Włodzimierz Czepa

Włodzimierz Czepa
Adam Mickiewicz University | UAM · Department of Bioinorganic Chemistry

Master of Science

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14
Publications
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577
Citations

Publications

Publications (14)
Article
Full-text available
Tunable physicochemical properties combined with the high chemical and thermal stabilities of covalent organic frameworks (COFs) make them ideal candidates for the next generation of energy storage systems. The integration of redox-active moieties (e.g., thiols) in COFs imparts them a pseudocapacitive characteristic and represents an efficient stra...
Article
We report the synthesis of ultralong copper sulfide nanowires (Cu2−xSNWs) through the sulphidation reaction of metallic copper nanowires (CuNWs) by thiourea under mild conditions. The multiscale characterization of Cu2−xSNWs revealed the presence of a core shell structure made up of an external covellite layer coating a roxbyite core. The Cu2−xSNWs...
Article
Supercapacitor energy storage devices recently garnered considerable attention due to their cost-effectiveness, eco-friendly nature, high power density, moderate energy density and long-term cycle stability. Such figures of merit render supercapacitors unique energy sources to power portable electronic devices. Among various energy storage material...
Article
Full-text available
Membrane‐based processes, namely, water purification and harvesting of osmotic power deriving from the difference in salinity between seawater and freshwater are two strategic research fields holding great promise for overcoming critical global issues such as the world growing energy demand, climate change, and access to clean water. Ultrathin memb...
Article
Full-text available
The problem of pollution in the current world is growing, however people’s awareness of environmental protection and ecology is also increasing. The aim of the study is to present three new Schiff base compounds with Co(II/III) ions and to assess their photocatalytic activity. The study was supported by cyclic voltammetry technique. In due course t...
Article
In this study, we have developed a novel mesoporous SiO2 - graphene oxide hybrid material (SiO2NH2-GO) as highly efficient adsorbent for removal of cationic organic dyes from water. The fabrication of such a three-dimensional (3D) SiO2NH2-GO composite has been achieved via the condensation reaction between the amine units exposed on 3-aminopropyl-f...
Article
Towards the introduction of fast faradaic pseudocapacitive behavior and the increase of the specific capacitance of carbon-based electrodes, we have covalently functionalized graphene oxide with a redox active thiourea-formaldehyde polymer yield-ing a multifunctional hybrid system. The multiscale physical and chemical characterization of the novel...
Article
The development of novel materials for enhanced electrochemical energy storage applications, in particular for the fabrication of supercapacitors (SCs) displaying increased properties, is a milestone of both fundamental and technological relevance. Among nanostructured materials, polyoxometalates (POMs) combined with various carbon-based nanostruct...
Article
Herein, we present synthesis and characterization of new ligand with N2O‐donor moiety based on benzothiazole unit and its two complexes with Cu(II) cations. X‐ray diffraction measurements revealed solid state structures of presented compounds as mono‐ and dinuclear entities. Both complexes appeared to be highly effective catalysts in oxidation proc...
Article
During the last decade, two-dimensional materials (2DMs) have attracted great attention due to their unique chemical and physical properties, which make them appealing platforms for diverse applications in opto-electronic devices, energy generation and storage, and sensing. Among their various extraordinary properties, 2DMs possess high surface are...
Article
Highly porous foams based on graphene oxide functionalized with polyethylenimine are generated and used with unprecedented efficiency for adsorbing heavy metal ions. A multiscale analysis of the GO-BPEI nanocomposite provided evidence for the covalent grafting of BPEI on GO and the formation of low crystalline porous foams. The uptake experiments r...
Article
Herein, we present the efficient synthesis of two new supramolecular complexes according to reaction conditions. Mononuclear iron (III) and tetranuclear iron(II) complexes with a new N2O-donor Schiff base ligand HL which self-organises into thermally stable (up to 250 °C). The second one self-organises in non-covalent organic framework stabilised b...

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