Article
Chemistry, Physical
Kveta Jiratova, Petr Soukal, Anna Kapran, Timur Babii, Jana Balabanova, Martin Kostejn, Martin Cada, Jaroslav Maixner, Pavel Topka, Zdenek Hubicka, Frantisek Kovanda
Summary: A novel method was studied to prepare Ni-Cu oxide catalysts by deposition on stainless steel meshes using hollow cathode plasma jet sputtering. This method allows the preparation of thin oxide films, making the whole volume of the active phase readily accessible for reactants in catalytic reactions. The activity of the sputtered catalyst was significantly higher in ethanol and toluene oxidation compared to the granular catalyst. This outstanding performance was attributed to the synergistic effect between copper and nickel components.
Article
Chemistry, Physical
Kveta Jiratova, Roman Perekrestov, Michaela Dvorakova, Jana Balabanova, Martin Kostejn, Martin Vesely, Martin Cada, Pavel Topka, Dana Pokorna, Zdenek Hubicka, Frantisek Kovanda
Summary: Magnetron sputtering is an advantageous method for preparing catalysts supported on stainless steel meshes, particularly for processes carried out at high space velocities. The CoOx-MnOx and CoOx-CoMnOx catalysts showed high catalytic activity on stainless steel meshes, with the thinnest layer displaying the highest catalytic activity. Compared to the commercial pelletized Co-Mn-Al mixed oxide catalyst, the sputtered catalysts demonstrated significantly higher catalytic activity despite lower content of the Co and Mn active components.
Article
Chemistry, Physical
Ieva Barauskiene, Eugenijus Valatka
Summary: This study investigated the electrophoretic deposition of coatings consisting primarily of cobalt, nickel, and iron oxides on stainless steel surfaces. The Co-Ni-Fe oxides were synthesized through thermal decomposition of metal nitrates with different molar ratios. The findings showed that the deposited coatings were mainly composed of spinel-type oxides with round-shaped particles, and the iron content influenced the electrochemical activity of Co-Ni-Fe oxides.
Article
Environmental Sciences
Pavel Topka, Kvetuse Jiratova, Michaela Dvorakova, Jana Balabanova, Martin Kostejn, Frantisek Kovanda
Summary: This study aimed to develop a novel method for preparing structured Co-Mn mixed oxide catalysts by depositing the active phase on stainless steel meshes through hydrothermal synthesis. The catalysts exhibited significantly higher catalytic activity in ethanol oxidation compared to commercial pelleted Co-Mn-Al catalysts, with the activity correlating with the proportion of surface oxygen vacancies determined by XPS. The exceptional activity of the catalyst with a Co:Mn ratio of 0.5 was attributed to the high number of oxygen vacancies and exceptional redox properties.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Energy & Fuels
Yanhong Liu, Kewei Zhang, Dongxu Zhang, Weixuan Dong, Tianyao Jiang, Hongbo Zhou, Lixia Li, Baodong Mao
Summary: The study demonstrates that industrial 316L stainless steel meshes exhibit excellent electrocatalytic hydrogen evolution reaction (HER) activity in acidic conditions. The HER performance increases with the increase of mesh number up to a certain point, but starts to decrease when the mesh number goes beyond a certain threshold. The research provides valuable insights for improving the performance of low-cost industrial electrodes towards scalable electrocatalytic hydrogen production and renewable energy storage.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Chemistry, Physical
Ashwini Pol, Suchitra Sapakal, Ayesha Khan, Anamika V. Kadam
Summary: Deposition of nickel oxide (NiO) films on 304-grade stainless steel (304SS) substrate by a simple hydrothermal method is studied for water splitting. The NiO on 304SS shows excellent oxygen evolution reaction (OER) with good stability, low overpotential, and suitable Tafel slope.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
P. P. Sahay
Summary: Co3O4-NiO based nanocomposite films were electrochemically deposited onto FTO glass substrates in aqueous solutions with different mole ratios of cobalt (II) and nickel (II). The structural analysis revealed that the Co3O4 cubic phase dominated the composite films, leading to higher specific capacitance. The composite films showed different structures and exhibited higher specific capacitance due to the synergistic effect of the two metal oxides.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Wolfgang Tillmann, Nelson Filipe Lopes Dias, Dominic Stangier, Christopher Schaak, Simon Hoeges
Summary: This study demonstrates that heat treatment increases the hardness of 17-4 PH steel, which helps reduce friction and wear, maximizing the tribological functionality of DLC coatings.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Jiajun Lu, Weidong Liu, Yonghua Zhao
Summary: This study investigates the influence of the processing method of bulk material on the surface microstructure of the resultant workpiece in electrochemical jet texturing (EJT). The experimental results reveal evident anisotropic behavior of the texture and demonstrate the considerable influence of the rolling process on EJT.
