Understanding MXene-Based “Symmetric” Supercapacitors and Redox Electrolyte Energy Storage

• DOI: 10.1021/acsaem.0c00527
• Publication Date: 2020-04-29T16:31:19Z
• Authors: Yapeng Tian; Chenhui Yang; Yangyang Luo; Hongyang Zhao; Yaping Du; Ling Bing Kong; Wenxiu Que
• Keywords: Pseudocapacitance; Flow battery

With the development of renewable energy sources, supercapacitors (SCs) have drawn considerable attention due to their high rate performance and power density. Ti3C2Tx (MXene) shows an excellent physical chemical nature, making it a promising electrode material for SCs. Here, Ti3C2Tx-based symmetric SCs are examined by employing in situ Raman X-ray diffraction, revealing that redox Ti–O with bonding/debonding hydronium ions occurs negative electrode, while positive mainly involves intercalation pseudocapacitance ions. Meanwhile, results reveal asymmetric split voltage between two electrodes H2SO4 electrolyte. Furthermore, shift open circuit potential is observed because partial oxidation electrode. As result, exhibits much larger capacitance than Thus, strategy proposed introducing redox-active species into traditional The show converted battery-type working range expanded, leading obvious improvement Moreover, density 33.2 Wh L–1 mixed electrolyte, which higher electrolyte (14.3 L–1). Therefore, this method can be used as highly effective improving storage capacity MXene-based