The Effect of Cu and Ga Doped ZnIn2S4 under Visible Light on the High Generation of H2 Production

A Cu+ and Ga3+ co-doped ZnIn2S4 photocatalyst (Zn(1−2x)(CuGa)xIn2S4) with controlled band gap was prepared via a simple one-step solvothermal method. Zn(1−2x)(CuGa)xIn2S4 acted as an efficient photocatalyst for H2 evolution under visible light irradiation (λ > 420 nm; 4500 µW/cm2). The effects of the (Cu and Ga)/Zn molar ratios of Zn(1−2x)(CuGa)xIn2S4 on the crystal structure (hexagonal structure), morphology (microsphere-like flower), optical property (light harvesting activity and charge hole separation ability), and photocatalytic activity have been investigated in detail. The maximum H2 evolution rate (1650 µmol·h−1·g−1) was achieved over Zn0.84(CuGa)0.13In2S4, showing a 3.3 times higher rate than that of untreated ZnIn2S4. The bandgap energy of Zn(1−2x)(CuGa)xIn2S4 decreased from 2.67 to 1.90 eV as the amount of doping Cu+ and Ga3+ increased.

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Uniform flower-like BiOBr/BiOI prepared by a new method: visible-light photocatalytic degradation, influencing factors and degradation mechanism

New Journal of Chemistry ◽

10.1039/c9nj03038g ◽

2019 ◽

Vol 43 (37) ◽

pp. 14829-14840 ◽

Cited By ~ 7

Author(s):

Jianhui Li ◽

Quan Zhou ◽

Fan Yang ◽

Lijie Wu ◽

Wenying Li ◽

...

Keyword(s):

Visible Light ◽

Photocatalytic Degradation ◽

Influencing Factors ◽

Solvothermal Method ◽

Degradation Mechanism ◽

Degradation Efficiency ◽

New Method ◽

Molar Ratios ◽

One Step ◽

Visible Light Photocatalytic

BiOBr/BiOI photocatalyst with different molar ratios was synthesized via a simple one-step solvothermal method. The uniform flower-like BiOBr/BiOI (3 : 1) owns high photocatalytic degradation efficiency, excellent recyclability and stability.

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Enhanced Photocatalytic Hydrogen Production of the Polyoxoniobate Modified with RGO and PPy

Nanomaterials ◽

10.3390/nano10122449 ◽

2020 ◽

Vol 10 (12) ◽

pp. 2449

Author(s):

Shiliang Heng ◽

Lei Li ◽

Weiwei Li ◽

Haiyan Li ◽

Jingyu Pang ◽

...

Keyword(s):

Hydrogen Production ◽

Active Sites ◽

High Efficiency ◽

Solvothermal Method ◽

H2 Production ◽

H2 Evolution ◽

Co Catalyst ◽

Photocatalytic Hydrogen Production ◽

Reduced Graphene ◽

One Step

The development of high-efficiency, recyclable, and inexpensive photocatalysts for water splitting for hydrogen production is of great significance to the application of solar energy. Herein, a series of graphene-decorated polyoxoniobate photocatalysts Nb6/PPy-RGO (Nb6 = K7HNb6O19, RGO = reduced graphene oxide, PPy = polypyrrole), with the bridging effect of polypyrrole were prepared through a simple one-step solvothermal method, which is the first example of polyoxoniobate-graphene-based nanocomposites. The as-fabricated photocatalyst showed a photocatalytic H2 evolution activity without any co-catalyst. The rate of 1038 µmol g−1 in 5 h under optimal condition is almost 43 times higher than that of pure K7HNb6O19·13H2O. The influencing factors for photocatalysts in photocatalytic hydrogen production under simulated sunlight were studied in detail and the feasible mechanism is presented in this paper. These results demonstrate that Nb6O19 acts as the main catalyst and electron donor, RGO provides active sites, and PPy acted as an electronic bridge to extend the lifetime of photo-generated carriers, which are crucial factors for photocatalytic H2 production.

