Na+ ion migration on the surface of reduced graphene oxide

被引：1
作者：
Banerjee, Moutusi [1 ]
Chakravorty, Dipankar [2 ]
Saha, Shyamal K. [1 ]
机构：
[1] Indian Assoc Cultivat Sci, Dept Mat Sci, Kolkata 700032, India
[2] Indian Assoc Cultivat Sci, MLS Prof Unit, Kolkata 700032, India
来源：
JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2018年 / 51卷 / 32期
关键词：
reduced graphene oxide; sodium ion conductor; relaxation; activation energy; FUNCTIONALIZED GRAPHENE; BATTERIES; INTERCALATION; CHEMISTRY;
D O I：
10.1088/1361-6463/aacfbf
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The increasing demand of soditum ion batteries (SIBs) remarkably accelerates the study of solid-state sodium ion conductors due to their potential application as solid-state electrolytes in SIBs. In the present work, the sodium ion is attached to reduced graphene oxide (rGO) to realize a soditum ion conductor. Tuning the activation energy of migration for Na+ and Li+ ions on rGO surface is investigated by varying the concentration of both ions. The lowest values of activation energies for Na+ and Li+ conduction are found to be 0.28 eV and 0.37 eV, respectively. It is seen that the activation energy of migration of the Na+ ion is smaller than that of the Li+ ion. The lower positive charge density of Na+ compared to Li+ causes this lowering of activation energy in Na+ due to the comparatively weak cation-pi interaction between the Na+ ion and the carbon hexagon. From the relaxation study, the relaxation exponent (beta) value of the Na+ ion is found to be smaller than that of the Li+ ion. This deviation from Debye-type relaxation behavior of the Na+ ion also agrees well with the decreasing value of activation energy as mentioned above. We hope that this study will aid the design of ion conductors for solid-state SIBs.
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页数：7
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