Nickel sulfide possesses ultra-high theoretical energy storage capacity. Though it is easily obtained, it is very difficult to exert its intrinsic strong capacity. In this work, a new strategy based on a binary synergy of sulfur sources is introduced. By regulating the molar ratio of two sulfur sources, a high-performance α-NiS/Ni₃S₄ binary hybrid is successfully synthesized. Interestingly, it is found that changing the molar ratio of two sulfur sources in hydrothermal process can efficiently regulate the components of product but cannot visibly affect its morphology. The electrochemical results indicate that this strategy is highly effective for improving the performance of nickel sulfide. As a result, a highest specific capacity of 214.9 mAh g⁻¹ at 2 A g⁻¹ was reached. In addition, the fabricated S3//rGO hybrid supercapacitor displays a highest energy density of 41.9 Wh kg⁻¹ at a power density of 799.0 kW kg⁻¹. Moreover, the device delivers an excellent cycle stability with 103% capacity retention rate after 10,000 cycles. These findings open a new avenue for the controlled synthesis of high-performance nickel sulfides or other metal sulfides.

硫化镍具有超高的理论储能能力。尽管很容易获得，但很难发挥其内在的强大能力。在这项工作中，提出了一种基于硫源的二元协同作用的新策略。通过调节两种硫源的摩尔比，成功合成了高性能的α-NiS/ Ni ₃ S ₄二元杂化物。有趣的是，发现在水热过程中改变两种硫源的摩尔比可以有效地调节产物的组分，但是不能明显地影响其形态。电化学结果表明，该策略对于改善硫化镍的性能非常有效。结果，在2 A g时的最高比容量为214.9 mAh g ^-1达到^-1。另外，所制造的S3 // rGO混合超级电容器在799.0kW kg ^-1的功率密度下显示出41.9 Wh kg ^-1的最高能量密度。此外，该器件在10,000次循环后仍具有103％的容量保持率，从而具有出色的循环稳定性。这些发现为高性能合成硫化镍或其他金属硫化物的受控合成开辟了新途径。