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

Abstract

Among several electrocatalysts for energy storage purposes including supercapacitors, metal–organic frameworks (MOFs), and their derivatives have spurred wide spread interest owing to their structural merits, multifariousness with tailor‐made functionalities and tunable pore sizes. The electrochemical performance of supercapacitors can be further enhanced using in situ grown MOFs and their derivatives, eliminating the role of insulating binders whose “dead mass” contribution hampers the device capability otherwise. The expulsion of binders not only ensures better adhesion of catalyst material with the current collector but also facilitates the transport of electron and electrolyte ions and remedy cycle performance deterioration with better chemical stability. This review systematically summarizes different kinds of metal–ligand combinations for in situ grown MOFs and derivatives, preparation techniques, modification strategies, properties, and charge transport mechanisms as freestanding electrode materials in determining the performance of supercapacitors. In the end, the review also highlights potential promises, challenges, and state‐of‐the‐art advancement in the rational design of electrodes to overcome the bottlenecks and to improve the capability of MOFs in energy storage applications.

Metal-Node-Engineered MOF-Derived Cobalt Manganese Selenide with Synergetic Surface Tailoring for Energy Storage Applications

“…With the replacement of Co with the second metal node (Mn), CoMn-MOF@NF acquires a dendrite-like morphology. The topology of the MOF-derived CoMnSe@NF-2h is dictated by the metal ions (Co and Mn) and the organic linker (2-MeIM) that act as “nodes” and “struts”, respectively, causing increased surface area with microstructures . The influence of bimetal nodes over that of monometal can be witnessed in the distinct morphologies of CoSe@NF and CoMnSe@NF-2h under ideal selenization conditions.…”

Review and Perspectives of Monolithic Metal–Organic Frameworks: Toward Industrial Applications

“…Binders are used to specifically shape MOFs and obtain their mechanical strength without losing their porosity and crystallinity. The relationship between the physical and chemical binder (e.g., compatibility, porosity, thermal stability, chemical stability, mechanical properties, cost, and availability) and MOF properties should be considered to select a suitable binder; therefore, we need to well understand the properties of MOFs when formed into monoliths to select a suitable binder. A systematic approach involving experimental testing and evaluation is employed.…”

Unveiling Superior Capacitive Behaviors of One‐Pot Molten Salt‐Engineered B, N Co‐Doped Porous Carbon Sheets

“…As an importantly commercialized energy storage device, supercapacitors (SCs) constructed by activated carbons have high DOI: 10.1002/smll.202204119 power density, superior cycle life, and robust charge-discharge capacity. [1][2][3] Limited by the electrostatic adsorption mechanism, the carbon-based SCs always face low energy density. [4,5] Improving the ionaccessible sites through pore engineering is an effective method to improve the capacity and energy density of electric doublelayer capacitors (EDLCs).…”