scholarly journals Structural effects of two-dimensional perovskite Ca2Nb2TaO10− nanosheets for photocatalytic hydrogen evolution

2016 ◽  
Vol 6 (4) ◽  
pp. 1064-1069 ◽  
Author(s):  
Kazuhiko Maeda ◽  
Miharu Eguchi
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Hydrogen Evolution ◽  
Two Dimensional ◽  
Structural Effects ◽  
Photocatalytic Hydrogen Evolution

Photocatalytic activity of restacked ACa2Nb2TaO10 (A = H, Li, Na, K, Rb, Cs) nanosheets for H2 evolution under band-gap irradiation (λ > 300 nm) was enhanced not upon hydration of the interlayer nanospace, but by protonation.

Oxygen vacancy modulation of two-dimensional γ-Ga2O3 nanosheets as efficient catalysts for photocatalytic hydrogen evolution

Nanoscale ◽  
2018 ◽  
Vol 10 (45) ◽  
pp. 21509-21517 ◽  
Author(s):  
Xiaoyan Zhang ◽  
Zizhong Zhang ◽  
Huijuan Huang ◽  
Ying Wang ◽  
Na Tong ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancy ◽  
Hydrogen Evolution ◽  
Two Dimensional ◽  
Photocatalytic Hydrogen Evolution ◽  
Vacancy Concentrations

γ-Ga2O3 nanosheets with different thicknesses and oxygen vacancy concentrations were fabricated to study their effects on photocatalytic activity.

Photocatalytic Hydrogen Evolution over Pt/Co-TiO2 Photocatalysts

2020 ◽  
Vol 01 ◽  
Author(s):  
S. Akel ◽  
R. Dillert ◽  
D.W. Bahnemann
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Hydrogen Evolution ◽  
Molecular Hydrogen ◽  
Hydrogen Generation ◽  
Solar Light ◽  
Tio2 Photocatalysts ◽  
Photocatalytic Hydrogen Evolution ◽  
Doped Tio2 ◽  
Simulated Solar Light

Aims: cobalt doped TiO2 composites were synthesized with the aim to decrease the TiO2 band gap which results in enhanced visible absorption and then loaded with 1 wt.% of platinum for promoting the formation of molecular hydrogen. Background: Controversial results of the cobalt-based compounds create doubts about the photocatalytic activity of the cobalt doped TiO2 materials. Thus, cobalt doped TiO2 composites were synthesized, and the photocatalytic activity was checked for the hydrogen generation. Objective: The objective of this study is the synthesis of photocatalysts that are highly active for the photocatalytic hydrogen evolution. Methods: The TiO2 and Co-TiO2 photocatalysts were synthesized using two different methods that are reflux and hydrothermal synthesis. Additionally, The Pt deposition on the prepared TiO2 and Co-TiO2 catalysts (1 wt.% Pt) was performed by the photoplatinization method. Result: The results showed that the reduction of protons over bare TiO2 and Co-TiO2 materials is possible from the thermodynamic point of view. The evolution of molecular hydrogen from aqueous methanol employing 1 wt.% platinum loaded on 0.5 wt.% Co-TiO2 photocatalysts under simulated solar light irradiation was investigated. The platinized CoTiO2 composites along with the platinized TiO2 samples have shown high photocatalytic hydrogen evolution. Higher hydrogen evolution rates were determined in the presence of all platinized materials, and a maximum of 317 μmol h-1 is observed on a Pt/Co-TiO2 photocatalyst prepared by a hydrothermal method. Conclusion: EPR results confirmed that the defects observed in the sample prepared within the hydrothermal processing were in the surface and have better crystallinity, while the defects detected on the samples prepared by reflux synthesis were less crystalline. The nature of semiconductor materials was explored through the determination of the flatband potential using the Mott–Schottky equation. The Mott−Schottky analysis of electrochemical impedance measurements showed that all semiconductors were n-type semiconductors and that cobalt doping induces impurity level within the band gap of TiO2. The experimental results of photocatalytic hydrogen generation from methanol-reforming showed that the Co- doping does not affect the photocatalytic activity of both Pt/Co-TiO2 catalysts. Despite that, the Pt/Co-TiO2-HT was the best photocatalyst under simulated solar light and show a maximum hydrogen evolution rate of 317 ± 44 μmol h-1. Other: Based on the experimental results, a possible mechanism for the continuous photocatalytic activity of Pt/Co-TiO2 photocatalysts under simulated solar light is proposed.

Cobalt ion redox and conductive polymers boosted the photocatalytic activity of the graphite carbon nitride–Co3O4 Z-scheme heterostructure

2021 ◽  
Vol 45 (1) ◽  
pp. 162-168
Author(s):  
Tao Li ◽  
Jiandong Cui ◽  
Yezhan Lin ◽  
Kecheng Liu ◽  
Rui Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Hydrogen Evolution ◽  
Carbon Nitride ◽  
Conductive Polymers ◽  
Cobalt Ion ◽  
Photocatalytic Hydrogen Evolution ◽  
Conductive Polyaniline

The enhanced photocatalytic hydrogen evolution performance of g-C3N4–Co3O4 2D–1D Z-scheme heterojunctions was achieved through the synergistic effect of the cobalt ion redox, conductive polyaniline, and a Co3O4 nanobelt.

