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Wyświetlanie 1-10 z 13
Tytuł:
Diffusion and surface charge studies of waste cow dung derived highly porous carbon as a facile electrode for solid-state supercapacitors
Autorzy:
Hołdyński, Marcin
Dubey, Prashant
Nogala, Wojciech
Shrivastav, Vishal
Sundriyal, Shashank
Gupta, Bhavana
Wydawca:
Elsevier
Cytata wydawnicza:
Diamond & Related Materials 130 (2022) 109529. https://doi.org/10.1016/j.diamond.2022.109529
Opis:
Carbon-based materials generated from biowaste have recently attracted interest due to their exceptional surface and conductive properties. Cow dung derived porous carbon (CDPC) with a 3D structure and linked pores is synthesized in this study, making it an alternative electrode for supercapacitors (SC). Herein, we studied the diffusion and surface charge contribution and their relationship with the scan rate. Diffusion charge contribution is more prevalent at lower scan rates. Furthermore, a large fraction of surface charge contribution of 69.2 % at a high scan rate of 100 mV/s indicates rapid electrochemical kinetics and hence high-rate performance even at higher current densities. In addition, utilizing a 1 M H2SO4 electrolyte, the CDPC electrode has attained a high specific capacitance value of 210 F/g at 0.5 A/g. Furthermore, symmetrical solid-state SC device displayed high energy density of 36 Wh/kg at good power density of 800 W/kg along with remarkable cyclic stability of 92.6 % after 10,000 charge-discharge cycles. Hence, these findings demonstrate that investigating surface and diffusion charge contributions opens up new avenues for tuning the supercapacitor performance.
European Union, Ministry of Science and Higher Education
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
Evaluation of local oxygen flux produced by photoelectrochemical hydroxide oxidation by scanning electrochemical microscopy
Autorzy:
Shrivastav, Vishal
Nogala, Wojciech
Sundriyal, Shashank
Aziz, Ariba
Holdynski, Marcin
Melvin, Ambrose A.
Gupta, Bhavana
Wydawca:
Springer Nature Limited
Cytata wydawnicza:
Gupta, B., Aziz, A., Sundriyal, S. et al. Evaluation of local oxygen flux produced by photoelectrochemical hydroxide oxidation by scanning electrochemical microscopy. Sci Rep 13, 5019 (2023). https://doi.org/10.1038/s41598-023-32210-6
Opis:
Several in-situ electrochemical approaches have been developed for performing a localized photoelectrochemical investigation of the photoanode. One of the techniques is scanning electrochemical microscopy (SECM), which probes local heterogeneous reaction kinetics and fluxes of generated species. In traditional SECM analysis of photocatalysts, evaluation of the influence of radiation on the rate of studied reaction requires an additional dark background experiment. Here, using SECM and an inverted optical microscope, we demonstrate the determination of O2 flux caused by light-driven photoelectrocatalytic water splitting. Photocatalytic signal and dark background are recorded in a single SECM image. We used an indium tin oxide electrode modified with hematite (α-Fe2O3) by electrodeposition as a model sample. The light-driven flux of oxygen is calculated by analysis of SECM image recorded in substrate generation/tip collection mode. In photoelectrochemistry, the qualitative and quantitative knowledge of oxygen evolution will open new doors for understanding the local effects of dopants and hole scavengers in a straightforward and conventional manner.
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
$Ag/ZrO_2$-NT/Zr hybrid material : a new platform for SERS measurements
Autorzy:
Sulka, Grzegorz
Pisarek, Marcin
Hnida, Katarzyna
Janik-Czachor, Maria
Kudelski, Andrzej
Rogulska, Agata
Hołdyński, Marcin
Opis:
In this paper, we present recent results of our attempts to produce nanoporous zirconia, as well as our investigations of a hybrid material consisting of nanoporous zirconia loaded with Ag-nanoparticles, Ag- n/ZrO 2 -NT/Zr, which could be used as an active SERS substrate. The Zr-based hybrid material, as our investigations have shown, is an active and stable substrate in SERS investigations aimed at detecting various organic molecules: mercaptobenzoic acid, pyridine and two different dyes – rodhanine deriva- tives. The SERS spectra for the probe molecules adsorbed on silver nanoparticles on a ZrO 2 -NT/Zr platform display characteristic intensity ratios different from those measured on previously studied nanoporous substrates based on Ti and Al, which ensure a different (alternative) interaction between the investi- gated adsorbate and adsorbent. In order to characterize our new substrate we used high-resolution SEM and surface analytical techniques: XPS (X-ray photoelectron spectroscopy) and SERS (surface enhanced Raman spectroscopy).
