Electrochemical Growth of Mg(OH)xLayered Films Stacked Parallel to the Substrates and Their Thermal Conversion to (111)-Oriented Nanoporous MgO Films

Abstract

Stacking layered metal hydroxide films parallel to a substrate is challenging. Here, we demonstrate a simple and rapid electrodeposition method for stacking magnesium hydroxide layered films. Room-temperature cathodic electrolysis (40 mA cm-2) in a Mg(NO3)2 aqueous solution induces the deposition of 001-oriented Mg(OH)x layered films stacked parallel to the substrate at the deposition rate of ∼2 μm min-1. The obtained Mg(OH)x layered films undergo an overall oriented transformation by heat treatment to form 111-oriented nanoporous MgO films.