Wang Shiwen, Wang Fang, Wang Peiyuan, Han Lifeng, Wu Shide, Chen Yaqing, Guo Dongjie
State Laboratory of Surface and Interface, Zhengzhou University of Light Industry, Zhengzhou 450002, People's Republic of China.
Nanotechnology. 2020 Nov 20;31(47):475704. doi: 10.1088/1361-6528/abae2d.
A 3D porous graphene composite film containing Ni/NiO hybrid nanoparticles (Ni/NiO NPs) is prepared by combining electrophoresis deposition and thermal H annealing techniques. The Ni/NiO NPs with a mean diameter of 45 nm are uniformly embedded on both the exterior and interior surfaces of reduced graphene, forming a 3D porous reduced graphene oxide composite film (Ni/NiO rGO). The insertion of Ni/NiO NPs into rGO greatly improves the electric conductivity and charge storage capability of the resultant Ni/NiO rGO film. By directly using it as freestanding electrodes, the fabricated lithium-ion battery and supercapacitor respectively exhibited high capacities of 758 mAh g@ 0.2 A g and 430.8 F g@0.5 A g, an increase of 82.3-fold and 20.2-fold compared to the pure rGO electrode-based counterparts under the same condition.
通过结合电泳沉积和热退火技术，制备了一种包含镍/氧化镍混合纳米颗粒（Ni/NiO NPs）的三维多孔石墨烯复合薄膜。平均直径为45纳米的Ni/NiO NPs均匀地嵌入在还原石墨烯的内外表面，形成一种三维多孔还原氧化石墨烯复合薄膜（Ni/NiO rGO）。将Ni/NiO NPs插入rGO中极大地提高了所得Ni/NiO rGO薄膜的电导率和电荷存储能力。通过直接将其用作独立电极，所制备的锂离子电池和超级电容器在0.2 A g和0.5 A g的电流密度下分别表现出758 mAh g和430.8 F g的高容量，与相同条件下基于纯rGO电极的对应物相比分别提高了82.3倍和20.2倍。
