Improving hydrogen evolution reaction and capacitive properties on CoS/MoS2 decorated carbon fibers

D. N. Sangeetha, D. Krishna Bhat, S. Senthil Kumar, M. Selvakumar

Research output: Contribution to journalArticle

Abstract

We report a facile method to transform abundantly dumped banana stem fibers into carbon fibers (CFs) useful for energy applications. The CFs surface area is increased by varying the quantity of KOH activation to 488 m2g-1. The solvothermal method is used to synthesize CoS, CoS/MoS2 and also grown on the activated carbon fibers (ACFs). Nano nodules of CoS arranged into sheets and layers of MoS2 stacked together were found in FESEM analysis. The morphology of the CoS/MoS2 differs when grown on ACFs. The growth of CoS/MoS2 along the ACFs length prevents any stacking of the pseudocapacitance materials. The ternary composite ACFs/CoS/MoS2 exhibits superior supercapacitor behavior as well as hydrogen evolution reaction (HER) due to the synergetic effect of the conducting ACF surface and redox active CoS/MoS2. A maximum specific capacitance of 733 Fg-1, energy and power density of 33 WhKg−1 and 999 WKg-1 respectively are obtained. A low Tafel slope value of 61 mVdec−1 is obtained for the ACFs/CoS/MoS2 ternary composite electrode. The present work therefore offers a fresh insight into the effective conversion of waste materials into electrode material for energy storage and conversion applications.

Original languageEnglish
JournalInternational Journal of Hydrogen Energy
DOIs
Publication statusAccepted/In press - 01-01-2019

Fingerprint

carbon fibers
Carbon fibers
activated carbon
Activated carbon
Hydrogen
hydrogen
Electrodes
composite materials
nodules
electrochemical capacitors
Composite materials
energy conversion
energy storage
electrode materials
Energy conversion
stems
Energy storage
radiant flux density
Capacitance
flux density

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

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abstract = "We report a facile method to transform abundantly dumped banana stem fibers into carbon fibers (CFs) useful for energy applications. The CFs surface area is increased by varying the quantity of KOH activation to 488 m2g-1. The solvothermal method is used to synthesize CoS, CoS/MoS2 and also grown on the activated carbon fibers (ACFs). Nano nodules of CoS arranged into sheets and layers of MoS2 stacked together were found in FESEM analysis. The morphology of the CoS/MoS2 differs when grown on ACFs. The growth of CoS/MoS2 along the ACFs length prevents any stacking of the pseudocapacitance materials. The ternary composite ACFs/CoS/MoS2 exhibits superior supercapacitor behavior as well as hydrogen evolution reaction (HER) due to the synergetic effect of the conducting ACF surface and redox active CoS/MoS2. A maximum specific capacitance of 733 Fg-1, energy and power density of 33 WhKg−1 and 999 WKg-1 respectively are obtained. A low Tafel slope value of 61 mVdec−1 is obtained for the ACFs/CoS/MoS2 ternary composite electrode. The present work therefore offers a fresh insight into the effective conversion of waste materials into electrode material for energy storage and conversion applications.",
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Improving hydrogen evolution reaction and capacitive properties on CoS/MoS2 decorated carbon fibers. / Sangeetha, D. N.; Krishna Bhat, D.; Senthil Kumar, S.; Selvakumar, M.

In: International Journal of Hydrogen Energy, 01.01.2019.

Research output: Contribution to journalArticle

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