Nitrogen-Doped Perovskite as a Bifunctional Cathode Catalyst for Rechargeable Lithium–Oxygen Batteries

Abstract

In this work, nitrogen-doped LaNiO perovskite was prepared and studied, for the first time, as a bifunctional electrocatalyst for oxygen cathode in a rechargeable lithium-oxygen battery. N doping was found to significantly increase the Ni contents and oxygen vacancies on the bulk surface of the perovskite, which helped to promote the oxygen reduction reaction and oxygen evolution reaction of the cathode and, therefore, enabled reversible LiO formation and decomposition on the cathode surface. As a result, the oxygen cathodes loaded with N-doped LaNiO catalyst showed an improved electrochemical performance in terms of discharge capacity and cycling stability to promise practical Li-O batteries.

Assemblage of Perovskite LaNiO3 Connected With In Situ Grown Nitrogen‐Doped Carbon Nanotubes as High‐Performance Electrocatalyst for Oxygen Evolution Reaction

“…The peak at 532.9 belongs to adsorbed water, including chemically adsorbed water and physically adsorbed water . Ni 2p 3/2 XPS spectra of LaNiO 3 and LaNiO 3 ‐NCNTs are shown in Figure c and d, and the peaks located at 854 and 856 eV are relate to Ni 2+ and Ni 3+ , respectively . The calculated Ni 3+ /Ni 2+ ratio of LaNiO 3 is lower than LaNiO 3 ‐NCNTs.…”

“…These results are consistent with the above calculations using electrochemical double‐layer capacitance. Obviously, the proposed synthesis method has the advantage of obtaining higher specific surface area of perovskite‐type metal oxides in comparison with other conventional methods (see Table S1, Supporting Information) . Herein, higher surface area might provide more chance of interfacial contact between the electrolyte and the catalyst.…”

“…Oxygen evolution reaction (OER) plays a key role in both metal‐air battery for production of electricity and electrolyzer for hydrogen production through water‐splitting . However, a high overpotential is often required due to the kinetically sluggish reaction involving OH bond breaking and OO bond formation.…”

Improved Electrochemical Performance of FeF3 by Inlaying in a Nitrogen‐Doped Carbon Matrix

“…The skeleton can not only enhance the electron conductivity of FeF 3 , but also provide conductive paths and reduced the resistance between particles. [93][94][95] This not only contributed to further reduce the charge transfer resistance, but also facilitated rapid electrochemical reaction of Li + with the adjacent FeF 3 . [70] Furthermore, carbon structure provided buffer space for the volume changes caused by insertion and extraction of Li + .…”

Selective Partial Substitution of B‐Site with Phosphorus in Perovskite Electrocatalysts for Highly Efficient Oxygen Evolution Reaction

“…Perovskite oxides with the employment of non‐metal elements such as phosphorus (P),, sulfur (S),, nitrogen (N), and fluorine (F) have been developed for improving the electrochemical/photocatalytic activity. Zhu et al.…”