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Accelerating Oxygen Electrocatalysis Kinetics on Metal-Organic Frameworks via Bond Length Optimization
Fan He1, Yingnan Liu1, Xiaoxuan Yang1
1Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China.
Nano-Micro Letters
|April 19, 2024
Summary
We optimized metal-organic frameworks (MOFs) for efficient water splitting catalysis. Our strategy enhances catalytic activity and stability, paving the way for practical hydrogen production.
Area of Science:
- Materials Science
- Catalysis
- Renewable Energy
Background:
- Metal-organic frameworks (MOFs) offer a tunable platform for catalysis but suffer from limited activity and stability in water splitting.
- Developing efficient and stable catalysts is crucial for practical water splitting and hydrogen production.
Purpose of the Study:
- To optimize naphthalene-based MOFs for enhanced water splitting catalysis.
- To investigate the structure-activity relationship in MOFs for improved catalytic performance.
Main Methods:
- Synthesized acid-etched Co-naphthalenedicarboxylic acid-based MOFs (AE-CoNDA) using a bond length adjustment strategy.
- Evaluated AE-CoNDA as a catalyst for water splitting, both independently and integrated with BiVO4.
- Utilized experimental investigations and theoretical calculations to understand the catalytic mechanism.
Main Results:
- AE-CoNDA demonstrated a low overpotential (260 mV) and Tafel slope (62 mV dec-1) with excellent stability (>100 h).
- Integration of AE-CoNDA onto BiVO4 resulted in a photocurrent density of 4.3 mA cm-2 at 1.23 V.
- Experimental and theoretical studies revealed that stretched Co-O bonds optimize orbital hybridization and intermediate adsorption, enhancing catalytic activity.
Conclusions:
- The bond length adjustment strategy effectively optimizes MOFs for highly efficient water splitting.
- AE-CoNDA shows significant potential as a robust and active electrocatalyst for water splitting applications.
- Understanding the role of bond length in MOF structure is key to designing advanced catalysts for renewable energy.
