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Surface restructuring Prussian blue analog-derived bimetallic CoFe phosphides by N-doped graphene quantum dots for
Wei-Shiang Lin1, Mia Rinawati1, Wei-Hsiang Huang2
1Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
Journal of Colloid and Interface Science
|October 21, 2023
Summary
Engineered N-doped graphene quantum dots on cobalt iron phosphide enhance hydrogen evolution reaction (HER) catalysis. This novel catalyst offers a durable and efficient alternative to platinum for electrochemical water splitting and hydrogen generation.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- The hydrogen evolution reaction (HER) is critical for electrochemical water splitting.
- Platinum-based catalysts are effective but expensive for HER.
- Transition metal phosphides (TMPs) are promising alternatives, but their performance needs improvement.
Purpose of the Study:
- To develop an efficient and durable catalyst for HER.
- To investigate the effect of N-doped graphene quantum dots (NGQD) on bimetallic cobalt iron phosphide (CoFeP) for HER.
- To provide a viable alternative to platinum catalysts in water splitting.
Main Methods:
- Synthesis of bimetallic CoFeP from cobalt iron Prussian blue analogue (CoFePBA).
- Engineering N-doped graphene quantum dots (NGQD) onto the CoFeP surface.
- Electrochemical characterization, including overpotential and stability tests.
- X-ray absorption spectroscopy (XAS) to analyze electronic structure.
Main Results:
- The optimized NGQD/CoFeP catalyst exhibited an overpotential of 70 mV at 10 mA cm⁻² in 0.5 M H₂SO₄.
- The catalyst demonstrated exceptional stability, maintaining performance at 600 mA cm⁻² for 12 hours.
- XAS confirmed that NGQD introduction altered the electronic state of Co atoms, enhancing conductivity and electroactivity.
Conclusions:
- NGQD/CoFeP is a highly efficient and stable electrocatalyst for HER.
- The engineered catalyst shows potential as a cost-effective alternative to platinum for commercial water splitting.
- Surface modification with NGQD is a critical strategy for enhancing TMP catalytic performance.
