Hollow structures Prussian blue, its analogs, and their derivatives: Synthesis and electrochemical energy‐related applications

Abstract

Electrochemistry is an effective way to obtain clean energy and alleviate energy crisis. Compared with solid structures, hollow structures show a larger specific surface area and expose more active sites. Therefore, when applied to the field of electrochemistry, hollow structures can usually show more excellent performance. Because of their unique compositions, Prussian blue and its analogs (PB/PBAs) usually contain two or more kinds of metallic elements, and the synergistic effect between the different metallic elements provides more possibilities for their application in the field of electrochemistry. After easy treatment of PB/PBAs, derived materials, such as transitionmetal oxide, transition-metal phosphide, transition-metal sulfide, and so forth can be obtained. Due to the particularity of PBA composition, these derived materials are usually bimetallic or polymetallic. These derivatives not only inherit the structural advantages of PB/PBAs, but also usually solve the problem of poor conductivity of PB/PBAs. Therefore, derived materials can show more excellent electrochemical performance. In recent years, the preparation and electrochemical application of hollow PB/PBAs and their derivatives have attracted more and more attentions. In this article, the synthesis strategies of hollow PB/PBAs and their derived materials are systematically summarized. The applications of related materials in the field of electrochemistry are introduced in detail. And the prospects and challenges are further analyzed.

Promising Cathode Materials for Sodium-Ion Batteries from Lab to Application

“…Hexacyanoferrates (HCFs)/Prussian blue (PB) and its analogues (PBAs) are promising cathode candidates for SIBs owing to their low cost, easy preparation, and open framework structure for Na + accommodation. ,, The chemical formulas of PBAs could be denoted as Na x M 1 [M 2 (CN) 6 ] y □ 1– y · z H 2 O (0 ≤ x ≤ 2, 0 ≤ y ≤ 1), where M 1 = Fe, Mn, Ni, Cu, Co, Zn, etc. ; M 2 = Fe, Mn, Co; and □ represents a transition metal coordinated with N and C atoms and [M 2 (CN) 6 ] vacancies inside the crystal structure, respectively .…”

“…Hexacyanoferrates (HCFs)/Prussian blue (PB) and its analogues (PBAs) are promising cathode candidates for SIBs owing to their low cost, easy preparation, and open framework structure for Na + accommodation. 6,106,107…”

Routes to high-performance layered oxide cathodes for sodium-ion batteries

“…Since cathodes are the vital component of SIBs, a variety of cathode materials, including polyanionic compounds, 49–51 Prussian blue analogs, 52–55 layered oxides, 56,57 and organic-based materials, 58,59 have been systematically explored, in which transition metal-based layered oxides (Na x TMO 2 , where TM = Fe, Mn, Ni, Co, etc. ) have been extensively studied as the most prospective cathode candidates in SIBs because of their superior specific capacity, comparatively facile preparation technique, and reference to the successful application of LiTMO 2 in LIB systems.…”

Solar-Driven Ion Confinement for Synergetic Pollutants Remediation and Valuable Metal Recovery in Wastewater

“…Using a coordination framework, copper hexacyanoferrate (CuFe Prussian blue analogues (PBA)) as the cathode material enables rapid transfer of photogenerated electrons to the CuFe PBA end. − This process swiftly couples to the insertion and confinement of Cu­(II) under solar irradiation. The coordination polymer framework’s efficient kinetics in accepting photogenerated electrons facilitates effective carrier separation without additional energy consumption. − Unlike previous reports, Cu­(II) can be captured directly from wastewater and stabilized within a confined coordination polymer framework . Simultaneously, this strategy minimizes electron–hole recombination, allowing photogenerated holes at the anode to efficiently decomplex organic substances.…”