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首页> 外文期刊>ACS applied materials & interfaces >Hydrothermal Growth of Hierarchical Ni3S2 and Co3S4 on a Reduced Graphene Oxide Hydrogel@Ni Foam: A High-Energy-Density Aqueous Asymmetric Supercapacitor
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Hydrothermal Growth of Hierarchical Ni3S2 and Co3S4 on a Reduced Graphene Oxide Hydrogel@Ni Foam: A High-Energy-Density Aqueous Asymmetric Supercapacitor

机译：还原型氧化石墨烯水凝胶@Ni泡沫上Ni3S2和Co3S4的分层水热生长：高能量密度的水不对称超级电容器

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摘要

Ni foam@reduced graphene oxide (rGO) hydrogelNi(3)S(2) and Ni foam@rGO hydrogelCo(3)S(4) composites have been successfully synthesized with the aid of a two-step hydrothermal protocol, where the rGO hydrogel is sandwiched between the metal sulfide and Ni foam substrate. Sonochemical deposition of exfoliated rGO on Ni foam with subsequent hydrothermal treatment results in the formation of a rGO-hydrogel-coated Ni foam. Then second-time hydrothermal treatment of the dried Ni@rGO substrate with corresponding metal nitrate and sodium sulfide results in individual uniform growth of porous Ni3S2 nanorods and a Co3S4 self-assembled nanosheet on a Ni@rGO substrate. Both Ni@rGONi(3)S(2) and Ni@rGOCo(3)S(4) have been electrochemically characterized in a 6 M KOH electrolyte, exhibiting high specific capacitance values of 987.8 and 1369 F/g, respectively, at 1.5 A/g accompanied by the respective outstanding cycle stability of 97.9% and 96.6% at 12 A/g over 3000 chargedischarge cycles. An advanced aqueous asymmetric (AAS) supercapacitor has been fabricated by exploiting the as-prepared Ni@rGOCo(3)S(4) as a positive electrode and Ni@rGONi(3)S(2) as a negative electrode. The as-fabricated AAS has shown promising energy densities of 55.16 and 24.84 Wh/kg at high power densities of 975 and 13000 W/kg, respectively, along with an excellent cycle stability of 96.2% specific capacitance retention over 3000 chargedischarge cycles at 12 A/g. The enhanced specific capacitance, stupendous cycle stability, elevated energy density, and a power density as an AAS of these electrode materials indicate that it could be a potential candidate in the field of supercapacitors.
机译：Ni泡沫@还原氧化石墨烯（rGO）水凝胶Ni（3）S（2）和Ni泡沫@rGO水凝胶Co（3）S（4）复合材料已成功通过两步水热实验合成，其中rGO水凝胶夹在金属硫化物和泡沫镍之间。剥落的rGO在镍泡沫上的声化学沉积以及随后的水热处理导致形成rGO水凝胶涂层的镍泡沫。然后用相应的金属硝酸盐和硫化钠对干燥的Ni @ rGO基材进行第二次水热处理，可在Ni @ rGO基材上分别均匀地生长多孔Ni3S2纳米棒和Co3S4自组装纳米片。 Ni @ rGONi（3）S（2）和Ni @ rGOCo（3）S（4）均已在6 M KOH电解质中进行了电化学表征，在1.5时分别显示987.8和1369 F / g的高比电容值A / g伴随着在3000个充电放电循环中以12 A / g达到97.9％和96.6％的出色循环稳定性。通过利用准备好的Ni @ rGOCo（3）S（4）作为正电极和Ni @ rGONi（3）S（2）作为负电极，已经制造了一种先进的水不对称（AAS）超级电容器。制成的AAS在高功率密度分别为975和13000 W / kg时分别显示出55.16和24.84 Wh / kg的有希望的能量密度，以及在12 A的3000个充电放电循环中具有96.2％的比电容保持率的出色循环稳定性。 /G。作为这些电极材料的AAS，增强的比电容，惊人的循环稳定性，提高的能量密度和功率密度表明，它可以成为超级电容器领域的潜在候选者。

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