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Transition metal sulfides such as NiS and Co9S8 are gaining popularity in electrochemical capacitors owning to low-cost, earth-abundant, and environmentally friendly nature, but their specific capacity/capacitance should be further improved. Here, by doping Al atoms into β-NiS mesoporous nanoflowers, we achieve reversible specific capacity of 697.3Cg−1 at a current density of 1Ag−1, while the pure...
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