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Ammonium nanochelators in conjunction with arginine‑specific enzymes in amperometric biosensors for arginine assay
Autorzy:
Nogala, Wojciech
Sibirny, Andriy
Holdynski, Marcin
Gonchar, Mykhailo
Stasyuk, Nataliya
Demkiv, Olha
Gayda, Galina
Fayura, Lyubov
Współwytwórcy:
Nogala, Wojciech
Wydawca:
Springer Nature
Cytata wydawnicza:
Stasyuk, N., Gayda, G., Nogala, W. et al. Ammonium nanochelators in conjunction with arginine-specific enzymes in amperometric biosensors for arginine assay. Microchim Acta 191, 47 (2024). https://doi.org/10.1007/s00604-023-06114-1
Opis:
IIE‐Scholar Rescue Fund, Institute of International Education National Research Foundation of Ukraine (projects Nos. 2020.02/0100 and 2021.01/0010) “Presidential Discretionary-Ukraine Support Grants” from Simons Foundation (Award No 1030281) National Science Centre, Poland (Grant 2022/46/E/ST4/00457)
Amino acid L-arginine (Arg), usually presented in food products and biological liquids, can serve both as a useful indicator of food quality and an important biomarker in medicine. The biosensors based on Arg-selective enzymes are the most promising devices for Arg assay. In this research, three types of amperometric biosensors have been fabricated. They exploit arginine oxidase (ArgO), recombinant arginase I (ARG)/urease, and arginine deiminase (ADI) coupled with the ammonium-chelating redox-active nanoparticles. Cadmium-copper nanoparticles (nCdCu) as the most effective nanochelators were used for the development of ammonium chemosensors and enzyme-coupled Arg biosensors. The fabricated enzyme/nCdCu-containing bioelectrodes show wide linear ranges (up to 200 µM), satisfactory storage stabilities (14 days), and high sensitivities (A⋅M−1⋅m−2) to Arg: 1650, 1700, and 4500 for ADI-, ArgO- and ARG/urease-based sensors, respectively. All biosensors have been exploited to estimate Arg content in commercial juices. The obtained data correlate well with the values obtained by the reference method. A hypothetic scheme for mechanism of action of ammonium nanochelators in electron transfer reaction on the arginine-sensing electrodes has been proposed.
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
Surface modification of nanoporous alumina layers by deposition of Ag nanoparticles : effect of alumina pore diameter on the morphology of silver deposit and its influence on SERS activity
Autorzy:
Sulka, Grzegorz
Pisarek, Marcin
Nowakowski, Robert
Janik-Czachor, Maria
Kudelski, Andrzej
Kurowska-Tabor, Elżbieta
Rogulska, Agata
Holdyński, Marcin
Opis:
Self-organized Al2O3 nanoporous/nanotubular (Al2O3-NP) oxide layers decorated with silver nanoparticles (Ag-NPs) exhibiting specific properties may serve as attractive SERS substrates for investigating the interactions between an adsorbate and adsorbent, or as stable platforms for detecting various organic compounds. This article presents the influence of the size of the alumina nanopores with a deposit of silver nanoparticles obtained by the magnetron sputtering technique on the morphology of silver film. Moreover, the effect of pore diameter on the intensity of SERS spectra in Ag-NPs/Al2O3-NP/Al composites has also been estimated. For such investigations we used pyridine as a probe molecule, since it has a large cross-section for Raman scattering. To characterize the morphology of the composite oxide layer Ag-NPs/Al2O3-NP/Al, before and after deposition of Ag-NPs by PVD methods (Physical Vapor Deposition), we used scanning electron microscopy (SEM) and atomic force microscopy (AFM). The surface analytical technique of surface-enhanced Raman spectroscopy (SERS) was used to investigate the surface activity of the composite. The results obtained show that, for a carefully controlled amount of Ag (0.020 mg/cm2 - deposited on the top of alumina nanopores whose average size varies from ∼86 nm up to ∼320 nm) in the composites investigated, pore size significantly affects SERS enhancement. We obtained distinctly higher intensities of SERS spectra for substrates with an Ag-NPs deposit having a larger diameter of the alumina nanopores. AFM results suggest that both the lateral and perpendicular distribution of Ag-NPs within and on the top of the largest pores is responsible for the highest SERS activity of the resulting Ag-NPs/Al2O3-NP/Al composite layer, since it produces a variety of cavities and slits which function as resonators for the adsorbed molecules. The Ag-NPs/MeOx-NP/Me composite layers obtained ensure a good reproducibility of the SERS measurements.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Artificial nitrate reductase-based electrodes: A dual-function approach for self-powered explosive-selective sensors and biofuel cells
Autorzy:
Szala, Mateusz
Gawinkowski, Sylwester
Kula, Przemysław
Nogala, Wojciech
Holdynski, Marcin
Gonchar, Mykhailo
Brzezinski, Mateusz
Stasyuk, Nataliya
Demkiv, Olha
Wydawca:
Elsevier
Cytata wydawnicza:
Chemical Engineering Journal 523 (2025) 168560
Opis:
MSCA4Ukraine Consortium (ID number 1186421), National Science Centre, Poland (Grants 2022/46/E/ST4/00457, 2023/50/E/ST4/00600), Polish high-performance computing infrastructure PLGrid (HPC Centers: ACK Cyfronet AGH, WCSS, CI TASK) within computational grant no. PLG/2024/016936.
