%0 Journal Article
%T Composition, valence and oxygen reduction reaction activity of Mn-based layered double hydroxides
%A Akira Miura
%A Kiyoharu Tadanaga
%A Mikio Higuchi
%A Nataly Carolina Rosero-Navarro
%A Yu Iwai
%J Journal of Asian Ceramic Societies
%D 2019
%R https://doi.org/10.1080/21870764.2019.1581321
%X ABSTRACT The oxygen reduction reaction (ORR) activity and cation valences of Mn-based Ni¨CMn¨CFe and Mg¨CMn 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
%U https://www.tandfonline.com/doi/full/10.1080/21870764.2019.1581321