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Efficient photocatalytic water splitting through titanium silicalite stabilized CoO nanodots
Mengmeng Zhu1, Cheng Zhu, Dan Wu
1Institute of Functional Nano and Soft Materials Laboratory (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, PR China. hhuang0618@suda.edu.cn yangl@suda.edu.cn zhkang@suda.edu.cn.
Nanoscale
|August 20, 2019
Summary
This study introduces a stable cobalt oxide (CoO) photocatalyst using titanium silicalite-1 (TS-1) for efficient water splitting into hydrogen and hydrogen peroxide. The enhanced catalyst demonstrates high production rates and stability, enabling direct use in valuable chemical synthesis.
Area of Science:
- Materials Science
- Photocatalysis
- Green Chemistry
Background:
- Cobalt oxide (CoO) shows promise for photocatalytic water splitting to produce hydrogen (H2) and hydrogen peroxide (H2O2), addressing energy needs.
- A major challenge for CoO photocatalysts is their instability due to oxidation by the H2O2 product, limiting practical applications.
Purpose of the Study:
- To enhance the stability and performance of CoO photocatalysts for water splitting.
- To develop a method for efficient separation and utilization of H2O2 produced during photocatalysis.
Main Methods:
- Anchoring monodisperse CoO nanodots onto a titanium silicalite-1 (TS-1) framework.
- Utilizing TS-1 to prevent CoO aggregation, oxidation, and deactivation.
- Assessing the photocatalytic production rates of H2 and H2O2, and the photostability of the CoO-TS-1 composite.
Main Results:
- The CoO-TS-1 composite exhibited significant H2 and H2O2 production rates of 1460 and 1390 μmol h-1 gCoO-1, respectively.
- The material demonstrated excellent photostability, maintaining performance for approximately 168 hours.
- The harvested H2O2 was effectively used for cyclohexane oxidation, achieving up to 89.48% selectivity for cyclohexanol and cyclohexanone.
Conclusions:
- TS-1 framework successfully stabilizes CoO nanodots, improving photocatalytic efficiency and longevity.
- This approach offers a stable and efficient method for producing H2 and H2O2 from water.
- The developed photocatalyst and its product utilization strategy present a promising pathway for sustainable chemical synthesis.
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