open access

https://hdl.handle.net/2115/65491

Nitrogen-Rich Manganese Oxynitrides with Enhanced Catalytic Activity in the Oxygen Reduction Reaction

英語

2016-05-19

Wiley-Blackwell

Angewandte Chemie International Edition

55(28)

7963-7967

The catalytic activity of manganese oxynitrides in the oxygen reduction reaction (ORR) was investigated in alkaline solutions to clarify the effect of nitrogen on ORR activity. These oxynitrides, having rocksalt-based structures with different nitrogen content, were synthesized by reactions of MnO, Mn2O3, and MnO2 with molten NaNH2 at 240-280 ℃. Anion contents and Mn valence states were determined by combustion analysis, powder X-ray diffraction, and X-ray absorption near edge structure analysis. An increase in nitrogen content in rocksalt- based manganese oxynitrides enhanced the valence of manganese and reinforced the catalytic activity for the ORR in 1 M KOH solution. Nearly single-electron occupancy in antibonding eg states and high covalency in Mn–N bonding would enhance the ORR activity of nitrogen-rich manganese oxynitrides.

学術雑誌論文

Accepted Manuscript

This is the peer reviewed version of the following article: Nitrogen-Rich Manganese Oxynitrides with Enhanced Catalytic Activity in the Oxygen Reduction Reaction, which has been published in final form at http://dx.doi.org/10.1002/anie.201601568. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

1433-7851