TY - JOUR

T1 - Bifunctional Oxygen Reduction/Oxygen Evolution Activity of Mixed Fe/Co Oxide Nanoparticles with Variable Fe/Co Ratios Supported on Multiwalled Carbon Nanotubes

AU - Elumeeva, Karina

AU - Kazakova, Mariya A.

AU - Morales, Dulce Maria

AU - Medina, Danea

AU - Selyutin, Alexander

AU - Golubtsov, Georgiy

AU - Ivanov, Yurii

AU - Kuznetzov, Vladimir

AU - Chuvilin, Andrey

AU - Antoni, Hendrik

AU - Muhler, Martin

AU - Schuhmann, Wolfgang

AU - Masa, Justus

N1 - © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

PY - 2018/4/9

Y1 - 2018/4/9

N2 - A facile strategy is reported for the synthesis of Fe/Co mixed metal oxide nanoparticles supported on, and embedded inside, high purity oxidized multiwalled carbon nanotubes (MWCNTs) of narrow diameter distribution as effective bifunctional catalysts able to reversibly drive the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) in alkaline solutions. Variation of the Fe/Co ratio resulted in a pronounced trend in the bifunctional ORR/OER activity. Controlled synthesis and in-depth characterization enabled the identification of an optimal Fe/Co composition, which afforded a low OER/OER reversible overvoltage of only 0.831V, taking the OER at 10mAcm-2 and the ORR at -1mAcm-2. Importantly, the optimal catalyst with a Fe/Co ratio of 2:3 exhibited very promising long-term stability with no evident change in the potential for both the ORR and the OER after 400 charge/discharge (OER/ORR) cycles at 15mAcm-2 in 6m KOH. Moreover, detailed investigation of the structure, size, and phase composition of the mixed Fe/Co oxide nanoparticles, as well as their localization (inside of or on the surface of the MWCNTs) revealed insight of the possible contribution of the individual catalyst components and their synergistic interaction in the catalysis.

AB - A facile strategy is reported for the synthesis of Fe/Co mixed metal oxide nanoparticles supported on, and embedded inside, high purity oxidized multiwalled carbon nanotubes (MWCNTs) of narrow diameter distribution as effective bifunctional catalysts able to reversibly drive the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) in alkaline solutions. Variation of the Fe/Co ratio resulted in a pronounced trend in the bifunctional ORR/OER activity. Controlled synthesis and in-depth characterization enabled the identification of an optimal Fe/Co composition, which afforded a low OER/OER reversible overvoltage of only 0.831V, taking the OER at 10mAcm-2 and the ORR at -1mAcm-2. Importantly, the optimal catalyst with a Fe/Co ratio of 2:3 exhibited very promising long-term stability with no evident change in the potential for both the ORR and the OER after 400 charge/discharge (OER/ORR) cycles at 15mAcm-2 in 6m KOH. Moreover, detailed investigation of the structure, size, and phase composition of the mixed Fe/Co oxide nanoparticles, as well as their localization (inside of or on the surface of the MWCNTs) revealed insight of the possible contribution of the individual catalyst components and their synergistic interaction in the catalysis.

KW - Bifunctional catalysts

KW - Fe/Co oxide nanoparticles

KW - Multiwalled carbon nanotubes

KW - Oxygen evolution

KW - Oxygen reduction

KW - multiwalled carbon nanotubes

KW - oxygen evolution

KW - bifunctional catalysts

KW - oxygen reduction

KW - WATER OXIDATION

KW - IRON

KW - ELECTROCATALYSTS

KW - CO OXIDE

KW - COBALT OXIDE

KW - METAL

KW - SPINEL OXIDES

KW - CATALYSTS

KW - IN-SITU

KW - FE

UR - http://www.scopus.com/inward/record.url?scp=85043258207&partnerID=8YFLogxK

U2 - 10.1002/cssc.201702381

DO - 10.1002/cssc.201702381

M3 - Article

C2 - 29359864

AN - SCOPUS:85043258207

VL - 11

SP - 1204

EP - 1214

JO - ChemSusChem

JF - ChemSusChem

SN - 1864-5631

IS - 7

ER -