Volume 46, Issue 4 pp. 4935-4946
RESEARCH ARTICLE

Mesoporous carbon hollow sphere with dandelion-like radial-hierarchy for high-performance supercapacitors

Soyul Kwak

Soyul Kwak

School of Chemical Engineering and Materials Science, Department of Intelligent Energy and Industry, Department of Advanced Materials Engineering, Chung-Ang University, Seoul, Republic of Korea

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Hojong Eom

Hojong Eom

School of Chemical Engineering and Materials Science, Department of Intelligent Energy and Industry, Department of Advanced Materials Engineering, Chung-Ang University, Seoul, Republic of Korea

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Jihyeon Kang

Jihyeon Kang

School of Chemical Engineering and Materials Science, Department of Intelligent Energy and Industry, Department of Advanced Materials Engineering, Chung-Ang University, Seoul, Republic of Korea

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Seohyeon Jang

Seohyeon Jang

School of Chemical Engineering and Materials Science, Department of Intelligent Energy and Industry, Department of Advanced Materials Engineering, Chung-Ang University, Seoul, Republic of Korea

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Seyoung Choi

Seyoung Choi

School of Chemical Engineering and Materials Science, Department of Intelligent Energy and Industry, Department of Advanced Materials Engineering, Chung-Ang University, Seoul, Republic of Korea

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Ohhyun Kwon

Ohhyun Kwon

School of Chemical Engineering and Materials Science, Department of Intelligent Energy and Industry, Department of Advanced Materials Engineering, Chung-Ang University, Seoul, Republic of Korea

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Tae Yong Kim

Tae Yong Kim

Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California, USA

Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk 37673, Republic of Korea

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Inho Nam

Corresponding Author

Inho Nam

School of Chemical Engineering and Materials Science, Department of Intelligent Energy and Industry, Department of Advanced Materials Engineering, Chung-Ang University, Seoul, Republic of Korea

Correspondence

Inho Nam, School of Chemical Engineering and Materials Science, Department of Intelligent Energy and Industry, Department of Advanced Materials Engineering, Chung-Ang University, Seoul 06974, Republic of Korea.

Email: [email protected]

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First published: 15 November 2021
Citations: 8

Soyul Kwak and Hojong Eom contributed equally to this study.

Funding information: Korea Electric Power Corporation, Grant/Award Number: R21XO01-24; Korea Institute of Energy Technology Evaluation and Planning, Grant/Award Number: 20214000000280

Summary

Ordered mesoporous carbons (OMCs) possess great advantages, such as large surface area, uniform pore distribution, high porosity, and physical and chemical stability. However, the monotonic and long porous channels in OMCs hinder their further application, especially in energy storage. Here, we synthesized mesoporous carbon hollow spheres (MCHSs) with a “Dual-templating method” using dandelion-like silica spheres (DSSs) as the template. Through the dual-templating method, the MCHSs directly replicated the mesoporous edge of DSSs as a thick mesoporous shell but substituted the clogged central core with hollow-core. The combined structure with mesoporous carbon spheres and hollow-core has various advantages over conventional OMCs. The radial and hierarchical pores in the sphere provide a large surface area (1319 m2 g−1), short diffusion path, and open-pore that facilitates ion transfer to any direction. Simultaneously, the hollow sphere carved in the center of the MCHSs allows space for the improvement of ion mobility and electrolyte retention. Also, the dense structure of the MCHSs allows more compact packing and high tap density when MCHSs were applied as an electrode. The MCHSs exhibit high specific capacitance and present a well-developed EDLC shape at all scan rates (10 to 1000 mV s−1), the results show a superior electrochemical performance compared with other recent mesoporous carbon allotropes.

CONFLICT OF INTEREST

The authors declare that they have no conflict of interest.

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