Miniaturized devices powered by fuel cells for the detection of explosives would play an important role in enhancing safety and security in military operations, improving public safety measures, facilitating environ­mental cleanup in contaminated areas, and supporting humanitarian efforts in post-conflict regions. Amperometric sensors based on artificial enzymes are efficient and cost-effective tools for a variety of analytical applications. In the current study, bio(chemo)sensors based on highly selective artificial nitrate reductases or natural nitrate reductase for detecting 2,4,6-trinitrotoluene (TNT) and 1,3,5-trinitro-1,3,5-triazinane (hexogen, RDX) in post-explosive soil samples, as well as related biofuel cells (BFCs), have been developed. The fabricated amperometric bio(chemo)sensors based on cadmium‑cobalt nanocomposites and copper nanostructures possess high sensitivity (6330 A⋅M− 1⋅m− 2 and 6070 A⋅M− 1⋅m− 2), low limit of detection and good selectivity towards the target analytes, TNT and RDX. The developed best BFC generates an open circuit potential of 560 mV with a maximum power density of 0.850 μW⋅cm− 2 at an optimum of 0.1 mM RDX. The constructed biofuel cells were tested for model bioremediation on the real samples of the post-explosive soils.
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
Copper foam supported g‑C3N4‑metal–organic framework bacteria biohybrid cathode catalyst for CO2 reduction in microbial electrosynthesis
Autorzy:
Shrivastav, Vishal
Nogala, Wojciech
Min, Booki
Mansi
Sundriyal, Shashank
Tiwari, Umesh K.
Holdynski, Marcin
Noori, Md Tabish
Giri, Balendu Sekhar
Gupta, Bhavana
Wydawca:
Springer Science and Business Media LLC
Cytata wydawnicza:
Noori, M.T., Mansi, Sundriyal, S. et al. Copper foam supported g-C3N4-metal–organic framework bacteria biohybrid cathode catalyst for CO2 reduction in microbial electrosynthesis. Sci Rep 13, 22741 (2023). https://doi.org/10.1038/s41598-023-49246-3 https://doi.org/10.1038/s41598-023-49246-3
Opis:
Microbial electrosynthesis (MES) presents a versatile approach for efficiently converting carbon dioxide (CO2) into valuable products. However, poor electron uptake by the microorganisms from the cathode severely limits the performance of MES. In this study, a graphitic carbon nitride (g-C3N4)-metal–organic framework (MOF) i.e. HKUST-1 composite was newly designed and synthesized as the cathode catalyst for MES operations. The physiochemical analysis such as X-ray diffraction, scanning electron microscopy (SEM), and X-ray fluorescence spectroscopy showed the successful synthesis of g-C3N4-HKUST-1, whereas electrochemical assessments revealed its enhanced kinetics for redox reactions. The g-C3N4-HKUST-1 composite displayed excellent biocompatibility to develop electroactive biohybrid catalyst for CO2 reduction. The MES with g-C3N4-HKUST-1 biohybrid demonstrated an excellent current uptake of 1.7 mA/cm2, which was noted higher as compared to the MES using g-C3N4 biohybrid (1.1 mA/cm2). Both the MESs could convert CO2 into acetic and isobutyric acid with a significantly higher yield of 0.46 g/L.d and 0.14 g/L.d respectively in MES with g-C3N4-HKUST-1 biohybrid and 0.27 g/L.d and 0.06 g/L.d, respectively in MES with g-C3N4 biohybrid. The findings of this study suggest that g-C3N4-HKUST-1 is a highly efficient catalytic material for biocathodes in MESs to significantly enhance the CO2 conversion.
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Wyświetlanie 1-10 z 13

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