Article
Chemistry, Multidisciplinary
Gauravjyoti D. Kalita, Podma P. Sarmah, Golap Kalita, Pankaj Das
Summary: A facile ligand-assisted approach was used to synthesize bimetallic Au-Pd nanoparticles with a tunable core@shell structure. The Au-Pd materials exhibited superior performance in two important reactions, with the Pd-core-Au-shell structure showing higher activity compared to the Au-core-Pd-shell structure.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Multidisciplinary
Shuli Yin, Ziqiang Wang, Songliang Liu, Shiqian Jiao, Wenjing Tian, You Xu, Xiaonian Li, Liang Wang, Hongjing Wang
Summary: A flexible method was reported to synthesize Au@Pd core-shell mesoporous nanoflowers with excellent electrocatalytic activity and stability for methanol oxidation reaction. This versatile strategy can be used for the fabrication of core-shell mesoporous nanoflowers with adjustable composition.
Article
Chemistry, Physical
Huiru Yang, Liang Tian, Abdessamad Grirrane, Alberto Garcia-Baldovi, Jiajun Hu, German Sastre, Changwei Hu, Hermenegildo Garcia
Summary: Photodecarboxylation of hexanoic acid into alkanes using TiO2-supported Au-Pd catalysts showed better catalytic performance compared to monometallic Au or Pd catalysts. The bimetallic catalyst achieved 94.7% conversion of hexanoic acid and nearly 100% selectivity to pentane under UV-vis irradiation. The synergistic effect between Au and Pd in the nanostructured alloy was responsible for the enhanced activity.
Article
Chemistry, Physical
Jessi E. S. van der Hoeven, Jelena Jelic, Liselotte A. Olthof, Giorgio Totarella, Relinde J. A. van Dijk-Moes, Jean-Marc Krafft, Catherine Louis, Felix Studt, Alfons van Blaaderen, Petra E. de Jongh
Summary: The study investigates the performance of an Au-Pd core-shell catalyst in the selective hydrogenation of butadiene, showing shell-thickness-dependent catalytic activity, high selectivity, and activity up to 50 times greater than that of alloyed counterparts.
Article
Chemistry, Physical
Chih-Han Liu, Stephen Porter, Junjie Chen, Hien Pham, Eric J. Peterson, Prateek Khatri, Todd J. Toops, Abhaya Datye, Eleni A. Kyriakidou
Summary: In this study, the diesel oxidation performance of different Pd/Pt molar ratio catalysts under degreened (DG) and hydrothermally aged conditions was evaluated. It was found that Pd/Pt(1/3)/SiO2@Zr (DG) achieved the lowest temperature for CO and THCs conversion compared to other catalysts studied, indicating enhanced low temperature performance.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Nanoscience & Nanotechnology
Abdelrahman S. Khder, Hatem M. Altass, Rabab S. Jassas, Munirah M. Al-Rooqi, Menna A. Khder, Moataz Morad, Ahmed Gebreil, Ziad Moussa, Saleh A. Ahmed
Summary: In this study, five catalysts containing 1 wt % monometallic gold (Au), palladium (Pd), and bimetallic gold-palladium (Au-Pd) with different ratios supported by MgO were prepared using a modified impregnation approach. The structure of each catalyst was thoroughly examined, and their catalytic activity was evaluated using carbon monoxide oxidation. The results showed that loading Au and/or Pd nanoparticles (NPs) had no significant effects on the crystal size, surface area, or pore radius of MgO. The formation of Au/Pd alloy was observed at a Au/Pd ratio of 1:1, and Au-rich catalysts demonstrated superior catalytic performance toward CO oxidation compared to Pd-rich catalysts. The higher activity was attributed to the small particles of Au0 and the oxidized/partially oxidized species (Au+, Pd2+, and Pd delta+), which provided active sites and active oxygen necessary for CO2 formation.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yaru Zhang, Zhaocong Zheng, Zhankun Chen, Xiaozhao Wang, Wei Chen, Zhimin Gao, Jiamin Luo, Chen Lin, Wenyu Xie, Yuchi Wan, Meiling Tan, Donglian Liu, Zhiyao Hou
Summary: Researchers have successfully achieved reactive oxygen species (ROS) augmentation in mild photothermal therapy (mPTT) by fabricating Au@Pd bimetallic nanozyme. This nanozyme exhibits multienzymatic activities for photothermal conversion and induces ROS generation, which helps to suppress the heat-defense response of tumor cells and improves therapeutic efficacy.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Yu-Chuan Jiang, Hui-Ying Sun, Ya-Nan Li, Jia-Wei He, Qi Xue, Xinlong Tian, Fu-Min Li, Shi-Bin Yin, Dong-Sheng Li, Yu Chen
Summary: The Pd@RhPd NDs synthesized exhibit high catalytic activity in methanol electrolysis, indicating great potential for efficient hydrogen production.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Xiaoyun Guo, Zheng Hu, Jianxin Lv, Hui Li, Qinghua Zhang, Lin Gu, Wei Zhou, Jiangwei Zhang, Shi Hu
Summary: Doping with interstitial hydrogen atoms is an effective way to enhance the performance of metal catalysts. The Pd@Rh-H catalyst shows superior electrocatalytic methanol oxidation compared to commercial Pt/C, with optimized charge transfer and binding energy due to the synergy between Rh and Pd. Theoretical calculations and material analysis provide insights into the potential mechanism underlying the enhanced performance of Pd@Rh-H.
