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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
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Electron-Trap Induced "Hot" Microenvironment Boosting Photocatalytic Nitrogen Fixation.
Bing-Hao Wang1, Guang-Hui Chen1, Sheng Tian1
1Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo and Biosensing, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P.R. China.
Angewandte Chemie (International Ed. in English)
|November 25, 2025
Summary
This study introduces a novel photocatalyst for efficient ammonia production via nitrogen reduction. The material utilizes hot carriers to overcome reaction barriers, significantly boosting catalytic performance and solar-to-ammonia conversion efficiency.
Area of Science:
- Materials Science
- Catalysis
- Photochemistry
Background:
- Plasmonic photocatalysis utilizes hot carriers for challenging reactions like nitrogen reduction.
- Hot carrier thermalization limits efficiency in traditional systems.
- Understanding hot carrier roles in surface reactions is crucial.
Purpose of the Study:
- To design a photocatalyst for efficient nitrogen reduction to ammonia.
- To investigate the mechanism of hot carrier involvement in photocatalysis.
- To enhance solar-to-ammonia conversion efficiency.
Main Methods:
- Loading gold nanoparticles on Mo-doped W18O49 nanorods (Au-MWO-S).
- In situ experiments and theoretical simulations.
- Characterization of hot electron trapping and surface microenvironment.
Main Results:
- Achieved ammonia formation rate of 571.0 µmol h⁻¹ g⁻¹.
- Reached solar-to-ammonia (STA) conversion efficiency of 0.28%.
- Identified shallow energy-level defects as electron traps, reducing hot electron thermalization.
Conclusions:
- The designed Au-MWO-S photocatalyst efficiently converts nitrogen to ammonia.
- Shallow defects and enhanced local electromagnetic fields create an active "hot" microenvironment.
- This work elucidates hot carrier mechanisms, advancing catalytic system design.
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