DataVXACS Applied Energy MaterialsPaper
journal article·2019-02-25

Low-Charge-Carrier-Scattering Three-Dimensional α-MnO2/β-MnO2 Networks for Ultra-High-Rate Asymmetrical Supercapacitors

Shijin Zhu, Tian Wang, Xiaoying Liu, Yuxin Zhang, Fei Li, Fan Dong, Han Zhang, Lili Zhang

ACS Applied Energy Materials· Volume 2· Issue 2
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Source abstract

Abstract

The excessive concern over the energy density of supercapacitors is changing their applied direction while the power density is always overlooked. Supercapacitors should be considered as a high-power energy device rather than a neither fish nor fowl energy device. Herein, an ultrafine α-MnO2 needle was formed on β-MnO2 networks, not distributed randomly, but standing on the surface of β-MnO2 vertically forming an array structure with low-charge-carrier scattering. These novel structures possess a rational arrangement of the needles resulting in high capacitance (278.2 F g–1 for α-MnO2/β-MnO2 networks) and excellent rate capability (41.0% remaining with the specific current increased from 0.25 to 64.0 A g–1). Asymmetrical supercapacitors fabricated by reduced graphene oxide (RGO) as the anode and as-prepared structures as the cathode deliver excellent electrochemical performance. Specifically, the devices give a favorable specific energy (29.8 W h kg–1) considering the weight of α-MnO2/β-MnO2 and reduced graphene oxide (RGO) as well as ultrahigh specific power (64.0 kW kg–1) and excellent cyclic stability (>95% of initial capacitance remained after 10 000 cycles). This work opens new avenues for promoting high-power asymmetrical supercapacitors.
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Research context

Energy storageNanomaterials

OpenAlex topics: Supercapacitor Materials and Fabrication · Advancements in Battery Materials · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P. R. China

Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, P. R. China

Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, P. R. China

Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of OptoelectronicEngineering, Shenzhen University, Shenzhen 518060, P. R. China

Institute of Chemical and Engineering Sciences (ICES), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island 62783, Singapore

Funding

Chongqing Municipal Education Commission · Ministry of Education of the People's Republic of China · National Natural Science Foundation of China · Innovative Research Team of Chongqing · Chongqing Special Postdoctoral Science Foundation

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