TY - JOUR
T1 - Mesoporous MnO 2 synthesized by hydrothermal route for electrochemical supercapacitor studies
AU - Nayak, Prasant Kumar
AU - Munichandraiah, N.
PY - 2012/8
Y1 - 2012/8
N2 - Poorly crystalline mesoporous MnO 2, which is suitable for supercapacitor studies, is synthesized from neutral KMnO 4 aqueous solution by hydrothermal route. But it requires a high temperature (180 °C) and also a long reaction time (24 h). Addition of a tri-block copolymer, namely, poly(ethylene glycol)-block-poly(propylene glycol)-blockpoly( ethylene glycol) (P123), which is generally used as a soft template for the synthesis of nano-structured porous materials, reduces the hydrothermal temperature to 140 °C and also reaction time to 2 h. When the reaction time is increased, the product morphology changes from nanoparticles to nanorods with a concomitant decrease in BET surface area. Also, the product tends to attain crystallinity. The electrochemical capacitance properties of MnO 2 synthesized under varied hydrothermal conditions are studied in 0.1M Na 2SO 4 electrolyte. A specific capacitance of 193 Fg -1 is obtained for the mesoporous MnO 2 sample consisting of nanoparticle and nanorod mixed morphology synthesized in 6 h using P123 at 140 °C.
AB - Poorly crystalline mesoporous MnO 2, which is suitable for supercapacitor studies, is synthesized from neutral KMnO 4 aqueous solution by hydrothermal route. But it requires a high temperature (180 °C) and also a long reaction time (24 h). Addition of a tri-block copolymer, namely, poly(ethylene glycol)-block-poly(propylene glycol)-blockpoly( ethylene glycol) (P123), which is generally used as a soft template for the synthesis of nano-structured porous materials, reduces the hydrothermal temperature to 140 °C and also reaction time to 2 h. When the reaction time is increased, the product morphology changes from nanoparticles to nanorods with a concomitant decrease in BET surface area. Also, the product tends to attain crystallinity. The electrochemical capacitance properties of MnO 2 synthesized under varied hydrothermal conditions are studied in 0.1M Na 2SO 4 electrolyte. A specific capacitance of 193 Fg -1 is obtained for the mesoporous MnO 2 sample consisting of nanoparticle and nanorod mixed morphology synthesized in 6 h using P123 at 140 °C.
KW - Manganese dioxide
KW - Mesoporous
KW - Nanoparticles
KW - Nanorods
KW - Specific capacitance
KW - Surface area
UR - http://www.scopus.com/inward/record.url?scp=84865528924&partnerID=8YFLogxK
U2 - 10.1007/s10008-012-1693-8
DO - 10.1007/s10008-012-1693-8
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AN - SCOPUS:84865528924
SN - 1432-8488
VL - 16
SP - 2739
EP - 2749
JO - Journal of Solid State Electrochemistry
JF - Journal of Solid State Electrochemistry
IS - 8
ER -