Layer-dependent photocatalysts of GaN/SiC-based multilayer van der Waals heterojunctions for Hydrogen Evolution

2021 ◽  
Author(s):  
Bojun Peng ◽  
Liang Xu ◽  
Jian Zeng ◽  
Xiaopeng Qi ◽  
Youwen Yang ◽  
...  
Keyword(s):  
Band Gap ◽  
Hydrogen Evolution ◽  
High Performance ◽  
Van Der Waals ◽  
Environmentally Friendly ◽  
Wide Band ◽  
Two Dimensional ◽  
Wide Band Gap ◽  
Van Der Waals Heterostructures ◽  
Composite Photocatalysts

The development of non-precious, high-performance and environmentally friendly wide band gap semiconductor composite photocatalysts is highly desirable. Here we report two-dimensional (2D) GaN/SiC-based multilayer van der Waals heterostructures for hydrogen...

Fabrication of two-dimensional Ni2P/ZnIn2S4 heterostructures for enhanced photocatalytic hydrogen evolution

2018 ◽  
Vol 353 ◽  
pp. 15-24 ◽  
Author(s):  
Xu-li Li ◽  
Xiao-jing Wang ◽  
Jia-yu Zhu ◽  
Yu-pei Li ◽  
Jun Zhao ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Two Dimensional ◽  
Photocatalytic Hydrogen Evolution

scholarly journals Conjugated Polymer Donor-Molecular Acceptor Nanohybrids for Photocatalytic Hydrogen Evolution

2019 ◽  
Author(s):  
Haofan Yang ◽  
Xiaobo Li ◽  
Reiner Sebastian Sprick ◽  
Andrew I. Cooper
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Conjugated Polymers ◽  
Hydrogen Evolution ◽  
Conjugated Polymer ◽  
Apparent Quantum Yield ◽  
High Hydrogen ◽  
Photocatalytic Hydrogen Evolution ◽  
Efficient Charge ◽  
Donor Acceptor

A library of 237 organic binary/ternary nanohybrids consisting of conjugated polymers donors and both fullerene and non-fullerene molecular acceptors was prepared and screened for sacrificial photocatalytic hydrogen evolution. These donor-acceptor nanohybrids (DANHs) showed significantly enhanced hydrogen evolution rates compared with the parent donor or acceptor compounds. DANHs of <a></a><a>a polycarbazole</a>-based donor combined with a methanofullerene acceptor (PCDTBT/PC<sub>60</sub>BM) showed a high hydrogen evolution rate of 105.2 mmol g<sup>-1</sup> h<sup>-1</sup> under visible light (λ > 420 nm). This DANH photocatalyst produced 5.9 times more hydrogen than a sulfone-containing polymer (P10) under the same conditions, which is one of the most efficient organic photocatalysts reported so far. An apparent quantum yield of hydrogen evolution of 3.0 % at 595 nm was measured for this DANH. The photocatalytic activity of the DANHs, which in optimized cases reached 179.0 mmol g<sup>-1</sup> h<sup>-1</sup>, is attributed to efficient charge transfer at the polymer donor/molecular acceptor interface. We also show that ternary donor<sub>A</sub>-donor<sub>B</sub>-acceptor nanohybrids can give higher activities than binary donor-acceptor hybrids in some cases.

Fabrication of selective interface of ZnO/CdS heterostructures for more efficient photocatalytic hydrogen evolution

2018 ◽  
Vol 47 (35) ◽  
pp. 12162-12171 ◽  
Author(s):  
Xinlong Ma ◽  
Fei Zhao ◽  
Qinping Qiang ◽  
Tongyao Liu ◽  
Yuhua Wang
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Photocatalytic Hydrogen Evolution

Selective interface in ZnO/CdS heterostructure promote the photocatalytic activity.

Hydrogenated ZnIn2S4 microspheres: boosting photocatalytic hydrogen evolution by sulfur vacancy engineering and mechanism insight

2019 ◽  
Vol 21 (45) ◽  
pp. 25484-25494 ◽  
Author(s):  
Yanze Wang ◽  
Da Chen ◽  
Laishun Qin ◽  
Junhui Liang ◽  
Yuexiang Huang
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Sulfur Vacancy ◽  
Photocatalytic Hydrogen Evolution

The correlation between hydrogenation-induced surface sulfur vacancies and photocatalytic activity of hydrogenated ZnIn2S4 is tentatively proposed in this work.

Two-dimensional carbon nitride-based composites for photocatalytic hydrogen evolution

2019 ◽  
Vol 44 (59) ◽  
pp. 30935-30948 ◽  
Author(s):  
Shengnan Tang ◽  
Yong Zhu ◽  
Huaming Li ◽  
Hui Xu ◽  
Shouqi Yuan
Keyword(s):  
Hydrogen Evolution ◽  
Carbon Nitride ◽  
Two Dimensional ◽  
Photocatalytic Hydrogen Evolution
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