Details

Autor(en) / Beteiligte

• Kim, Nam-In
• Sung-Hwa Cho
• Park, Se Hwan
• Young Joo Lee
• Rana Arslan Afzal
• Yoo, Jeseung
• Young-Soo, Seo
• Yun Jung Lee
• Jun-Young, Park

Titel

B-site doping effects of NdBa0.75Ca0.25Co2O5+δ double perovskite catalysts for oxygen evolution and reduction reactions

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2018, Vol.6 (36), p.17807-17818

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• As bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), we introduce an economical, particularly active, stable, and completely noble-metal-free catalyst based on CaO-doped NdBaCo2O5+δ with the aim of exploiting its high catalytic activity for the oxygen electrode. Further, the electrochemical performances of the NdBa0.75Ca0.25Co2O5+δ catalyst are improved by doping transition-metal oxides (Fe2+, Ni2+, Cu2+, and Mn2+) into the B-sites of double perovskite oxides, facilitating the movement of electrons and oxygen-ions through oxygen vacancies. Among these, NdBa0.75Ca0.25Co1.5Fe0.5O5+δ (NBCCFe) shows the highest electrocatalytic oxygen electrode activity for the OER and ORR, and NBCCFe thus is hybridized with nitrogen-reduced graphene oxide (N-rGO) to further improve its catalytic activity with excellent durability. Hybridization of NBCCFe with N-rGO further boosts bifunctional oxygen electrode activity (0.761 V) with better durability, which surpasses those of Pt/C (0.815 V) and Ir/C (0.768 V) catalysts. A rechargeable lithium–air battery assembled with the NBCCFe/N-rGO catalyst exhibits remarkably improved discharge capacity, reduced charge overpotential and an extended cycle life, corroborating the excellent bifunctional catalytic activity of NBCCFe/N-rGO. The NBCCFe/N-rGO catalyst also displays the most improved polarization during both discharge and charge, further confirming the highest bifunctional catalytic activity of NBCCFe/N-rGO.