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Hierarchical Cu(OH)2@MnO2 core-shell nanorods array in situ generated on three-dimensional copper foam for
Huining Wang1, Guowen Yan1, Xueying Cao1
1College of Material Science and Engineering, Institute for Graphene Applied Technology Innovation, Collaborative Innovation Centre for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Qingdao University, Qingdao 266071, Shandong, China.
We developed a hierarchical copper hydroxide@manganese dioxide (Cu(OH)2@MnO2) nanorod array on copper foam for supercapacitors. This design enhances electrical conductivity and energy storage, enabling a device to power an LED for over fifteen minutes.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Manganese dioxide (MnO2) is a promising supercapacitor material due to its high capacity, abundance, and low cost.
- Poor electrical conductivity of MnO2 hinders its practical application in energy storage devices.
Purpose of the Study:
- To enhance the electrochemical performance of MnO2 by addressing its conductivity limitations.
- To develop a novel hierarchical nanostructure for improved supercapacitor electrodes.
Main Methods:
- Fabrication of a hierarchical Cu(OH)2@MnO2 core-shell nanorod array on copper foam (CF).
- Characterization of the nanostructure using relevant analytical techniques.
- Electrochemical testing of the fabricated electrode material in a supercapacitor configuration.
Main Results:
- The Cu(OH)2@MnO2/CF nanorod array exhibited excellent areal capacitance (708.62 mF cm-2 at 2 mA cm-2).
- An asymmetric supercapacitor (Cu(OH)2@MnO2/CF//activated carbon) achieved a high energy density of 18.36 Wh kg-1 at 750 W kg-1.
- The supercapacitor device demonstrated practical application by powering an LED for over 15 minutes.
Conclusions:
- The hierarchical Cu(OH)2@MnO2 core-shell nanostructure effectively improves MnO2-based supercapacitor performance.
- This nanostructure offers a viable pathway for developing high-performance and cost-effective energy storage solutions.
- The demonstrated device performance highlights the potential for practical applications in energy storage.
