title: Ultrathin and lightweight 3D free-standing Ni@NiO nanowire membrane electrode for a supercapacitor with excellent capacitance retention at high rates.
abstract: A free-standing binder-free 3D Ni@NiO nanowire membrane is fabricated by a simple filtration method followed by thermal annealing. With an appropriate annealing temperature, the functional nanowires can keep their rough and echinate surface, and the conductive network composed of welded nickel nanowire cores is well-preserved without isolation (0.53 Ω/sq). The unique 3D multigrade mesporous structure not only accelerates the intercalation and deintercalation velocity of electrolyte ions but also provides numerous electroactive sites for the Faraday reaction. As a result, the supercapacitor electrode can preserve a capacitance retention of 96.1% (36.9 F/cm(3)) with a high discharge current density, indicating its wonderful rate capability. The fabricated membrane electrode exhibits high volumetric capacitance, stable cycling life, and remarkable retention of the capacitance at high rate, energy, and power density, making it a promising candidate for application in portable electronic products.
authors: Center for Nanoscale Characterization & Devices (CNCD), Wuhan National Laboratory for Optoelectronics (WNLO)-School of Physics, Huazhong University of Science and Technology (HUST) , 1037 Luoyu Road, Wuhan 430074, China.
authors: Nishuang
authors: N
authors: Liu
authors: Jian
authors: J
authors: Li
authors: Wenzhen
authors: W
authors: Ma
authors: Weijie
authors: W
authors: Liu
authors: Yuling
authors: Y
authors: Shi
authors: Jiayou
authors: J
authors: Tao
authors: Xianghui
authors: X
authors: Zhang
authors: Jun
authors: J
authors: Su
authors: Luying
authors: L
authors: Li
authors: Yihua
authors: Y
authors: Gao