Growth and Characterization of 3D Flower‐Like β‐NiS on Carbon Cloth: A Dexterous and Flexible Multifunctional Electrode for Supercapattery and Water‐Splitting Applications

Evolution of 3D nanostructures is luring a great deal of importance owing to their eccentric structures that create plenty of rooms to grasp massive volume of charges. Here, a distinct multifunctional binder‐free flexible electrode is developed by arrays of flower‐like β‐NiS nanostructures over flexible carbon cloth (β‐NiS@CC) by the in situ hydrothermal method. It unveils an ultimate areal capacity of 1.654 C cm−2 (827 C g−1) at 1 mA cm−2, which seems to be the highest among the reported NiS so far. The fabricated flexible supercapattery gadget delivers a remarkable energy density of 38 µWh cm−2 at a power density of 800 µW cm−2. Due to immense mechanical strength and resilience of 3D flower‐like morphology, it is further exposed as an economical bifunctional electrocatalyst. Both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) exhibit a significant burst of the enormous quantity of gas bubbles at the low overpotentials of 320 and 278 mV, respectively, to achieve a current density of 20 mA cm−2. Further, the developed laboratory scale water electrolyzer offers a low cell voltage of 1.65 V to accomplish a water‐splitting current density of 10 mA cm−2. Henceforth, the multifunctional 3D flower‐like β‐NiS electrode is demonstrated by defining its potential use in real‐world appliances.