Fabricating efficient CdSe–CdS photocatalyst systems by spatially resetting water splitting sites

2017 ◽  
Vol 5 (38) ◽  
pp. 20131-20135 ◽  
Author(s):  
Zhijian Wang ◽  
Junmei Wang ◽  
Li Li ◽  
Jianfeng Zheng ◽  
Suping Jia ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Generation Rate ◽  
Photocatalytic Hydrogen Generation ◽  
Speed Up

Modulating reaction sites and charge transfer can speed up the photocatalytic hydrogen generation rate from 1.0 to 1270 mmol g−1 h−1.

scholarly journals Structure-controlled CdS(0D, 1D, 2D) embedded onto 2D ZnS porous nanosheets for highly efficient photocatalytic hydrogen generation

RSC Advances ◽  
2017 ◽  
Vol 7 (40) ◽  
pp. 24864-24869 ◽  
Author(s):  
Junmei Wang ◽  
Zhijian Wang ◽  
Li Li ◽  
Jiazang Chen ◽  
Jianfeng Zheng ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Conduction Band ◽  
Hydrogen Generation ◽  
Generation Rate ◽  
Band Energy ◽  
Highly Efficient ◽  
Photocatalytic Hydrogen Generation ◽  
Porous Nanosheets ◽  
Speed Up

Modulating the CdS morphology with a 1D structure with high conduction band energy can speed up the electron transfer to Pt sites and increase the photocatalytic hydrogen generation rate from 7.7 to 26 mmol g−1 h−1.

scholarly journals Thickness-dependent photoelectrochemical properties of a semitransparent Co3O4 photocathode

2018 ◽  
Vol 9 ◽  
pp. 2432-2442 ◽  
Author(s):  
Malkeshkumar Patel ◽  
Joondong Kim
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Hydrogen Generation ◽  
Hydrogen Gas ◽  
Generation Rate ◽  
Alkaline Electrolyte ◽  
Stoichiometric Ratio ◽  
Gas Generation ◽  
Pec Cells ◽  
Gas Generation Rate

Co3O4 has been widely studied as a catalyst when coupled with a photoactive material during hydrogen production using water splitting. Here, we demonstrate a photoactive spinel Co3O4 electrode grown by the Kirkendall diffusion thermal oxidation of Co nanoparticles. The thickness-dependent structural, physical, optical, and electrical properties of Co3O4 samples are comprehensively studied. Our analysis shows that two bandgaps of 1.5 eV and 2.1 eV coexist with p-type conductivity in porous and semitransparent Co3O4 samples, which exhibit light-induced photocurrent in photoelectrochemical cells (PEC) containing the alkaline electrolyte. The thickness-dependent properties of Co3O4 related to its use as a working electrode in PEC cells are extensively studied and show potential for the application in water oxidation and reduction processes. To demonstrate the stability, an alkaline cell was composed for the water splitting system by using two Co3O4 photoelectrodes. The oxygen gas generation rate was obtained to be 7.17 mL·h−1 cm−1. Meanwhile, hydrogen gas generation rate was almost twice of 14.35 mL·h−1·cm−1 indicating the stoichiometric ratio of 1:2. We propose that a semitransparent Co3O4 photoactive electrode is a prospective candidate for use in PEC cells via heterojunctions for hydrogen generation.

Quaternary two dimensional Zn–Ag–In–S nanosheets for highly efficient photocatalytic hydrogen generation

2018 ◽  
Vol 6 (25) ◽  
pp. 11670-11675 ◽  
Author(s):  
Hao Chen ◽  
Xiao-Yuan Liu ◽  
Shizhuo Wang ◽  
Xu Wang ◽  
Qi Wei ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Water Splitting ◽  
Energy Production ◽  
Hydrogen Generation ◽  
Two Dimensional ◽  
Photocatalytic Water Splitting ◽  
Highly Efficient ◽  
Photocatalytic Hydrogen Generation ◽  
Promising Strategy ◽  
Renewable Energy Production

Hydrogen generation based on photocatalytic water splitting is a promising strategy for renewable energy production.

scholarly journals Hydrogen Production Improvement on Water Decomposition Through Internal Interfacial Charge Transfer in M3(PO4)2-M2P2O7 Mixed-Phase Catalyst (M = Co, Ni, and Cu)

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 602
Author(s):  
Junyeong Kim ◽  
Jun Neoung Heo ◽  
Jeong Yeon Do ◽  
Seog Joon Yoon ◽  
Youngsoo Kim ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Visible Light ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Light Response ◽  
Mixed Phase ◽  
Interface Charge ◽  
Production Improvement ◽  
Active Metal ◽  
Two Phases

