絮状三元镍钴铁氢氧化物电极材料的制备及其电化学储能性能

采用一步溶剂热法在泡沫镍(NF)基底上合成了镍钴氢氧化物、镍铁氢氧化物及镍钴铁氢氧化物3种电极材料,并对其电化学性能进行测试,结果表明:三元镍钴铁金属电极的储能性能要远大于其他2种二元金属电极,其在2 mA·cm-2电流密度下能达到5.11 F·cm-2的面积比电容,并且构筑的非对称超级电容器在功率密度为46.814 ...

Flocculent Ternary Nickel-Cobalt-Iron Hydroxide Electrode Material: Preparation and Performance for Electrochemical Energy Storage

Three electrode materials of nickel - cobalt hydroxide, nickel - iron hydroxide, and nickel - cobalt - iron hydroxide were synthesized on nickel foam (NF) via a one - step solvothermal method. The electrochemical tests showed that the ternary nickel-cobalt-iron metal electrode with the best energy storage performance outperforms the other two binary metal electrodes, and it could reach an area capacitance of 5.11 F·cm^-2 at a current density of 2 mA·cm^-2. To further investigate the practical application, an asymmetric supercapacitor was assembled with NiCoFeOH/NF as the positive electrode and activated carbon as the negative electrode, respectively, and the device achieved a maximum energy density of 5.994 Wh·m^-2 at a power density of 46.814 W·m^-2. The results show that the excellent performance of NiCoFe - OH/NF can be attributed to loosen flocculent structure, which provides larger specific surface area per unit volume and subsequently store more electric charges, as well as facilitate electron/ion transportation, reduce the contact resistance between active material and electrolyte, and increase the electrical conductivity.