TY - JOUR

T1 - Supercapacitor behavior of carbon-manganese oxides nanocomposites synthesized by carbon arc

AU - Iurchenkova, Anna A.

AU - Fedorovskaya, Ekaterina O.

AU - Matochkin, Pavel E.

AU - Sakhapov, Salavat Z.

AU - Smovzh, Dmitriy V.

PY - 2020/10/25

Y1 - 2020/10/25

N2 - The Mn-C-O composites were synthesized by the electric-arc discharge method. The composite materials were obtained by spraying of graphite electrode with the addition of MnO2. The morphology of Mn-C-O composites formed during electric-arc spraying of metal-carbon electrodes in various buffer gases (N2 and He) and the effect of their subsequent annealing in an oxygen-containing atmosphere was studied. It was experimentally determined that MnOx (MnO, Mn3O4) nanoparticles are mainly formed in N2 atmosphere, and Mn7C3 carbide nanoparticles are formed in He atmosphere. This phenomenon is explained by different cooling rates of the formed composites. With further annealing of materials, partial oxidation of nanoparticles and graphitization of the carbon matrix occur due to the thermal effect of the oxidation reaction. According to the study of electrochemical activity of materials in the 1 M KOH aqueous electrolyte, the materials with a higher MnO content and a higher degree of soot graphitization have the highest electrochemical capacity of 135 Fg−1.

AB - The Mn-C-O composites were synthesized by the electric-arc discharge method. The composite materials were obtained by spraying of graphite electrode with the addition of MnO2. The morphology of Mn-C-O composites formed during electric-arc spraying of metal-carbon electrodes in various buffer gases (N2 and He) and the effect of their subsequent annealing in an oxygen-containing atmosphere was studied. It was experimentally determined that MnOx (MnO, Mn3O4) nanoparticles are mainly formed in N2 atmosphere, and Mn7C3 carbide nanoparticles are formed in He atmosphere. This phenomenon is explained by different cooling rates of the formed composites. With further annealing of materials, partial oxidation of nanoparticles and graphitization of the carbon matrix occur due to the thermal effect of the oxidation reaction. According to the study of electrochemical activity of materials in the 1 M KOH aqueous electrolyte, the materials with a higher MnO content and a higher degree of soot graphitization have the highest electrochemical capacity of 135 Fg−1.

KW - arc discharge

KW - graphene

KW - Mn-C composites

KW - nanocarbon

KW - supercapacitor

KW - MNO2

KW - ELECTRODE MATERIALS

KW - PERFORMANCE

KW - RAMAN-SPECTROSCOPY

KW - CHARGE STORAGE MECHANISM

KW - SYNTHETIC ROUTE

KW - ELECTROCHEMICAL CAPACITANCE

KW - MN3O4 NANOPARTICLES

KW - DISCHARGE

KW - FEW-LAYERED GRAPHENE

UR - http://www.scopus.com/inward/record.url?scp=85088566167&partnerID=8YFLogxK

U2 - 10.1002/er.5721

DO - 10.1002/er.5721

M3 - Article

AN - SCOPUS:85088566167

VL - 44

SP - 10754

EP - 10767

JO - International Journal of Energy Research

JF - International Journal of Energy Research

SN - 0363-907X

IS - 13

ER -