Hydrothermal preparation of carbon modified KNb3O8 nanosheets for efficient photocatalytic H2 evolution
Source abstract
Abstract
Abstract The carbon loaded KNb3O8 nanosheets composite has been synthesized for the first time by hydrothermal method, displaying an outstanding performance in photocatalytic H2 evolution. The optimal C/KNb3O8 sample exhibits a H2-generation rate of 1148 μmol g−1 h−1 under simulated solar illumination, which is 1.8 times that of pristine KNb3O8. Various characterizations including N2 adsorption, XRD, XPS, Raman, DRS, transient photocurrent, EIS, LSV have been applied to investigate the behind mechanism. It is found that the introduction of carbon shows a slight effect on the specific surface area, but obviously improves the optical property and charge separation efficiency. The introduced carbon mainly acts as electron trapper to accept the photoexcited electrons from the conduction band of KNb3O8, and hence enhances the efficiency in separating electron-hole pairs, which plays a key role in improving the photocatalytic reaction. The cycling test further demonstrates that the C/KNb3O8 has high photocatalytic stability, indicating its good potential for practical photocatalytic H2 evolution.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Layered Double Hydroxides Synthesis and Applications · Perovskite Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (32)
Show source-provided references
1. Selected perovskite oxides: characterization, preparation and photocatalytic properties—a review10.1016/j.apcatb.2015.12.035 ↗
2. Giant enhancement of photocatalytic H2 production over KNbO3 photocatalyst obtained via carbon doping and MoS2 decoration10.1016/j.ijhydene.2018.01.055 ↗
3. Synthesis of carbon doped KTaO3 and its enhanced performance in photocatalytic H2-generation10.1016/j.catcom.2018.02.006 ↗
4. Hydrothermal synthesis and photocatalytic properties of ATaO3 and ANbO3 (A=Na and K)10.1016/j.ijhydene.2006.10.005 ↗
5. Photocatalytic decomposition of water over NiO/K4Nb6O17 catalyst10.1016/0021-9517(88)90066-8 ↗
6. Fabrication and photocatalytic performance of highly crystalline nanosheets derived from flux-grown KNb3O8 crystals10.1039/C1CE06035J ↗
7. Hydrothermal synthesis of bamboo-shaped nanosheet KNb3O8 with enhanced photocatalytic activity10.1016/j.jallcom.2014.12.115 ↗
8. Hydrothermal synthesis of ZnO quantum dot/KNb3O8 nanosheet photocatalysts for reducing carbon dioxide to methanol10.3762/bjnano.8.226 ↗
9. Light-activated Ullmann homocoupling of aryl halides catalyzed using gold nanoparticle functionalized potassium niobium oxides10.1039/C8CY00996A ↗
10. Photocatalytic activity of nanostructured composites based on layered niobates and C3N4 in the hydrogen evolution reaction from electron donor solutions under visible light10.1016/j.ijhydene.2017.07.238 ↗
11. Photocatalytic effect of carbon-modified n-TiO2 nanoparticles under visible light illumination10.1016/j.apcatb.2005.11.008 ↗
12. Combination effect of ZnO and activated carbon for solar assisted photocatalytic degradation of Direct Blue 5310.1016/j.solmat.2006.12.013 ↗
13. Novel carbon modified KTa0.75Nb0.25O3 nanocubes with excellent efficiency in photocatalytic H2 evolution10.1016/j.fuel.2018.06.090 ↗
14. A carbon modified NaTaO3 mesocrystal nanoparticle with excellent efficiency of visible light induced photocatalysis10.1039/C4TA04132A ↗
15. Ionic liquid-induced strategy for carbon quantum dots/BiOX (X= Br, Cl) hybrid nanosheets with superior visible light-driven photocatalysis10.1016/j.apcatb.2015.07.035 ↗
16. Formation, structure and physical properties of a series of α-MoO3 nanocrystals: from 3D to 1D and 2D10.1039/c2ce06567c ↗
17. Oxygen vacancy effect on photoluminescence of KNb3O8 nanosheets10.1016/j.apsusc.2017.12.218 ↗
18. Enhanced photocatalytic performance of carbon quantum dots/BiOBr composite and mechanism investigation10.1016/j.cclet.2018.05.002 ↗
19. Synthesis of carbon-doped KNbO3 photocatalyst with excellent performance for photocatalytic hydrogen production10.1016/j.solmat.2018.01.043 ↗
20. Preparation of interstitial carbon doped BiOI for enhanced performance in photocatalytic nitrogen fixation and methyl orange degradation10.1016/j.jcis.2018.12.101 ↗
21. Rapid fabrication of KTa0.75Nb0.25/g-C3N4 composite via microwave heating for efficient photocatalytic H2 evolution10.1016/j.fuel.2018.12.011 ↗
22. Room temperature ferromagnetic behavior, linear and nonlinear optical properties of KNbO3 microrods10.1016/j.ceramint.2017.11.104 ↗
23. In situ preparation of g-C3N4/Bi4O5I2 complex and its elevated photoactivity in Methyl Orange degradation under visible light10.1016/j.jes.2019.05.032 ↗
24. Application of Ag/AgBr/GdVO4 composite photocatalyst in wastewater treatment10.1016/j.jes.2017.06.020 ↗
25. A novel magnetic photocatalyst Bi3O4Cl/SrFe12O19: fabrication, characterization and its photocatalytic activity10.1016/j.ceramint.2019.08.283 ↗
26. Enhanced photocatalytic activity of novel TiO2/Ag/MoS2/Ag nanocomposites for water-treatment
27. Visible-light-active g-C3N4/N-doped Sr2Nb2O7 heterojunctions as photocatalysts for the hydrogen evolution reaction10.1039/C8SE00319J ↗
28. Oxygen-rich TiO2 decorated with C-Dots: highly efficient visible-light-responsive photocatalysts in degradations of different contaminants10.1016/j.apt.2019.03.014 ↗
29. New application and excellent performance of Ag/KNbO3 nanocomposite in photocatalytic NH3 synthesis
30. Zn-vacancy mediated electron-hole separation in ZnS/g-C3N4 heterojunction for efficient visible-light photocatalytic hydrogen production10.1016/j.apcatb.2018.02.006 ↗
31. Core-shell Fe3O4-ZnO nanoparticles decorated on reduced graphene oxide for enhanced photoelectrochemical water splitting10.1016/j.ceramint.2014.12.084 ↗
32. Effectively H2 generation over CdS/KTa0.75Nb0.25O3 composite via water splitting10.1016/j.jcis.2019.05.098 ↗