@article{2-s2.0-85168415347,

title = {Ex-situ versus in-situ synthesis of NZFO/f-MWCNTs nanocomposites},

author = { A. Bajorek and B. Szostak and M. Dulski and J.M. Greneche and J. Kubacki and S. Lewińska and B. Liszka and M. Pawlyta and A. Ślawska-Waniewska and M. Szczepanik and E. Partyka-Jankowska and T. Sobol},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85168415347&doi=10.1016%2fj.jmmm.2023.171150&partnerID=40&md5=6a45802c2d273afff9c650d6f470b885},

doi = {10.1016/j.jmmm.2023.171150},

issn = {03048853},

year  = {2023},

date = {2023-01-01},

journal = {Journal of Magnetism and Magnetic Materials},

volume = {585},

publisher = {Elsevier B.V.},

abstract = {The comparison between NZFO/f-MWCNTs composites based on Ni0.5Zn0.5Fe2O4 (NFZO) nanoparticles with 5 wt% and functionalized multi-walled carbon nanotubes (f-MWCNTs) synthesized via ex-situ and in-situ method is discussed. The significant difference in the NZFO average crystallite size between both nanohybrids is unveiled. The slight redistribution of cations over tetrahedral and octahedral sites versus the synthesis route is confirmed by the variant inversion factor in Raman spectroscopy. The dominant role of the f-MWCNTs matrix was exposed by electronic structure analysis. The photoemission and absorption spectra confirm the formation of NZFO/f-MWCNTs composites. The redistribution of iron cations versus synthesis type is revealed by studying Fe2p and Fe L-edge spectra. The cluster-glass magnetic state of NZFO interacting nanoparticles with different sizes for ex-situ and in-situ hybrids is demonstrated by the magnetic properties analysis. The core–shell-like structure with a magnetic core and disordered dead layer is evidenced. The influence of Fe-based carbon residues was revealed as more dominant for in-situ synthesized composite. © 2023 Elsevier B.V.},

note = {1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85141914183,

title = {Influence of carbon support structure on cathode catalysts durability},

author = { M. Pawlyta and S. Smykała and B. Liszka and A. Blacha-Grzechnik and M. Krzywiecki and K. Jurkiewicz and A. Jakóbik-Kolon},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85141914183&doi=10.1016%2fj.apsusc.2022.155637&partnerID=40&md5=3e46cbe5fc42c253219533db0328b3ea},

doi = {10.1016/j.apsusc.2022.155637},

issn = {01694332},

year  = {2023},

date = {2023-01-01},

journal = {Applied Surface Science},

volume = {611},

publisher = {Elsevier B.V.},

abstract = {The most important barrier of the common fuel cells application is the lack of effective and durable electrocatalysis for the oxygen reduction reaction. This article presents the results obtained for platinum nanoparticles deposited on carbon black with structure modified by heat treatment at high temperatures (up to 3000 °C). The TEM, XRD, Raman, EELS and XPS spectroscopy was used to evaluate how the change in the support structure affects the structure of the deposited catalytic particles and the durability of the produced catalytic system. The influence of the changes of the carbon support structure caused by annealing temperature on the durability of the Pt/CB system is complex. Initially, for medium temperatures, heating removes amorphous carbon and ionic impurities, reduces microporosity, increases graphitization, and sp2 carbon atom content. The main impact is exerted by the reduction of the concentration of functional groups and structure defects, as these changes lead to deterioration of nanoparticle dispersion and stability. For higher temperatures further increase in graphitization enables the formation of a strong interaction between Pt and C and sufficiently increases the corrosion resistance of the support, which altogether leads to an improvement in the durability of the entire system. © 2022},

note = {4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85124009480,

title = {A Comprehensive Study of Pristine and Calcined f-MWCNTs Functionalized by Nitrogen-Containing Functional Groups},

author = { A. Bajorek and B. Szostak and M. Dulski and J.M. Greneche and S. Lewińska and B. Liszka and M. Pawlyta and A. Ślawska-Waniewska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85124009480&doi=10.3390%2fma15030977&partnerID=40&md5=e99235f13dc08c8e7e64a44592ba08de},

