Promotion of oxygen reduction by a bio-inspired tethered iron phthalocyanine carbon nanotube-based catalyst

Ruiguo Cao, Ranjit Thapa, Hyejung Kim, Xiaodong Xu, Min Gyu Kim, Qing Li, Noejung Park, Meilin Liu and Jaephil Cho ()
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Ruiguo Cao: Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST)
Ranjit Thapa: Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST)
Hyejung Kim: Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST)
Xiaodong Xu: Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST)
Min Gyu Kim: Pohang Accelerator Laboratory (PAL)
Qing Li: Los Alamos National Laboratory
Noejung Park: Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST)
Meilin Liu: School of Materials Science and Engineering, Center for Innovative Fuel Cell and Battery Technologies, Georgia Institute of Technology
Jaephil Cho: Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Electrocatalysts for oxygen reduction are a critical component that may dramatically enhance the performance of fuel cells and metal-air batteries, which may provide the power for future electric vehicles. Here we report a novel bio-inspired composite electrocatalyst, iron phthalocyanine with an axial ligand anchored on single-walled carbon nanotubes, demonstrating higher electrocatalytic activity for oxygen reduction than the state-of-the-art Pt/C catalyst as well as exceptional durability during cycling in alkaline media. Theoretical calculations suggest that the rehybridization of Fe 3d orbitals with the ligand orbitals coordinated from the axial direction results in a significant change in electronic and geometric structure, which greatly increases the rate of oxygen reduction reaction. Our results demonstrate a new strategy to rationally design inexpensive and durable electrochemical oxygen reduction catalysts for metal-air batteries and fuel cells.

Date: 2013
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DOI: 10.1038/ncomms3076

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