Hierarchical porous FeCo2O4@Ni as a carbon- and binder-free cathode for lithium−oxygen batteries

Advances in Electrochemical and Catalytic Performance of Nanostructured FeCo2O4 and Its Composites

“…As a further advancement, Lithium-air batteries are gaining wide attention due to their ultrahigh theoretical energy density of 3500 W h kg À 1 [86] which is five times greater than the lithiumion batteries. This is attributed to the high energy storage capacity of chemical bonds between Li and oxygen due to its dense nature, which is unlike the intercalation between Li and the metal oxide layers in Li-ion batteries.…”

“…In order to overcome this problem, novel materials with structural and chemical stability along with high Oxygen reduction reaction (ORR)/Oxygen evolution reaction (OER) activity are being developed. [86] In this regard, transition metal oxide of Co i. e., Co 3 O 4 has portrayed great potential. But, in spite of having a very high abundance and bifunctional activity, this is being widely replaced by mixed transition metal oxide due to the toxic nature of Co + 2 ion.…”

“…Also, the rate of reduction of oxygen is faster due to the easy supply of electrons from the oxidation of Fe + 2 to Fe + 3 . Furthermore, Wang et al [86] prepared porous FeCo 2 O 4 nanoflower (grown on Ni foam) via the facile hydro- [87] (c) FE-SEM image of FeCo 2 O 4 @Ni nanoflower with TEM image as inset. [86] (d) FE-SEM image of FeCo 2 O 4 nanosheets with its enlarged portion and TEM image as insets.…”

“…Furthermore, Wang et al [86] prepared porous FeCo 2 O 4 nanoflower (grown on Ni foam) via the facile hydro- [87] (c) FE-SEM image of FeCo 2 O 4 @Ni nanoflower with TEM image as inset. [86] (d) FE-SEM image of FeCo 2 O 4 nanosheets with its enlarged portion and TEM image as insets. (e) Cycle performance of FeCo 2 O 4 nanosheets at 50 mA g À 1 .…”

“…Moreover, Li‐air batteries still face the drawbacks of low energy efficiency and poor capacitance retention due to the passivation of oxygen electrodes. In order to overcome this problem, novel materials with structural and chemical stability along with high Oxygen reduction reaction (ORR)/Oxygen evolution reaction (OER) activity are being developed [86] . In this regard, transition metal oxide of Co i. e., Co 3 O 4 has portrayed great potential.…”