doi = {10.3390/ma15030977},

issn = {19961944},

year  = {2022},

date = {2022-01-01},

journal = {Materials},

volume = {15},

number = {3},

publisher = {MDPI},

abstract = {We present the study of pristine and calcined f-MWCNTs functionalized by nitrogen-containing functional groups. We focus on the structural and microstructural modification tuned by the previous annealing. However, our primary goal was to analyze the electronic structure and magnetic properties in relation to the structural properties using a multi-technique approach. The studies carried out by X-ray diffraction, XPS, and57Fe Mössbauer spectrometry revealed the presence of γ-Fe nanoparticles, Fe3C, and α-FeOOH as catalyst residues. XPS analysis based on the deconvolution of core level lines confirmed the presence of various nitrogen-based functional groups due to the purification and functionalization process of the nanotubes. The annealing procedure leads to a structural modification mainly associated with removing surface impurities as purification residues. Magnetic studies confirmed a significant contribution of Fe3C as evidenced by a Curie temperature estimated at TC = 452 ± 15 K. A slight change in magnetic properties upon annealing was revealed. The detailed studies performed on nanotubes are extremely important for the further synthesis of composite materials based on f-MWCNTs. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.},

note = {6},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85142602503,

title = {Transmission Electron Microscopy Observation of the Fuel Cell Catalyst Degradation during the Oxygen Reduction Reaction},

author = { M. Pawlyta and S. Smykała and B. Liszka and A. Blacha-Grzechnik},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85142602503&doi=10.4028%2fp-975920&partnerID=40&md5=a51ae0fe18469dd3da02dbce58fe5268},

doi = {10.4028/p-975920},

issn = {10120386},

year  = {2022},

date = {2022-01-01},

journal = {Defect and Diffusion Forum},

volume = {420},

pages = {91-100},

publisher = {Trans Tech Publications Ltd},

abstract = {Increasing durability of catalysts used in fuel cells is a necessary condition for their widespread commercialization. Fulfilling this condition requires understanding the catalyst degradation mechanism to propose how to reduce it. Transmission electron microscopy can help solve this problem thanks to the fact that it enables direct observation and thus unambiguous interpretation of the processes taking place. For this purpose, Identical Location Transmission Electron Microscopy (IL-TEM) was applied for observations of a commercial catalyst (platinum nanoparticles with a diameter of about 2 nm deposited on Vulcan carbon black) before and after durability tests. Obtained results may contribute to the development of better models of phenomena occurring during cell operation. © 2022 Trans Tech Publications Ltd, Switzerland.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85079877941,

title = {Microstructure and magnetism of Ni0.5Zn0.5Fe2O4/MWCNTs nanocomposites},

author = { A. Bajorek and B. Liszka and B. Szostak and M. Pawlyta},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85079877941&doi=10.1016%2fj.jmmm.2020.166634&partnerID=40&md5=854d325b25bf6c98b04c14bbb54e7212},

doi = {10.1016/j.jmmm.2020.166634},

issn = {03048853},

year  = {2020},

date = {2020-01-01},

journal = {Journal of Magnetism and Magnetic Materials},

volume = {503},

publisher = {Elsevier B.V.},

abstract = {The multitechnique characterization of magnetic nanocomposites NZFO/f-MWCNTs synthesized via co-precipitation method based on Ni0.5Zn0.5Fe2O4 ferrite nanoparticles (NFZO) and functionalized multiwalled carbon nanotubes (f-MWCNTs) is reported. The XRD patterns and TEM images confirm the successful formation of composites after synthesis. The crystallites size of NZFO particles in almost non-dependent on treatment route in contrary to microstructure of as-synthesized hybrids. The comparison of XPS spectra of studied nanomaterials reveals the domination of MWCNTs contribution as expected. The iron redistribution/separation confirmed by variation within deconvoluted Fe2p spectra is dependent on calcination process. The magnetic properties in composites is slightly affected by catalyst residuals but the occurrence of superparamagnetic (SPM) state originated from NZFO is sustained. © 2020 Elsevier B.V.},

