Authors: D Vernardou A Kazas M Apostolopoulou N Katsarakis E Koudoumas
Publish Date: 2016/12/02
Volume: 46, Issue: 4, Pages: 2232-2240
Abstract
Hydrothermal growth of manganese dioxide MnO2 nanostructures was carried out on indium tin dioxide glass substrates at 95°C for 24 h to study the effect of cations such as K+ Li+ and Na+ on their properties It was observed that presence of cations affected the MnO2 phase and morphology amorphous MnO2 no cations showed columnarlike structure εMnO2 K+ presented nanowires αMnO2 Na+ was composed of agglomerates of spherical nanoparticles while βMnO2 Li+ consisted of spherical aggregates of nanoparticles The different electrochemical performance depending on the structure is expected to be useful for application in Liion batteries Asgrown εMnO2 exhibited lower charge resistance and higher ionic diffusion rate providing the electrode with enhanced specific discharge capacity of 910 mAh g−1 and capacity retention of 98 after 500 scans Hence K+ can support tunnel structures and stabilize the structure compared with the smaller cations Na+ and Li+
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