MATERIALS & DESIGN
(2022)
Review
Chemistry, Physical
Hong Zhao, Wai-Yu Ashley Lam, Li Sheng, Li Wang, Peng Bai, Yang Yang, Dongsheng Ren, Hong Xu, Xiangming He
Summary: This review article presents the progress of cobalt-free cathodes made with lithium-rich oxides, nickel-rich layered oxides, and spinel lithium nickel manganese oxide (LNMO). The roles of cobalt are clarified, and the performance and commercialization prospects of these materials are objectively assessed.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Applied
Li Cao, Jun Zhou, Hong Hao, Prabir K. Dutta
Summary: This study investigated two types of zeolite meshes for oil/water separation, finding that the secondary grown zeolite mesh exhibited high separation efficiency and good repeatability, showing potential for application in the field of oil/water separation.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Physical
Youngjin Kim, Won Mo Seong, Arumugam Manthiram
Summary: This article discusses the necessity and key factors for developing cobalt-free high-Ni layered oxides from the perspective of materials science and electrochemistry. Several aspects that need to be considered and the exploration of alternative dopants and substituents are proposed.
ENERGY STORAGE MATERIALS
(2021)
Article
Engineering, Environmental
Xinjuan Zeng, Wei Zhou, Peizhang Zhou, Min Zhang, Cailong Zhou, Luxi Tan, Lin Wang
Summary: In this study, a leaf-like zeolitic imidazolate framework ZIF-L(Co) coated stainless steel mesh (ZIF-L(Co)@SSM) with superlyophobicity was fabricated through a simple one-pot method. By taking advantage of strong coordination interaction, the ZIF-L(Co)@SSM can be easily modified and achieve highly effective organic liquids separation with efficiency above 96%. This simple preparation route and excellent performance make the MOFs coated meshes suitable for various organic liquid separation practices.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Mohsin Khan, Ghazi Aman Nowsherwan, Aqeel Ahmed Shah, Saira Riaz, Muhammad Riaz, Ali Dad Chandio, Abdul Karim Shah, Iftikhar Ahmed Channa, Syed Sajjad Hussain, Rashid Ali, Shahzad Naseem, Muhammad Ali Shar, Abdulaziz Alhazaa
Summary: This research study focused on the preparation of Ni-doped AlN thin films by using DC and RF magnetron sputtering for optoelectronic applications. Several spectroscopy and microscopy techniques were considered for the characterization of structural, morphological, chemical bonding, and emission properties of the films. The results suggest that Ni: AlN is a promising candidate for optoelectronic applications.
Article
Engineering, Mechanical
E. Sharifi, S. Khamseh, A. S. Shirani, B. Ramezanzadeh
Summary: In this study, the conversion of cathode magnetic field configuration from balanced magnetron (BM) to unbalanced magnetron (UBM) in a reactive DC magnetron sputtering system was explored. The microstructural, mechanical, and tribological characteristics of BM and UBM sputtered Nb:doped amorphous carbon films were investigated and compared. The results showed that the UBM configuration resulted in reduced surface roughness, increased hardness and elastic modulus, but also increased coefficient of friction and wear rate.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Materials Science, Coatings & Films
Anna Kapran, Vinicius G. Antunes, Zdenek Hubicka, Charles Ballage, Tiberiu Minea
Summary: This study focuses on the influence of different magnetic field configurations of a high-power impulse magnetron sputtering (HiPIMS) in a nonreactive mode on the film precursors. The ionized flux fraction and total flux deposited onto the substrate were measured. The degree of magnetron balancing and the geometry of the magnetic field were investigated as crucial factors influencing the thin film deposition for different HiPIMS pulse lengths.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Polymer Science
Katerina Setnickova, Karel Jerabek, Tomas Strasak, Monika Mullerova, Vera Jandova, Karel Soukup, Roman Petrickovic, Hui-Hsin Tseng, Petr Uchytil
Summary: In recent years, there has been extensive research on porous materials due to their excellent properties and potential use in various areas. Hyper-crosslinked porous polymers (HCLPs) have attracted attention because of their high surface area, porosity, low density, stability, and superior adsorption capabilities. This study focuses on the synthesis, characterization, and gas adsorption performance of a series of novel styrene-based HCLPs, which were prepared through a two-step process involving radical copolymerization and impregnation with polyamines. The impregnation significantly improved the selectivity of CO2/N-2 and CO2/CH4 adsorption.
