Nitrogen-Coordinated CoS<sub>2</sub>@NC Yolk–Shell Polyhedrons Catalysts Derived from a Metal–Organic Framework for a Highly Reversible Li-O<sub>2</sub> Battery
Zhan Yang, Shun-zhi Yu, Shaohua Luo, Jian Feng, Qing Wang
Abstract
Transition-metal sulfides (TMS) are one of the most promising cathode catalysts for Li–O2 batteries (LOBs) owing to their excellent stabilities and inherent metallicity. In this work, a highly efficient mode has been used to synthesize Co@CNTs [pyrolysis products of metal–organic frameworks (MOFs)]-derived CoS2(CoS)@NC. Benefiting from the special yolk–shell hierarchical porous morphology, the existence of Co–N bonds, and dual-function catalytic activity (ORR/OER) of the open metal sites contributed by MOFs, the CoS2@NC-400/AB electrode illustrated excellent charge–discharge cycling for up to nearly 100 times at a current density of 0.1 mA cm–2 under a limited capacity of 500 mA h g–1 (based on the total weight of CoS2@NC and AB) with a high discharge voltage plateau and a low charge cut-off voltage. Meanwhile, the average transferred electron number (n) is around 3.7 per O2 molecule for CoS2@NC-400, which is the chief approach for a four-electron pathway of the ORR under alkaline media. Therefore, we believe that the novel CoS2@NC-400/AB electrode could serve as an excellent catalyst in the LOBs.