Photocatalytic hydrogen evolution with ruthenium polypyridine sensitizers: unveiling the key factors to improve efficiencies

2016 ◽  
Vol 45 (22) ◽  
pp. 9136-9147 ◽  
Author(s):  
Elisa Deponti ◽  
Mirco Natali
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Generation ◽  
Ruthenium Complexes ◽  
Key Factors ◽  
Photocatalytic Hydrogen Evolution ◽  
Ruthenium Polypyridine

An alternative benchmark sensitizer for photochemical hydrogen generation is identified within a series of ruthenium complexes, capable of outperforming the standard Ru(bpy)32+.

scholarly journals Few-layered CuInP2S6 nanosheet with sulfur vacancy boosting photocatalytic hydrogen evolution

CrystEngComm ◽  
2021 ◽  
Author(s):  
Peng Yu ◽  
Fengmei Wang ◽  
Jun Meng ◽  
Tofik Ahmed Shifa ◽  
Marshet Getaye Sendeku ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Generation ◽  
Sulfur Vacancy ◽  
Photocatalytic Hydrogen Evolution ◽  
Photocatalytic Hydrogen Generation

Uniform few-layered CuInP2S6 nanosheets and microsheets were initially synthesized and utilized as photocatalysts towards photocatalytic hydrogen generation.

Ruthenium(iii)-bis(phenolato)bipyridine/TiO2 hybrids: unprecedented photocatalytic hydrogen evolution

2019 ◽  
Vol 48 (27) ◽  
pp. 10070-10077 ◽  
Author(s):  
Binitendra Naath Mongal ◽  
Amritanjali Tiwari ◽  
Chandrasekharam Malapaka ◽  
Ujjwal Pal
Keyword(s):  
Hydrogen Evolution ◽  
Ruthenium Complexes ◽  
Photocatalytic Hydrogen Evolution

Bis-(hydroxyphenyl) bipyridine-based ruthenium complexes as photosensitizers for efficient photocatalytic H2 evolution.

scholarly journals Rational design of isostructural 2D porphyrin-based covalent organic frameworks for tunable photocatalytic hydrogen evolution

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rufan Chen ◽  
Yang Wang ◽  
Yuan Ma ◽  
Arindam Mal ◽  
Xiao-Ya Gao ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Rational Design ◽  
Hydrogen Generation ◽  
Structure Design ◽  
Molecular Engineering ◽  
Valuable Insight ◽  
Covalent Organic Frameworks ◽  
Structure Property ◽  
Photocatalytic Hydrogen Evolution ◽  
Photocatalytic Hydrogen Generation

AbstractCovalent organic frameworks have recently gained increasing attention in photocatalytic hydrogen generation from water. However, their structure-property-activity relationship, which should be beneficial for the structural design, is still far-away explored. Herein, we report the designed synthesis of four isostructural porphyrinic two-dimensional covalent organic frameworks (MPor-DETH-COF, M = H2, Co, Ni, Zn) and their photocatalytic activity in hydrogen generation. Our results clearly show that all four covalent organic frameworks adopt AA stacking structures, with high crystallinity and large surface area. Interestingly, the incorporation of different transition metals into the porphyrin rings can rationally tune the photocatalytic hydrogen evolution rate of corresponding covalent organic frameworks, with the order of CoPor-DETH-COF < H2Por-DETH-COF < NiPor-DETH-COF < ZnPor-DETH-COF. Based on the detailed experiments and calculations, this tunable performance can be mainly explained by their tailored charge-carrier dynamics via molecular engineering. This study not only represents a simple and effective way for efficient tuning of the photocatalytic hydrogen evolution activities of covalent organic frameworks at molecular level, but also provides valuable insight on the structure design of covalent organic frameworks for better photocatalysis.

Over two-orders of magnitude enhancement of the photocatalytic hydrogen evolution activity of carbon nitride via mediator-free decoration with gold-organic microspheres

2017 ◽  
Vol 53 (86) ◽  
pp. 11814-11817 ◽  
Author(s):  
Qiaoli Zhang ◽  
Shengyang Yang ◽  
Su-Na Yin ◽  
Huaiguo Xue
Keyword(s):  
Hydrogen Evolution ◽  
Carbon Nitride ◽  
Hydrogen Generation ◽  
Photocatalytic Hydrogen Evolution ◽  
Photocatalytic Hydrogen Generation

A Pt and mediator free route was developed to achieve binary sized AuNPs in g-C3N4for enhanced photocatalytic hydrogen generation.

