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Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators
Published on: April 25, 2020
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Push-Pull Interplay of Soft/Hard Magnetic Spin Junctions for High Performance Ammonium Ion Pseudo-Capacitors
Peeyush Pandey1, Mohammad Qureshi1
1Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India.
Small (Weinheim an Der Bergstrasse, Germany)
|March 26, 2026
Summary
This study introduces a novel push-pull spin control strategy using magnetic nanoparticles to enhance hybrid supercapacitor performance. This method boosts energy density and capacitance by optimizing interfacial charge transport.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Optimizing interfacial charge/mass transport is crucial for high-performance hybrid supercapacitors, balancing energy and power density.
- Current strategies often focus on material composition, but interfacial spin control offers a new avenue for enhancement.
- Magnetic interactions between distinct materials can influence electrode properties and charge-transfer dynamics.
Purpose of the Study:
- To investigate a push-pull spin control strategy at a soft/hard magnetic junction for improved supercapacitor electrodes.
- To explore the impact of magnetically induced spin ordering on interfacial charge transport and storage capabilities.
- To evaluate the performance enhancement of hybrid supercapacitors utilizing magnetically activated electrodes.
Main Methods:
- Fabrication of a hybrid electrode combining soft magnetic Co(1,4-benzenedicarboxylate) (CBDC) and hard magnetic MnFe2O4 (MFO) nanoparticles.
- Application of an external magnetic field to induce spin ordering in the CBDC layer via MFO nanoparticles.
- Electrochemical characterization of the CBDC-MFO@CSF electrode and assembly into a hybrid supercapacitor device.
Main Results:
- Specific capacitance increased from 612 to 1015 Fg−1 with magnetic activation.
- Capacitance retention improved from 30% to 50% over a 1.6 V operating range.
- Energy density of the hybrid device increased to 146 Whkg−1 (at 800 Wkg−1) compared to 81 Whkg−1 (at 798.4 Wkg−1) for the non-activated electrode.
Conclusions:
- Magnetically induced ferromagnetic ordering in the CBDC layer enhances charge storage by activating more Co2+ sites.
- The push-pull spin control strategy significantly improves interfacial charge/mass transport, leading to superior supercapacitor performance.
- This approach offers a viable pathway to boost energy density without compromising power output in hybrid supercapacitors.
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