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Hierarchically Structured Two-Dimensional Bimetallic CoNi-Hexaaminobenzene Coordination Polymers Derived from Co(OH)2
Chun Li1, Yanting Gao1, Xifeng Xia1
1Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology, Nanjing, 210094, China.
Small (Weinheim an Der Bergstrasse, Germany)
|February 1, 2020
Summary
A new 2D bimetallic cobalt-nickel coordination polymer (CP) electrode shows excellent performance for the oxygen evolution reaction (OER). This self-supported electrode offers enhanced conductivity and stability for future electronic devices.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Conjugated coordination polymers (CPs) are attractive due to their tunable structures.
- Poor electrical conductivity and stability limit their use in electronic devices.
- Developing efficient electrodes for oxygen evolution reaction (OER) is crucial for energy applications.
Purpose of the Study:
- To design and synthesize a novel hierarchically structured 2D bimetallic CoNi-CP.
- To evaluate its performance as a self-supported electrode for OER.
- To investigate the synergistic effects of cobalt and nickel for improved electrocatalysis.
Main Methods:
- Synthesis of a 2D bimetallic CoNi-hexaaminobenzene CP derived from Co(OH)2.
- Fabrication of a self-supported electrode using the synthesized CP.
- Electrochemical characterization including OER performance testing and durability studies.
- Density functional theory (DFT) computations to understand catalytic mechanisms.
Main Results:
- The CoNi-CP electrode exhibited a high electrochemical surface area and intrinsic activity.
- It delivered a low overpotential of 219 mV at 10 mA cm-2 and a Tafel slope of 42 mV dec-1.
- The electrode demonstrated excellent durability, retaining 91.3% of its current density after 24 hours.
- DFT calculations confirmed the significant synergistic effect between Co and Ni in enhancing OER.
Conclusions:
- The hierarchically structured 2D bimetallic CoNi-CP serves as an efficient self-supported OER electrode.
- This material overcomes limitations of conductivity and stability in traditional CPs.
- The findings provide a strategy for developing advanced electrocatalysts and promote CPs in electrocatalysis.
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