Self-Templating Synthesis of Cobalt Hexacyanoferrate Hollow Structures with Superior Performance for Na-Ion Hybrid Supercapacitors

Abstract

Prussian blue (PB) and its analogues (PBA), especially with hollow structures, have attracted growing attention from the researchers of energy storage field. Herein, we have developed a facile self-templating method to synthesize hollow-structured cobalt hexacyanoferrate (CoHCF) with controllable morphologies by using water-soluble precursors as templates. The method is versatile and can be extended to synthesize various PB/PBA hollow structures with tunable composition and morphology. Profiting from the unique hollow structure, the CoHCF hollow prisms manifest exceptional electrochemical performance in the NaSO aqueous electrolyte, including a high specific capacitance (284 F g at 1 A g), a high rate capability, and an excellent cycling stability (92% retention after 5000 cycles). A hybrid supercapacitor device assembled with the CoHCF hollow prisms and activated carbon shows a high specific density of 47 W h kg at a specific power of 1000 W kg and stable cycling performance.

Prussian blue and its analogues as advanced supercapacitor electrodes

“…The obtained thin films were found to have a specific capacitance of 350 F/g at 1 A/cm 2 applied current density [83] . Very recently, Xuemin et al [84] discovered an easy method for https://engine.scichina.com/doi/10.1016/j.jechem.2020.03.031 preparing CoHCF with controlled hollow structures using previously reported water-soluble templates; cobalt acetate hydroxide prism, zeolitic imidazolate framework polyhedron (ZIF-67) and coglycerate sphere. The length and width of the as-produced CoHCF hollow prisms were measured as 2.5 μm and 500 nm, respectively, besides, the thickness was 100 nm ( Fig.…”

“…TEM images of COHCF prepared from cobalt acetate hydroxide prism (a), Co-glycerate sphere (b), ZIF-67 (c), CV plots of different scan rates (d), CD curves at different specific currents (e), specific capacitance as a function of specific current (f), and cycling life at the current density 10 A/g (g) of the CoHCF hollow prisms. Reproduced from Ref [84]. with copyright permission from American Chemical Society.…”

General formation of Prussian blue analogue microtubes for high-performance Na-ion hybrid supercapacitors

“…Recently, hollow structures exhibiting the unique structural characteristics of high surface area and low density have aroused huge attention from researchers [1][2][3][4]. Besides, the hollow-structured materials have been extensively applied in many fields (e.g., catalysis, gas/ion adsorption, sensor, electromagnetic shielding, energy storage and conversion) [5][6][7][8][9][10][11]. For the area of energy storage, as compared with the solid or bulk materials, hollow structures exhibit the following advantages.…”

Bimetallic Co2+ and Mn2+ Hexacyanoferrate for Hydrogen Peroxide Electrooxidation and Its Application in a Highly Sensitive Cholesterol Biosensor

“…Both the recognition event and biochemical oxidation of cholesterol have to be transduced into an electrical signal, which is achieved by including an adequate hydrogen peroxide electrocatalyst at the interface. [19][20][21][22][23][24] In particular, bimetallic Prussian blue have been successfully employed for hydrogen storage [17,25] and in heterogeneous catalysis. [9][10][11][12][13] It is worth noting that H 2 O 2 may be also reduced at the surface of electrodes, [14,15] which may also be used as transduction reaction in a biosensor.…”

“…Prussian blue analogues and its composites have been employed in various applications, including electrocatalysis and energy storage. [19][20][21][22][23][24] In particular, bimetallic Prussian blue have been successfully employed for hydrogen storage [17,25] and in heterogeneous catalysis. [18] Though, to the best of our knowledge, this is the first report on the application of a mixedmetals hexacyanometallate in the development of an electrochemical biosensor.…”