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Non-covalent ligand-oxide interaction promotes oxygen evolution
Qianbao Wu, Junwu Liang, Mengjun Xiao, Chang Long, Lei Li, Zhenhua Zheng, Andraž Mavrič, Xia Zheng, Hai-Wei Liang, Hongfei Liu, Matjaž Valant, Wei Wang, Zhengxing Lv, Jiong Li, Chunhua Cui, 2023, original scientific article

Abstract: Strategies to generate high-valence metal species capable of oxidizing water often employ composition and coordination tuning of oxide-based catalysts, where strong covalent interactions with metal sites are crucial. However, it remains unexplored whether a relatively weak “non-bonding” interaction between ligands and oxides can mediate the electronic states of metal sites in oxides. Here we present an unusual non-covalent phenanthroline-CoO2 interaction that substantially elevates the population of Co4+ sites for improved water oxidation. We find that phenanthroline only coordinates with Co2+ forming soluble Co(phenanthroline)2(OH)2 complex in alkaline electrolytes, which can be deposited as amorphous CoOxHy film containing non-bonding phenanthroline upon oxidation of Co2+ to Co3+/4+. This in situ deposited catalyst demonstrates a low overpotential of 216 mV at 10 mA cm−2 and sustainable activity over 1600 h with Faradaic efficiency above 97%. Density functional theory calculations reveal that the presence of phenanthroline can stabilize CoO2 through the non-covalent interaction and generate polaron-like electronic states at the Co-Co center.
Keywords: water oxidation, cobalt hydroxide, ligand-metal interactions
Published: 23.02.2023; Views: 117; Downloads: 4
.pdf Fulltext (1,77 MB)

Copper Bioavailability and Leaching in Conventional and Organic Viticulture under Environmental Stress
Marco Contin, Elisa Pellegrini, Erika Jez, 2023, original scientific article

Abstract: The continuous use of Cu-based fungicides in viticulture has caused Cu accumulation in soils, which represents a major environmental and toxicological concern. The purpose of this study was to verify whether the organic management would be more resilient to temperature and moisture stresses in comparison to conventional practices. Two organic and two conventional vineyard soils, contrasting in pH, were exposed for six months to temperature stress (29 °C), moisture stress (10% water holding capacity—WHC), and combined stresses (29 °C—10% WHC). Main soil properties, Cu speciation, bioavailability, and leaching were monitored before and after 6 months’ incubation. Results confirm that the increase of temperature caused a decrease in both total organic carbon (TOC) and dissolved organic carbon (DOC) (up to 19% and 49%, respectively), a decrease in available ammonium, and an increase in nitrate. Moisture stress tends to mitigate some of these changes. Despite that, changes of Cu bioavailability and leaching were limited and rarely significant. Moreover, no regular trends between conventional and organic management could be observed. Changes in soil pH and total N (TN) appeared as the most influencing properties to regulate Cu behavior in vineyard soils. Calcareous soils were more resistant to environmental stresses compared to acid soils, regardless of the type of management (conventional or organic).
Keywords: soil copper, climate changes, soil organic matter, organic viticulture, BCR speciation
Published: 22.02.2023; Views: 126; Downloads: 6
.pdf Fulltext (2,57 MB)

Dušikovi oksidi
Tina Škorjanc, 2023, popular article

Keywords: dušikov oksid, didušikov oksid, dušikov monoksid, smejalni plin, onesnaženje zraka
Published: 21.02.2023; Views: 98; Downloads: 0
.pdf Fulltext (4,46 MB)

Jeong Gi Kang, Hashem Bordbar, 2025, original scientific article

Abstract: Abstract. The subalgebra of BCK/BCI-algebra using Łukasiewicz anti fuzzy set introduced by Jun is studied in this article. The concept of Łukasiewicz anti fuzzy subalgebra of a BCK/BCI-algebra is introduced, and several properties are investigated. The relationship between anti fuzzy subalgebra and Łukasiewicz anti fuzzy subalgebra is given, and the characterization of a Łukasiewicz anti fuzzy subalgebra is discussed. Conditions are found in which a Lukasiewicz anti fuzzy set is a Lukasiewicz anti fuzzy subalgebra Finally, conditions under which ⋖-subset, Υ- subset, and anti-subset become subalgebra are explored.
Keywords: Anti fuzzy subalgebra, Łukasiewicz anti fuzzy set, Łukasiewicz anti fuzzy subalgebra, ⋖-subset, Υ-subset, anti subset
Published: 20.02.2023; Views: 108; Downloads: 0
.pdf Fulltext (406,83 KB)

Simultaneous determination of chemical parameters for wine and cider quality control using HPLC-UV/RI system based on reverse-phase separation capabilities
Mitja Martelanc, 2022, published scientific conference contribution abstract (invited lecture)

Keywords: HPLC-UV-RI, Cider, Wine, Must, Organic aacids, Ethanol, Glucose, Fructose.
Published: 20.02.2023; Views: 82; Downloads: 0
.pdf Fulltext (16,55 MB)

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