It remains a challenge to develop simple and mild strategies for synthesizing various Co(OH)2nanostructures on substrates. Inspired by semipermeable membranes, a Celgard membrane was used as an interface for separating components of the precursor solution and for ion exchange, to construct hierarchical Co(OH)2nanostructures. In contrast to traditional solvothermal reactions, this Celgard membrane-based method is simple and effective for preparing high-loading Co(OH)2array (density of approximately 7 mg cm−2) on Ni foam. The permeability of the Celgard membrane was affected by the presenc...
