Metal‐Organic‐Framework‐Derived MCo₂O₄ (M=Mn and Zn) Nanosheet Arrays on Carbon Cloth as Integrated Anodes for Energy Storage Applications

Abstract

Electrode materials with special microstructures derived from metal‐organic frameworks (MOFs) exhibited high performance in electrochemical energy storage devices. In this manuscript, using freshly prepared Co−MOF nanosheet arrays as the self‐sacrificed template, MCo2O4 (M=Mn and Zn) nanosheet arrays were successfully grown on carbon cloth (CC) by using a facile solution method. As‐prepared MnCo2O4@CC and ZnCo2O4@CC were used as the integrated electrodes for supercapacitors and Li‐ion batteries. Studies found that both integrated electrodes delivered high capacity and a long cycling life of 20 000 cycles with the capacity retention of 95.5 % for MnCo2O4@CC and 94.7 % for ZnCo2O4@CC at the current density of 50 mA cm−2, respectively. Assembled into asymmetric supercapacitors with carbon nanosheet arrays@CC (CNS@CC), the obtained maximum energy densities were measured to be 25.6 Wh kg−1 at the power density of 3.4 kW kg−1 for MnCo2O4@CC//CNS@CC based device and 22.7 Wh kg−1 at the power density of 4.1 kW kg−1 for ZnCo2O4@CC//CNS@CC based device, respectively. In addition, both integrated electrodes also showed good lithium storage performance, delivering high capacities of 1289 mA h/g (MnCo2O4@CC) and 1376 mA h/g (ZnCo2O4@CC) even after 200 cycles at the current density of 1 A g−1, respectively. The outstanding performances suggest the potential of both nanosheet arrays integrated electrodes for extensive applications in energy storage devices.

High-Hole-Mobility Metal–Organic Framework as Dopant-Free Hole Transport Layer for Perovskite Solar Cells

“…Metal–organic frameworks (MOFs) possess properties of high degree flexibility, including adjustable electrical [ 35 ], optical [ 35 ], and mechanical properties [ 36 , 37 ]. It has attracted much attention in the fields of electronic devices [ 38 , 39 ], such as memristors, field-effect transistors, supercapacitors [ 40 ], and various sensor architectures [ 41 – 43 ]. In recent years, MOFs have been applied in PSCs due to the properties of regular micro-pore structures and low-temperature process [ 44 – 48 ].…”

Superstructure MOF as a framework to composite MoS2 with rGO for Li/Na-ion battery storage with high-performance and stability

“…In addition, modifi-cation of a MOF electrode is one of the leading development directions of MOF electrodes. 21 Bimetallic ion batteries have preferential performance 22 and bimetallic MOF materials have chemically introduced other metals with different strengths into the existing MOF, [23][24][25][26] thus significantly improving the performance of materials. The electrode made of bimetallic sulfide has good storage capacity 18,27,28 mainly because of the abundance of active storage sites, and the synergistic effect of the interface makes abundant structural defects between different metal sulfide and further activates the inert electrode location, which altogether largely improves the electrochemical performance.…”

Porous NiCo2O4–FeCo2O4 Nanowire Arrays as Advanced Electrodes for High-Performance Flexible Asymmetric Supercapacitors

“…To solve the problem, many attempts have been made for developing bimetallic oxides (AB 2 O 4 ), ,, which possess much higher redox centers than the corresponding single-component oxides. Especially, the bimetallic oxide MCo 2 O 4 (M = Ni, Fe, Mn, and so on) with a spinel-like structure − has become a promising material with reversible capacity, excellent structural stability, and high electrical conductivity. ,− For instance, a ternary metallic oxide, spinel nickel cobaltite (NiCo 2 O 4 ), possesses a high conductivity and higher electrochemical activity than monometallic materials. However, NiCo 2 O 4 has low capacitance during fast charging/discharging at high current densities, and the voltage window of the NiCo 2 O 4 electrode is only about 0.4–0.6 V. Up to now, there is little work focusing on the combination of different AB 2 O 4 for electrochemical energy storage …”