Porous nickel-cobalt layered double hydroxide nanoflake array derived from ZIF-L-Co nanoflake array for battery-type electrodes with enhanced energy storage performance
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- 作者：Jingcheng Zhang
- 关键词：nickel-cobalt layered double hydroxide nanoflake array (Ni-Co LDH-NFA) ; leaf-like Co-containing zeolitic imidazolate framworks (ZIF-L-Co) ; ZIF-L-Co nanoflake array (ZIF-NFA) ; battery-type electrodes
- 刊名：Electrochimica Acta
- 出版年：2017
- 出版时间：1 February 2017
- 年：2017
- 卷：226
- 期：Complete
- 页码：113-120
- 全文大小：3727 K
- 卷排序：226
文摘
In view of the complicated synthesis procedures of metallic layered double hydroxides (LDHs) in general preparation, we here report a facile route for synthesizing porous nickel-cobalt layered double hydroxide nanoflake array (Ni-Co LDH-NFA) on nickel foam on the base of our previously reported leaf-like Co-containing zeolitic imidazolate framworks (ZIF-L-Co). The ZIF-L-Co nanoflake array (ZIF-NFA) is first grown on nickel foam, which serves as a sacrificial template to synthesize Ni-Co LDH-NFA when it reacts with nickel nitrate at room temperature. The as-prepared Ni-Co LDH-NFA could be directly used as battery-type electrodes without polymer binder. Due to the highly ordered layered crystal structure of LDH and the well-defined porous nanostructure of nanoflake array, such Ni-Co LDH-NFA electrode exhibits outstanding specific capacity of 894 C g−1 at a current density of 2 A g−1. In addition, an assembled asymmetric supercapacitor device also exhibits excellent specific energy density of 48.6 Wh kg−1 at a specific power density of 1700 W kg−1. Even at a high power density of 17 kW kg−1, the device could still remain an energy density of 18.5 Wh kg−1.