Preparation and enhanced photoelectrochemical performance of selenite-sensitized zinc oxide core/shell composite structure

2015 ◽  
Vol 3 (8) ◽  
pp. 4239-4247 ◽  
Author(s):  
Tiantian Hong ◽  
Zhifeng Liu ◽  
Hui Liu ◽  
Junqi Liu ◽  
Xueqi Zhang ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Ion Exchange ◽  
Chemical Synthesis ◽  
Water Splitting ◽  
Low Cost ◽  
Core Shell ◽  
Nanorod Arrays ◽  
Photoelectrochemical Performance ◽  
Vertically Aligned ◽  
Shell Composite

A fast, versatile and low-cost hydrothermal chemical synthesis based on ion-exchange has been used to deposit a shell of cupric selenite onto vertically aligned zinc oxide nanorod arrays with a buffer layer of zinc selenite for photoelectrochemical water splitting.

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>

Zinc Oxide/ Silver Sulfide (ZnO/Ag2S) Core-Shell Type Composite for Wide Range Absorption of Visible Spectra: Synthesis and Characterization

2019 ◽  
Vol 25 ◽  
pp. 84-89 ◽  
Author(s):  
Afaf Mohammad Babeer ◽  
Lubna Aamir
Keyword(s):  
Zinc Oxide ◽  
Ion Exchange ◽  
Zno Nanoparticles ◽  
Silver Sulfide ◽  
Exchange Mechanism ◽  
Core Shell ◽  
Sem Image ◽  
Wide Range ◽  
Visible Spectra ◽  
Type Composite

This work presents the synthesis of zinc oxide /silver sulfide (ZnO/Ag2S) core/shell type composite; using combined wet chemical precipitation method and ion exchange mechanism; for wide range absorption of visible spectra by the composite. Synthesis is performed in three steps. In the first step; ZnO nanoparticles (nanocores) are produced, in the second step; ZnS layer is deposited over ZnO nanocores and in the third step; Zn from ZnS is replaced by Ag to form Ag2S shell over ZnO; using ion exchange mechanism. The presence of reflection peaks of ZnO and Ag2S in XRD spectra confirms the formation of ZnO/Ag2S composite. SEM image of ZnO shows the formation of near spherical ZnO nanoparticles of diameter in range 256nm to 584nm with a smooth surface, while SEM image of ZnO/Ag2S composite shows the formation of Ag2S layer over ZnO cores as indicated by rougher and contrasted surface as compared to bare ZnO cores. Also, the size of composite particles became larger than ZnO nanocores (100µm-200µm), which further confirms the formation of Ag2S shell over ZnO nanocores. The optical absorption spectrums of both ZnO and ZnO/Ag2S composite clearly indicate that synthesized composite absorb strongly in UV to IR region of the electromagnetic spectrum as compared to ZnO nanocores; which absorb only in UV region. Therefore, the synthesized composite could be used as a photovoltaic material.

Nickel Foam Supported Co 3 O 4 @Ni 3 Se 4 Core‐Shell Nanorod Arrays with Long‐Term and Efficient Catalytic Performance for Water Splitting

ChemNanoMat ◽  
2019 ◽  
Vol 5 (6) ◽  
pp. 814-819 ◽  
Author(s):  
Ronghui Que ◽  
Gang Ji ◽  
Daoshuang Liu ◽  
Maolin Li ◽  
Sheng Liu
Keyword(s):  
Water Splitting ◽  
Nickel Foam ◽  
Catalytic Performance ◽  
Core Shell ◽  
Nanorod Arrays

Controlled synthesis of Co3O4@NiMoO4 core–shell nanorod arrays for efficient water splitting

2018 ◽  
Vol 47 (35) ◽  
pp. 12071-12074 ◽  
Author(s):  
Xiaoqiang Du ◽  
Nai Li ◽  
Xiaoshuang Zhang
Keyword(s):  
Water Splitting ◽  
Nickel Foam ◽  
Core Shell ◽  
Controlled Synthesis ◽  
Nanorod Arrays ◽  
Earth Abundant ◽  
First Time

We reported for the first time the development of Co3O4@NiMoO4 nanorod arrays on nickel foam (Co3O4@NiMoO4/NF) as a robust Earth-abundant electrocatalyst for water splitting.

Cadmium Sulphide Sensitized Crystal Facet Tailored Nanostructured Nickel Ferrite @ Hematite Core-Shell Ternary Heterojunction Photoanode for Photoelectrochemical Water Splitting

MRS Advances ◽  
2020 ◽  
Vol 5 (50) ◽  
pp. 2585-2593
Author(s):  
Soumyajit Maitra ◽  
Arundhati Sarkar ◽  
Toulik Maitra ◽  
Somoprova Halder ◽  
Subhasis Roy ◽  
...  
Keyword(s):  
Water Splitting ◽  
Cadmium Sulphide ◽  
Band Alignment ◽  
Photoelectrochemical Water Splitting ◽  
Cds Nanoparticles ◽  
Core Shell ◽  
Xenon Lamp ◽  
Photoelectrochemical Performance ◽  
Crystal Facet ◽  
Hydrothermal Approach

AbstractDesign of composite semiconductor nanostructures with proper band alignment for efficient charge separation and carrier transport has been at the center of research for photoelectrochemical water splitting. This work demonstrates the deposition of a NiFe2O4 @Fe2O3 core-shell nanostructured film sensitized with CdS to form a ternary heterojunction for cascade type electron transfer. The hematite nanostructures were grown by hydrothermal approach through dipping into a solution of Nickel Nitrate yielded anchoring of Ni2+ ions on the outer surface. The films were then annealed at 650 0C for the diffusion of Ni2+ ions into the hematite lattice which forms core-shell NiFe2O4 @Fe2O3 heterojunction. The films were further sensitized with CdS nanoparticles deposited by a hydrothermal approach to form the final ternary heterojunction photoanode. Several different nanostructures were grown and the effect of crystal facet tailoring was observed on Ni loading and photoelectrochemical performance. The photoelectrochemical measurements were carried out using a potentiostat under 100 mW/cm2 light source (150W Xenon Lamp) with Pt counter electrode and 0.5 M Na2S and 0.5 M Na2SO3 electrolyte. A current density of 3.47 mA/cm2 was observed at 1.23 V (vs Ag/AgCl). An Applied Bias to Photocurrent Efficiency (ABPE) of 1.8 % photoconversion efficiency was observed using the fabricated electrodes at 0.288V (vs Ag/AgCl).

Controllable Growth of Vertically Aligned Aluminum-Doped Zinc Oxide Nanorod Arrays by Sonicated Sol–Gel Immersion Method depending on Precursor Solution Volumes

2011 ◽  
Vol 50 (6S) ◽  
pp. 06GH04 ◽  
Author(s):  
Mohamad Hafiz Mamat ◽  
Zuraida Khusaimi ◽  
Musa Mohamed Zahidi ◽  
Suriani Abu Bakar ◽  
Yosri Mohd Siran ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Sol Gel ◽  
Precursor Solution ◽  
Nanorod Arrays ◽  
Immersion Method ◽  
Aluminum Doped Zinc Oxide ◽  
Controllable Growth ◽  
Vertically Aligned
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