01623nas a2200181   4500008004100000022001400041245011200055210006900167260000900236300001600245490000600261520097600267100001801243700001801261700001501279700001801294856012901312       2018                        eng d  a2470-134300aCobalt-doped Ba2In2O5 brownmillerites: an efficient electrocatalyst for oxygen reduction in alkaline medium0 aCobaltdoped Ba2In2O5 brownmillerites an efficient electrocatalys  cFEB   a1710–17170 v33 aA series of compounds with cobalt doping in the indium site of Ba2In2O5 brownmillerites exhibited excellent oxygen reduction activity under alkaline conditions. Doping (25%) retains the brownmillerite structure with disorder in the O3 site in the two-dimensional alternate layer along the ab plane. Further substitution of cobalt in the indium site leads to the loss of a brownmillerite structure, and the compound attains a perovskite structure. Cobalt-doped samples exhibited far better oxygen reduction reaction (ORR) activity when compared to the parent Ba2In2O5 brownmillerite. Among the series of compounds, BaIn0.25Co0.75O3−δ with the highest Co doping and oxygen vacancies randomly distributed in the lattice exhibited the best ORR activity. BaIn0.25Co0.75O3−δ showed a 40 mV positive shift in the onset potential with better limiting current density and a nearly four-electron-transfer reduction pathway when compared to the parent Ba2In2O5 brownmillerite.1 aJijil, C., P.1 aPatil, I., M.1 aKakade, B.1 aDevi, Nandini  uhttps://library.ncl.res.in/content/cobalt-doped-ba2in2o5-brownmillerites-efficient-electrocatalyst-oxygen-reduction-alkaline