期刊
NANO LETTERS
卷 17, 期 11, 页码 6922-6926出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b03313
关键词
Ni(OH)(2); EC-AFM; supercapacitor; oxygen evolution reaction; Fe incorporation
类别
资金
- Zhejiang University
- National Key R&D Program of China [2016YFA0202900]
- National Natural Science Foundation of China [21622308]
- NSF Major Research Instrumentation Program [DMR-1532225]
- W. M. Keck Foundation
- M. J. Murdock Charitable Trust
- ONAMI
- Air Force Research Laboratory
- National Science Foundation
- University of Oregon
- National Science Foundation Chemical Catalysis program [CHE-1566348]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1566348] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1532225] Funding Source: National Science Foundation
Nickel (oxy)hydroxide-based (NiOxHy) 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)(2) nanosheets during electrochemistry measurements. Reconstruction of Ni(OH)(2) 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 NiOxHy-based supercapacitors and oxygen-evolution catalysts, illustrating the dynamic nature of Ni-based nanostructures under electrochemical conditions.
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