Supercapacitors Comprising Phosphonate and Arsonate Metal Organic Frameworks (mofs) as Active Electrode Materials

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This invention discloses a new type of electrode for use in electrochemical double layer capacitors (EDLCs) and supercapacitors. The key development is the use of metal-organic frameworks (MOFs) based on phosphonate and arsonate functional groups, coordinated with metal atoms from groups 1 to 12 (preferably Zn, Cu, Co, Ni, etc.) as the active electrode material. These MOFs exhibit high electrical conductivity as well as exceptional chemical and thermal stability, overcoming the main limitations of current carbon- or carboxylate-based electrode materials. The invention covers both the electrode material itself and the supercapacitors/devices incorporating them.

Use CasesContent extracted from patent full text and abstract with AI.

• High-performance supercapacitors for energy storage in electric vehicles, buses, trains, and industrial equipment (e.g., cranes, elevators).
• Energy storage and fast charging systems in electronics and memory backup (such as SRAM backups).
• Grid energy storage systems where rapid charge/discharge cycling and long lifetime are required.
• Wearable, portable, or miniaturized energy storage devices requiring high cycling stability and durability.
• Specialized capacitors in harsh environments, such as high temperature, corrosive, or humid conditions, where conventional electrodes degrade.

BenefitsContent extracted from patent full text and abstract with AI.

• Substantially improved electrical conductivity compared to common carboxylate-MOF and activated carbon electrodes, enabling faster charging/discharging and higher power density.
• Exceptional thermal and chemical stability—MOFs based on phosphonate and arsonate are stable even at very high temperatures and in corrosive or humid environments, extending the device lifetime.
• Tunability: The properties (surface area, conductivity, stability) can be tailored by varying the choice of metal and organic linker, allowing custom optimization for specific applications.
• High surface area: Porous MOFs can offer much larger effective surface area, resulting in higher capacitance and energy storage per unit mass or volume.
• Broader voltage windows and improved durability, leading to more robust and long-lasting energy storage devices.
• Potential for lower production costs and environmental benefits due to higher stability and less frequent material replacement.

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Patent Abstract

The invention relates to an electrode suitable for constructing an electrochemical double layer capacitor and/or supercapacitor and comprising as an electrode material a metal organic framework (MOF), wherein the MOF comprises an inorganic building unit comprising metal atoms selected from group 1 to group 12 elements, and functional groups of organic linkers comprising oxygen (O) and one or more atoms selected from the group comprising phosphorus (P), arsenic (As), antimony (Sb), silicon (Si), selenium (Se) and bismuth (Bi). In embodiments of the invention, the functional groups of the organic linkers are selected from the group comprising phosphonate, arsonate, phosphonic acid, phosphinic acid, arsonic acids and/or arsinic acids, monoester and/or diester forms thereof. Further, the metal atoms may be selected from the group comprising zinc (Zn), cadmium (Cd), copper (Cu), cobalt (Co), nickel (Ni), gold (Au) and silver (Ag). The invention further relates to an electrochemical double layer capacitor and a supercapacitor comprising an electrode of the invention.