کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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187546 | 459645 | 2012 | 9 صفحه PDF | دانلود رایگان |
Crystallized manganese dioxide powders (cryptomelane type α-MnO2 and birnessite type δ-MnO2) were electrochemically investigated in mild aqueous electrolytes with the cavity microelectrode (CME) technique. Cyclic voltammetry was performed with isolated MnO2 powder and mixed acetylene black/MnO2 powder. High electrochemical performance is achieved showing the pseudocapacitive behavior of cryptomelane and the birnessite signature, which is exhibited by large, intense and more defined peaks, than for a composite electrode. The microcavity electrode (about 10−3 mm3) allows studies with only a few micrograms of MnO2 powder in order to display its intrinsic electrochemical behavior and to improve the understanding of the role of the different components in the composite electrode performance.
Journal: Electrochimica Acta - Volume 86, 30 December 2012, Pages 268–276