Vertically stacked thorn-like nanostructured NiCo₂S₄ arrays are designed to in-situ grow on the electrochemical oxidized graphite paper by a two-step hydrothermal method where graphite papers act as heterogeneous nuclear sites to rationally construct the unique features of NiCo₂S₄. Bimetal synergistic effect and the presence of sulfur atoms can improve the ionic and electron conductivity of NiCo₂S₄. The unique structure of NiCo₂S₄ fabricated in such way can allow more active sites exposed to reversible redox reactions, as well as provide relatively short ions/electrons transport pathways within the broken crystal structure and rich porous structure. As such, graphite paper supported NiCo₂S₄ as a self-supported electrode (NiCo₂S₄@EGP) shows an extraordinarily high rate capability with the specific capacitance of 1276 F g⁻¹ at 1 A g⁻¹, and even 1218 F g⁻¹ at 20 A g⁻¹, as well as the excellent cycle stability with capacitance retention of 86 % after 5000 cycles. When assembling into a flexible asymmetric all-solid-state supercapacitor device, this device reaches a high-power density of 55.3 Wh kg⁻¹ at a power density of 747.6 W kg⁻¹, together with a superior high cycle stability (retained 95 % in 5000 cycles). These results obviously open interesting perspectives of using NiCo₂S₄@EGP as self-supported electrodes to become an advanced flexible power device.

垂直堆叠的刺状纳米结构NiCo ₂ S ₄阵列旨在通过两步水热法在电化学氧化石墨纸上原位生长，其中石墨纸充当异质核位点以合理构建NiCo ₂ S ₄的独特特征. 双金属协同效应和硫原子的存在可以提高NiCo ₂ S ₄的离子和电子电导率。NiCo ₂ S ₄的独特结构以这种方式制造的材料可以让更多的活性位点暴露于可逆的氧化还原反应，并在破碎的晶体结构和丰富的多孔结构内提供相对较短的离子/电子传输路径。这样，石墨纸支持镍钴₂小号₄作为自支撑电极（镍钴₂小号₄ @EGP）示出的1276 F G比电容格外高的倍率性能^-1 1个A G ^-1，甚至1218 F g ^-1在 20 A g ^-1，以及出色的循环稳定性，5000 次循环后电容保持率为 86%。当组装成柔性非对称全固态超级电容器装置时，该装置在 747.6 W kg ^-1的功率密度下达到 55.3 Wh kg ^-1的高功率密度，以及卓越的高循环稳定性（保留 95 %在 5000 次循环中）。这些结果显然开启了使用NiCo ₂ S ₄ @EGP 作为自支撑电极成为先进柔性功率器件的有趣视角。