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

Autor: Malik B; Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan, 52900, Israel., Majumder S; Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan, 52900, Israel., Lorenzi R; Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125, Milano, Italy., Perelshtein I; Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan, 52900, Israel., Ejgenberg M; Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan, 52900, Israel., Paleari A; Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125, Milano, Italy., Nessim GD; Department of Chemistry and Institute of Nanotechnology, Bar-Ilan University, Ramat Gan, 52900, Israel.
Jazyk: angličtina
Zdroj: ChemPlusChem [Chempluschem] 2022 May; Vol. 87 (5), pp. e202200036.
DOI: 10.1002/cplu.202200036
Abstrakt: 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 Fe 2 O 3 (Ni-Fe 2 O 3 ) 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-Fe 2 O 3 and thus enhances the electrocatalytic performance. Ni-Fe 2 O 3 /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 0.173×10 24  cm -3 . Further, in presence of 1 M CH 3 OH, 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-Fe 2 O 3 /O-CNT could be attributed to the synergistic interaction between Ni-doped Fe 2 O 3 and O-CNT.
(© 2022 The Authors. ChemPlusChem published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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