Structural Regulation of Oxygen Vacancy‐Rich K_0.5Mn₂O₄Cathode by Carbon Hybridization for Enhanced Zinc‐Ion Energy Storage

Abstract

High‐voltage manganese‐based materials are considered as promising cathode materials for aqueous zinc‐ion batteries (AZIBs). Herein, oxygen vacancy‐rich K0.5Mn2O4 sheets were anchored uniformly onto honeycomb‐like interconnected carbon nanoflakes (CNF@K0.5Mn2O4) for AZIB cathode applications. In the composite, the CNFs provided excellent intergranular electron transport capability, while the oxygen vacancies enhanced the electron transport efficiency inside crystals, and the embedded K ions expanded the interlayer spacing and stabilized the layered crystal structure. A reversible specific capacity of 241 mAh g−1 could be maintained by the composite at 0.5 A g−1 for 400 cycles. A combination of ex‐situ analytical methods and density functional theory calculations was carried out to elucidate the electrochemical mechanism of reversible zinc storage. In addition, flexible quasi‐solid‐state batteries of Zn//CNF@K0.5Mn2O4 were constructed by substituting the traditional aqueous electrolyte for a quasi‐solid‐state gel electrolyte, which worked efficiently and exhibited high bending durability.

Polyamidoxime (PAO) granules for solar-enhanced uranium extraction from seawater

“…17,23 The FT-IR spectrum results show that the introduced KMnO 4 cannot significantly affect the conversion of PAN to PAO during the amidoximation process. 35…”

“…23 This reveals the high adsorption capabilities of PAO and KMnO 4 for U( vi ). The XPS Mn 2p spectrum of KMnO 4 @PAO can be deconvoluted into Mn 2p3/2 and Mn 2p1/2 peaks 35,37–39 at 641.78 and 653.47 eV, respectively (Fig. 8H).…”

“…17,23 The FT-IR spectrum results show that the introduced KMnO 4 cannot signicantly affect the conversion of PAN to PAO during the amidoximation process. 35 The functional groups on PAO and KMnO 4 @PAO surfaces are veried by XPS spectroscopy. The XPS peaks of O 1s, N 1s, and C 1s were located at ∼532 eV, ∼400 eV, and ∼285 eV, respectively.…”

Advancements, challenges, and applications of rechargeable zinc‐ion batteries: A comprehensive review

“…Cathode materials for ZIBs can exhibit weak conductivity, affecting their overall performance. Consequently, strategies like conductive material hybridization [96] and cationic/anionic doping [12] have been developed. Additionally, defects [97], crystal facets [98], and interface engineering [99] have been identified to enhance electronic conductivity, prevent cathode dissolution, facilitate ion transportation, and modify the battery assembly interface [12, 37, 55].…”