期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 8, 页码 7294-7305出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c00483
关键词
nickel hydroxide nanoparticles; nickel hydroxide-oxyhydroxide interconversions; core-shell-skin structure; stability of nanoparticles; nickel-metal hydride batteries; miniaturized electrochemical energy storage
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Frontiers Program [RGPNM 477963-2015]
- Queen's University
We report results on the synthesis of unsupported and carbon-supported nickel hydroxide nanoparticles (beta-Ni(OH)(2) NPs). Their characterization using X-ray diffraction (XRD) and transmission electron microscopy' (TEM) reveals that the crystallite size is 2.2 nm and the particle size is 2.6 nm with a narrow size distribution. Thermogravimetric analysis (TGA) of the carbon-supported beta-Ni(OH)(2) NPs shows that the metal loading is ca. 27% wt. Cyclic voltammetry (CV) examination in 0.10 M aqueous NaOH demonstrates that the interconversions degree of beta-Ni(OH)(2) reversible arrow beta-NiO(OH) is ca. 61%, much more than that in the case of analogous bulk materials. The process is also monitored using confocal Raman spectroscopy, which reveals that the beta-Ni(OH)(2) reversible arrow beta-NiO(OH) interconversions occur in the interfacial region. Density functional theory (DFT) calculations point to the existence of NiO in the core of the nanoparticles, in agreement with the XRD data. CV, DFT, and Raman spectroscopy measurements demonstrate that the beta-Ni(OH)(2) reversible arrow beta-NiO(OH) interconversions occur only in the surface layer of the nanoparticles. Repetitive potential cycling of the beta-Ni(OH)(2) NPs in 0.10 M aqueous NaOH in the 0.05 V <= E <= 1.65 V range shows that they possess remarkable stability, thus making them suitable for application in miniaturized electrochemical energy storage.
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