Activation of Osmium by the Surface Effects of Hydrogenated TiO2 Nanotube Arrays for Enhanced Hydrogen Evolution Reaction Performance
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15640%2F23%3A73621801" target="_blank" >RIV/61989592:15640/23:73621801 - isvavai.cz</a>
Result on the web
<a href="https://pubs.acs.org/doi/10.1021/acsami.3c04498" target="_blank" >https://pubs.acs.org/doi/10.1021/acsami.3c04498</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acsami.3c04498" target="_blank" >10.1021/acsami.3c04498</a>
Alternative languages
Result language
angličtina
Original language name
Activation of Osmium by the Surface Effects of Hydrogenated TiO2 Nanotube Arrays for Enhanced Hydrogen Evolution Reaction Performance
Original language description
Efficientcathodes for the hydrogen evolution reaction (HER) inacidic water electrolysis rely on the use of expensive platinum groupmetals (PGMs). However, to achieve economically viable operation,both the content of PGMs must be reduced and their intrinsically strongH adsorption mitigated. Herein, we show that the surface effects ofhydrogenated TiO2 nanotube (TNT) arrays can make osmium,a so far less-explored PGM, a highly active HER electrocatalyst. Thesedefect-rich TiO2 nanostructures provide an interactivescaffold for the galvanic deposition of Os particles with modulatedadsorption properties. Through systematic investigations, we identifythe synthesis conditions (OsCl3 concentration/temperature/reactiontime) that yield a progressive improvement in Os deposition rate andmass loading, thereby decreasing the HER overpotential. At the sametime, the Os particles deposited by this procedure remain mainly sub-nanometricand entirely cover the inner tube walls. An optimally balanced Os@TNTcomposite prepared at 3 mM/55 & DEG;C/30 min exhibits a record lowoverpotential (& eta;) of 61 mV at a current density of 100 mA cm(-2), a high mass activity of 20.8 A mg(Os) (-1) at 80 mV, and a stable performance in an acidic medium.Density functional theory calculations indicate the existence of stronginteractions between the hydrogenated TiO2 surface andsmall Os clusters, which may weaken the Os-H* binding strengthand thus boost the intrinsic HER activity of Os centers. The resultspresented in this study offer new directions for the fabrication ofcost-effective PGM-based catalysts and a better understanding of thesynergistic electronic interactions at the PGM|TiO2 interface.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
21002 - Nano-processes (applications on nano-scale); (biomaterials to be 2.9)
Result continuities
Project
<a href="/en/project/EF15_003%2F0000416" target="_blank" >EF15_003/0000416: Advanced Hybrid Nanostructures for Renewable Energy Applications</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
ACS Applied Materials & Interfaces
ISSN
1944-8244
e-ISSN
1944-8252
Volume of the periodical
15
Issue of the periodical within the volume
26
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
"31459 "- 31469
UT code for WoS article
001016772600001
EID of the result in the Scopus database
2-s2.0-85164244774