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Published on: October 5, 2019
High-Efficiency and Stability Phenothiazine-Based D-(A'-π-A)2 Sensitized Photocatalytic Hydrogen Evolution Under
Yu Hsuan Lin1, Xiao-Feng Shen2,3, Yu-Tong Hung1
1Department of Chemistry, Tunghai University, Taichung, Taiwan.
Chemsuschem
|June 13, 2026
Summary
Novel phenothiazine (PTZ)-based photocatalysts integrated with Pt@TiO2 show enhanced hydrogen evolution. PTZ-2, featuring benzothiadiazole, achieved superior performance and stability, highlighting efficient charge transfer for sustainable energy applications.
Area of Science:
- Materials Science
- Photocatalysis
- Renewable Energy
Background:
- Developing efficient photocatalysts is crucial for sustainable hydrogen production.
- Phenothiazine (PTZ)-based materials offer tunable electronic properties for photocatalysis.
- Integrating photocatalysts with co-catalysts like Pt@TiO2 can enhance charge separation and activity.
Purpose of the Study:
- To design and synthesize novel PTZ-based photocatalysts for enhanced photocatalytic hydrogen evolution.
- To investigate the structure-activity relationship of PTZ derivatives with different auxiliary acceptors.
- To evaluate the performance and stability of these photocatalysts when coupled with Pt@TiO2.
Main Methods:
- Rational design of PTZ derivatives (PTZ-1, PTZ-2, PTZ-3) with D-(π-A)2 and D-(A'-π-A)2 architectures.
- Immobilization of PTZ photocatalysts onto Pt@TiO2 using dianchoring groups.
- Photocatalytic hydrogen evolution experiments under visible light irradiation.
- Characterization of photocatalyst properties including electron lifetime and charge-transfer resistance.
Main Results:
- PTZ-2, incorporating benzothiadiazole (BTD), exhibited the highest photocatalytic activity.
- PTZ-2 achieved a high turnover number (TON) of 10,714.2 and turnover frequency (TOF) of 691.2 after 15.5 h.
- The BTD unit in PTZ-2 facilitated favorable energy-level alignment and enhanced electron-injection efficiency.
- PTZ-2 demonstrated excellent long-term stability, retaining 97% activity after 60 h, with the longest electron lifetime (0.62 ns) and lowest charge-transfer resistance.
Conclusions:
- The designed PTZ-based photocatalysts, particularly PTZ-2, show significant potential for efficient and stable hydrogen production.
- The incorporation of auxiliary acceptors like BTD is an effective strategy to boost photocatalytic performance.
- Efficient interfacial charge transfer and suppressed charge recombination are key factors for high photocatalytic activity and stability.
Keywords:
phenothiazine‐based D‐(π–A)2 configuration photocatalystspyridinyl acrylonitrile anchoring groupwater splitting hydrogen productionMore Related Videos
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