Effect of sodium doping in NiO/Vermiculite composite on photocatalytic hydrogen production from methanol-water decomposition

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F25%3A10257765" target="_blank" >RIV/61989100:27710/25:10257765 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S2666523925000534?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2666523925000534?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apsadv.2025.100745" target="_blank" >10.1016/j.apsadv.2025.100745</a>

Result language

angličtina

Original language name

Effect of sodium doping in NiO/Vermiculite composite on photocatalytic hydrogen production from methanol-water decomposition

Original language description

This study investigates the efficiency of sodium-doped NiO/vermiculite (Vm) composites as photocatalysts for hydrogen production via methanol-water decomposition under UV irradiation. Using natural vermiculite as a support, NiO was introduced as a p-type semiconductor, and sodium doping was achieved using sodium hydroxide (NaOH) or sodium nitrate (NaNO3). Three synthesis methods - dry synthesis by milling, capillary impregnation, and wet impregnation were investigated for their influence on the structural, textural, optical, and electrical properties and the photocatalytic activity. Characterization techniques, including X-ray fluorescence, X-ray diffraction, atomic absorption spectrometry, photoluminescence, scanning electron microscopy with energy dispersive X-ray spectroscopy confirmed successful incorporation of NiO and sodium into the vermiculite matrix. Photocatalytic tests demonstrated that sodium doping enhances the stability and activity of the photocatalysts by reducing electron-hole recombination rates, with NaOH proving to be a more effective sodium source than NaNO3. Among the samples, those synthesized via capillary impregnation (NiO(OH)/Vm-C) and dry synthesis (NiO(OH)/Vm-M) showed the highest hydrogen yields (550 and 540 μmol/g cat., respectively) due to optimal crystallite size (∼22–23 nm) and defect-induced charge transfer efficiency. This is the first study to systematically investigate the role of sodium doping in NiO/clay-based photocatalysts and to reveal clear structure–property–activity correlations based on synthesis method and dopant type. The findings highlight the potential of Na-doped NiO/Vm composites as cost-effective and scalable photocatalysts for hydrogen production. The insights gained here lay the foundation for further development of layered, clay-supported photocatalysts beyond conventional oxide systems. © 2025 The Authors

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20402 - Chemical process engineering

Project

—

Continuities

—

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Applied Surface Science Advances

ISSN

2666-5239

e-ISSN

2666-5239

Volume of the periodical

27

Issue of the periodical within the volume

June

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

11

Pages from-to

100745

UT code for WoS article

001470253000001

EID of the result in the Scopus database

2-s2.0-105002004461