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Synthesis of Zeolites Using the ADOR Assembly-Disassembly-Organization-Reassembly Route
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Synthesis and Optimization of Zeolitic Imidazolate Frameworks for the Oxygen Evolution Reaction
Juntao Li1, Srinivas Gadipelli1,2,3
1Department of Chemistry, University College London, London, WC1H 0AJ, UK.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 27, 2020
Summary
Zeolitic imidazolate frameworks (ZIFs) offer high oxygen evolution reaction (OER) performance without high-temperature treatment. Bimetallic ZIFs and ZIF-67/carbon black composites show enhanced OER activity and durability.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Metal-organic frameworks (MOFs) and zeolitic imidazolate frameworks (ZIFs) are explored for electrocatalysis.
- Post-synthesis modification of MOFs/ZIFs yields nanostructures like oxides, hydroxides, and carbons.
Purpose of the Study:
- To investigate the oxygen evolution reaction (OER) performance of bimetallic Zn-Co ZIFs.
- To achieve high and durable OER activity without high-temperature calcination or carbonization.
Main Methods:
- Synthesis of bimetallic Zn100-x Cox -ZIF samples at ambient conditions.
- Tuning ZIF-67 particle size and creating ZIF-67/carbon black composites.
- Electrocatalytic testing in 1.0 M KOH electrolyte.
Main Results:
- Bimetallic ZIFs exhibit improved OER activity with increasing cobalt concentration.
- ZIF-67 polyhedrons with particle sizes <200 nm show enhanced OER activity.
- ZIF-67/carbon black achieved >50% increased OER activity with a low overpotential (~320 mV).
- Optimized ZIF-67 demonstrated sustained activity and durability over 24 hours.
Conclusions:
- Bimetallic ZIFs provide a scalable route for efficient OER electrocatalysts.
- In situ formation of cobalt oxide/oxyhydroxide nanophases contributes to enhanced activity and durability.
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