Электрохимические характеристики MnO2/С-электродов в нейтральных водных электролитах

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Abstract

Модификацию поверхности угольных электродов наночастицами диоксида марганца проводили методом анодного электрохимического осаждения. Структурные характеристики и элементный состав MnO2/С  изучены методами энергодисперсионного микроанализа, просвечивающей электронной микроскопии. Электрохимические характеристики электродов исследованы методами циклической вольтамперометрии, гальваностатического заряда-разряда и импедансной спектроскопии. Проведено сравнение удельной емкости электродов MnO2/С в 0,5 М растворах Li2SO4, Na2SO4 и K2SO4. Установлено, что большие значения удельной емкости полученных материалов реализуются в растворе сульфата натрия.

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В. В. Чернявина

Южный федеральный университет

Author for correspondence.
Email: vchernyavina@yandex.ru
Russian Federation, 344006, Ростов-на-Дону, ул. Б. Садовая, 105/42

А. Г. Бережная

Южный федеральный университет

Email: vchernyavina@yandex.ru
Russian Federation, 344006, Ростов-на-Дону, ул. Б. Садовая, 105/42

Я. А. Дышловая

Южный федеральный университет

Email: vchernyavina@yandex.ru
Russian Federation, 344006, Ростов-на-Дону, ул. Б. Садовая, 105/42

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2. Fig. 1. SEM images and EDX spectra for C electrodes (a, b) and MnO2/C composite (c, d).

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3. Fig. 2. SEM images of the MnO2/C material.

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4. Fig. 3. Cyclic voltammetric curves taken at the carbon electrode and MnO2/C in 0.5 M Li2SO4, Na2SO4, and K2SO4 solutions at a sweep rate of 5 mV/s.

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5. Fig. 4. Galvanostatic charge-discharge curves for the carbon and MnO2/C electrodes obtained at Iud = 0.4 A/g in 0.5 M solutions of Li2SO4, Na2SO4, and K2SO4.

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6. Fig. 5. Nyquist plots obtained for MnO2/C electrodes at 50 mHz - 500 KHz in 1M solutions of Li2SO4, Na2SO4, and K2SO4.

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