Three-Dimensional Cobalt Phosphide Nanowire Arrays as Negative Electrode Material for Flexible Solid-State Asymmetric Supercapacitors.
Three-Dimensional Cobalt Phosphide Nanowire Arrays as Negative Electrode Material for Flexible Solid-State Asymmetric Supercapacitors.
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DOI：
10.1021/acsami.7b01109
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发表时间：
2017-05
影响因子：
9.5
通讯作者：
Zhi Zheng;Michael Retana;Xiaobing Hu;R. Luna;Y. Ikuhara;Weilie Zhou
中科院分区：
文献类型：
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作者：
Zhi Zheng;Michael Retana;Xiaobing Hu;R. Luna;Y. Ikuhara;Weilie Zhou
尽管超级电容器已经取得了很大的进展，但正负极材料发展的不平衡仍然是实现高能量密度的关键问题，因此，探索高性能的负极材料是非常必要的。本文在碳布上合成了三维磷化钴(CoP)纳米线阵列，并将其用作无粘结剂的超级电容器负极。在电流密度为1 mA/cm~2时，合成的CoP纳米线阵列的电容达到571.3 mF/cm~2。以CoP纳米线阵列为负极，MnO_2纳米线阵列为正极，制备了柔性固态非对称超级电容器，并表现出了优异的电化学性能，如0.69MWh/cm~3的高能量密度和114.2 mW/cm~3的高功率密度。此外，固态非对称超级电容器表现出很高的循环稳定性，在5000次充放电循环后容量保持率达到82%。这项工作表明，CoP是一种很有前途的高性能超级电容器负极材料。
Despite the great progress that has been accomplished in supercapacitors, the imbalance of the development of positive and negative electrode materials still remains a critical issue to achieve high energy density; therefore, exploring high-performance negative electrode materials is highly desirable. In this article, three-dimensional cobalt phosphide (CoP) nanowire arrays were synthesized on a carbon cloth and were utilized as a binder-free supercapacitor negative electrode. The as-synthesized CoP nanowire arrays presented a high capacitance of 571.3 mF/cm2 at a current density of 1 mA/cm2. By using CoP nanowire arrays as the negative electrode and MnO2 nanowire arrays as the positive electrode, a flexible solid-state asymmetric supercapacitor has been fabricated and has exhibited excellent electrochemical performance, such as a high energy density of 0.69 mWh/cm3 and a high power density of 114.2 mW/cm3. In addition, the solid-state asymmetric supercapacitor shows high cycle stability with 82% capacitance retention after 5000 charge/discharge cycles. This work demonstrates that CoP is a promising negative electrode material for high-performance supercapacitor applications.