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Lewis-Base Coordination Enables Highly Dispersed Pt Cocatalyst on Pyrene-Based MOFs for Enhanced Photocatalytic
Shuaiqi Guo1, Haibing Meng1, Gang Yu1
1College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, People's Republic of China.
We engineered platinum (Pt) cocatalyst coordination on metal-organic frameworks (MOFs) using Lewis-base groups. This optimized electronic metal-support interactions (EMSI), significantly boosting photocatalytic hydrogen evolution activity and stability.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Optimizing platinum (Pt)-based cocatalysts is crucial for efficient photocatalysis.
- Tailoring electronic metal-support interactions (EMSI) is key to enhancing charge separation and lowering reaction barriers.
Purpose of the Study:
- To engineer Pt cocatalyst coordination on pyrene-based metal-organic frameworks (MOFs) by grafting Lewis-base groups.
- To investigate how the softness of grafted groups influences Pt precursor affinity and EMSI.
- To correlate distinct Pt coordination structures with photocatalytic performance.
Main Methods:
- Grafting various Lewis-base groups onto pyrene-based MOFs.
- Characterizing the electronic metal-support interactions (EMSI) between Pt and MOFs.
- Evaluating photocatalytic hydrogen evolution rates under full-spectrum light irradiation.
- Assessing catalyst stability over extended operational periods.
Main Results:
- The -SH-functionalized MOF (Pt/NU-M) exhibited atomic dispersion of Pt-O/S coordination due to strong EMSI.
- Pt/NU-M achieved a superior hydrogen evolution rate of 5.68 mmol gcat-1 h-1, approximately 16 times higher than the control.
- The engineered catalyst demonstrated exceptional stability, maintaining performance over 20 hours of continuous operation.
Conclusions:
- Lewis-base coordination is an effective strategy for tailoring active sites and optimizing EMSI in Pt-based cocatalysts.
- Rational catalyst design based on controlled coordination structures significantly enhances photocatalytic activity.
- This approach offers valuable insights for developing advanced catalysts for energy applications.
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