3D-Printed Zn-Ion Hybrid Capacitor Enabled by Universal Divalent Cation-Gelated Additive-Free Ti3C2 MXene Ink
3D-Printed Zn-Ion Hybrid Capacitor Enabled by Universal Divalent Cation-Gelated Additive-Free Ti3C2 MXene Ink
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DOI：
10.1021/acsnano.0c09646
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发表时间：
2021-02-12
期刊：
影响因子：
17.1
通讯作者：
Sun, Jingyu
中科院分区：
文献类型：
--
作者：
Fan, Zhaodi;Jin, Jia;Sun, Jingyu
构建兼顾高能量/功率密度的水性锌离子混合电容器（ZIC）具有实际意义，但仍然是一个巨大的挑战。在本文中，通过3D打印Ti 3C 2 MXene阴极证明了高电容和长寿命的ZIC，提供了优化的载流子传输，易于电解质渗透和充足的孔隙率。具有理想流变性能的3D可打印无添加剂MXene墨水是通过使用微量二价阳离子的快速凝胶化过程获得的，这克服了去除添加剂所需的繁琐后处理。由此制造的3D打印（3DP）MXene阴极导致双离子存储机制，以协同H+的赝电容行为和Zn 2+的双电层电容行为，这通过一系列原位/非原位电分析表征系统地探测。因此，3DP MXene阴极表现出在0.38 mA cm（-2）下1006.4 mF cm（-2）的有利的面积电容和优异的倍率性能（在10 A g（-1）下184.4 F g（-1）），优于现有技术的ZIC。更令人印象深刻的是，包括3DP MXene阴极和3DP Zn阳极的ZIC全电池提供0.10 mWh cm（-2）/5.90 mW cm（-2）的有竞争力的能量/功率密度以及超长寿命（在10 mA cm（-2）下超过6000次循环的86.5%容量保持率）。
The construction of aqueous Zn-ion hybrid capacitors (ZICs) reconciling high energy/power density is practically meaningful yet remains a grand challenge. Herein, a high-capacitance and long-life ZIC is demonstrated by 3D printing of a Ti3C2 MXene cathode, affording optimized carrier transport, facile electrolyte penetration, and ample porosity. The 3D-printable additive-free MXene ink with desirable rheological property is derived by a fast gelation process employing a trace amount of divalent cations, which overcomes the tedious post-treatments required for additive removal. The thus-fabricated 3D-printed (3DP) MXene cathode results in a dual-ion storage mechanism to synergize pseudocapacitive behavior of H+ and electrical double-layer capacitive behavior of Zn2+, which is systematically probed by a wide suite of in situ/ex situ electroanalytic characterizations. The 3DP MXene cathode accordingly exhibits a favorable areal capacitance of 1006.4 mF cm(-2) at 0.38 mA cm(-2) and excellent rate capability (184.4 F g(-1) at 10 A g(-1)), outperforming the state-of-the-art ZICs. More impressively, ZIC full cells comprising a 3DP MXene cathode and a 3DP Zn anode deliver a competitive energy/power density of 0.10 mWh cm(-2)/5.90 mW cm(-2) as well as an ultralong lifespan (86.5% capacity retention over 6000 cycles at 10 mA cm(-2)).