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Improvement of Photocatalytic H2-Generation under Visible Light Irradiation by Controlling the Band Gap of ZnIn2S4 with Cu and In

Catalysts ◽

10.3390/catal9080681 ◽

2019 ◽

Vol 9 (8) ◽

pp. 681 ◽

Cited By ~ 1

Author(s):

Ikki Tateishi ◽

Mai Furukawa ◽

Hideyuki Katsumata ◽

Satoshi Kaneco

Keyword(s):

Crystal Structure ◽

Visible Light ◽

Band Gap ◽

Solvothermal Method ◽

H2 Evolution ◽

Electron Hole ◽

H2 Generation ◽

Highly Active ◽

One Step ◽

Photocatalytic H2 Generation

The band gap controlled photocatalyst (Zn0.74Cu0.13In2S3.805) was prepared via a simple one-step solvothermal method. The effects of doping of Cu+ and excess In on the photocatalytic activity of ZnIn2S4 photocatalyst were investigated. In addition, optical properties, surface morphology and crystal structure were evaluated. The maximum H2 evolution rate (2370 µmol h−1 g−1) was achieved with Zn0.74Cu0.13In2S3.805, which was about five times higher than that of untreated ZnIn2S4 under visible light (λ ≥ 420 nm). The band gap of Zn0.74Cu0.13In2S3.805 decreased to 1.98 eV by raising the maximum position of the valence band, compared to ZnIn2S4. Furthermore, the recombination of electron hole pairs was effectively reduced. This research contributes to the development of highly active photocatalysts under visible light.

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Well-designed honeycomb Co3O4@CdS photocatalyst derived from cobalt foam for high-efficiency visible-light H2 evolution

Journal of Materials Chemistry A ◽

10.1039/d0ta11433b ◽

2021 ◽

Author(s):

Chao Zhang ◽

Baoquan Liu ◽

Weiping Li ◽

Xiangxue Liu ◽

Ke Wang ◽

...

Keyword(s):

Visible Light ◽

Water Splitting ◽

High Efficiency ◽

H2 Evolution ◽

One Step

Well-designed honeycomb Co3O4@CdS (H-Co3O4@CdS) was fabricated via a one-step strategy for efficient water splitting. During the decoration of CdS, honeycomb Co3O4 (H-Co3O4) with macropore was formed simultaneously. H-Co3O4 could enhance...

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One-step hydrothermal treatment to fabricate Bi2WO6-reduced graphene oxide nanocomposites for enhanced visible light photoelectrochemical performance

Journal of Materials Chemistry B ◽

10.1039/c6tb02493a ◽

2017 ◽

Vol 5 (20) ◽

pp. 3718-3727 ◽

Cited By ~ 22

Author(s):

Saibo Chen ◽

Hao Nan ◽

Xuan Zhang ◽

Yuting Yan ◽

Zhou Zhou ◽

...

Keyword(s):

Graphene Oxide ◽

Visible Light ◽

Reduced Graphene Oxide ◽

Hydrothermal Treatment ◽

Solvothermal Method ◽

Photoelectrochemical Performance ◽

Reduced Graphene ◽

One Step

Bi2WO6 functionalized reduced oxide nanocomposites were prepared by a one-step solvothermal method and their photoelectrochemical performance was greatly improved.

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Simultaneous manipulation of ion doping and cocatalyst loading into Mn0.3Cd0.7S nanorods toward significantly improved H2 evolution

Catalysis Science & Technology ◽

10.1039/d0cy00095g ◽

2020 ◽

Vol 10 (15) ◽

pp. 5082-5090 ◽

Cited By ~ 1

Author(s):

Yanling Han ◽

Xinfa Dong

Keyword(s):

Solvothermal Method ◽

H2 Evolution ◽

Step Process ◽

Ion Doping ◽

One Step ◽

Facile Solvothermal Method

Ni2P and Ni2+ jointly modified Mn0.3Cd0.7S photocatalysts were successfully fabricated via a facile solvothermal method. The loading of Ni2P and the doping of Ni2+ proceeded simultaneously via a one-step process.

