Highly active and durable nitrogen doped-reduced graphene oxide/double perovskite bifunctional hybrid catalysts
- Highly active and durable nitrogen doped-reduced graphene oxide/double perovskite bifunctional hybrid catalysts
- 이승철; Nam-In Kim; Rana Arslan Afzal; Sung Ryul Choi; Sung Won Lee; Docheon Ahn; Satadeep Bhattacharjee; Jung Hyun Kim; Jun-Young Park
- perovskite catalyst; N-doped graphene oxide; density functional theory; BSCF; LBSCF; oxygen evolution reaction; oxygen reduction reaction
- Issue Date
- Journal of materials chemistry. A, Materials for energy and sustainability
- VOL 5, NO 25-13031
- A-site cation doping in perovskite-based materials with the general ABO3 formula has a significant effect on the bifunctional oxygen activity (oxygen evolution and reduction reactions) of chemically stable electrocatalysts, 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 the perovskite-based materials using density functional theory (DFT) calculations, the 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 that of precious metal electrocatalysts. Furthermore, strong N-rGO provides considerably greater electrochemical long-term stability and integrity to NBSCF/N-rGO hybrid catalysts under continuous chronopotentiometric and long-term potential sweep testing conditions for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR).
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