TY - JOUR AU - Zai, Jiantao AU - Liu, Yuanyuan AU - Li, Xiaomin AU - Ma, Zi-feng AU - Qi, Rongrong AU - Qian, Xuefeng PY - 2016/12/27 Y2 - 2024/03/29 TI - 3D Hierarchical Co–Al Layered Double Hydroxides with Long-Term Stabilities and High Rate Performances in Supercapacitors JF - Nano-Micro Letters JA - Nano-Micro Lett VL - 9 IS - 2 SE - Articles DO - 10.1007/s40820-016-0121-5 UR - https://nmlett.org/index.php/nml/article/view/351 SP - 21 AB - <p>Three-dimensional (3D) flower-like Co–Al layered double hydroxide (Co–Al-LDH) architectures composed of atomically thin nanosheets were successfully synthesized via a hydrothermal method in a mixed solvent of water and butyl alcohol. Owing to the unique hierarchical structure and modification by butyl alcohol, the electrochemical stability and the charge/mass transport of the Co–Al-LDHs was improved. When used in supercapacitors, the obtained Co–Al-LDHs deliver a high specific capacitance of 838&nbsp;F&nbsp;g<sup>−1</sup> at a current density of 1&nbsp;A&nbsp;g<sup>−1</sup> and excellent rate performance (753&nbsp;F&nbsp;g<sup>−1</sup> at 30&nbsp;A&nbsp;g<sup>−1</sup> and 677&nbsp;F&nbsp;g<sup>−1</sup> at 100&nbsp;A&nbsp;g<sup>−1</sup>), as well as excellent cycling stability with 95% retention of the initial capacitance even after 20,000 cycles at a current density of 5&nbsp;A&nbsp;g<sup>−1</sup>. This work provides a promising alternative strategy to enhance the electrochemical properties of supercapacitors.</p><p>Highlights:</p><p>1 3D Flower-like Co–Al layered double hydroxides (Co–Al-LDHs) built up of atomically thin nanosheets were successfully synthesized via a hydrothermal method in a mixed solvent of water and butyl alcohol.<br>2 Owing to the unique hierarchical structure and modification by butyl alcohol, the electrochemical stability and the charge/mass transport of the Co–Al-LDHs was improved, therefore leading to high specific capacitance, excellent rate performance and good cycling stability in supercapacitors.</p> ER -