Interlayer Hydrogen-Bonded Metal Porphyrin Frameworks/MXene Hybrid Film with High Capacitance for Flexible All-Solid-State Supercapacitors
Interlayer Hydrogen-Bonded Metal Porphyrin Frameworks/MXene Hybrid Film with High Capacitance for Flexible All-Solid-State Supercapacitors
复制标题
用于柔性全固态超级电容器的高电容层间氢键金属卟啉框架/MXene混合薄膜
DOI：
10.1002/smll.201901351
复制
发表时间：
2019
期刊：
影响因子：
13.3
通讯作者：
Wei Huang
中科院分区：
文献类型：
--
作者：
Weiwei Zhao;Jiali Peng;Weikang Wang;Beibei Jin;Tiantian Chen;Shujuan Liu;Qiang Zhao;Wei Huang
2D金属卟啉框架（MPFs）对于先进的能量存储设备是有吸引力的。然而，MPF的低导电性和低结构稳定性严重限制了其作为具有高性能的柔性自立式电极的应用。在这里，首次提出了一种层间氢键MXene/MPFs膜，通过真空辅助过滤技术将高导电性MXene纳米片插入MPFs纳米片中来克服这些缺点。MXene和MPF的交替插入提供了3D互连的“MPF-to-MXene-to-MPF”导电网络，以加速离子/电子传输速率。同时，层间氢键（F···H O和O···H O）由于对充/放电过程中相分离和结构崩溃引起的体积变化具有良好的耐受性而贡献了高的化学稳定性。协同效应使得MXene/MPFs薄膜在0.1 A g− 1时的电容为326.1 F g− 1，在1 mA cm−2时为1.64 F cm− 2，在1 mA cm− 3时为694.2 F cm− 3，并且耐久性约为30000次循环。柔性对称超级电容器显示出408 mF cm−2的面积电容，20.4 µW h cm−2的面积能量密度，以及7000次循环后95.9%的电容保持率。这项工作为进一步探索柔性储能设备中的2D MOFs铺平了道路。
2D metal‐porphyrin frameworks (MPFs) are attractive for advanced energy storage devices. However, the inferior conductivity and low structural stability of MPFs seriously limit their application as flexible free‐standing electrodes with high performance. Here, for the first time, an interlayer hydrogen‐bonded MXene/MPFs film is proposed to overcome these disadvantages by intercalation of highly conductive MXene nanosheets into MPFs nanosheets via a vacuum‐assisted filtration technology. The alternant insertion of MXene and MPFs affords 3D interconnected “MPFs‐to‐MXene‐to‐MPFs” conductive networks to accelerate the ionic/electronic transport rates. Meanwhile, the interlayer hydrogen bonds (F···HO and O···HO) contribute a high chemical stability due to a favorable tolerance to volume change caused by phase separation and structural collapse during the charge/discharge process. The synergistic effect makes MXene/MPFs film deliver a capacitance of 326.1 F g−1at 0.1 A g−1, 1.64 F cm−2at 1 mA cm−2, 694.2 F cm−3at 1 mA cm−3and a durability of about 30 000 cycles. The flexible symmetric supercapacitor shows an areal capacitance of 408 mF cm−2, areal energy density of 20.4 µW h cm−2, and capacitance retention of 95.9% after 7000 cycles. This work paves an avenue for the further exploration of 2D MOFs in flexible energy storage devices.