Magnetization in heazlewoodite Ni-Sn-S electrode by structure engineering for high-performance supercapacitors

The development of advanced electrode materials through structure engineering has attracted a huge interest for high-power and high energy-densities storage devices. Herein, a series of hierarchical Ni3SnxS2-x nanomaterials are synthesized using a feasible hydrothermal method, revealing an interesting structural evolution from Ni3S2 to Ni3Sn2 through Sn doping. The optimized Ni3SnxS2-x is evaluated as an electrode material for supercapacitors, achieving a high capacitance of 2377.78 mF cm-2 at 1 mA cm-2 and excellent rate performance of 1567.78 mF cm-2 at 50 mA cm-2. These excellent properties can be ascribed to the synergetic effect of numerous electro-chemical active sites introduced by Sn doping, as well as improved conductivity due to the hierarchical structure. In addition, the as-prepared Ni3SnxS2-x also exhibits higher-coercivity and lower-saturation magnetization. This work fully demonstrates an effective approach to prepare the functional electrode materials as energy storage devices.