scholarly journals Self-Standing 3D Core–Shell Nanohybrids Based on Amorphous Co–Fe–Bi Nanosheets Grafted on NiCo2O4 Nanowires for Efficient and Durable Water Oxidation

2020 ◽  
Vol 3 (5) ◽  
pp. 4338-4347 ◽  
Author(s):  
Umesh P. Suryawanshi ◽  
Mahesh P. Suryawanshi ◽  
Uma V. Ghorpade ◽  
Mingrui He ◽  
Dongmin Lee ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Core Shell

Water Oxidation Catalysis by Birnessite@Iron Oxide Core–Shell Nanocomposites

2015 ◽  
Vol 54 (6) ◽  
pp. 2734-2741 ◽  
Author(s):  
Gökhan Elmaci ◽  
Carolin E. Frey ◽  
Philipp Kurz ◽  
Birgül Zümreoğlu-Karan
Keyword(s):  
Iron Oxide ◽  
Water Oxidation ◽  
Oxidation Catalysis ◽  
Core Shell ◽  
Water Oxidation Catalysis ◽  
Iron Oxide Core

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

3D Core–Shell NiFeCr Catalyst on a Cu Nanoarray for Water Oxidation: Synergy between Structural and Electronic Modulation

2018 ◽  
Vol 3 (12) ◽  
pp. 2865-2874 ◽  
Author(s):  
Lizhou Fan ◽  
Peili Zhang ◽  
Biaobiao Zhang ◽  
Quentin Daniel ◽  
Brian J.J. Timmer ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Core Shell

Amorphous NiFe layered double hydroxide nanosheets decorated on 3D nickel phosphide nanoarrays: a hierarchical core–shell electrocatalyst for efficient oxygen evolution

2018 ◽  
Vol 6 (28) ◽  
pp. 13619-13623 ◽  
Author(s):  
Luo Yu ◽  
Haiqing Zhou ◽  
Jingying Sun ◽  
Ishwar Kumar Mishra ◽  
Dan Luo ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Layered Double Hydroxide ◽  
Water Oxidation ◽  
Core Shell ◽  
Nickel Phosphide ◽  
Double Hydroxide

Amorphous NiFe LDH nanosheets were decorated on nickel phosphide nanoarrays to form a 3D core–shell electrocatalyst for efficient water oxidation.

Ferromagnetic–Antiferromagnetic Coupling Core–Shell Nanoparticles with Spin Conservation for Water Oxidation

2021 ◽  
Author(s):  
Jingjie Ge ◽  
Riccardo Ruixi Chen ◽  
Xiao Ren ◽  
Xia Li ◽  
Jiawei Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Transport ◽  
Domain Structure ◽  
Applied Magnetic Field ◽  
Water Oxidation ◽  
Rational Design ◽  
Critical Role ◽  
Antiferromagnetic Coupling ◽  
Core Shell ◽  
Multiple Domain

<p>Rational design of active oxygen evolution reaction (OER) catalysts is critical for the overall efficiency of water electrolysis. OER reactants and products’ differing spin states is one of causes to slow OER kinetics. Thus, spin conservation plays a crucial role in enhancing OER performance. In this work, we design ferromagnetic (FM)–antiferromagnetic (AFM) Fe<sub>3</sub>O<sub>4</sub>@Ni(OH)<sub>2</sub> core–shell catalysts. The interfacial FM–AFM coupling of these catalysts facilitates selective removal of electrons with spin direction opposing the magnetic moment of FM core, improving OER kinetics. The shell thickness is found critical in retaining the coupling effect for OER enhancement. The magnetic domain structure of the FM core also plays a critical role. With a multiple domain core, the applied magnetic field aligns the magnetic domains, optimising the electron transport process. A significant enhancement of OER activity is observed for the multiple domain core catalysts. With a single domain FM core with ordered magnetic dipoles, the spin-selective electron transport with minimal scattering is facilitated even without an applied magnetic field. We therefore draw a magnetism/OER activity model that depends on two main parameters: interfacial spin coupling and domain structure. Our findings provide new design principles for active OER catalysts.</p>

Reducing the surface recombination during light-driven water oxidation by core-shell BiVO4@Ni:FeOOH

2019 ◽  
Vol 300 ◽  
pp. 77-84 ◽  
Author(s):  
Xiaofan Zhang ◽  
Hao Li ◽  
Weiqian Kong ◽  
Huili Liu ◽  
Hongbo Fan ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Surface Recombination ◽  
Core Shell

Efficient Co@CoO core-shell nanocrystals as catalysts for visible-light-driven water oxidation

2017 ◽  
Vol 210 ◽  
pp. 67-76 ◽  
Author(s):  
Zheng Wan ◽  
Qian Xu ◽  
Hui Li ◽  
Yi Zhang ◽  
Yong Ding ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Oxidation ◽  
Core Shell ◽  
Visible Light Driven
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