Research output: Contribution to journal › Article › peer-review
Fe/Co/Ni mixed oxide nanoparticles supported on oxidized multi-walled carbon nanotubes as electrocatalysts for the oxygen reduction and the oxygen evolution reactions in alkaline media. / Kazakova, Mariya A.; Morales, Dulce M.; Andronescu, Corina et al.
In: Catalysis Today, Vol. 357, 01.11.2020, p. 259-268.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Fe/Co/Ni mixed oxide nanoparticles supported on oxidized multi-walled carbon nanotubes as electrocatalysts for the oxygen reduction and the oxygen evolution reactions in alkaline media
AU - Kazakova, Mariya A.
AU - Morales, Dulce M.
AU - Andronescu, Corina
AU - Elumeeva, Karina
AU - Selyutin, Alexander G.
AU - Ishchenko, Arcady V.
AU - Golubtsov, Georgiy V.
AU - Dieckhöfer, Stefan
AU - Schuhmann, Wolfgang
AU - Masa, Justus
N1 - Publisher Copyright: © 2019 Elsevier B.V. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/11/1
Y1 - 2020/11/1
N2 - Fabrication of efficient and cost-effective bifunctional oxygen electrocatalysts for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) remains a challenge for the development of rechargeable metal-air batteries and unitized regenerative fuel cells technologies. Herein, we report high-performance bifunctional ORR/OER electrocatalysts consisting of mixed transition metal (Fe, Co, Ni) oxide nanoparticles supported on oxidized multi-walled carbon nanotubes (MWCNT). Investigation of the ORR and OER activity of samples with different metal compositions showed that trimetallic/MWCNT composites having Fe:Ni:Co = x:x:(1-2x) ratios, with 0.25 ≤ x ≤ 0.4, exhibit highest bifunctional activity in terms of the reversible ORR/OER overvoltage at a given current density. Moreover, the trimetallic catalysts exhibited improved selectivity with respect to the reduction of O 2 to OH − compared to the bimetallic Fe-Ni, Fe-Co and Co-Ni catalysts, thus revealing synergistic interactions among the metal oxide components. Correlation of the electrocatalytic activity with the structure of the composites is discussed for the most representative cases.
AB - Fabrication of efficient and cost-effective bifunctional oxygen electrocatalysts for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) remains a challenge for the development of rechargeable metal-air batteries and unitized regenerative fuel cells technologies. Herein, we report high-performance bifunctional ORR/OER electrocatalysts consisting of mixed transition metal (Fe, Co, Ni) oxide nanoparticles supported on oxidized multi-walled carbon nanotubes (MWCNT). Investigation of the ORR and OER activity of samples with different metal compositions showed that trimetallic/MWCNT composites having Fe:Ni:Co = x:x:(1-2x) ratios, with 0.25 ≤ x ≤ 0.4, exhibit highest bifunctional activity in terms of the reversible ORR/OER overvoltage at a given current density. Moreover, the trimetallic catalysts exhibited improved selectivity with respect to the reduction of O 2 to OH − compared to the bimetallic Fe-Ni, Fe-Co and Co-Ni catalysts, thus revealing synergistic interactions among the metal oxide components. Correlation of the electrocatalytic activity with the structure of the composites is discussed for the most representative cases.
KW - Bifunctional electrocatalyst
KW - Fe-Co-Ni oxide nanoparticles
KW - Oxidized multi-walled carbon nanotubes
KW - Oxygen evolution reaction
KW - Oxygen reduction reaction
KW - PERFORMANCE
KW - BIFUNCTIONAL ELECTROCATALYST
KW - CO
KW - PHOSPHIDE
KW - XPS
KW - SPECTRA
KW - CATALYSTS
KW - FE
UR - http://www.scopus.com/inward/record.url?scp=85061814342&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2019.02.047
DO - 10.1016/j.cattod.2019.02.047
M3 - Article
AN - SCOPUS:85061814342
VL - 357
SP - 259
EP - 268
JO - Catalysis Today
JF - Catalysis Today
SN - 0920-5861
ER -
ID: 18908493