Abstract
AbstractTwo series of hierarchically Ni/NiO@C hollow‐fibers with magnetic, adsorptive, and electrocatalytic oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) properties are successfully prepared via a facile and green cotton fiber (CF)‐templated dipping/adsorbing‐calcining strategy. The effect of calcination temperature and CF amount on morphologies, components, and properties of the as‐prepared materials is investigated. The results demonstrate that a proper CF template can endow the as‐obtained materials with hierarchically hollow‐fiber morphology and multi‐components (Ni0, NiO, and C) at a certain calcination temperature, therefore providing excellent magnetic, adsorptive, and electrocatalytic OER and HER properties. Specifically, the unique hierarchical morphology and synergistic effect between Ni0 and NiO remarkably enhance OER and HER properties of as‐prepared samples. This strategy is low‐cost, simple, eco‐friendly, and could be extended to prepare other composites with multi‐components and functionalities.
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