note = {10},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85066425655,

title = {Porous polyurethane materials for medical applications [Porowate materiały poliuretanowe do zastosowań w diagnostyce medycznej]},

author = { A.S. Swinarew and M. Muskus and J. Gabor and J. Paluch and M. Popczyk and B. Swinarew and A. Stanula and K.K. Kubik and H. Okła and B. Liszka},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066425655&doi=10.15199%2f62.2019.2.13&partnerID=40&md5=d18020899e57ad8f55961620e2846576},

doi = {10.15199/62.2019.2.13},

issn = {00332496},

year  = {2019},

date = {2019-01-01},

journal = {Przemysl Chemiczny},

volume = {98},

number = {2},

pages = {251-256},

publisher = {Wydawnictwo SIGMA-NOT},

abstract = {Polyurethane (PUR) foams were synthetized from polyols and methylene diphenyl diisocyanate polymers at mass ratios 1:1, 1:3 and 3:1 without any catalyst or in its presence. The porous structure of the PUR foams was detd. by using scanning electron microscopy and high-resolution 3D computed tomog. The PUR foams showed a good sorbability and could be used in the human diagnostic (respira-tory phase). © 2019, Wydawnictwo SIGMA-NOT. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85017142677,

title = {The impact of synthesis method of CNT supported CeZrO2 and Ni-CeZrO2 on catalytic activity in WGS reaction},

author = { A. Łamacz and K. Matus and B. Liszka and J. Silvestre-Albero and M. Lafjah and T. Dintzer and I. Janowska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85017142677&doi=10.1016%2fj.cattod.2017.03.035&partnerID=40&md5=f759263a2bb386999ddd72b6e1c072e3},

doi = {10.1016/j.cattod.2017.03.035},

issn = {09205861},

year  = {2018},

date = {2018-01-01},

journal = {Catalysis Today},

volume = {301},

pages = {172-182},

publisher = {Elsevier B.V.},

abstract = {Carbon nanotube (CNT) supported catalysts containing ceria-zirconia mixed oxide (CeZrO2) and nickel were synthesized and tested in water gas shift (WGS) reaction. Physicochemical characterization including N2 adsorption, X-ray diffraction (XRD), scanning and transmission microscopy (SEM/TEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA) and temperature programmed reduction with H2 (H2-TPR), as well as catalytic tests of WGS reaction showed that the synthesis method had significant impact on composition, morphology, structural properties and catalytic performance of obtained hybrid materials. The catalysts obtained by co-precipitation of metal oxides (NiO and/or CeZrO2) on CNT walls demonstrated better dispersion of active phase and smaller particle size than catalyst obtained by depositing of powder CeZrO2 or Ni-CeZrO2. Moreover, the catalyst obtained by co-precipitation revealed better performance in WGS reaction; however, some CH4 formation was noticed over Ni-CeZrO2/CNT system. The role of CeZrO2 in catalysts performance in WGS as well as the importance of good metal-oxide contact were confirmed. © 2017 Elsevier B.V.},

note = {19},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85047899447,

title = {Estimation of the chemical specific surface area of catalytic nanoparticles by TEM images analysis},

author = { M. Pawlyta and B. Soble and B. Liszka},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85047899447&doi=10.5604%2f01.3001.0012.0733&partnerID=40&md5=a635f4323871551d1c9f2345f26b0549},

