Journal article
Cobalt Nanoparticle‐Embedded Porous Carbon Nanofibers with Inherent N‐ and F‐Doping as Binder‐Free Bifunctional Catalysts for Oxygen Reduction and Evolution Reactions
Chemphyschem, v 18(2)
18 Jan 2017
PMID: 27813238
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Efficient, low‐cost, non‐precious metal‐based, and stable bifunctional electrocatalysts are key to various energy storage and conversion devices such as regenerative fuel cells and metal‐air batteries. In this work, we report cobalt nanoparticle‐embedded porous carbon nanofibers with inherent N‐ and F‐doping as binder‐free bifunctional electrocatalysts with excellent activity for both the oxygen reduction and oxygen evolution reaction (ORR/OER) in an alkaline medium. Single‐step electrospinning of a solution of the polymer mixture (carbon precursor) and the cobalt precursor followed by controlled pyrolysis with an intermediate reduction step in H2 (to reduce cobalt oxides to cobalt) was utilized to synthesize an integrated freestanding catalyst. The fabricated catalyst with effective structural and electronic interaction between the cobalt metal nanoparticles and the N‐ and F‐doped carbon defect sites showed enhanced catalytic properties compared to the benchmark catalysts for ORR and OER (Pt, Ir, and Ru). The ORR potential at the current density of −3 mA cm−2 was 0.81 VRHE and the OER potential at a current density of 10 mA cm−2 was 1.595 VRHE, resulting in a ΔE of only 0.785 V.
Desirable defects: A bifunctional oxygen reduction reaction and oxygen evolution reaction (ORR/OER) electrocatalyst utilizing the synergy between cobalt nanoparticles and N‐and F‐doped carbon defect sites is reported. The catalyst was prepared by single‐step electrospinning of a solution of the polymer mixture and subsequent controlled pyrolysis including an intermediate reduction step.
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Details
- Title
- Cobalt Nanoparticle‐Embedded Porous Carbon Nanofibers with Inherent N‐ and F‐Doping as Binder‐Free Bifunctional Catalysts for Oxygen Reduction and Evolution Reactions
- Creators
- Richa Singhal - Drexel UniversityVibha Kalra - Drexel University
- Publication Details
- Chemphyschem, v 18(2)
- Publisher
- Wiley
- Number of pages
- 7
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000393186100007
- Scopus ID
- 2-s2.0-85007193606
- Other Identifier
- 991014877960704721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Physics, Atomic, Molecular & Chemical