Pseudocapacitive Materials for Flexible Supercapacitors

Along with the rapid development of flexible and wearable electronics, there has been a strong need for flexible energy storage devices to power these devices. Flexible supercapacitors (FSCs), having the unique characteristics of high-power density, long lifetime, wide operating temperature range, and remarkable safety in a flexible fashion, have been extensively studied for this emerging technology. An ideal FSC would have both superior electrochemical performances and excellent mechanical deformabilities, which require thorough research on the electrode materials and device configurations of FSCs. This chapter reviews the recent progress on these aspects of FSCs. Electrode materials, specifically pseudocapacitive materials (including metal oxides, conducting polymers, and Mxenes) and their composites, of FSCs are firstly elucidated. This is followed by the discussion about the device configurations of pseudocapacitive material-incorporated FSCs, ranging from one-dimensional fiber-shaped to two-dimensional film-shaped and three-dimensional structural. Finally, the practical applications of pseudocapacitive material incorporated FSCs are summarized. In conclusion, the current challenges and future prospects for pseudocapacitive material-incorporated FSCs are discussed.