Promising Electrocatalytic Water and Methanol Oxidation Reaction Activity by Nickel Doped Hematite/Surface Oxidized Carbon Nanotubes Composite Structures

Bibhudatta Malik, Sumit Majumder, Roberto Lorenzi, Ilana Perelshtein, Michal Ejgenberg, Alberto Paleari, Gilbert Daniel Nessim

Research output: Contribution to journalArticlepeer-review

Abstract

Tailoring the precise construction of non-precious metals and carbon-based heterogeneous catalysts for electrochemical oxygen evolution reaction (OER) and methanol oxidation reaction (MOR) is crucial for energy conversion applications. Herein, this work reports the composite of Ni doped Fe2O3 (Ni−Fe2O3) with mildly oxidized multi-walled CNT (O−CNT) as an outstanding Mott-Schottky catalyst for OER and MOR. O−CNT acts as a co-catalyst which effectively regulates the charge transfer in Ni−Fe2O3 and thus enhances the electrocatalytic performance. Ni−Fe2O3/O−CNT exhibits a low onset potential of 260 mV and overpotential 310 mV @ 10 mA cm−2 for oxygen evolution. Being a Mott-Schottky catalyst, it achieves the higher flat band potential of −1.15 V with the carrier density of 0.173×1024 cm−3. Further, in presence of 1 M CH3OH, it delivers the MOR current density of 10 mA cm−2 at 1.46 V vs. RHE. The excellent electrocatalytic OER and MOR activity of Ni−Fe2O3/O−CNT could be attributed to the synergistic interaction between Ni-doped Fe2O3 and O−CNT.

Original languageEnglish
Article numbere202200036
JournalChemPlusChem
Volume87
Issue number5
DOIs
StatePublished - May 2022

Keywords

  • Mott-Schottky catalysts
  • carbon nanotubes
  • electrochemistry
  • methanol oxidation reaction
  • oxygen evolution reaction

All Science Journal Classification (ASJC) codes

  • General Chemistry

Fingerprint

Dive into the research topics of 'Promising Electrocatalytic Water and Methanol Oxidation Reaction Activity by Nickel Doped Hematite/Surface Oxidized Carbon Nanotubes Composite Structures'. Together they form a unique fingerprint.

Cite this