Urchin-like NiCo₂O₄ hollow microspheres and FeSe₂ micro-snowflakes for flexible solid-state asymmetric supercapacitors

Abstract

FSASCs were designed using a NiCo₂O₄ cathode material with an urchin-like hollow structure and a FeSe₂ anode with a hierarchical snowflake structure, which exhibit satisfactory performances with excellent flexibility, high energy density, and long-term stability.