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首页> 外文期刊>RSC Advances >Flowery nickel–cobalt hydroxide via a solid–liquid sulphur ion grafting route and its application in hybrid supercapacitive storage
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Flowery nickel–cobalt hydroxide via a solid–liquid sulphur ion grafting route and its application in hybrid supercapacitive storage

机译：固液硫离子接枝的花状镍钴氢氧化物及其在混合超级电容存储中的应用

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In our research, a two-step solid–liquid route was employed to fabricate flowery nickel–cobalt hydroxide with sulphur ion grafting (Ni1Co2–S). The utilization of NaOH/agar and Na _(2) S/agar could efficiently retard the release rates of OH ~(?) or S ~(2?) ions at the solid–liquid interface due to strong bonding between agar hydrogel and these anions. Ni1Co2–S generally displays ultrathin flowery micro-frame, ultrathin internal nanosheets and expanded pore size. Besides, the introduction of suitable sulphide species into nickel–cobalt hydroxide could improve its conductivity due to the lower band gap of Ni–Co sulphide. The supercapacitive electrode Ni1Co2–S presented capacitance of 1317.8 F g ~(?1) (at 1 A g ~(?1) ) and suitable rate performance (77.9% at 10 A g ~(?1) and 59.3% at 20 A g ~(?1) ). Furthermore, a hybrid supercapacitor (HSC) was developed utilizing positive Ni1Co2–S and negative activated carbon electrodes. As expected, the HSC device exhibited excellent specific capacitance (117.1 F g ~(?1) at 1 A g ~(?1) ), considerable energy densities (46.7 W h kg ~(?1) at 0.845 kW kg ~(?1) and 27.5 W h kg ~(?1) even at 9 kW kg ~(?1) ) and suitable cycling performance, which further illuminated the high energy storage capacity of Ni1Co2–S.
机译：在我们的研究中，采用了两步固液路线，通过硫离子接枝（Ni1Co2–S）制备了花状的镍钴氢氧化物。 NaOH /琼脂和Na _（2）S /琼脂的利用可以有效地阻止OH〜（？）或S〜（2？）离子在固液界面上的释放速率，这是由于琼脂水凝胶与这些之间的牢固结合阴离子。 Ni1Co2-S通常显示出超薄的花状微框架，超薄的内部纳米片和扩大的孔径。此外，由于Ni-Co硫化物的带隙较低，因此将合适的硫化物引入镍-氢氧化钴可以提高其电导率。超电容电极Ni1Co2-S的电容为1317.8 F g〜（？1）（在1 A g〜（？1）时）和合适的速率性能（10 A g〜（？1）为77.9％，在20 A时为59.3％ g〜（？1））。此外，利用正极Ni1Co2-S和负极活性炭电极开发了一种混合超级电容器（HSC）。如预期的那样，HSC器件表现出极好的比电容（在1 A g〜（？1）时为117.1 F g〜（？1）），相当大的能量密度（在0.845 kW kg〜（？1时为46.7 W h kg〜（？1））。 1）和27.5 W h kg〜（？1）甚至在9 kW kg〜（？1）时）和合适的循环性能，进一步阐明了Ni1Co2-S的高储能能力。

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