Although porous materials based on coordination compounds, including metal-organic frameworks (MOFs) and porous coordination polymers (PCPs), have well-defined pore structures and promising properties, they can efficiently be prepared by conventional and facile methods. Among coordination compounds, Prussian blue (PB) and its analogues (PBA) show high physical/chemical properties and potential as a multifunctional platform for various applications such as information records, sensing, batteries, biomedicine, imaging, and water purification. This review introduces versatile paths for nano- and meso-structural controls and demonstrates strong relationship between nanoarchitectures and properties with regard to PB and PBAs. This review will provide some guidance for future derivations of nanoarchitectonics based on coordination compounds which are PB and PBA.
the volume expansion of electrodes, poor impact resistance, high potential for gas production, easy corrosion of aluminum foil and oxidation of copper foil. Liquid electrolytes show poor compatibility with electrodes in some potential high-energy batteries. Other drawbacks of liquid electrolytes derive from the unstable longterm life cycle and poor performance in restraining the growth of lithium dendrites in LIBs, especially when lithium metal is used as an anode. Some potential cathodes, including transition metals, polysulfides in sulfur electrodes, and organic electrodes, tend to dissolve in liquid electrolytes, hindering the development of next-generation batteries. [1][2][3][4] Solid polymer electrolytes (SPEs) are considered a prospective approach to solving the above problems. [4] An alkali metal salt and polymer host, which plays a role as a solid matrix, form SPEs without additional organic liquid solvents. [5] Several outstanding advantages have been produced by SPEs over conventional liquid electrolytes such as low flammability, low electrolytes leakage, safety, high flexibility, and high stability between the electrode and electrolytes, etc. [6] Furthermore, SPEs possess excellent advantages over inorganic solid electrolytes, such as flexibility, light weight, ease of processing, suitability for large-scale manufacturing, and strong adhesion to electrodes. More importantly, the flexibility of polymer structural design and the suitability of various lithium salts and functional fillers provide many options for SPE design. [6][7][8] Among SPEs, high molecular weight polyethylene oxide (PEO)-based SPEs are commonly considered to be the finest candidates for polymer matrices due to their solvation power and complexation ability. [9] Wright et al. discovered that PEO can be used as a conductive matrix for alkali metal ions. [10,11] In 1983, Armand et al. reported the first PEO/Li + dry SPE system for LIBs (≈10 −4 S cm −1 at 40-60 °C). [12] Their pioneering work constituted a major breakthrough in the research on solid-state lithium-ion batteries (SSLIBs). Since then, polymers have attracted widespread attention as electrolytes for rechargeable SSLIBs. [8,[12][13][14] In LIBs, the SPE acts as an ion-conducting medium operating between the anode and cathode, and it plays the role of an electronically insulating separator. SPEs that meet these criteria should have six characteristics. [5][6][7][8] i) High ionic conductivity (σ) and high Li + transference numbers (t Li+ ). The polymers of SPEs must be able to dissolve sufficient amounts of lithium Solid-state polymer electrolytes (SPEs) for high electrochemical performance lithium-ion batteries have received considerable attention due to their unique characteristics; they are not prone to leakage, and they exhibit low flammability, excellent processability, good flexibility, high safety levels, and superior thermal stability. However, current SPEs are far from commercialization, mainly due to the low ionic conductivity, low Li + transference number (t Li+ ), ...
to their inherent merits of fast charge/ discharge rate, high power output, long cycle lifetimes, and lightweight. [3][4][5] However, the main bottleneck in the development of supercapacitors is to increase their energy density without sacrificing power density so that they can compete with rechargeable batteries. [6][7][8] Bimetallic copper-cobalt sulfide (CuCo 2 S 4 ) is a potentially promising battery-type electrode material for high energy storage applications, owing to their richer Faradaic redox reactions and better redox reversibility relative to corresponding mono-component sulfides and oxides. [9] Unfortunately, the reactivity kinetics of CuCo 2 S 4 is hindered by the slow ionic/electron transport. Up to now, extensive research on CuCo 2 S 4 nanostructures has been carried out, including hybridization with highly conductive skeletons to increase the exposed electrochemically active sites and nanostructuring to reduce the particle size. [10,11] Nevertheless, the electrochemical performance of these CuCo 2 S 4 -based nanostructures is still far below expectations, because these methods cannot fundamentally modulate their electrical properties while ion diffusion barriers have not been specifically addressed.Recently, anion defect engineering has been investigated to tune the electronic structure and the surface chemical properties of active materials. [12,13] This is because vacancies serving as donors can tune the charge density distribution to triggerThe ORCID identification number(s) for the author(s) of this article can be found under
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