In this study, three types of Nasicon-type materials, Co3(PO4)2-CO2P2O7, Ni3(PO4)2-Ni2P2O7, and Cu3(PO4)2-Cu2P2O7, were synthesized as mixed-phase catalysts (MPCs) for evaluating their potential as new photocatalytic candidates (called Co3(PO4)2-CO2P2O7mpc, Ni3(PO4)2-Ni2P2O7mpc, and Cu3(PO4)2-Cu2P2O7mpc herein). Based on various physical properties, it was confirmed that there are two phases, M3(PO4)2 and M2P2O7, in which a similar phase equilibrium energy coexists. These colored powders showed UV and visible light responses suitable to our aim of developing 365-nm light-response photocatalysts for overall water-splitting. The photocatalytic performance of Ni2(PO4)3-Ni2P2O7 MPC showed negligible or no activity toward H2 evolution. However, Co2(PO4)3-Co2P2O7 MPC and Cu3(PO4)2-Cu2P2O7 MPC were determined as interesting materials because of their ability to absorb visible light within a suitable band. Moreover, an internal interface charge transfer was suggested to occur that would lower the recombination rate of electrons and holes. For Cu3(PO4)2-Cu2P2O7 MPC, the charge separation between the electron and hole was advantageously achieved, a water-splitting reaction was promoted, and hydrogen generation was considerably increased. The performance of a catalyst depended on the nature of the active metal added. In addition, the performance of the catalyst was improved when electrons migrated between the inter-phases despite the lack of a heterojunction with other crystals.

Electrochemical tuning of heterojunctions in TiO2 nanotubes for efficient solar water splitting

2019 ◽  
Vol 9 (19) ◽  
pp. 5425-5432 ◽  
Author(s):  
L. K. Preethi ◽  
Tom Mathews
Keyword(s):  
Water Splitting ◽  
Tio2 Nanotubes ◽  
Hydrogen Generation ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Photocatalytic Hydrogen Generation ◽  
Electrochemical Tuning

The electrochemical assisted biphase ↔ triphase switching in TiO2 nanotubes and their comprehensive photocatalytic hydrogen generation efficiencies are presented.

Improved charge transfer by binary Ni3S2-NiS2 for boosting the photocatalytic hydrogen generation over g-C3N4

2022 ◽  
Vol 307 ◽  
pp. 131012
Author(s):  
Chuanjun Xi ◽  
Puhui Deng ◽  
Danyang Miao ◽  
Linping Zhang ◽  
Weiping Liu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Hydrogen Generation ◽  
Photocatalytic Hydrogen Generation

Highly efficient photocatalytic hydrogen generation by incorporating CdS into ZnCr-layered double hydroxide interlayer

RSC Advances ◽  
2015 ◽  
Vol 5 (8) ◽  
pp. 5823-5829 ◽  
Author(s):  
Guohua Zhang ◽  
Bizhou Lin ◽  
Weiwei Yang ◽  
Shaofeng Jiang ◽  
Qianru Yao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Layered Double Hydroxide ◽  
Hydrogen Generation ◽  
Cds Nanoparticles ◽  
Highly Efficient ◽  
Photocatalytic Hydrogen Generation ◽  
Double Hydroxide

Incorporating CdS nanoparticles into the interlayer of ZnCr–LDH nanosheets led to the formation of CdS-pillared ZnCr–LDH nanohybrid, which exhibited superior photocatalytic hydrogen-generation performance from water splitting.

scholarly journals Hierarchical Ternary Sulfides as Effective Photocatalyst for Hydrogen Generation Through Water Splitting: A Review on the Performance of ZnIn2S4

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 277
Author(s):  
Ravichandran Janani ◽  
Raja Preethi V ◽  
Shubra Singh ◽  
Aishwarya Rani ◽  
Chang-Tang Chang
Keyword(s):  
Water Splitting ◽  
Light Absorption ◽  
Hydrogen Generation ◽  
Low Cost ◽  
Charge Carriers ◽  
Special Focus ◽  
Material Efficiency ◽  
Photocatalytic Hydrogen Generation ◽  
Ternary Sulfide ◽  
Cost Efficient

One of the major aspects and advantages of solar energy conversion is the photocatalytic hydrogen generation using semiconductor materials for an eco-friendly technology. Designing a low-cost efficient material to overcome limited light absorption as well as rapid recombination of photogenerated charge carriers is essential to achieve considerable hydrogen generation. In recent years, sulfide based semiconductors have attracted scientific research interest due to their excellent solar response and narrow band gap. The present review focuses on the recent approaches in the development of hierarchical ternary sulfide based photocatalysts with a special focus on ZnIn2S4. We also observe how the electronic structure of ZnIn2S4 is beneficial for water splitting and the various strategies involved for improving the material efficiency for photocatalytic hydrogen generation. The review places emphasis on the latest advancement/new insights on ZnIn2S4 being used as an efficient material for hydrogen generation through photocatalytic water splitting. Recent progress on essential aspects which govern light absorption, charge separation and transport are also discussed in detail.

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