Theoretical and Experimental Investigation of In Situ Grown MOF‐Derived Oriented Zr‐Mn‐oxide and Solution‐Free CuO as Hybrid Electrode for Supercapacitors

Abstract

Recently metal‐organic framework (MOF) derived electrode materials have grown considerable research interest in the field of supercapacitor (SC) technology. Herein, MOF‐derived Zr‐Mn‐oxide is successively combined with solution‐free CuO nanowires not only to avoid the structural limitations of MOF but also to fabricate a positive‐negative hybrid electrode material. The MOF‐derived mixed metal oxide prepared through in situ fabrication allows the uniform and unidirectional growth of oriented Zr‐Mn‐oxide@CuO@Cu. The hybrid electrode exhibited over 100% stability after 20,000 cycles in a three‐electrode setup with a wide potential window range of 1.2 V (−0.6 to 0.6 V). Further, the obtained Zr‐Mn‐oxide@CuO@Cu hybrid electrode exhibited 14.1‐ and 5.5‐fold higher capacity over its MOF‐derived Zr‐Mn‐oxide counterpart (−0.6 to 0.1 V) and CuO (0.0 to 0.5 V), respectively. Additionally, the hybrid device with hybrid Zr‐Mn‐oxide@CuO@Cu as the positive electrode and reduced graphene oxide as the negative electrode also displayed promising energy and power densities. Furthermore, density functional theory calculations are employed to study the hybrid electrode material's properties. Overall, the unidirectional and vertically aligned MOF‐derived Zr‐Mn‐oxide@CuO@Cu hybrid electrode material with notable electrochemical performance can be useful for the fabrication of next‐generation supercapacitor electrodes.

Road Map for In Situ Grown Binder‐Free MOFs and Their Derivatives as Freestanding Electrodes for Supercapacitors

“…The bimetallic phosphide structure of the electrode (ZnNiP/NF) besides delivering appreciable energy storage behavior, provided stability to the electrode with phosphide nanoparticles alleviating the collapse of the electrode during cycling. Other reports on in situ grown bimetallic MOFs and derivatives include combining gallium (Ga) with Ni (NiGa‐LDH/CNT/CC) to obtain MOF and combine them with CNT, [ 148 ] and the works of Zhang and co‐workers to create a heterojunction between CuO nanowire grown on Cu mesh [ 134 ] and bimetallic MOFs (ZnCo‐MOF [ 149 ] and ZrMn‐MOF [ 150 ] ). The outstanding energy storage of the electrodes (ZnCo‐MOF/CuO/Cu mesh and ZrMn‐MOF/CuO/Cu mesh) together with high structural merits to withstand up to 20 000 GCD cycles with theoretical calculations inform more in designing electrode materials for energy storage applications.…”

Vacancy designed 2D materials for electrodes in energy storage devices

“…have been widely investigated in the recent decades. [7][8][9][10][11][12][13][14] In order to enhance the performance of these energy-related devices, the optimization of all of their components (electrodes, electrolyte and current collector) is essential. It is important to notice that although both SCs and batteries store charge through electrochemical processes, there is a distinct difference between the charge storage mechanisms in these two types of devices.…”

Directionally In Situ Self-Assembled Iridium(III)-Polyimine Complex-Encapsulated Metal–Organic Framework Two-Dimensional Nanosheet Electrode To Boost Electrochemiluminescence Sensing

“…Metal–organic frameworks (MOFs) are one kind of porous nanomaterial with a large surface area and a regulated pore size. , Numerous studies have witnessed that MOFs can load different substrates. , Once being loaded in MOFs, the stability will be improved with enhanced performance because MOFs can maximally encapsulate guest materials in uniform-dispersion state and synergistically interact with each other . Meanwhile, MOFs’ functionality is introduced.…”