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Intercalation-Induced Irreversible Lattice Distortion in Layered Double Hydroxides
Deok Ki Cho1, Hyun Woo Lim1, Andi Haryanto2
1Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
ACS Nano
|July 22, 2024
Summary
Introducing lattice strain in nickel-iron layered double hydroxides (NiFe LDHs) enhances oxygen evolution reaction (OER) electrocatalyst activity. A boron tungstate anion intercalation method induces irreversible lattice distortion, stabilizing the active phase and boosting performance.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Lattice strain is a key factor in enhancing electrocatalyst activity by tuning electronic structure and intermediate binding energies.
- Nickel-iron layered double hydroxides (NiFe LDHs) are effective electrocatalysts for the oxygen evolution reaction (OER).
- The reversible transformation between distorted β-NiOOH and undistorted γ-NiOOH phases limits the long-term OER activity of NiFe LDHs.
Purpose of the Study:
- To develop a method for inducing irreversible lattice distortion in NiFe LDHs to enhance OER activity and stability.
- To investigate the mechanism by which lattice distortion impacts the electronic structure and phase stability of NiFe LDHs during OER.
- To demonstrate the potential of lattice strain engineering as a general strategy for improving electrocatalyst performance.
Main Methods:
- Boron tungstate (BWO) anion intercalation into NiFe LDHs.
- Electrochemical characterization of oxygen evolution reaction (OER) activity, including overpotential and Tafel slope measurements.
- In situ Raman spectroscopy to monitor phase transformations under OER conditions.
Main Results:
- The boron tungstate anion intercalation method successfully induced irreversible lattice distortion in NiFe LDHs (D-NiFe LDHs).
- D-NiFe LDHs exhibited significantly enhanced OER activity with low overpotentials (209 mV at 10 mA cm-2 and 276 mV at 500 mA cm-2) and a Tafel slope of 33.4 mV dec-1.
- In situ Raman spectroscopy confirmed the stabilization of the active β-NiOOH phase in D-NiFe LDHs under OER conditions, and the material showed excellent stability for 50 hours at 500 mA cm-2.
Conclusions:
- Irreversible lattice distortion, induced by BWO anion intercalation, effectively enhances the OER activity and stability of NiFe LDHs.
- The strategy of intercalation-induced lattice strain provides a general approach for designing high-performance electrocatalysts.
- Stabilizing the distorted β-NiOOH phase through lattice strain is crucial for achieving superior and durable OER performance.
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