In this work, the core‐shelled Sb@Sb2O3 heterostructure encapsulated in 3D N‐doped carbon hollow‐spheres is fabricated by spray‐drying combined with heat treatment. The novel core‐shelled heterostructures of Sb@Sb2O3 possess a mass of heterointerfaces, which formed spontaneously at the core‐shell contact via annealing oxidation and can promote the rapid Na+/K+ transfer. The density functional theory calculations revealed the mechanism and significance of Na/K‐storage for the core‐shelled Sb@Sb2O3 heterostructure, which validated that the coupling between the high‐conductivity of Sb and the stability of Sb2O3 can relieve the shortcomings of the individual building blocks, thereby enhancing the Na/K‐storage capacity. Furthermore, the core‐shell structure embedded in the 3D carbon framework with robust structure can further increase the electrode mechanical strength and thus buffer the severe volume changes upon cycling. As a result, such composite architecture exhibited a high specific capacity of ≈573 mA h g−1 for sodium‐ion battery (SIB) anode and ≈474 mA h g−1 for potassium‐ion battery (PIB) anode at 100 mA g−1, and superior rate performance (302 mA h g−1 at 30 A g−1 for SIB anode, while 239 mA h g−1 at 5 A g−1 for PIB anode).
Using differential thermal analysis (DTA) to determine solvus temperature of precipitated phases in a Nb-hardened superalloy, such as alloy 718, is relatively difficult. The precipitation reaction is not significantly pronounced, and the baseline of a DTA thermogram is not clearly defined. A new approach was employed in this study, which utilized a solution-treated Inconel alloy 7 18 as the reference instead of the conventional alumina. The samples for analysis were preaged at various temperatures to develop specific precipitate phases. The DTA thermograms showed a well-defined baseline because of similar alloy chemistry and heat capacity between the sample and the reference. The offset of thermal peaks associated with precipitate dissolution can be accurately determined.
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