Title

Template-Free Electrodeposition of Freestanding MnO₂ Nanowires and their Pseudo-Capacitive Properties

Presenter Information

Matthew Willmering

Department

Chemistry

Major

Chemistry

Research Advisor

Switzer, Jay A., 1950-

Advisor's Department

Chemistry

Funding Source

Missouri S&T Opportunities for Undergraduate Research Experiences (OURE) Program; Department of Energy - Grant No. DE-FG02-08ER46518

Abstract

Freestanding MnO2 nanowires were synthesized via a novel, template-free galvanostatic deposition from an aqueous Mn(II)(acetate) electrolyte at elevated temperatures. The influence of the deposition parameters on the morphology, crystal structure and specific capacity was investigated. The crystal structure was unaffected by the deposition parameters. The wire size and morphology strongly depend on the deposition parameters. The substrate significantly affects the nanowire size. The current density has a predominant influence on the morphology and porosity. The electrolyte temperature has a profound influence on the nucleation and early stages of growth phenomena. The specific capacity of the nanowires was investigated in 1 M Na2SO4 solution and the specific capacity of 309 F g-1 was reached. Although, this method requires further optimization of synthesis parameters, it shows a great potential of manufacturing large scale MnO2 based positive electrodes for super-capacitors.

Biography

Matthew graduated as Valedictorian from Mehlville High School in St. Louis in May 2008. He continued his education at Missouri University of Science and Technology in order to obtain a B.S. in Chemistry. He will be graduating in May 2012 from Missouri S&T and will be attending graduate school in order to obtain a Ph.D.

Research Category

Sciences

Presentation Type

Oral Presentation

Document Type

Presentation

Award

Sciences oral presentation, Second place

Location

Turner Room

Presentation Date

10 Apr 2012, 11:00 am - 11:30 am

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Apr 10th, 11:00 AM Apr 10th, 11:30 AM

Template-Free Electrodeposition of Freestanding MnO₂ Nanowires and their Pseudo-Capacitive Properties

Turner Room

Freestanding MnO2 nanowires were synthesized via a novel, template-free galvanostatic deposition from an aqueous Mn(II)(acetate) electrolyte at elevated temperatures. The influence of the deposition parameters on the morphology, crystal structure and specific capacity was investigated. The crystal structure was unaffected by the deposition parameters. The wire size and morphology strongly depend on the deposition parameters. The substrate significantly affects the nanowire size. The current density has a predominant influence on the morphology and porosity. The electrolyte temperature has a profound influence on the nucleation and early stages of growth phenomena. The specific capacity of the nanowires was investigated in 1 M Na2SO4 solution and the specific capacity of 309 F g-1 was reached. Although, this method requires further optimization of synthesis parameters, it shows a great potential of manufacturing large scale MnO2 based positive electrodes for super-capacitors.