Battery-supercapacitor hybrid (BSH) devices are regarded as promising energy storage systems to accomplish remarkable electrochemical properties with high energy and power performances. In this work, mixed Co-Cd selenide (Co-Cd-Se) nanorods are fabricated on nickel foam via a two-step hydrothermal route. The obtained selenide shows a specific capacity of 124 mAh g⁻¹ at a high current density of 20 A g⁻¹, and 95.3% capacity retention can be obtained after cycling 1000 times at 2 A g⁻¹. This excellent performance suggests its potential application as a superior cathode in BSH systems. By paring the prepared Co-Cd-Se cathode with a carbon-coated Fe nanoparticle anode, an alkaline aqueous BSH system is assembled, which shows high energy/power density with good cycling stability. Two cells in series can easily light a light-emitting diode lamp brightly, further demonstrating the high energy storage capability of the prepared Co-Cd-Se mixed selenide material.

电池-超级电容器混合（BSH）器件被视为有前途的储能系统，可实现出色的电化学性能以及高能量和功率性能。在这项工作中，通过两步水热法在泡沫镍上制备了混合的Co-Cd硒化物（Co-Cd-Se）纳米棒。所获得的硒化物在20 A g ^-1的高电流密度下的比容量为124 mAh g ^-1，在2 A g ^-1循环1000次后，可获得95.3％的容量保持率。这种优异的性能表明其潜在的应用作为BSH系统中优异的阴极。通过将制得的Co-Cd-Se阴极与碳包覆的Fe纳米颗粒阳极配对，可组装碱性BSH水系，该系统显示出高能量/功率密度和良好的循环稳定性。两个串联的电池可以容易地使发光二极管灯明亮地发光，进一步证明了所制备的Co-Cd-Se混合硒化物材料的高能量存储能力。