Composition, valence and oxygen reduction reaction activity of Mn-based layered double hydroxides. Issue 2 (3rd April 2019)

• Record Type: Journal Article
• Authors: Iwai, Yu; Miura, Akira; Rosero-Navarro, Nataly Carolina; Higuchi, Mikio; Tadanaga, Kiyoharu
• Is Part Of: Journal of Asian ceramic societies. Volume 7:Issue 2(2019)
• Page Start: 147
• Page End: 153
• Publication Date: 2019-04-03
• Subjects: Layered double hydroxides -- XAFS (EXAFS and XANES) -- oxygen reduction reaction -- catalytic properties; Ceramics -- East Asia -- Periodicals; Materials science -- Periodicals; 620.1405
• DOI: 10.1080/21870764.2019.1581321
• Languages: English
• ISSNs: 2187-0764

Abstract

ABSTRACT: The oxygen reduction reaction (ORR) activity and cation valences of Mn-based Ni–Mn–Fe and Mg–Mn layered double hydroxides (LDHs) with various compositions were studied. The valences of the 3D transition metals (Mn, Fe, and Ni) were examined by X-ray absorption. The average valence of Ni was approximately 2, and that of Mn was approximately 3 in the LDHs investigated in this study. The valence of Fe decreased with increases in the Mn/Fe ratio. Increasing the amount of Mn enhanced the ORR activity, while the valences and surface areas of the LDHs had no significant effect on the activity.