Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 244, Issue -, Pages 594-603Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2018.11.087
Keywords
Photocatalyst; TiO2 nanotubes; Carbon dots; H2O2 synthesis
Funding
- National Key Research and Development Program of China [2018YFB0604801]
- National Natural Science Foundation of China [21822203, 91645105, 91634201]
- Natural Science Foundation of Zhejiang Province [LR18B030002]
- Foundation of Key Laboratory of Low-Carbon Conversion Science AMP
- Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences [KLLCCSE-201605]
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Photocatalytic synthesis of hydrogen peroxide (H2O2) from water and oxygen is an alternative route for clean energy storage and chemical synthesis, but still having problems with insufficient H2O2 productivity and solar-to-chemical energy conversion efficiency. Herein, we reported a hybrid catalyst of proton-form titania nanotube with carbon dot (HTNT-CD) that is highly efficient for the production of H2O2 under visible-light irradiation (lambda > 420 nm, H2O2 productivity at 3.42 mmol g(cat)(-1).h(-1)), outperforming the titania catalysts containing noble metals and the carbon nitride catalysts reported previously. Multiple studies demonstrate that the protons on the HTNT-CD are crucial for the production of H2O2 by efficiently accelerating the half reaction of molecular oxygen reduction to form H2O2, and effectively hindering H2O2 decomposition under the irradiation conditions. This HTNT-CD catalyst gives solar-to-H(2)o(2) apparent energy conversion efficiency at 5.2%, which is even 4.9 times of that (1.06%) over the catalyst derived from commercial P25 and CDs. More importantly, the HTNT-CD is stable, giving high H2O2 productivity in the continuous recycle tests.
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