School of Physics and Materials Science, Anhui University, Hefei 230601, P. R. China.
Nanoscale. 2018 Feb 1;10(5):2524-2532. doi: 10.1039/c7nr06712g.
The hierarchical porous structure with phosphorus-doped Ni(OH) (P-Ni(OH)) rods as the core and MnO nanosheets as the shell is fabricated directly by growth on a three-dimensional (3D) flexible Ni foam (NF) via a two-step hydrothermal process. As a binder-free electrode material, this unique hybrid structure exhibits excellent electrochemical properties, including an ultrahigh areal capacitance of 5.75 F cm at a current density of 2 mA cm and great cyclic stability without capacitance loss at a current density of 20 mA cm after 10 000 cycles. Moreover, an all-solid-state asymmetric supercapacitor (AAS) based on a P-Ni(OH)@MnO hybrid structure on Ni foam as the cathode and activated carbon (AC) as the anode is successfully assembled to enhance value the electrochemical properties. The AAS device also shows excellent electrochemical properties including a large potential window of 0∼1.6 V, an areal capacitance is 911.3 mF cm at a current density of 1 mA cm and long-term cycling performance. Meanwhile, the AAS device also delivers a high energy density of 0.324 mW h cm at a power density of 0.8 mW cm; and can easily light colorful light-emitting diode (LED) lights, suggesting that 3D P-Ni(OH)@MnO hybrid composite has promising potential for practical use in high-performance supercapacitors.
具有分级多孔结构的磷掺杂 Ni(OH)（P-Ni(OH)）棒作为核，MnO 纳米片作为壳，通过两步水热法直接在三维（3D）柔性 Ni 泡沫（NF）上生长而成。作为一种无粘结剂的电极材料，这种独特的混合结构表现出优异的电化学性能，包括在 2 mA cm 的电流密度下具有超高的面电容 5.75 F cm，在 20 mA cm 的电流密度下循环 10000 次后电容无损失，具有出色的循环稳定性。此外，基于 Ni 泡沫上的 P-Ni(OH)@MnO 混合结构作为阴极和活性炭（AC）作为阳极的全固态非对称超级电容器（AAS）成功组装，以增强电化学性能。该 AAS 装置还表现出优异的电化学性能，包括 0∼1.6 V 的大电位窗口、在 1 mA cm 的电流密度下的面电容为 911.3 mF cm 和长期循环性能。同时，该 AAS 装置还具有 0.324 mW h cm 的高能量密度，功率密度为 0.8 mW cm；并且可以轻松点亮彩色发光二极管（LED）灯，这表明 3D P-Ni(OH)@MnO 混合复合材料在高性能超级电容器的实际应用中具有广阔的应用前景。
