Study on fabrication of MnO2/CNTs composite by electrolysis in neutral solution and its applicability as cathode materials in Mg‐ion batteries

Author:

Van Vy Uong12,Que Le Xuan12

Affiliation:

1. Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18, Hoang Quoc Viet, Cau Giay Hanoi 10000 Viet Nam

2. Institute for Tropical technology, Vietnam academy of Science and Technology 18, Hoang Quoc Viet, Cau Giay Hanoi 10000 Viet Nam

Abstract

AbstractEffects of electrolysis conditions such as Mn2+ ions, and CNTs concentration, temperature, and solution stirring on electrochemical precipitation of MnO2/CNTs composite on SS 304 stainless steel anode electrodes were studied by cyclic voltammetry (CV) method. Results show that the MnO2/CNTs was fabricated at the electrode potential was more positive than 0.8 V/SCE with a suitable solution composition of 0.5 M Na2SO4, 0.4 M MnSO4 and CNTs 0.2 g/L, at 80 oC, and stirring speed ranging from 100 to 200 rpm. The obtained MnO2/CNTs composite materials contained a crystalline phase of MnO2 akhtenskite. The presence of CNTs in the composite was observed by FESEM image. Electrochemical properties of the MnO2/CNTs composites were studied by CV method and galvanostatic charge‐discharge. The composite materials have good discharge capacity, its specific capacity was 92 mAh/g, after 35 charge‐discharge cycles the specific capacity of the material decreased to 69.2 mAh/g, equal to 75 % of the first cycle.

Publisher

Wiley

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