Freestanding Carbon‐Based Hybrid Anodes for Flexible Supercapacitors: Part <scp>II</scp> —A Comprehensive Perspective on Active Materials' Composition and Morphology

ABSTRACT Flexible supercapacitors with hybrid anodes have emerged as a pivotal research focus in energy storage, showcasing remarkable potential for specific capacitance, power density, and flexibility. This part of the review focuses on freestanding carbon‐based hybrid anodes, examining the composition, morphology, and surface modification strategies of metal‐based active materials, including oxides, sulfides, phosphides, and other compounds. These diverse metal‐based compounds are employed to fabricate efficient supercapacitors, encompassing both symmetric and asymmetric configurations. This review presents a comprehensive summary of metal‐based compounds utilized as active redox materials for anodes, along with modifying strategies that elevate their electrochemical performance. This review also summarizes how the proposed materials classes, their structural features, and surface engineering properties affect the electrochemical properties, including charge storage, mechanical integrity, and cyclic stability. Besides, the key strategies for enhancing active sites, conductivity, and device flexibility are also presented, providing a comprehensive perspective to guide the design of efficient, real‐world flexible supercapacitor electrodes. This article is categorized under: Emerging Technologies &gt; Energy Storage Emerging Technologies &gt; Materials