材料科学
超级电容器
过电位
纳米线
电催化剂
析氧
电极
电容
化学工程
电化学
电化学能量转换
纳米技术
纳米片
工程类
物理化学
化学
作者
Jian Zhao,Lina Yang,Huanyu Li,Tianqi Huang,He Cheng,Alan Meng,Yusheng Lin,Peng Wu,Xiangcheng Yuan,Zhenjiang Li
标识
DOI:10.1016/j.matchar.2020.110819
摘要
A typical core-branch [email protected]3Se2/NF nanostructure directly grown on Ni foam as an asymmetric supercapacitor (ASC) electrode and electrocatalyst is prepared employing a facile two-step in-situ growth procedures. The as-synthesized nanoarchitecture is composed of relatively thin Ni3Se2 nanosheets shell and NiSe nanowire arrays core (NiSe NWAs). Thanks to the favorable electric conductivity, high theoretical capacitance and the distinct micro-morphologies of the Ni-based selenide, it can present excellent capacitive performances. More importantly, an ASC constructed utilizing the as-fabricated [email protected]3Se2/NF hybrids as positive electrode and active carbon (AC) as negative electrode can exhibit a large energy density of 45.5 Wh kg−1 at 1.600 kW kg−1. Moreover, it can also show outstanding ultra-long durability with a capacitance retention of ~96.1% after 12,000 cycles. In addition, the as-obtained [email protected]3Se2 catalyst can present favorable electrocatalytic performances for oxygen evolution reaction (OER) with a small overpotential of 281 mV at 10 mA cm−2. Thus, this strategy not only provides an efficient channel to design high-performance electrode materials and electrocatalyst, but also promotes the practical applications of the newly emerged metal selenides nanoarchitectures in energy storage and conversion systems.
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