Journal
CATALYSIS TODAY
Volume 357, Issue -, Pages 259-268Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2019.02.047
Keywords
Bifunctional electrocatalyst; Oxygen reduction reaction; Oxygen evolution reaction; Fe-Co-Ni oxide nanoparticles; Oxidized multi-walled carbon nanotubes
Funding
- Russian Foundation for Basic Research [16-32-60046 mol_a_dk]
- Deutscher Akademischer Austauschdienst (DAAD)
- Consejo Nacional de Ciencia y Tecnologia (CONACyT)
- Deutsche Forschungsgemeinschaft (DFG) [CRC/TRR 247]
- Ministry of Science and Higher Education of the Russian Federation [AAAA-A17-117041710085-9]
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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.
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