caa a22 4500 606173803 CHVBK 20210128100735.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s11244-015-0395-8 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0395-8 Nanostructured Nickelate Oxides as Efficient and Stable Cathode Electrocatalysts for Li-O2 Batteries [Elektronische Daten] [Ayad Nacy, Xianfeng Ma, Eranda Nikolla] Li-O2 (Li-air) batteries are among the most promising energy storage technologies due to their high theoretical specific capacity and energy density. Key challenges with this technology include high overpotential losses associated with catalyzing the electrochemical reactions (i.e., oxygen reduction and evolution reactions) at the cathode of the battery. In this contribution, we report through the example of La2NiO4+δ that layered nickelate oxide materials with rod-shaped nanostructure exhibit promising electrochemical performance as cathode electrocatalysts for Li-O2 batteries. We demonstrate the ability to control the nanostructure of La2NiO4+δ electrocatalyst at the nanoscale level using a reverse-microemulsion synthesis approach. We show that Li-O2 batteries with cathodes containing rod-shaped La2NiO4+δ electrocatalyst exhibit lower charging potentials and higher reversible capacities when compared to batteries with carbon-only cathodes. Our studies indicate that the enhancement in the battery performance induced by the rod-shaped La2NiO4+δ electrocatalyst can be attributed to the fact that La2NiO4+δ nanorods (i) facilitate the formation of nanosized Li2O2 particles during discharge, and (ii) promote the electrocatalytic activity toward the oxygen evolution reaction during charging. These findings open up avenues for the utilization of (i) reverse-microemulsion method for controlling the nanostructure of layered oxide materials, and (ii) nanorod-structured nickelate oxides as efficient cathode electrocatalysts for Li-O2 batteries. Springer Science+Business Media New York, 2015 Li-O2 battery nationallicence Nickelate oxides nationallicence Lanthanum nickelate oxide nationallicence Oxygen evolution reaction nationallicence Reverse-microemulsion synthesis nationallicence Nacy Ayad Department of Chemical Engineering and Materials Science, Wayne State University, 48202, Detroit, MI, USA aut Ma Xianfeng Department of Chemical Engineering and Materials Science, Wayne State University, 48202, Detroit, MI, USA aut Nikolla Eranda Department of Chemical Engineering and Materials Science, Wayne State University, 48202, Detroit, MI, USA aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/7-9(2015-05-01), 513-521 1022-5528 58:7-9<513 2015 58 11244 https://doi.org/10.1007/s11244-015-0395-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0395-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nacy Ayad Department of Chemical Engineering and Materials Science, Wayne State University, 48202, Detroit, MI, USA aut NATIONALLICENCE 700 1- Ma Xianfeng Department of Chemical Engineering and Materials Science, Wayne State University, 48202, Detroit, MI, USA aut NATIONALLICENCE 700 1- Nikolla Eranda Department of Chemical Engineering and Materials Science, Wayne State University, 48202, Detroit, MI, USA aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/7-9(2015-05-01), 513-521 1022-5528 58:7-9<513 2015 58 11244