Biomass‐Templated Preparation of Hierarchically Multi‐Functional Ni/NiO@C Hollow‐Fibers
Bitao Su, Yangchen Wang, Hao Luo, Ming Zhong, Ziqiang Lei
Abstract
Abstract Two 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 (Ni 0 , 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 Ni 0 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.