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首页> 外文期刊>RSC Advances >In situ self-assembly of Ni3S2/MnS/CuS/reduced graphene composite on nickel foam for high power supercapacitors
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In situ self-assembly of Ni3S2/MnS/CuS/reduced graphene composite on nickel foam for high power supercapacitors

机译：Ni3S2 / MnS / CuS /还原石墨烯复合材料在泡沫镍上的原位自组装，用于大功率超级电容器

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Transition metal sulfides (TMS), as promising electroactive materials for asymmetric supercapacitors, have been limited due to their relatively poor conductivity and cycle stability. Here ternary Ni _(3) S _(2) /MnS/CuS composites were assembled in situ on nickel foam (NF) using a hydrothermal method via electrostatic adsorption of Ni ~(+) , Mn ~(2+) and Cu ~(2+) ions on a reduced graphene (rGO) nanosheet template. The chemical structure was characterized by various analytic methods. Ni _(3) S _(2) /MnS/CuS has spherical morphology assembled from closely packed nanosheets, while Ni _(3) S _(2) /MnS/CuS@rGO has a three-dimensional porous spherical structure with much lower diameter because rGO nanosheets can play the role of a template to induce the growth of Ni _(3) S _(2) /MnS/CuS. At a current density of 1 A g ~(?1) , the specific capacitance was obtained to be 1028 F g ~(?1) for Ni _(3) S _(2) /MnS/CuS, 628.6 F g ~(?1) for Ni _(3) S _(2) /MnS@rGO, and 2042 F g ~(?1) for Ni _(3) S _(2) /MnS/CuS@rGO, respectively. Charge transfer resistance ( R _(ct) ) of Ni _(3) S _(2) /MnS/CuS@rGO (0.001 Ω) was much lower than that of Ni _(3) S _(2) /MnS@rGO by 0.02 Ω, and lower than that of Ni _(3) S _(2) /MnS/CuS by 0.017 Ω. After 5000 cycles, the Ni _(3) S _(2) –MnS–CuS@RGO electrode maintains 78.3% of the initial capacity at 20 A g ~(?1) . An asymmetric supercapacitor was subsequently assembled using Ni _(3) S _(2) /MnS/CuS@rGO as the positive electrode and rGO as the negative electrode. The specific capacitance of asymmetric batteries was maintained at 90.8% of the initial state after 5000 GCD.
机译：过渡金属硫化物（TMS）作为不对称超级电容器的有希望的电活性材料，由于其相对较差的电导率和循环稳定性而受到限制。在此，通过水热方法，通过Ni〜（+），Mn〜（2+）和Cu〜的静电吸附，将三元Ni _（3）S _（2）/ MnS / CuS复合材料原位组装在泡沫镍（NF）上。还原石墨烯（rGO）纳米片模板上的（2+）离子。化学结构通过各种分析方法表征。 Ni _（3）S _（2）/ MnS / CuS具有由紧密堆积的纳米片组装而成的球形形态，而Ni _（3）S _（2）/ MnS / CuS @ rGO具有三维多孔球形结构，具有很多较小的直径，因为rGO纳米片可以起模板的作用，诱导Ni_（3）S_（2）/ MnS / CuS的生长。在1 A g〜（？1）的电流密度下，对于Ni _（3）S _（2）/ MnS / CuS，628.6 F g〜（对于Ni _（3）S _（2）/ MnS @ rGO，α1），对于Ni _（3）S _（2）/ MnS / CuS @ rGO，分别为2042 F g〜（？1）。 Ni _（3）S _（2）/ MnS / CuS @ rGO（0.001Ω）的电荷转移电阻（R _（ct））远低于Ni _（3）S _（2）/ MnS @的电荷转移电阻rGO降低0.02Ω，比Ni _（3）S _（2）/ MnS / CuS降低0.017Ω。在5000次循环之后，Ni _（3）S _（2）–MnS–CuS @ RGO电极在20 A g〜（？1）时保持初始容量的78.3％。随后使用Ni _（3）S _（2）/ MnS / CuS @ rGO作为正电极，rGO作为负电极组装非对称超级电容器。 5000 GCD后，不对称电池的比电容保持在初始状态的90.8％。

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