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Insights on the Fundamental Capacitive Behavior: A Case Study of MnO 2
Author(s) -
Yan Jian,
Sumboja Afriyanti,
Wang Xu,
Fu Chaopeng,
Kumar Vipin,
Lee Pooi See
Publication year - 2014
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201303553
Subject(s) - capacitive sensing , materials science , supercapacitor , electrode , capacitance , electrolyte , porosity , nanotechnology , substrate (aquarium) , optoelectronics , chemical engineering , composite material , computer science , chemistry , oceanography , engineering , geology , operating system
In this work, an insightful study on the fundamental capacitive behavior of MnO 2 based electrodes is carried out using MnO 2 hierarchical spheres (MHSs) and MnO 2 nanoneedles (MNs) as examples. An overall understanding of the relationship between the capacitive performance and the electrode configuration as well as the morphology of active material, loading density, porosity of electrode, and electrolyte concentration is investigated comprehensively. Our analyses show that MnO 2 with thin structure is of advantage to increase the utility of active material and to deliver higher specific capacitance, as the faradic reaction happens at/near the surface. Creation of an efficient path for the transport of electrons and ions is crucial to achieve high rate capabilities. Cycling stability could be improved by suppressing the side reaction. It is also important to shed light on the charge contribution from a graphite paper (GP) substrate since it may cause a misinterpretation of the capacitive behavior. This study provides a comprehensive understanding on the fundamental capacitive behavior of MnO 2 based electrodes and gives useful clues for designing high performance supercapacitors.