Facile synthesis of CoFe-LDH/MWCNT/rGO nanocomposite as efficient bifunctional electrocatalysts for oxygen evolution and reduction

The hydrothermal synthesis of CoFe layered double hydroxide/multiwalled carbon nanotube/reduced graphene oxide (CoFe-LDH/MWCNT/rGO) nanocomposite, a highly efficient bifunctional electrocatalyst for oxygen evolution reaction (OER) and oxygen reduction reactions (ORR), was reported in this work. The...

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Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2020-01, Vol.856, p.113697, Article 113697
Main Authors: Yang, Yu Jun, Duan, Manhua, Yan, Chunxia, Zhao, Dandan, Jiang, Cao, Duan, Xinyu, Song, Xinyi
Format: Article
Language:English
Subjects:
Carbon nanotubes
Catalytic activity
Charge efficiency
Charge transfer
Charge transport
Electrocatalysts
Graphene
Hydroxides
Layered double hydroxide
Multi wall carbon nanotubes
Nanocomposites
Oxygen evolution reaction
Oxygen evolution reactions
Oxygen reduction reaction
Oxygen reduction reactions
Reduced graphene oxide
Route selection
Selectivity
Structural hierarchy
Synthesis
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Summary:The hydrothermal synthesis of CoFe layered double hydroxide/multiwalled carbon nanotube/reduced graphene oxide (CoFe-LDH/MWCNT/rGO) nanocomposite, a highly efficient bifunctional electrocatalyst for oxygen evolution reaction (OER) and oxygen reduction reactions (ORR), was reported in this work. The hybridization of MWCNT and rGO with CoFe-LDH endows the obtained nanocomposite both hierarchical porous structure and enhanced conductivity, which significantly facilitate the mass transport and charge transfer efficiency for OER and ORR. CoFe-LDH/MWCNT/rGO displayed efficient OER activity in 1.0 M KOH with a low onset overpotential of 330 mV and an overpotential of 430 mV to reach the 10 mA/cm2 current density. The CoFe-LDH/MWCNT/rGO also presents excellent ORR catalytic activity with onset potential of 708 mV vs. RHE in 0.1 M KOH with a 4e-route selectivity. The excellent bifunctional catalytic activity of the CoFe-LDH/MWCNT/rGO for OER and ORR could be attributed to the synergistic effects of MWCNT, rGO and CoFe-LDH. •CoFe-LDH/MWCNT/rGO was synthesized via a hydrothermal method.•OER and ORR activities of CoFe-LDH/MWCNT/rGO in alkaline media were studied.•CoFe-LDH/MWCNT/rGO shows OER activity with an onset overpotential of 330 mV.•CoFe-LDH/MWCNT/rGO presents an ORR onset potential of 708 mV.•CoFe-LDH/MWCNT/rGO-catalyzed ORR follows a predominant 4-electron pathway.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2019.113697