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Moss-like nickel-cobalt phosphide nanostructures for highly flexible all-solid-state hybrid supercapacitors with excellent electrochemical performances
Applied Materials Today ( IF 8.3 ) Pub Date : 2020-06-09 , DOI: 10.1016/j.apmt.2020.100713
Guangmeng Qu , Pengxiao Sun , Guotao Xiang , Jiangmei Yin , Qin Wei , Chenggang Wang , Xijin Xu

Energy storage devices with high security, stability and flexibility are desirable for newly smart wearable electronics. Herein, the moss-like nickel cobalt bimetallic phosphides (Ni-Co-P) nanosheet arrays on carbon fabrics are rationally designed and synthesized, which are directly treated as the electrodes to assemble highly flexible all-solid-state hybrid supercapacitors. The synthesized Ni-Co-P nanosheet arrays exhibit outstanding electrochemical performance and excellent stability owing to architectural advantages and compositional synergistic effect, which are further theoretically supported by calculations with density functional theory (DFT). The as-assembled hybrid supercapacitors deliver a high energy density of 48.4 Wh kg−1 at 811.2 W kg−1 accompanying a satisfactory cyclic stability (about 88.8 % retention after 8000 cycles). What's more, there is no obvious decline for the capacitance after bending 1,000 times under different bending states, implying excellent flexibility and mechanical stability of these bio-inspired nanosheet arrays. The outstanding mechanical stability and electrochemical performance demonstrate the promising potential of the hybrid supercapacitor as energy storage devices.



中文翻译:

苔藓状的镍钴磷纳米结构,用于具有优异电化学性能的高柔性全固态混合超级电容器

具有高安全性,稳定性和灵活性的能量存储设备对于新的智能可穿戴电子设备是理想的。本文对碳纤维织物上的苔藓样镍钴双金属磷化物(Ni-Co-P)纳米片阵列进行了合理设计和合成,将其直接作为电极组装高柔性全固态混合超级电容器。合成的Ni-Co-P纳米片阵列由于具有结构优势和成分协同效应而具有出色的电化学性能和稳定性,这在密度泛函理论(DFT)的计算中得到了进一步的理论支持。组装后的混合超级电容器在811.2 W kg -1时可提供48.4 Wh kg -1的高能量密度并具有令人满意的循环稳定性(8000次循环后保留率约为88.8%)。而且,在不同的弯曲状态下弯曲1000次后,电容没有明显下降,这意味着这些受生物启发的纳米片阵列具有出色的柔韧性和机械稳定性。出色的机械稳定性和电化学性能证明了混合超级电容器作为储能设备的潜力。

更新日期:2020-06-09
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