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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：通过固液硫离子嫁回途径氢化镍钴氢氧化物及其在杂交超级储存中的应用

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摘要

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 Na2S/agar could efficiently retard the release rates of OH- or S2- 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，采用两步固液途径制造具有硫离子嫁接（Ni1CO2-S）的氢硼氧化钴。由于琼脂水凝胶与这些阴离子之间的强键合，NaOH /琼脂和Na2S /琼脂的利用可以有效地阻止在固液界面处的OH-或S2-离子的释放速率。 Ni1CO2-S一般显示超薄的流动微框，超薄内部纳米片和膨胀孔径。此外，由于Ni-Co硫化物的较低带隙，将合适的硫化物物种引入氢氧化钴氢氧化物中的电导率。超级电极Ni1CO2-S呈现的电容为1317.8fg（-1）（以1ag（-1））和合适的速率性能（77.9％，10 a g（-1）和59.3％，在20 a g（ - 1））。此外，利用阳性Ni1CO2-S和阴性活性炭电极进行杂交超级电容器（HSC）。如所预期的，HSC器件在1A（-1））的优异特定电容（117.1V（-1）），相当大的能量密度（46.7WH kg（-1），0.845 kW kg（-1）和27.5 WH kg（-1）即使在9 kW kg（-1））和合适的循环性能下也进一步照亮了Ni1co2-s的高储能容量。

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