In Situ Synthesis of Rare‐Earth Hybridized Functional Core‐Shell Architectures from Microporous Salt Templates and Capacitance‐Adsorption Correlation Mechanisms

Abstract Biochar Porous Carbon (BPC) has become a research hotspot in the fields of energy storage, conversion, catalysis, adsorption, and separation engineering. However, the key problem of pore structure liable to collapse has not yet been addressed effectively. Here, an innovative salt ionic coordination modulation technique is reported to synthesize a new core‐shell structure of BPC (Dual‐doped porous carbonaceous materials, RHPC3@LaYO 3 ) by the asymmetric load of the f orbital ion, which prevents pore structural collapse. The result shows that the novel asymmetric supercapacitors (ASCs) with an excellent energy density (193.11 Wh·kg −1 ) and capacitance (267.14 F·g −1 ) by assembling the prepared porous BPC carrier and RHPC3@LaYO 3 , which surpass the typical supercapacitor. In order to elucidate the association between adsorption and capacitance, the adsorption coexistence equation (MACE) is constructed with the aim of providing a comprehensive explanation for the mechanism of single‐multilayer adsorption. Furthermore, a specific linkage mechanism is discovered using adsorption/ desorption properties to validate the pros/cons of capacitive properties. These results demonstrate the potential of renewable biomass materials as ASCs, which can provide new ideas for the construction of an evaluation approach for the performance of future efficient multi‐reaction energy storage devices.