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Two-Dimensional Cobalt Coordination Polymers Based on Anionic Modulation and Application in Supercapacitors.

Zhao-Ting Shang1, Yu-Juan Xie1, Dandan Chen1

  • 1College of Optoelectronic Materials and Technology, Key Laboratory of Flexible Optoelectronic Materials & Technology, Ministry of Education, Jianghan University, Wuhan, Hubei 430056, China.

Inorganic Chemistry
|September 22, 2025
PubMed
Summary
This summary is machine-generated.

Researchers used pseudohalide anions to control the morphology of 2D Coordination Polymers (CPs) for supercapacitors. This led to uniform lamellar structures with enhanced electrochemical energy storage performance and stability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Supercapacitors are vital for energy storage due to their fast charge/discharge, high power density, and long cycle life.
  • Two-dimensional (2D) Coordination Polymers (CPs) show great promise for electrochemical energy storage applications.
  • Controlling the morphology of 2D CPs is crucial but challenging for optimizing their performance.

Purpose of the Study:

  • To investigate the use of pseudohalide anions (SeCN-, SCN-) as crystal growth modifiers for precise morphological control of 2D CPs.
  • To enhance the electrochemical energy storage capabilities of 2D CPs by achieving uniform lamellar structures.
  • To explore the synergistic effects of generated Co(OH)2 during cycling for improved supercapacitor performance.

Main Methods:

  • Utilized pseudohalide anions (SeCN-, SCN-) to direct the crystal growth of 2D Coordination Polymers.
  • Synthesized and characterized uniform lamellar Co-CP-Se structures.
  • Fabricated and tested a hybrid supercapacitor device (Co-CP-Se//AC) for electrochemical performance evaluation.

Main Results:

  • The use of SeCN- facilitated the formation of uniform lamellar 2D CP structures due to its large atomic radius and high polarizability.
  • Co-CP-Se achieved a high specific capacitance of 1483 F g-1 at 1 A g-1 and excellent cycling stability (93.23% retention after 5000 cycles at 10 A g-1).
  • The hybrid supercapacitor (Co-CP-Se//AC) delivered a power density of 750 W kg-1 at an energy density of 42.14 Wh kg-1 with 90.12% capacitance retention after 5000 cycles.

Conclusions:

  • Precise morphological control of 2D CPs can be achieved using pseudohalide anions as crystal growth modifiers.
  • The uniform lamellar architecture significantly enhances electrolyte-electrode interface contact, leading to superior supercapacitor performance.
  • The synergistic contribution of in-situ generated Co(OH)2 alongside Co-CP-Se is key to the enhanced capacitance, offering insights for designing high-performance 2D CPs for energy storage.