Porous oxygen vacancy-rich V2O5 nanosheets as superior semiconducting supports of nonprecious metal nanoparticles for efficient on-demand H2 evolution from ammonia borane under visible light irradiation

2019 ◽  
Vol 7 (17) ◽  
pp. 10543-10551 ◽  
Author(s):  
Jin Song ◽  
Xiaojun Gu ◽  
Yaduo Cao ◽  
Hao Zhang
Keyword(s):  
Oxygen Vacancy ◽  
Visible Light ◽  
Metal Nanoparticles ◽  
Visible Light Irradiation ◽  
Oxygen Vacancies ◽  
Ammonia Borane ◽  
H2 Evolution ◽  
On Demand ◽  
Visible Light Driven ◽  
Nonprecious Metal

Porous post-modified V2O5 nanosheets with rich oxygen vacancies are superior semiconducting supports of nonprecious metal nanoparticles for efficient visible-light-driven H2 evolution from aqueous NH3BH3 at 298 K.

scholarly journals Effective Photocatalytic Hydrogen Evolution Using Covalent Triazine Framework-Derived Carbon Nitride Nanofiber Containing Carbon Vacancies for Visible-Light-Driven

2021 ◽  
Vol 11 (16) ◽  
pp. 7222
Author(s):  
Liangjing Zhang ◽  
Aiwu Wang ◽  
Mei Zhang ◽  
Zhengyuan Jin ◽  
Huan Yi ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Active Sites ◽  
Carbon Nitride ◽  
Light Irradiation ◽  
H2 Evolution ◽  
Photoexcited Electron ◽  
Energy And Environment ◽  
Visible Light Driven ◽  
Covalent Triazine Framework

In this study, a novel fibrous carbon nitride (FCN) was prepared from laminated covalent triazine framework (CTF) via pyrolysis, using functionalized 2,5-thiophenedicarboxylic acid and melamine as the precursors. A carbon vacancy was produced by two-step calcination in argon and air atmospheres. These carbon vacancies further exposed the edges and diffusion channels of the FCN nanofibers, which accelerated photogenerated charge transfer and provided more active sites. The FCN was characterized using various techniques and used for H2 evolution under visible-light irradiation. The as-synthesized FCN exhibited excellent stability, and its photocatalytic activity for H2 evolution under visible-light irradiation was 66 times higher than that of bare C3N4 (BCN), attaining a maximum H2 evolution rate of 102.63 μmol in 6 h. The FCN remained stable following visible-light irradiation at the end of 10 cycles. The FCN benefited from the absorption of solar energy and a large number of active sites. These advantages facilitated the efficient separation of photoexcited electron-hole pairs to hinder charge recombination. This work generates new insights into the preparation of highly effective FCN photocatalysts that may be put to various applications, especially in the fields of energy and environment.

Continuous solid solutions of Na0.5La0.5TiO3–LaCrO3 for photocatalytic H2 evolution under visible-light irradiation

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 51801-51806 ◽  
Author(s):  
Jinwen Shi ◽  
Shichao Zong ◽  
Yuchao Hu ◽  
Xiangjiu Guan ◽  
Jiaying Luo ◽  
...  
Keyword(s):  
Visible Light ◽  
Solid Solutions ◽  
Visible Light Irradiation ◽  
Lattice Distortion ◽  
Light Irradiation ◽  
H2 Evolution ◽  
Photocatalytic Activities ◽  
Visible Light Driven ◽  
Photocatalytic H2 Evolution

(Na0.5La0.5TiO3)1−x(LaCrO3)x solid solutions showed enhanced visible-light-driven photocatalytic activities for H2 evolution due to the narrowed bandgaps and increased lattice distortion.

Oxygen vacancy induced superior visible-light-driven photo-catalytic performance in the BiOCl homojunction

2020 ◽  
Vol 4 (8) ◽  
pp. 2314-2324 ◽  
Author(s):  
Siying Niu ◽  
Ruoyu Zhang ◽  
Chongfeng Guo
Keyword(s):  
Oxygen Vacancy ◽  
Visible Light ◽  
Oxygen Vacancies ◽  
Catalytic Performance ◽  
Catalytic Degradation ◽  
Electron Hole ◽  
Effective Separation ◽  
Visible Light Driven

The black BiOCl homojunction with oxygen vacancies has a wide absorption range and results in effective separation of photo-generated electron–hole pairs, which contribute to its superior visible-light-driven photo-catalytic degradation and disinfection ability.

Development of Visible-Light-Driven TiO2 and SrTiO3 Photocatalysts Doped with Metal Cations for H2 or O2 Evolution

2010 ◽  
Vol 162 ◽  
pp. 29-40 ◽  
Author(s):  
Ryo Niishiro ◽  
Akihiko Kudo
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Nitrate Solution ◽  
Silver Nitrate Solution ◽  
Light Irradiation ◽  
O2 Evolution ◽  
H2 Evolution ◽  
Electron Mediator ◽  
Reversible Redox ◽  
Visible Light Driven

This review paper represents photocatalytic properties of metal cation-doped TiO2 (rutile) and SrTiO3 photocatalysts for O2 evolution from an aqueous silver nitrate solution and H2 evolution from an aqueous methanol solution under visible light irradiation. Photocatalytic activities for the O2 evolution of Cr/Sb and Rh/Sb-codoped TiO2 are strongly dependent on the codoping ratio and the amount of doped chromium and rhodium. The codopant controls the oxidation number of doped chromium and rhodium. Rh-doped SrTiO3 in which the doped Rh species possesses a reversible redox property is active for the H2 evolution reaction under visible light irradiation. Overall water splitting under visible light irradiation proceeds with Z-scheme photocatalyst systems consisting of the Rh-doped SrTiO3 as a H2 evolution photocatalyst combined with BiVO4 as an O2 evolution photocatalyst and an Fe3+/Fe2+ electron mediator.

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