.48, and 587.05 cm[Formula: see text] attributed to the [Formula: see text] PO[Formula: see text], [Formula: see text] PO[Formula: see text], and [Formula: see text] PO[Formula: see text], respectively. The synthesized HA and Cu-HA crystalline films are nanostructures with dense and compact microstructures. Finally, irregular surface and crystalline structure of fabricated films lead to the extension of the surface and enhance the cell’s proliferation in medical uses and biomedical applications.

scholarly journals Structural and optical properties of Zn0.9Mn0.1O/ZnO core-shell nanowires designed by pulsed laser deposition

2009 ◽  
Vol 106 (9) ◽  
pp. 093501 ◽  
Author(s):  
V. E. Kaydashev ◽  
E. M. Kaidashev ◽  
M. Peres ◽  
T. Monteiro ◽  
M. R. Correia ◽  
...  
Keyword(s):  
Optical Properties ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Core Shell ◽  
Structural And Optical Properties ◽  
Shell Nanowires
Sign in / Sign up

Export Citation Format

Share Document