Mesoporous assembled structures of Cu2O and TiO2nanoparticles for highly efficient photocatalytic hydrogen generation from water

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 54848-54855 ◽  
Author(s):  
I. Tamiolakis ◽  
I. T. Papadas ◽  
K. C. Spyridopoulos ◽  
G. S. Armatas
Keyword(s):  
Visible Light ◽  
Surface Area ◽  
Hydrogen Evolution ◽  
Hydrogen Generation ◽  
Internal Surface ◽  
Internal Surface Area ◽  
Photocatalytic Hydrogen Evolution ◽  
Highly Efficient ◽  
Photocatalytic Hydrogen Generation ◽  
Uv Visible

Mesoporous assemblies of Cu2O/TiO2nanoparticle heterojunctions, which have a large internal surface area and narrow-sized pores, show highly efficient and robust photocatalytic hydrogen evolution from water using UV-visible light.

Composition effect of alloy semiconductors on Pt-tipped Zn1−xCdxSe nanorods for enhanced photocatalytic hydrogen generation

2018 ◽  
Vol 6 (34) ◽  
pp. 16316-16321 ◽  
Author(s):  
Ji Yong Choi ◽  
Ki Min Nam ◽  
Hyunjoon Song
Keyword(s):  
Hydrogen Evolution ◽  
Electron Mobility ◽  
Light Absorption ◽  
Hydrogen Generation ◽  
Composition Effect ◽  
Photocatalytic Hydrogen Evolution ◽  
Photocatalytic Hydrogen Generation ◽  
Alloy Semiconductors

The light absorption and electron mobility of alloy semiconductors significantly influenced the photocatalytic hydrogen evolution of Pt-tipped Zn1−xCdxSe nanorods.

scholarly journals In situ synthesis of g-C3N4/TiO2 heterostructures with enhanced photocatalytic hydrogen evolution under visible light

RSC Advances ◽  
2017 ◽  
Vol 7 (64) ◽  
pp. 40327-40333 ◽  
Author(s):  
Hui Zhang ◽  
Feng Liu ◽  
Hao Wu ◽  
Xin Cao ◽  
Jianhua Sun ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Hydrogen Generation ◽  
In Situ Synthesis ◽  
Light Irradiation ◽  
Photocatalytic Hydrogen Evolution ◽  
Photocatalytic Hydrogen Generation ◽  
Novel Method

C3N4 nanosheets/TiO2 nano-heterostructures have been synthesized via a novel method, exhibiting excellent photocatalytic hydrogen generation under visible light irradiation.

scholarly journals NiO Nanosheets Coupled With CdS Nanorods as 2D/1D Heterojunction for Improved Photocatalytic Hydrogen Evolution

2021 ◽  
Vol 9 ◽  
Author(s):  
Lin Wei ◽  
Deqian Zeng ◽  
Zongzhuo Xie ◽  
Qingru Zeng ◽  
Hongfei Zheng ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Generation ◽  
Low Cost ◽  
Environment Friendly ◽  
Photocatalytic Hydrogen Evolution ◽  
Cds Nanorods ◽  
Highly Active ◽  
Type Semiconductor ◽  
P Type ◽  
Nio Nanosheets

Designing low-cost, environment friendly, and highly active photocatalysts for water splitting is a promising path toward relieving energy issues. Herein, one-dimensional (1D) cadmium sulfide (CdS) nanorods are uniformly anchored onto two-dimensional (2D) NiO nanosheets to achieve enhanced photocatalytic hydrogen evolution. The optimized 2D/1D NiO/CdS photocatalyst exhibits a remarkable boosted hydrogen generation rate of 1,300 μmol h−1 g−1 under visible light, which is more than eight times higher than that of CdS nanorods. Moreover, the resultant 5% NiO/CdS composite displays excellent stability over four cycles for photocatalytic hydrogen production. The significantly enhanced photocatalytic activity of the 2D/1D NiO/CdS heterojunction can be attributed to the efficient separation of photogenerated charge carriers driven from the formation of p-n NiO/CdS heterojunction. This study paves a new way to develop 2D p-type NiO nanosheets-decorated n-type semiconductor photocatalysts for photocatalytic applications.

Large-scale synthesis of stable mesoporous black TiO2 nanosheets for efficient solar-driven photocatalytic hydrogen evolution via an earth-abundant low-cost biotemplate

RSC Advances ◽  
2016 ◽  
Vol 6 (56) ◽  
pp. 50506-50512 ◽  
Author(s):  
Kaifu Zhang ◽  
Wei Zhou ◽  
Xiangcheng Zhang ◽  
Yang Qu ◽  
Lei Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Large Scale ◽  
Hydrogen Generation ◽  
Low Cost ◽  
Photocatalytic Hydrogen Evolution ◽  
Photocatalytic Hydrogen Generation ◽  
Tio2 Nanosheets ◽  
Black Tio2 ◽  
Earth Abundant ◽  
Large Scale Synthesis

Stable mesoporous black anatase TiO2 nanosheets (MBTNs) are synthesized via an earth-abundant low-cost biotemplate method combined with an ethanediamine encircling process, and exhibit excellent solar-driven photocatalytic hydrogen generation.

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.

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