Formation of N‐Doped Carbon‐Coated ZnO/ZnCo₂O₄/CuCo₂O₄ Derived from a Polymetallic Metal–Organic Framework: Toward High‐Rate and Long‐Cycle‐Life Lithium Storage

Abstract

Metal-organic frameworks (MOFs) are very promising self-sacrificing templates for the large-scale fabrication of new functional materials owing to their versatile functionalities and tunable porosities. Most conventional metal oxide electrodes derived from MOFs are limited by the low abundance of incorporated metal elements. This study reports a new strategy for the synthesis of multicomponent active metal oxides by the pyrolysis of polymetallic MOF precursors. A hollow N-doped carbon-coated ZnO/ZnCo O /CuCo O nanohybrid is prepared by the thermal annealing of a polymetallic MOF with ammonium bicarbonate as a pore-forming agent. This is the first report on the rational design and preparation of a hybrid composed of three active metal oxide components originating from MOF precursors. Interestingly, as a lithium-ion battery anode, the developed electrode delivers a reversible capacity of 1742 mAh g after 500 cycles at a current density of 0.3 mA g . Furthermore, the material shows large storage capacities (1009 and 667 mAh g ), even at high current flow (3 and 10 A g ). The remarkable high-rate capability and outstanding long-life cycling stability of the multidoped metal oxide benefits from the carbon-coated integrated nanostructure with a hollow interior and the three active metal oxide components.

Construction of Highly Active and Selective Polydopamine Modified Hollow ZnO/Co3O4 p-n Heterojunction Catalyst for Photocatalytic CO2 Reduction

“…27,28 Recently, metal−organic frameworks (MOFs), a novel class of porous materials with unique porous structure and high specific surface area, have become attractive precursors to synthesize novel heterojunction photocatalysts. 29,30 The intimate p-n heterojunction interfaces could form from pyrolyzing bimetallic zeolitic imidazolate frameworks (ZIFs). Since the two metal ions are linked by coordinating ligands into periodic arrays in ZIFs, the two metal oxides from pyrolysis of ZIFs are expected to remain in good contact through abundant interfaces.…”

Metal/covalent‐organic frameworks for electrochemical energy storage applications

“…Multi-metal oxides can be prepared by subsequent pyrolysis. Cai et al 102 produced Zn-Cu-Co ternary metal ion contained MOF by repeating posts-synthetic ionic exchange process. In addition, a carbon coated ternary metal oxide with hollow hierarchical structure was obtained via high-temperature processing (Figure 4H-J).…”

MoO3 structures transition from nanoflowers to nanorods and their sensing performances

“…Consequently, metal oxide semiconductors have attracted signi cant attention in recent years for their applications to the secondary cells, sensors, memories, photodetectors, eld-effect transistors, and heavy metal etc. [6][7][8][9][10][11][12].…”