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Controlled Synthesis of Manganese Oxyhydroxide Nanotubes: Implications for High‐Efficiency Supercapacitors
Author(s) -
Tan Hui Teng,
Rui Xianhong,
Shi Wenhui,
Xu Chen,
Yu Hong,
Hoster Harry E.,
Yan Qingyu
Publication year - 2013
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201300095
Subject(s) - supercapacitor , electrolyte , materials science , electrochemistry , capacitance , manganese , electrode , energy storage , nanotechnology , power density , conductivity , chemical engineering , nanotube , graphite , composite material , carbon nanotube , chemistry , power (physics) , metallurgy , physics , quantum mechanics , engineering
Successful attempts have been made to control the synthesis of tubular MnOOH with nanodimensions on high electronic conductivity graphite felt (GF) to be used as a flexible supercapacitor electrode. As a fundamental study, the time‐dependent kinetics was investigated to interpret its formation mechanism, which can be depicted as the curling of a two‐dimensional precursor into a one‐dimensional structure with a hollow interior. As a result of the nanotube structure, the active surface area of MnOOH is completely accessible to electrolyte ions and has a shorter charge‐transport length and greater ability to withstand structural deformation. Hence, hollow‐structured MnOOH shows great promise as an electrochemical system, which is reflected in its high specific capacitance of 1156 F g −1 at 1 A g −1 . Furthermore, the high energy density of 1125 W h kg −1 and power density of 5.05 kW kg −1 reveal the outstanding energy‐storage behavior of the MnOOH/GF composites as flexible supercapacitor electrodes.