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Highly active and durable nitrogen doped-reduced graphene oxide/double perovskite bifunctional hybrid catalysts

Abstract

A-site cation doping in perovskite-based materials with a general ABO3 formula has a significant effect on the bifunctional oxygen activity (oxygen evolution and reduction reactions) of the electrocatalysts with chemical stability, enabling the design of highly active, durable, and cost-effective catalysts. In particular, the oxygen activity of double perovskite-structured NdBa0.5Sr0.5Co1.5Fe0.5O5+δ (NBSCF) is 0.973 V, which is much greater than that of previously reported transition metal-based nanostructures. This result is verified by examination of the electronic structure, oxidation state, and electrical properties of perovskite-based materials using density functional theory (DFT) calculations, iodometric titration method, x-ray photon spectroscopy (XPS), and electrochemical impedance spectroscopy (EIS) analysis. Further improvements of NBSCF for bifunctional oxygen activity are made by incorporating these synergistic hybrid structures with nitrogen doped-reduced graphene-based (N-rGO) nanostructures (NBSCF/N-rGO). The NBSCF/N-rGO has an oxygen electrode activity of 0.766 V, which is superior to that of other previously reported transition metal-based nanostructures and compares favorably to precious metal electrocatalysts. Furthermore, strong N-rGO provides considerably greater electrochemical long-term stability and integrity of NBSCF/N-rGO hybrid catalysts under continuous chronopotentiometric and long-term potential sweep testing conditions for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR).

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Publication details

The article was received on 15 Mar 2017, accepted on 17 May 2017 and first published on 17 May 2017


Article type: Paper
DOI: 10.1039/C7TA02283B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Highly active and durable nitrogen doped-reduced graphene oxide/double perovskite bifunctional hybrid catalysts

    N. Kim, R. A. Afzal, S. R. Choi, S. W. Lee, D. Ahn, S. Bhattacharjee, S. Lee, J. H. Kim and J. Park, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02283B

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