| Autor: |
CHEN Xiang, YAN Shao-jiu, WANG Nan, PENG Si-kan, WANG Chen, WU Guang-ming, DAI Sheng-long |
| Jazyk: |
čínština |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Cailiao gongcheng, Vol 47, Iss 2, Pp 49-55 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
1001-4381 |
| DOI: |
10.11868/j.issn.1001-4381.2017.000499 |
| Popis: |
Two types of ultrathin-flaky δ-MnO2 electrode materials (denoted as δ-MnO2-A and δ-MnO2-B) were synthesized through the reduction of potassium permanganate with manganese acetate and ethanol separately.The crystalline structure,chemical component,microstructure and pore size distribution of these nano-materials were determined by XRD,XPS,SEM/TEM and BET analysis.The electrochemical test demonstrates two δ-MnO2 electrode materials own similar specific capacitance and rate capability.Comparing to δ-MnO2-A,however,electrode material δ-MnO2-B contains a higher potassium and manganese vacancy content,and the lamellar structure of δ-MnO2-B is more legible and stable,therefore it displays a much more superior cycling stability.In 0.5mol/L Na2SO4 electrolyte,the specific capacitance of δ-MnO2 reaches 227F·g-1(1mV·s-1) and the capacitance retention rate is achieved 87.6% after 5000 cycles at 100mV·s-1. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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