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Free-standing TiO2 nanotubes decorated with spherical nickel nanoparticles as a cost-efficient electrocatalyst for oxygen evolution reaction
Abstract
Here, we report significant activity towards the oxygen evolution reaction (OER) of spherical nickel nanoparticles (NPs) electrodeposited onto free-standing TiO2 nanotubes (TNT) via cyclic voltammetry. It has been shown that simple manipulation of processing parameters, including scan rate and number of cycles, allows for formation of the NPs in various diameters and amounts. The polarization data with respect to transmission electron microscopy (TEM) allowed for determination of the diameter and propagation depth of the Ni NPs leading to the highest activity towards the OER with an overpotential of 540 mV at +10 mA cm−2 and Tafel slope of 52 mV per decade. X-ray photoelectron spectroscopy (XPS) indicates the presence of structure defects within Ni NPs whereas Mott–Schottky analysis provides information on the anodically shifted flat band potential and highly increased donor density. The obtained results along with literature studies allowed a proposal of the origin of the enhancement towards the OER. We believe that combination of transition metal-based NPs and TNT provides valuable insight on efficient and low-cost electrocatalysts.
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Authors (6)
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Katarzyna Grochowska
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Jakub Rysz
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Siuzdak Katarzyna dr hab. inż
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1039/D0RA07563A
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Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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RSC Advances
no. 11,
pages 219 - 228,
ISSN: 2046-2069 - Language:
- English
- Publication year:
- 2021
- Bibliographic description:
- Haryński Ł., Grochowska K., Karczewski J., Ryl J., Rysz J., Katarzyna S.: Free-standing TiO2 nanotubes decorated with spherical nickel nanoparticles as a cost-efficient electrocatalyst for oxygen evolution reaction// RSC Advances -Vol. 11,iss. 1 (2021), s.219-228
- DOI:
- Digital Object Identifier (open in new tab) 10.1039/d0ra07563a
- Verified by:
- Gdańsk University of Technology
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