In this minireview, we discuss different cycloaddition methods to access strained C(sp³)-rich bicyclic hydrocarbons, which are promising bioisosteres of aromatic rings. Each cycloaddition example is organized by four reaction paradigms, carbene cycloadditions, energy transfer promoted cycloadditions, electron transfer promoted cycloadditions, and cycloadditions occurring through polar pathways. A common theme we observed is strain energy and, where possible, we discuss its involvement.

The asymmetric supercapacitor is fabricated using ZnCo₂O₄ nanohexagon and orange peel-derived activated carbon. The nanohexagon was prepared by a double hydroxide method without employing a structure-directing agent. The chemical activation of carbon is done using KOH. The fabricated cell voltage ranges up to 1.2 V with a capacitance of 64 Fg⁻¹ at 0.25 Ag⁻¹ current density and capacitance retention up to 84.61 % after 10000 cycles.

Recent progress in the nanoscale synthesis of metal-containing nanoscale materials, ultra-high surface area nanoporous materials and other functionalities has exbited a notable significant impact on the field of hydrogen storage, particularly in the realm of storing molecular hydrogen, where these nanomaterials provide increased binding sites on the large surface and in the pores, more extensive surface area and porosity as well depth of physisorption at elevated temperatures may significantly boost H₂ storage capacity.