Article
Chemistry, Physical
Kveta Kupkova, Pavel Topka, Jana Balabanova, Martin Kostejn, Kvetuse Jiratova, Jean-Marc Giraudon, Jean-Francois Lamonier, Jaroslav Maixner, Frantisek Kovanda
Summary: The effect of Co-Cu oxide catalysts composition on their physicochemical properties and performance in the deep oxidation of ethanol was investigated. The catalysts were characterized and it was found that CuO promoted the reduction of Co3O4. The Co-Cu oxide catalyst with a Co:Cu molar ratio of 4:1 exhibited the best performance in ethanol gas-phase oxidation due to the synergistic effect between Co and Cu components and the presence of finely dispersed CuO particles on the surface of Co3O4.
Article
Biochemistry & Molecular Biology
Karel Soukup, Pavel Topka, Jaroslav Kupcik, Olga Solcova
Summary: This paper reports the preparation of a thermally stable polybenzimidazole electrospun membrane as a support for a platinum catalyst used in the total oxidation of volatile organic compounds. Compared with commercial pelletized catalysts, the membrane with high porosity provides easy accessibility to the platinum active sites and exhibits a low pressure drop. Catalysts with desired platinum particle sizes were obtained by tuning the preparation conditions. The catalyst containing only 0.08 wt.% of platinum achieved high conversion of all model volatile organic compounds at moderate temperatures, which is important for cost reduction of emission abatement technology.
Article
Physics, Fluids & Plasmas
R. Hippler, M. Cada, A. Mutzke, Z. Hubicka
Summary: The study investigates the relationship between the pulse length and discharge characteristics of a reactive HiPIMS discharge with a tungsten cathode in an argon+oxygen gas mixture. The discharge is operated with pulse lengths varying from 20-500 μs. Measurements of discharge current, optical emission spectroscopy, and energy-resolved ion mass spectrometry were conducted. The results show a significant dependence of discharge current on pulse length, as well as a decrease in ion ratios due to target cleaning. Simulation results reveal the formation of a non-stoichiometric sub-surface compound layer, which depends on the impinging ion composition and pulse length.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Kveta Jiratova, Petr Soukal, Anna Kapran, Timur Babii, Jana Balabanova, Martin Kostejn, Martin Cada, Jaroslav Maixner, Pavel Topka, Zdenek Hubicka, Frantisek Kovanda
Summary: A novel method was studied to prepare Ni-Cu oxide catalysts by deposition on stainless steel meshes using hollow cathode plasma jet sputtering. This method allows the preparation of thin oxide films, making the whole volume of the active phase readily accessible for reactants in catalytic reactions. The activity of the sputtered catalyst was significantly higher in ethanol and toluene oxidation compared to the granular catalyst. This outstanding performance was attributed to the synergistic effect between copper and nickel components.
Article
Materials Science, Multidisciplinary
Anna Kapran, Rainer Hippler, Harm Wulff, Jiri Olejnicek, Aneta Pisarikova, Martin Cada, Zdenek Hubicka
Summary: In this experiment, a hollow cathode discharge with a CuNi cathode is used to study the plasma ions in a vacuum chamber with Ar and O2 gases. It is found that Ar+ and O+2 ions are the most abundant species. The deposition rate and heat flux increase with the discharge current, and at high pressures, the directional gas flow further enhances the deposition rate. X-ray diffraction and Raman spectroscopy analysis reveal that the deposited films are composed of a mixed CuxNi1-xO cubic phase with a preferred (111) orientation. Upon annealing, the CuxNi1-xO phase separates into NiO and CuO sub-phases. The annealed films exhibit photoelectrochemical activity as a photocathode, but this activity deteriorates over time due to the reduction of CuO to Cu2O.