Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Sacrificial agent-free photocatalytic H2O2 evolution via two-electron oxygen reduction using a ternary α-Fe2O3/CQD@g-C3N4 photocatalyst with broad-spectrum response

Author affiliations

Abstract

Ultrathin g-C3N4 nanosheets have been fabricated via a two-step calcination regulated by melamine precursors at a high heating rate (30 °C min−1). The resulting g-C3N4 nanosheets were further employed as carriers for the growth of carbon quantum dots (CQDs) and (110) exposed α-Fe2O3 through the PVP-enabled adsorption effects by a solvothermal process. It was discovered that the so fabricated ternary photocatalyst α-Fe2O3/CQD@g-C3N4 presented a broad-spectrum absorption range (up to 800 nm) and particularly enhanced active sites of photogenerated electrons for highly efficient photocatalytic oxygen reduction toward H2O2 evolution in pure water. A H2O2 production rate of 1.16 μM min−1 could be expected for the developed photocatalyst under visible light irradiation, which is about 19 times faster than that of pure ultrathin g-C3N4. Herein, the loaded Fe2O3 could transform the H2O2 evolution from two-step single-electron reduction into one-step two-electron one, as verified by the various active species experiments and rotating ring-disk electrode tests. This work presents a new perspective in designing ultrathin g-C3N4 through a simple method of precursor-regulated calcination, which features more outstanding advantages than the conventional exfoliation of bulk g-C3N4 towards ultrathin g-C3N4. More importantly, it provides an optimized photocatalytic reaction route of two-electron oxygen reduction for efficient H2O2 production in pure water under visible light irradiation, without the need for noble metals or organic sacrificial agents.

Graphical abstract: Sacrificial agent-free photocatalytic H2O2 evolution via two-electron oxygen reduction using a ternary α-Fe2O3/CQD@g-C3N4 photocatalyst with broad-spectrum response

Back to tab navigation

Supplementary files

Article information


Submitted
09 Jun 2020
Accepted
06 Aug 2020
First published
08 Aug 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Sacrificial agent-free photocatalytic H2O2 evolution via two-electron oxygen reduction using a ternary α-Fe2O3/CQD@g-C3N4 photocatalyst with broad-spectrum response

X. Chen, W. Zhang, L. Zhang, L. Feng, C. Zhang, J. Jiang, T. Yan and H. Wang, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/D0TA05753C

Social activity

Search articles by author

Spotlight

Advertisements