Constructing Internal Electric Field in g-C3N4 Significantly Promotes the Photocatalytic Performance for H2O2 Generation

AbstractHeterojunctions modulated internal electric field (IEF) usually result in suboptimal efficiencies in carrier separation and utilization because of the narrow IEF distribution and long migration paths of photocarriers. In this work, we report distinctive bismuth oxyhydroxide compound nanorods (denoted as BOH NRs) featuring surface-exposed open channels and a simple chemical composition; by simply modifying the bulk anion layers to overcome the limitations of heterojunctions, the bulk IEF could be readily modulated. Benefiting from the unique crystal structure and the localization of valence electrons, the bulk IEF intensity increases with the atomic number of introduced halide anions. Therefore, A low exchange ratio (~10%) with halide anions (I–, Br–, Cl–) gives rise to a prominent elevation in carrier separation efficiency and better photocatalytic performance for benzylamine coupling oxidation. Here, our work offers new insights into the design and optimization of semiconductor photocatalysts.

Download Full-text

Photoreduction route for Cu2O/TiO2 nanotubes junction for enhanced photocatalytic activity

RSC Advances ◽

10.1039/c8ra01363b ◽

2018 ◽

Vol 8 (22) ◽

pp. 12420-12427 ◽

Cited By ~ 22

Author(s):

Van Viet Pham ◽

Dai Phat Bui ◽

Hong Huy Tran ◽

Minh Thi Cao ◽

Tri Khoa Nguyen ◽

...

Keyword(s):

Photocatalytic Activity ◽

Electric Field ◽

Tio2 Nanotubes ◽

Photocatalytic Performance ◽

Internal Electric Field ◽

Lower Power ◽

Uv Lamp ◽

Good Photocatalytic Performance

Good photocatalytic performance is demonstrated by Cu2O NPs directly loaded onto hydrothermally synthesized TiO2 NTs via photoreduction method conducted with a lower power UV lamp at room temp. This is due to narrowing bandgap and forming an internal electric field.

Download Full-text

Enhanced Photocatalytic Activity by the Combined Influence of Ferroelectric Domain and Au Nanoparticles for BaTiO3 Fibers

NANO ◽

10.1142/s1793292018501497 ◽

2018 ◽

Vol 13 (12) ◽

pp. 1850149 ◽

Cited By ~ 1

Author(s):

Xiaoshan Zhang ◽

Yu Huan ◽

Yuanna Zhu ◽

Hui Tian ◽

Kai Li ◽

...

Keyword(s):

Photocatalytic Activity ◽

Surface Plasmon Resonance ◽

Electric Field ◽

Photocatalytic Performance ◽

Au Nanoparticles ◽

Ferroelectric Domain ◽

Single Domain ◽

Internal Electric Field ◽

Domain Configuration ◽

And Migration

Ferroelectric particles have been applied in the photocatalytic field because the spontaneous polarization results in the internal electric field, which can accelerate the separation and migration of photogenerated carriers. In this study, the BaTiO3 (BT) fibers are synthesized by electrospinning. The BT fibers calcined above 800[Formula: see text]C exhibit a strong ferroelectric property, which is verified by a typical butterfly-shaped displacement-voltage loop. It is found that the BT fibers with the single-domain structure exhibit better photocatalytic performance than that with the multi-domain configuration. When the single-domain transforms into multi-domain, the integrated internal electric field correspondingly breaks up, inducing that the internal electric field might cancel each other out and diminish the separation of photogenerated carriers. Also, the Au nanoparticles can improve the photocatalytic activity further on account of the surface plasmon resonance. Therefore, it is suggested that Au nanoparticles decorated on ferroelectric BT nanomaterials are promising photocatalysts.

Download Full-text

Interfacial Chemical Bond and Internal Electric Field Modulated Z-Scheme Vs-ZnIn2S4/MoSe2 Photocatalyst for Efficient Hydrogen Evolution

10.21203/rs.3.rs-208751/v1 ◽

2021 ◽

Author(s):

Xuehua Wang ◽

Xianghu Wang ◽

Jianfeng Huang ◽

Shaoxiang Li ◽

Alan meng ◽

...

Keyword(s):

Charge Transfer ◽

Electric Field ◽

Hydrogen Evolution ◽

Photocatalytic Performance ◽

Monochromatic Light ◽

Spin Trapping ◽

Atomic Level ◽

Internal Electric Field ◽

Apparent Quantum Yield ◽

Interface Control

Abstract Construction of Z-scheme heterostructure is of momentous significance for realizing efficient photocatalytic water splitting. However, the consciously modulate of Z-scheme charge transfer is still a great challenge. Herein, interfacial Mo-S bond and internal electric field modulated Z-Scheme heterostructure composed by sulfur vacancies-rich ZnIn2S4 (Vs-ZIS) and MoSe2 was rationally fabricated for efficient photocatalytic hydrogen evolution. Systematic investigations reveal that Mo-S bond and internal electric field induce the Z-scheme charge transfer mechanism as confirmed by the SPS and DMPO spin-trapping EPR spectra. Under the intense synergy among the Mo-S bond, internal electric field and S-vacancies, the optimized photocatalyst exhibits ultrahigh hydrogen evolution rate of 63.21 mmol∙g-1·h-1 with an apparent quantum yield of 76.48% at 420 nm monochromatic light, which is about 18.8-fold of the pristine ZIS. This work affords a new inspiration on consciously modulating Z-scheme charge transfer by atomic-level interface control and internal electric field to signally promote the photocatalytic performance.

Download Full-text