Improving Ni(OH)2 electrocatalysis with graphene quantum dots
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F26%3A0200773" target="_blank" >RIV/00216305:26620/26:0200773 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0360319925058768?getft_integrator=clarivate&pes=vor&utm_source=clarivate" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0360319925058768?getft_integrator=clarivate&pes=vor&utm_source=clarivate</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ijhydene.2025.152873" target="_blank" >10.1016/j.ijhydene.2025.152873</a>
Alternative languages
Result language
angličtina
Original language name
Improving Ni(OH)2 electrocatalysis with graphene quantum dots
Original language description
Water splitting is a critical process for sustainable energy transition, involving the electrolysis of water into its constituent elements, hydrogen and oxygen. In this study, we demonstrate the superior electrocatalytic activity of graphene quantum dots (GQDs)-decorated nickel hydroxide (Ni(OH)2) nanostructures for the oxygen evolution reaction (OER) in alkaline media. Ni(OH)2 nanowalls are synthesized on graphene paper substrates by chemical bath deposition (CBD) and uniformly decorated with GQDs. Precise optimization of the GQDs amount indicates that a low number of GQDs offers limited improvement of the OER, while a high number is unfavorable due to the minor exposed surface of the electrocatalyst. Instead, an intermediate quantity of GQDs significantly enhances the OER performance metrics, leading to a low overpotential at 10 mA cm-2 current density ((10) of 308 mV and a Tafel slope of 53 mV dec-1, rapid electron transfer, high turnover frequency (TOF) of 5.5 x 10-2 s-1 at 350 mV overpotential, large electrochemically active surface area (ESCA) of 145 cm2, good durability, and good cycling stability in 1 M KOH electrolyte (pH 14). Mott-Schottky analysis sheds light on the OER mechanism, revealing the role of GQDs in increasing the surface hole density of Ni(OH)2, thereby boosting the OER efficiency.
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
21000 - Nano-technology
Result continuities
Project
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Continuities
O - Projekt operacniho programu
Others
Publication year
2026
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International journal of hydrogen energy
ISSN
0360-3199
e-ISSN
1879-3487
Volume of the periodical
199
Issue of the periodical within the volume
Leden
Country of publishing house
GB - UNITED KINGDOM
Number of pages
14
Pages from-to
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UT code for WoS article
001637189500001
EID of the result in the Scopus database
2-s2.0-105023829608