High Energy Capacitors Based on All Metal‐Organic Frameworks Derivatives and Solar‐Charging Station Application

Abstract

High energy and efficient solar charging stations using electrochemical capacitors (ECs) are a promising portable power source for the future. In this work, two kinds of metal‐organic framework (MOF) derivatives, NiO/Co3O4 microcubes and Fe2O3 microleaves, are prepared via thermal treatment and assembled into electrochemical capacitors, which deliver a relatively high specific energy density of 46 Wh kg−1 at 690 W kg−1. In addition, a solar‐charging power system consisting of the electrochemical capacitors and monocrystalline silicon plates is fabricated and a motor fan or 25 LEDs for 5 and 30 min, respectively, is powered. This work not only adds two novel materials to the growing categories of MOF‐derived advanced materials, but also successfully achieves an efficient solar‐ECs system for the first time based on all MOF derivatives, which has a certain reference for developing efficient solar‐charge systems.

Carbon Cloth‐based Hybrid Materials as Flexible Electrochemical Supercapacitors

“…For supercapacitor applications, carbon cloths have been found to act as excellent substrates as they provide high conductivity, surface area and enable ion diffusion, which leads to a decrease in charge transfer resistance and increases in specific capacitance of the resultant electrode. These are highly promising compared to the widely used supercapacitor substrate materials like Ni foam and Fe nanostructures [14,15,[28][29][30][31][32] Chemically treated or activated carbon cloths (ACCs) act as effective adsorbents for inorganic ions and organic molecules. Also, the ACC adsorbents have high reusability as the adsorption sites can be regained by desorption of the adsorbed constituents.…”

“…For supercapacitor applications, carbon cloths have been found to act as excellent substrates as they provide high conductivity, surface area and enable ion diffusion, which leads to a decrease in charge transfer resistance and increases in specific capacitance of the resultant electrode. These are highly promising compared to the widely used supercapacitor substrate materials like Ni foam and Fe nanostructures…”

A Promising Hard Carbon−Soft Carbon Composite Anode with Boosting Sodium Storage Performance

“…Sluggish kinetics and severe structural expansion could easily lead to poor rate capacity and cycle life of the electrode. [8,9] Therefore, exploiting appropriate anode materials for Na + uptake/release is a crucial challenge for SIBs.…”

Rational Construction of V2O5@rGO with Enhanced Pseudocapacitive Storage for High‐Performance Flexible Energy Storage Device

“…[5] The main motivation and reason is the fact that the rapid reaction kinetics occurs on or near the surface of the electrode, and thus facilitates very high power density, and long cycling lifespan. [6] The low specific capacitance and energy density of conventional electrical double-layer capacitors (EDLCs) cannot meet the growing energy demand in a low carbon economy. [7] On the contrary, pseudocapacitors based on the reversible Faraday reaction energy storage mechanism exhibit extraordinary discharge capacitance and expected energy density, which is mainly attributed to the reversible multi-electron redox reactions in pseudocapacitive electrode materials.…”

“…Compared to the restrictions of LIBs including relatively low power, flammable organic electrolyte and long charging time, SCs stands as a forerunner and market leader with many advantages as an alternative source of energy storage mechanism . The main motivation and reason is the fact that the rapid reaction kinetics occurs on or near the surface of the electrode, and thus facilitates very high power density, and long cycling lifespan . The low specific capacitance and energy density of conventional electrical double‐layer capacitors (EDLCs) cannot meet the growing energy demand in a low carbon economy .…”