2D Metal‐Organic Framework Derived Co3O4 for the Oxygen Evolution Reaction and High‐Performance Lithium‐Ion Batteries

Abstract Recently, MOF‐derived (metal‐organic framework) 2D materials, due to the special structure of the MOF inherited, have become a potential candidate for application in energy storage and conversion. In this work, a new 2D layered Co−MOF was synthesized as the precursor for fabricating Napoleon‐like Co 3 O 4 (NL−Co 3 O 4 ). The monolayer thickness of NL−Co 3 O 4 is approximately 70 nm. The unique structure of layered porous of NL−Co 3 O 4 derived from Co−MOF plays an important role in improving electrochemical and electro‐catalysis properties. As lithium ion battery anode material, NL−Co 3 O 4 shows out‐bound cycling performance and rate capacity, which has an unprecedented high reversible capacity of 1120.5 mA h g −1 at 200 mA g −1 after 300 cycles and high rate capacities of 579.4 mA h g −1 under the current density of 6.4 A g −1 . NL−Co 3 O 4 still exhibits capacity of 679 and 576 mA h g −1 after 200 cycles at high current densities of 1 and 4 A g −1 , respectively. Moreover, NL−Co 3 O 4 has efficient oxygen evolution reduction (OER) catalytic performance (overpotential, ca. 420 mV), comparable with commercial RuO 2 . During the process of continuous catalysis of OER, NL−Co 3 O 4 shows good durability for about 15 h.