Heterostructure-induced interfacial charge transfer interaction in CoS/CoO@NAC nanosheets as a bi-functional electrocatalyst for water-splitting application

R. Thangamathi, Natesan Kumaresan, M. Praveen Kumar, R. V. Mangalaraja, Francisco V. Herrera Diaz, Saeed Farhang Sahlevani, Tatianne Ferreira de Oliveira, Durga Prasad Pabba, P. Sivakumar

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, bi-functional electrocatalytic materials have the potential for both the hydrogen evaluation reaction (HER) and oxygen evaluation reaction (OER) in the alkaline medium. In the present investigation, the cobalt sulfide/cobalt oxide hanged on the nitrogen-doped activated carbon nanosheets (CoS/CoO@NAC) as nanocomposites were synthesized through the hydrothermal and then the carbonization processes. The X-ray diffraction peaks observed in the CoS/CoO@NAC nanocomposites revealed the presence of CoS, CoO, and N-doped activated carbon nanosheets which confirmed the formation of binary nanocomposites. The BET analysis of CoS/CoO@NAC nanocomposites resulted an enhancement of the surface area of about 1038.57 m2/g along with the pore size and pore volume of 3.23 nm and 0.442 cc/g, respectively. The CoS/CoO@NAC, nanocomposites were used for bi-functional catalysis which divulged the low over potential for both HER and OER analyses at about −0.266 V and 0.199 V vs. RHE, respectively at 10 mA/cm2 current density in the alkaline medium.

Original languageEnglish
Pages (from-to)69-79
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume64
DOIs
StatePublished - 25 Apr 2024
Externally publishedYes

Keywords

  • Bi-functional catalysis
  • Heterostructure
  • Hydrothermal
  • Interface engineering
  • Water-splitting

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