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Porous electrodes are fast emerging as essential components for next‐generation supercapacitors. Using porous structures of Co3O4, Mn3O4, α‐Fe2O3, and carbon, their advantages over the solid counterpart is unequivocally established. The improved performance in porous architecture is linked to the enhanced active specific surface and direct channels leading to improved electrolyte interaction with the redox‐active sites. A theoretical model utilizing Fick's law is proposed, that can consistently explain the experimental data. The porous structures exhibit ∼50%–80% increment in specific capacitance, along with high rate capabilities and excellent cycling stability due to the higher diffusion coefficients.

Porous flower-like SnS2 synthesized using the co-precipitation method can be used as a high-performance electrode material. The obtained 2D-like flake morphologies show excellent electrochemical performance. The performance of such morphologies grossly supersedes the performance of solid morphologies. The reasons are explained in detail. The improved performance of this porous architecture can be attributed to the enhanced active specific surface area with the accessibility of a larger number of redox active sites on the surface, which facilitates electrolyte ion diffusion during electrochemical responses. To explain the experimental results, a theoretical model is being reported, which establishes the role of porosity in the diffusion process of electrolyte ions within such materials. The porous material leads to a ∼50% increase in the specific capacitance, without compromising rate capabilities or cycling stability, making it ideal for next-generation devices.

Aluminum-ion batteries (AIBs) show tremendous promise and advantages, which make them useful for both grid and off-grid energy storage applications. In this paper, an interconnected sheet-like morphology of low-cost V2O5 is reported as a cathode material to improve the capacity, rate capability, and cycling stability of AIBs. The V2O5-based cathode is able to deliver an initial discharge capacity of ∼140 mA h g–1, at a high current density of 0.5 A g–1, with an excellent capacity retention of 96% after 1000 cycles at 1 A g–1, which is among the best cathode performances reported for aqueous AIBs. The fast intercalation and deintercalation of Al3+ between the stacked layers of V2O5 help in ensuring such high-performance characteristics. Notably, the smaller lattice expansion (∼1.4%) of V2O5 indicates that the expansion and contraction of the crystal structure occur reversibly during the charge–discharge process. The stability of the material is established by analyzing the X-ray diffraction patterns of the material after cycling. Such studies have remained ignored in AIBs till date.