Research output: Contribution to journal › Article › peer-review
Trimetallic Mn-Fe-Ni Oxide Nanoparticles Supported on Multi-Walled Carbon Nanotubes as High-Performance Bifunctional ORR/OER Electrocatalyst in Alkaline Media. / Morales, Dulce M.; Kazakova, Mariya A.; Dieckhöfer, Stefan et al.
In: Advanced Functional Materials, Vol. 30, No. 6, 1905992, 01.02.2020.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Trimetallic Mn-Fe-Ni Oxide Nanoparticles Supported on Multi-Walled Carbon Nanotubes as High-Performance Bifunctional ORR/OER Electrocatalyst in Alkaline Media
AU - Morales, Dulce M.
AU - Kazakova, Mariya A.
AU - Dieckhöfer, Stefan
AU - Selyutin, Alexander G.
AU - Golubtsov, Georgiy V.
AU - Schuhmann, Wolfgang
AU - Masa, Justus
N1 - Publisher Copyright: © 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/2/1
Y1 - 2020/2/1
N2 - Discovering precious metal-free electrocatalysts exhibiting high activity and stability toward both the oxygen reduction (ORR) and the oxygen evolution (OER) reactions remains one of the main challenges for the development of reversible oxygen electrodes in rechargeable metal–air batteries and reversible electrolyzer/fuel cell systems. Herein, a highly active OER catalyst, Fe0.3Ni0.7OX supported on oxygen-functionalized multi-walled carbon nanotubes, is substantially activated into a bifunctional ORR/OER catalyst by means of additional incorporation of MnOX. The carbon nanotube-supported trimetallic (Mn-Ni-Fe) oxide catalyst achieves remarkably low ORR and OER overpotentials with a low reversible ORR/OER overvoltage of only 0.73 V, as well as selective reduction of O2 predominantly to OH−. It is shown by means of rotating disk electrode and rotating ring disk electrode voltammetry that the combination of earth-abundant transition metal oxides leads to strong synergistic interactions modulating catalytic activity. The applicability of the prepared catalyst for reversible ORR/OER electrocatalysis is evaluated by means of a four-electrode configuration cell assembly comprising an integrated two-layer bifunctional ORR/OER electrode system with the individual layers dedicated for the ORR and the OER to prevent deactivation of the ORR activity as commonly observed in single-layer bifunctional ORR/OER electrodes after OER polarization.
AB - Discovering precious metal-free electrocatalysts exhibiting high activity and stability toward both the oxygen reduction (ORR) and the oxygen evolution (OER) reactions remains one of the main challenges for the development of reversible oxygen electrodes in rechargeable metal–air batteries and reversible electrolyzer/fuel cell systems. Herein, a highly active OER catalyst, Fe0.3Ni0.7OX supported on oxygen-functionalized multi-walled carbon nanotubes, is substantially activated into a bifunctional ORR/OER catalyst by means of additional incorporation of MnOX. The carbon nanotube-supported trimetallic (Mn-Ni-Fe) oxide catalyst achieves remarkably low ORR and OER overpotentials with a low reversible ORR/OER overvoltage of only 0.73 V, as well as selective reduction of O2 predominantly to OH−. It is shown by means of rotating disk electrode and rotating ring disk electrode voltammetry that the combination of earth-abundant transition metal oxides leads to strong synergistic interactions modulating catalytic activity. The applicability of the prepared catalyst for reversible ORR/OER electrocatalysis is evaluated by means of a four-electrode configuration cell assembly comprising an integrated two-layer bifunctional ORR/OER electrode system with the individual layers dedicated for the ORR and the OER to prevent deactivation of the ORR activity as commonly observed in single-layer bifunctional ORR/OER electrodes after OER polarization.
KW - bifunctional electrocatalysts
KW - oxidized multi-walled carbon nanotubes
KW - oxygen evolution reaction
KW - oxygen reduction reaction
KW - synergistic effects
KW - ACTIVATION
KW - GRAPHENE
KW - WATER OXIDATION
KW - CO
KW - OXYGEN EVOLUTION REACTION
KW - ENERGY-CONVERSION
KW - REDUCTION
KW - XPS SPECTRA
KW - METAL
KW - CATALYSTS
UR - http://www.scopus.com/inward/record.url?scp=85075214691&partnerID=8YFLogxK
U2 - 10.1002/adfm.201905992
DO - 10.1002/adfm.201905992
M3 - Article
AN - SCOPUS:85075214691
VL - 30
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
IS - 6
M1 - 1905992
ER -
ID: 22429513