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Ir-Doped Co(OH)2 nanosheets as an efficient electrocatalyst for the oxygen evolution reaction
Yihao Gao1, Jie Bai1, Tianning Zhou1
1School of Chemical Engineering and Technology, North University of China, Taiyuan, Shanxi, 030051, China. gyq@nuc.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|May 27, 2022
Summary
This study developed a novel electrocatalyst using ZIF-67 grown on nickel foam, enhancing conductivity and stability for oxygen evolution reactions (OER). The resulting material shows excellent performance in alkaline conditions.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Cobalt-based metal-organic frameworks (Co-MOFs) offer high surface area and porosity but suffer from poor conductivity and stability.
- These limitations hinder their application as electrocatalysts, particularly for oxygen evolution reactions (OER).
Purpose of the Study:
- To develop a highly conductive and stable MOF-derived electrocatalyst for efficient OER.
- To overcome the intrinsic limitations of Co-MOFs in electrocatalytic applications.
Main Methods:
- Synthesized ZIF-67 on nickel foam via a room temperature soaking method.
- Assembled Ir-Co(OH)2@ZIF-67/NF nanosheets using a hydrothermal method.
- Characterized the material's electrochemical properties, including conductivity, active surface area, and electron transport.
Main Results:
- The Ir-Co(OH)2@ZIF-67/NF nanosheets demonstrated significantly improved electrical conductivity and electrochemical active surface area.
- Achieved ultralow overpotentials of 198 mV, 263 mV, and 300 mV at current densities of 10, 50, and 100 mA cm−2, respectively.
- Exhibited remarkable stability with no degradation observed at 10 mA cm−2 for approximately 16 hours.
Conclusions:
- The developed Ir-Co(OH)2@ZIF-67/NF material is a promising electrocatalyst for OER in alkaline media.
- This work presents a viable strategy for creating high-performance MOF-derived electrocatalysts.
- The enhanced conductivity and stability address key challenges in MOF-based electrocatalysis.
