“…Among the main materials platforms explored in recent years, MXene [26] , one-dimensional nanostructures [27] , metalorganic frameworks [28] , organic compounds [29] , layered metal oxides [30] , alloys [31] , and carbon-based systems [32] emerged. As regards the latter category, it represents the most studied platform, and recent review articles focused on hard carbons [33] , biomass-derived systems [34] , nanotubes [35] , optimisation strategies [36] , stability [37] , modelling [38] , and flexible electrodes [39] have been published. Also, in-depth studies on potassium-enriched or expanded graphite [40,41] , specific electrolyte formulations [42] , and potassium encapsulation within carbon nanostructures [43] have been published.…”