期刊
ELECTROCHIMICA ACTA
卷 324, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.134867
关键词
Aqueous zinc ion batteries; Cathode; MnO2 submicrospheres; Hydronium ions insertion
资金
- National Natural Science Foundation of China [21601089, 21905140]
- Natural Science Foundation of Jiangsu Province [BK20160941]
- Startup Foundation for Introducing Talent of NUIST [2017r056]
- Jiangsu province Double Plan, College Students's Practice Innovation Training Program of NUIST [1391131901008]
beta-MnO2 and delta-MnO2 submicrospheres with different crystallographic forms were parallelly synthesized via a facile way using MnCO3 submicrospheres as manganese source and template. Fine observation enclosed that the beta-MnO2 and delta-MnO2 submicrospheres were composed of nanoparticles and nanosheets respectively. The performances of these samples as cathode for aqueous zinc ion batteries were investigated: the prepared beta-MnO2 and delta-MnO2 submicrospheres exhibit an initial capacity of 100 and 126 mAh/g and preserve about 99% and 81% of their original capacity over 100 cycles at a current density of 100 mA/g, respectively. It is observed from the galvanostatic charge/discharge profiles that the majority of excess capacity for delta-MnO2 than beta-MnO2 is contributed by the first discharge step referred to H+ insertion process, as delta-MnO2 has lower charge transfer resistance and larger diffusion coefficient than beta-MnO2. We ascribe this to the larger layer space of delta-MnO2 which would benefit for the easily insertion/ extraction of hydronium ions. For contrast, the delta-MnO2 encounters a sluggish transportation of hydronium ion along with the breaking of H-H2O bond during ion inserting. (C) 2019 Elsevier Ltd. All rights reserved.
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