doi = {10.5604/01.3001.0012.0733},

issn = {17348412},

year  = {2018},

date = {2018-01-01},

journal = {Journal of Achievements in Materials and Manufacturing Engineering},

volume = {87},

number = {1},

pages = {5-12},

publisher = {International OCSCO World Press},

abstract = {Purpose: The purpose of this article is the development of quantitative methods for assessing the quality of nanocomposite materials used in fuel cells. Design/methodology/approach: latinum is the most commonly used catalyst in fuel cells, commonly in the form of nanoparticles deposited on the surface of carbon black. Due to the nanometric size of platinum particles, transmission electron microscopy can be applied to evaluate the produced catalysts. TEM image also allow to determinate the approximate value of the chemical specific surface area) of platinum nanoparticles, but only in case of spherical particles. Findings: In present work, taking into account additional assumptions resulting directly from the analysis of microscopic images, the method of estimation of the particle diameter and the chemical specific surface area for nonsymmetrical (elongated) nanoparticles is present. Research limitations/implications: The presented work presents a method for determining the specific surface of platinum, when their shape is elongated. It is worth noting that the modified formulas for determining the particle diameter and the value of the chemically active specific surface of the platinum nanoparticles of the elongated shape are equivalent to the formulas previously given for spherical particles, if the particle length and its diameter are equal. In this case, patterns for symmetric particles and more general (modified) patterns can be used interchangeably. Practical implications: Development of new and more effective catalysts for fuel cells. Originality/value: The significance of the presented work results from the possibility of using the described method in the catalyst studies during real catalytic processes. It allows comparing catalytic activity after the process, also in unusual conditions and in an aggressive environment, using minimal amounts of material. © International OCSCO World Press. All rights reserved. 2018.},

note = {3},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85041558716,

title = {Copper matrix nanocomposites based on carbon nanotubes or graphene},

author = { D. Janas and B. Liszka},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85041558716&doi=10.1039%2fc7qm00316a&partnerID=40&md5=dc3e1f963afb67196ec2fa978438e0bf},

doi = {10.1039/c7qm00316a},

issn = {20521537},

year  = {2018},

date = {2018-01-01},

journal = {Materials Chemistry Frontiers},

volume = {2},

number = {1},

pages = {22-35},

publisher = {Royal Society of Chemistry},

abstract = {Recently, copper-nanocarbon composites have become the focal point of many research groups around the world. The reason for this phenomenon is that carbon nanotubes or graphene have proven that they can bring the technology of copper to a whole new level due to their extraordinary electrical, thermal and mechanical properties. The addition of even small amounts of nanocarbon into a copper matrix can significantly enhance its performance, but unfortunately integration of these two materials is not trivial. In this review article, we highlight methods of manufacture of Cu-nanocarbon composites and properties of the resulting material. We stress their strong and weak points as well as indicate pending challenges remaining to be sorted out to produce a nanocomposite of significantly improved properties as compared to neat Cu. Finally, we identify future directions, which must be taken to bring these materials closer to mass-production and eventually to real-life applications. © The Royal Society of Chemistry and the Chinese Chemical Society 2018},

note = {43},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84944711270,

title = {Partial oxidation of methane over Ni0/La2O3 bifunctional catalyst III. Steady state activity of methane total oxidation, dry reforming, steam reforming and partial oxidation. Sequences of elementary steps},

author = { T.H. Nguyen and A. Łamacz and A. Krztoń and B. Liszka and G. Djéga-Mariadassou},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84944711270&doi=10.1016%2fj.apcatb.2015.09.016&partnerID=40&md5=b0bd6f73c055f94f2e8368c8e08001ca},

doi = {10.1016/j.apcatb.2015.09.016},

issn = {09263373},

year  = {2016},

date = {2016-01-01},

journal = {Applied Catalysis B: Environmental},

volume = {182},

pages = {385-391},

publisher = {Elsevier},

abstract = {The bifunctional Ni0/La2O3 catalyst was studied in the partial oxidation of methane (POM). The indirect model of POM was established based on catalytic runs of total oxidation of methane (TOM), dry reforming (DRM) and steam reforming (SRM). It was proved that TOM occurs over La2O3 (as well in flowing POM feed), whereas DRM and SRM take place over Ni0. The sequences of elementary steps of each reaction are described based on previously published data from other authors. The reaction of total oxidation of methane supplies H2O and CO2 to SRM and DRM respectively. Therefore, SRM and DRM catalytic cycles are assisted by TOM whereas DRM and SRM are kinetically coupled on reduced metal active sites (Ni0). © 2015 Elsevier B.V.},

note = {28},

keywords = {},

pubstate = {published},

tppubtype = {article}

}