scholarly journals CNT-ZnO Core-Shell Photoanodes for Photoelectrochemical Water Splitting

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 47
Author(s):  
Vasu Prasad Prasadam ◽  
Ali Margot Huerta Flores ◽  
Jean-Nicolas Audinot ◽  
Naoufal Bahlawane
Keyword(s):  
Water Splitting ◽  
Chemical Vapor ◽  
Atomic Layer ◽  
Photocurrent Density ◽  
Porous Coating ◽  
Core Shell ◽  
Corrosion Stability ◽  
Onset Potential ◽  
Shell Nanostructures ◽  
Photoelectrochemical Characterization

Solar-driven water splitting is a promising route toward clean H2 energy and the photoelectrochemical approach attracts a strong interest. The oxygen evolution reaction is widely accepted as the performance limiting stage in this technology, which emphasizes the need of innovative anode materials. Metal oxide semiconductors are relevant in this respect owing to their cost-effectiveness and broad availability. The combination of chemical vapor deposition and atomic layer deposition was implemented in this study for the synthesis of randomly oriented CNT-ZnO core-shell nanostructures forming an adhering porous coating. Relative to a directly coated ZnO on Si, the porous structure enables a high interface area with the electrolyte and a resulting 458% increase of the photocurrent density under simulated solar light irradiation. The photoelectrochemical characterization correlates this performance to the effective electrons withdrawing along the carbon nanotubes (CNTs), and the resulting decrease of the onset potential. In terms of durability, the CNT-ZnO core–shell structure features an enhanced photo-corrosion stability for 8 h under illumination and with a voltage bias.

One-Dimensional TiO2@GaON Core-Shell Nanowires with Controlled Shell Thickness from Atomic Layer Deposition for Stable and Efficient Photoelectrochemical Water Splitting

2019 ◽  
Author(s):  
Jiajia Tao ◽  
Hong-Ping Ma ◽  
Kaiping Yuan ◽  
Yang Gu ◽  
Jianwei Lian ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Band Gap ◽  
Water Splitting ◽  
Atomic Layer ◽  
Photoelectrochemical Water Splitting ◽  
Core Shell ◽  
Photoelectrochemical Performance ◽  
Highly Efficient ◽  
Layer Deposition ◽  
Shell Nanowires

<div>As a promising oxygen evolution reaction semiconductor, TiO2 has been extensively investigated for solar photoelectrochemical water splitting. Here, a highly efficient and stable strategy for rationally preparing GaON cocatalysts on TiO2 by atomic layer deposition is demonstrated, which we show significantly enhances the</div><div>photoelectrochemical performance compared to TiO2-based photoanodes. For TiO2@20 nm-GaON core-shell nanowires a photocurrent density up to 1.10 mA cm-2 (1.23 V vs RHE) under AM 1.5 G irradiation (100 mW cm-2) has been achieved, which is 14 times higher than that of TiO2 NWs. Furthermore, the oxygen vacancy formation on GaON as well as the band gap matching with TiO2 not only provides more active sites for water oxidation but also enhances light absorption to promote interfacial charge separation and migration. Density functional theory studies of model systems of GaON-modified TiO2 confirm the band gap reduction, high reducibility and ability to activate water. The highly efficient and stable systems of TiO2@GaON core-shell nanowires provide a deeper understanding and universal strategy for enhancing photoelectrochemical performance of photoanodes now available. </div>

Atomic layer deposition-triggered hierarchical core/shell stable bifunctional electrocatalysts for overall water splitting

2021 ◽  
Vol 9 (37) ◽  
pp. 21132-21141
Author(s):  
T. Kavinkumar ◽  
Selvaraj Seenivasan ◽  
Hyeonjung Jung ◽  
Jeong Woo Han ◽  
Do-Heyoung Kim
Keyword(s):  
Surface Modification ◽  
Atomic Layer Deposition ◽  
Water Splitting ◽  
Atomic Layer ◽  
Core Shell ◽  
Interface Engineering ◽  
Bifunctional Electrocatalyst ◽  
Overall Water Splitting ◽  
Bifunctional Electrocatalysts ◽  
Layer Deposition

A synergistic strategy of interface engineering and surface modification is efficient to construct a promising bifunctional electrocatalyst for enhanced electrocatalytic water splitting.

