A three-dimensional reduced graphene oxide/nickel-cobalt sulfide (RGO/NiCo₂S₄) aerogel was fabricated by an efficient and facile one-step hydrothermal approach. The NiCo₂S₄ needle-like structure consisted of many small nanoparticles well attached to the surface of the RGO sheet. The prepared aerogel had high porosity and conductivity. As an active electrode material for supercapacitors, the RGO/NiCo₂S₄ aerogel exhibited a large capacitance of 813 F g⁻¹ at 1.5 A g⁻¹. Besides, the asymmetric supercapacitor (RGO/NiCo₂S₄ aerogel//RGO) showed a Cs of 45.3 F g⁻¹ at 1.0 A g⁻¹ and a suitable remaining capacitance of over 84.3 % after 2000 cycles. The asymmetric supercapacitor had a high energy density of 40.3 Wh kg⁻¹ at 375.0 W kg⁻¹ and a power density of 26.2 kW kg⁻¹ at 3.7 kWh kg⁻¹, which suggests this device has great potential applications in energy storage.

三维还原氧化石墨烯/硫化镍钴 (RGO/NiCo ₂ S ₄ ) 气凝胶是通过一种高效、简便的一步水热法制备的。NiCo ₂ S ₄针状结构由许多很好地附着在RGO片表面的小纳米粒子组成。制备的气凝胶具有较高的孔隙率和导电性。作为超级电容器的活性电极材料，RGO/NiCo ₂ S ₄气凝胶 在1.5 A g ^{-1 下}表现出813 F g ^-1的大电容。此外，不对称超级电容器（RGO/NiCo ₂ S ₄气凝胶//RGO）的Cs为45.3 F g ^-1 在 1.0 A g ^-1和 2000 次循环后超过 84.3 % 的合适剩余电容。不对称超级电容器 在 375.0 W kg ^{-1 时}具有 40.3 Wh kg ^-1的高能量密度， 在 3.7 kWh kg ^{-1 时}具有 26.2 kW kg ^-1的功率密度，这表明该器件在储能方面具有巨大的潜在应用。