Morphology Dynamics of Single-Layered Ni(OH)<sub>2</sub>/NiOOH Nanosheets and Subsequent Fe Incorporation Studied by in Situ Electrochemical Atomic Force Microscopy.
basic_science · Level V
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- Record sourced from PubMed, PMID 28991484.
- Also identified by DOI 10.1021/acs.nanolett.7b03313.
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Abstract
Nickel (oxy)hydroxide-based (NiO<sub>x</sub>H<sub>y</sub>) materials are widely used for energy storage and conversion devices. Understanding dynamic processes at the solid-liquid interface of nickel (oxy)hydroxide is important to improve reaction kinetics and efficiencies. In this study, in situ electrochemical atomic force microscopy (EC-AFM) was used to directly investigate dynamic changes of single-layered Ni(OH)<sub>2</sub> nanosheets during electrochemistry measurements. Reconstruction of Ni(OH)<sub>2</sub> nanosheets, along with insertion of ions from the electrolyte, results in an increase of the volume by 56% and redox capacity by 300%. We also directly observe Fe cations adsorb and integrate heterogeneously into or onto the nanosheets as a function of applied potential, further increasing apparent volume. Our findings are important for the fundamental understanding of NiO<sub>x</sub>H<sub>y</sub>-based supercapacitors and oxygen-evolution catalysts, illustrating the dynamic nature of Ni-based nanostructures under electrochemical conditions.