NiCo/NiCo–OH and NiFe/NiFe–OH core shell nanostructures for water splitting electrocatalysis at large currents

2020 ◽  
Vol 278 ◽  
pp. 119326 ◽  
Author(s):  
Weijie Zhu ◽  
Weixin Chen ◽  
Huanhuan Yu ◽  
Ye Zeng ◽  
Fangwang Ming ◽  
...  
Keyword(s):  
Water Splitting ◽  
Core Shell ◽  
Shell Nanostructures

Cu nanowires shelled with NiFe layered double hydroxide nanosheets as bifunctional electrocatalysts for overall water splitting

2017 ◽  
Vol 10 (8) ◽  
pp. 1820-1827 ◽  
Author(s):  
Luo Yu ◽  
Haiqing Zhou ◽  
Jingying Sun ◽  
Fan Qin ◽  
Fang Yu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Layered Double Hydroxide ◽  
Core Shell ◽  
Cu Nanowires ◽  
Highly Efficient ◽  
Overall Water Splitting ◽  
Shell Nanostructures ◽  
Bifunctional Electrocatalysts ◽  
Double Hydroxide

3D core–shell nanostructures of few-layer NiFe LDH nanosheets grown on Cu nanowires are fabricated toward highly efficient overall water splitting.

Toward highly radiative white light emitting nanostructures: a new approach to dislocation-eliminated GaN/InGaN core–shell nanostructures with a negligible polarization field

Nanoscale ◽  
2014 ◽  
Vol 6 (23) ◽  
pp. 14213-14220 ◽  
Author(s):  
Je-Hyung Kim ◽  
Young-Ho Ko ◽  
Jong-Hoi Cho ◽  
Su-Hyun Gong ◽  
Suk-Min Ko ◽  
...  
Keyword(s):  
Vapor Deposition ◽  
Chemical Vapor ◽  
Organic Chemical ◽  
Core Shell ◽  
Etching Technique ◽  
New Approach ◽  
Light Emitting ◽  
Shell Nanostructures ◽  
Metal Organic ◽  
Organic Chemical Vapor Deposition

Broadband visible-light emitting GaN/InGaN core–shell nanostructures were demonstrated by a dislocation-eliminating chemical vapor-phase etching technique followed by metal–organic chemical vapor deposition.

scholarly journals Positive onset potential and stability of Cu2O-based photocathodes in water splitting by atomic layer deposition of a Ga2O3buffer layer

2015 ◽  
Vol 8 (5) ◽  
pp. 1493-1500 ◽  
Author(s):  
Changli Li ◽  
Takashi Hisatomi ◽  
Osamu Watanabe ◽  
Mamiko Nakabayashi ◽  
Naoya Shibata ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Water Splitting ◽  
Energy Band ◽  
Deposition Temperature ◽  
Atomic Layer ◽  
Band Alignment ◽  
Onset Potential ◽  
Layer Deposition

The improved energy band alignment of Pt/TiO2/Ga2O3/Cu2O structure results in a positive onset potential of ∼1 Vvs.RHE and a stable cathodic photocurrent under appropriate TiO2deposition temperature.

Silver Coated Platinum Core-Shell Nanostructures on Etched Si Nanowires: Atomic Layer Deposition (ALD) Processing and Application in SERS

ChemPhysChem ◽  
2010 ◽  
pp. n/a-n/a ◽  
Author(s):  
Vladimir A. Sivakov ◽  
Katja Höflich ◽  
Michael Becker ◽  
Andreas Berger ◽  
Thomas Stelzner ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Core Shell ◽  
Si Nanowires ◽  
Shell Nanostructures ◽  
Layer Deposition

scholarly journals Direct growth of uniform carbon nitride layers with extended optical absorption towards efficient water-splitting photoanodes

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jiani Qin ◽  
Jesús Barrio ◽  
Guiming Peng ◽  
Jonathan Tzadikov ◽  
Liel Abisdris ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Water Splitting ◽  
Carbon Nitride ◽  
Photophysical Properties ◽  
Photocurrent Density ◽  
Nitride Layer ◽  
Universal Method ◽  
Intimate Contact ◽  
Faradaic Efficiency ◽  
Onset Potential

Abstract A general synthesis of carbon nitride (CN) films with extended optical absorption, excellent charge separation under illumination, and outstanding performance as a photoanode in water-splitting photoelectrochemical cells is reported. To this end, we introduced a universal method to rapidly grow CN monomers directly from a hot saturated solution on various substrates. Upon calcination, a highly uniform carbon nitride layer with tuned structural and photophysical properties and in intimate contact with the substrate is obtained. Detailed photoelectrochemical and structural studies reveal good photoresponse up to 600 nm, excellent hole extraction efficiency (up to 62%) and strong adhesion of the CN layer to the substrate. The best CN photoanode demonstrates a benchmark-setting photocurrent density of 353 µA cm−2 (51% faradaic efficiency for oxygen), and external quantum yield value above 12% at 450 nm at 1.23 V versus RHE in an alkaline solution, as well as low onset potential and good stability.

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