Nanostructured CoNi2S4 materials with different morphologies were successfully grown on carbon cloth through a facile precursor transformation method by adjusting the anions in nickel cobalt salts. The resulting samples were characterized by XRD, EDS, FESEM, and TEM and were found to display different morphologies. Their electrochemical performance was investigated by means of cyclic voltammetry (CV), galvanostatic charge–discharge, electrochemical impedance spectroscopy (EIS), and cycle life. The as‐obtained CoNi2S4 sample with NO3− as the anion in the nickel cobalt salt displayed an ultrahigh specific capacitance of 2714 F g−1 at 1 A g−1 and excellent rate capability (64.8 % capacity retention at 20 A g−1). However, the as‐obtained CoNi2S4 samples with SO42− and Cl− as the anions in the precursors displayed a limited specific capacitance of only 1750 and 1334 F g−1, respectively. Besides, they also displayed different performances in the cycle life test. The study indicates that the as‐obtained CoNi2S4 grown on carbon cloth prepared with NO3− as the anion will be a promising electrode material for supercapacitors.

One-dimensional NiMoO 4 · xH 2 O nanorods were synthesized by a facile template-free hydrothermal method as a potential electrode material for supercapacitors. The influences of reaction temperature, reaction time, and nickel source on the properties of resultant samples were investigated. Electrochemical data reveal that the as-synthesized one-dimensional NiMoO 4 · xH 2 O nanorod superstructures can deliver a remarkable specific capacitance (SC) of 1131 F g −1 at a current density of 1 A g −1 and remain as high as 914 F g −1 at 10 A g −1 in a 6 M KOH aqueous solution. Moreover, there is only 6.2 % loss of the maximum SC after 1000 continuous charge-discharge cycles at the high current density of 10 A g −1 . Such outstanding electrochemical performance may be owing to the unique one-dimensional hierarchical structures, which can facilitate the electrolyte ions and electrons to easily contact the NiMoO 4 nanorod building blocks and then allow for sufficient faradaic reactions to take place, even at high current densities.

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Novel flower-like CoNi2S4/CNT composites are prepared by the precursor transformation method. Ultrahigh specific capacitance and good rate capability are achieved. The desirable mesoporous structure and high conductivity give the superior performance.