Vertically aligned ZnCo2O4 nanoplates on Ti3C2 for high-efficiency hybrid supercapacitors
Vertically aligned ZnCo2O4 nanoplates on Ti3C2 for high-efficiency hybrid supercapacitors
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Ti3C2 上垂直排列的 ZnCo2O4 纳米板用于高效混合超级电容器
DOI：
10.1039/d1nj05585b
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发表时间：
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影响因子：
3.3
通讯作者：
Conghui Si
中科院分区：
文献类型：
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作者：
Hao Wang;Yu Zhang;Enyan Guo;Chengge Hu;Qifang Lu;Mingzhi Wei;Jingyun Ma;Conghui Si
表现出更高结构稳定性和电化学活性的电极材料仍然是改善超级电容器（SC）电化学性能的优先事项。在此，我们报告了一种新型的纳米片上纳米片结构的设计和合成，该结构具有垂直排列的ZnCo 2 O 4（ZCO）多孔纳米片，其锚定在无定形脱层的Ti 3C 2（d-TC）纳米片上，作为电化学SC的高性能电极。独特的强大的纳米板对纳米片的粘附力保证了快速的电子和离子传输，大的电活性表面积和优异的结构稳定性。重要的是，得益于这种配置的特征，ZCO/d-TC-350复合电极在1 A g-1的电流密度下显示出195.8 C g-1的高比容量。此外，构建的由ZCO/d-TC-350组成的混合超级电容器（HSC）||活性炭（AC）在551.1 W kg− 1的功率密度下实现了15.6 W h kg− 1的高能量密度，并在4000次循环后实现了89.5%的电容保持率的上级长期稳定性。这项工作为制备用于电化学电容器的先进MXene基电极提供了一种有前途的策略。
Electrode materials exhibiting higher structural stability and electrochemical activity remain a priority in improving the electrochemical performance of supercapacitors (SCs). Herein, we report the design and synthesis of a novel nanoplate-on-nanosheet architecture with vertically aligned ZnCo2O4 (ZCO) porous nanoplates anchored on ultrathin delaminated-Ti3C2 (d-TC) nanosheets as a high-performance electrode for electrochemical SCs. The unique robust nanoplate-on-nanosheet adhesion promises fast electron and ion transport, large electroactive surface area, and excellent structural stability. Importantly, benefiting from the features of such a configuration, the ZCO/d-TC-350 composite electrode displays a high specific capacity of 195.8 C g−1 at a current density of 1 A g−1. Moreover, the constructed hybrid supercapacitor (HSC) consisting of ZCO/d-TC-350||active carbon (AC) achieves a high energy density of 15.6 W h kg−1 at a power density of 551.1 W kg−1 and superior long-term stability with 89.5% capacitance retention after 4000 cycles. This work provides a promising strategy for the preparation of advanced MXene-based electrodes for electrochemical capacitors.