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Influence of Ru(II) Bipyridyl Complex on the Photocatalytic H2 Evolution over TiO2 Nanoparticles with Mesostructures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.47-50.825 ◽

2008 ◽

Vol 47-50 ◽

pp. 825-828 ◽

Cited By ~ 1

Author(s):

Tian You Peng ◽

Ding Ning Ke ◽

Chun Wu ◽

Cai Ping ◽

Liang Ma ◽

...

Keyword(s):

Visible Light ◽

Dynamic Equilibrium ◽

H2 Production ◽

Electron Donors ◽

H2 Evolution ◽

Conjugation System ◽

Antenna Effect ◽

Dye Sensitized ◽

Sensitization Process ◽

Bipyridyl Complex

H2 production over dye-sensitized Pt/TiO2 nanoparticles with mesostructures under visible light was investigated by using methanol as electron donors. Three types of Ru(II) bipyridyl complexes, which can be attached to Pt/m-TiO2 with different linkage modes, show different photosensitization. The dye tightly linked with m-TiO2 has better durability but the lowest H2 evolution efficiency, whereas the loosely attached dyes possess higher H2 evolution efficiency and preferable durability. It seems that the dynamic equilibrium between the linkage of ground state dye with TiO2 and the divorce of oxidization state dye from the surfaces plays a crucial role in the photochemical behavior during photocatalyst sensitization process. The binuclear Ru(II) shows a better photosensitization in comparison with mono- nuclear Ru(II) dyes due to its large conjugation system and “antenna effect”, which, in turn, improve the visible light harvesting and electron transfer between the dye and TiO2.

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In situ formed Bi/BiOBrxI1−x heterojunction of hierarchical microspheres for efficient visible-light photocatalytic activity

Physical Chemistry Chemical Physics ◽

10.1039/c5cp01655j ◽

2015 ◽

Vol 17 (20) ◽

pp. 13347-13354 ◽

Cited By ~ 46

Author(s):

Chunrui Zheng ◽

Chuanbao Cao ◽

Zulfiqar Ali

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Solvothermal Method ◽

Visible Light Photocatalytic Activity ◽

Hierarchical Microspheres ◽

One Step ◽

Visible Light Photocatalytic

Bi/BiOBrxI1−x heterojunction of hierarchical microspheres formed in situ with efficient visible-light photocatalytic activity were synthesized by a facile one-step solvothermal method.

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Construction of K+ ions gradient in crystalline carbon nitride to accelerate charge separation for efficient visible light H2 production

10.21203/rs.3.rs-145087/v1 ◽

2021 ◽

Author(s):

Guoqiang Zhang ◽

Yangsen Xu ◽

Chuan-Xin He ◽

Yongliang Li ◽

Xiangzhong Ren ◽

...

Keyword(s):

Visible Light ◽

Driving Force ◽

Carbon Nitride ◽

Photocatalytic Performance ◽

H2 Production ◽

H2 Evolution ◽

Concentration Gradients ◽

Diffusion Controlled ◽

Activity Enhancement ◽

First Time

Abstract Like most of the recent reported semiconductor photocatalysts, the sluggish dynamic charges transfer and separation caused by weak driving force still restricts the further improvement of photocatalytic performance in crystalline carbon nitride (CCN). Here, we successfully prepared a series of heptazine-based K+ implanted CCN (KCN) for the first time, where the K+ ions concentration was gradiently inserted through controlling its diffusion from the surface to bulk in carbon nitride (CN). As a powerful driving force, the built-in electric field (BIEF) induced by this concentration gradient, greatly accelerates the drift movement and the transport from bulk to the surface, as well as the separation of photogenerated carriers. Consequently, the KCN with optimized BIEF displays a ～34 times promotion than original CN for visible-light H2 evolution. Such a high activity enhancement factor is at a relatively good level in reported CCN. Our proposed strategy to induce BIEF production by constructing concentration gradients through thermodynamically feasible diffusion controlled solid-state reaction, can be adopted to build other efficient photocatalytic systems.

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