Development of renewable energies is in parallel with improving high-performance energy storage devices, which can store maximum solar or wind energy and power. Herein, asymmetric energy storage systems are constructed from phosphorus-doped nickel sulfide (P-doped NiS) and biomass-derived humic acid (HA) as positive and negative electrodes, respectively. Initially, nickel sulfide (NiS) nanostructures are directly grown onto nickel foam (NF) via a hydrothermal step. P-doping into the NiS bulk is carried out through a simple hydrothermal process as well. Also, HA is activated via carbonization treatment (A-HA) for employing as the negative electrode's active material. The P-doped NiS–NF delivers a considerable specific capacity of 486.7 mA h g⁻¹ at 6 A g⁻¹ and the A-HA–NF exhibits a specific capacitance of 163.3 F g⁻¹ at 0.1 A g⁻¹. The assembled asymmetric supercapacitor (ASC) benefits from a wide operating potential window (1.6 V), remarkable energy density (36.32 W h kg⁻¹), and reasonable power density (199.95 W kg⁻¹). The promising electrochemical behavior endows the ASCs with significant applications in electrochemical energy storage systems.

中文翻译：

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直接制备掺磷硫化镍和生态友好的生物质衍生腐植酸作为储能应用的高效电极

可再生能源的发展与高性能储能装置的改进并行，可以最大限度地存储太阳能或风能和电力。在此，不对称储能系统分别由磷掺杂硫化镍（P掺杂 NiS）和生物质衍生的腐植酸（HA）作为正极和负极构成。最初，硫化镍 (NiS) 纳米结构通过水热步骤直接生长在泡沫镍 (NF)上。对 NiS 块体的 P 掺杂也是通过简单的水热过程进行的。此外，HA通过碳化处理 (A-HA)活化，用作负极的活性材料。P 掺杂的 NiS-NF在 6 A g 下提供了 486.7 mA hg ^-1的相当大的比容量^-1和 A-HA-NF在 0.1 A g ^{-1 时}表现出 163.3 F g ^-1的比电容。组装的非对称超级电容器 (ASC) 受益于宽工作电位窗口 (1.6 V)、显着的能量密度 (36.32 W h kg ^-1 ) 和合理的功率密度 (199.95 W kg ^-1 )。有前途的电化学行为赋予 ASCs 在电化学储能系统中的重要应用。