Article
Chemistry, Multidisciplinary
Yaxing Liu, Weiyin Li, Guizhe Zhao, Gang Qin, Yuexia Li, Yaqing Liu
Summary: The study investigates the microstructural evolution of heterogeneous catalytic materials during the methanol electrooxidation reaction using a typical Au@Pd core-shell nanostructure. It reveals that an Au/Pd mixed bimetallic shell formed during the reaction reduces the binding strength of OH- and CO on the catalyst surface, leading to increased electrocatalytic activity. The exposed Au atoms in the shell region also produce large-scale reactive center dot OH radicals that facilitate the oxidative removal of adsorbed carbonaceous species from the adjacent Pd active sites.
Article
Electrochemistry
Xiaobo Yang, Xili Tong, Xingchen Liu, Kaixi Li, Nianjun Yang
Summary: A series of Ag-core/Pd-shell catalysts were synthesized and it was found that the Ag@Pd-3 catalyst exhibited the best performance for the methanol oxidation reaction. This catalyst showed significantly higher mass activity and specific activity compared to a Pd/C catalyst, making it a promising candidate for high-performance DMFCs. Computational calculations indicated that the enhanced performance of the Ag@Pd-3 catalyst was due to a stronger adsorption of CH3OH and OH on the Pd active sites.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Xiaoyu Qiu, Veronica Pawlik, Shan Zhou, Jing Tao, Younan Xia
Summary: Two growth patterns of Au atoms on penta-twinned Pd decahedra were reported, resulting in asymmetric Pd-Au Janus icosahedra and anisotropic Pd@Au core-shell starfishes, respectively. The injection rate of Au(III) ions determined the growth pattern, with slow injection leading to asymmetric growth and fast injection resulting in symmetric growth. Mechanistic analysis revealed the formation process of the two heterostructures.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Analytical
Vadym Borysiuk, Iakov A. Lyashenko, Valentin L. Popov
Summary: Thermal stability of triple layered Au@Pt@Au core-shell nanoparticles for H2O2 bi-directional sensing was investigated through computational study. The raspberry-like shape of the nanoparticles and their structural parameters were studied using classical molecular dynamics simulations. The results showed that the core-shell structure of the nanoparticles was maintained up to approximately 900 K, but was destroyed at higher temperatures.
Article
Chemistry, Multidisciplinary
Haiyang Wang, Dongxia Zhang, Ruiyin Zhang, Hao Ma, Huimin Zhang, Ruijuan Yao, Miaomiao Liang, Yuzhen Zhao, Zongcheng Miao
Summary: Nanorod-structured (Au-Pd)/CeO2 catalysts with different Au/Pd ratios were prepared through dealloying and calcination treatment. Characterization techniques were used to study the structure and physicochemical properties. The (Pd0.15-Au0.15)/CeO2 catalyst calcined at 500°C showed the highest catalytic activity for CO oxidation, reaching 50% and 99% conversion temperatures as low as 50°C and 85°C, respectively. This superior catalytic property is attributed to the robust nanorod structure and introduction of Pd and Au.
Article
Chemistry, Multidisciplinary
Meng Lyu, Jianwei Zheng, Claire Coulthard, Jing Ren, Yufei Zhao, Shik Chi Edman Tsang, Chunping Chen, Dermot O'Hare
Summary: Well-dispersed core-shell catalyst precursors using silica@CuxZnAl-LDHs show significantly enhanced catalytic performance in converting CO2 to methanol.
Article
Chemistry, Physical
Jaroslaw Milewski, Karol Cwieka, Arkadiusz Szczesniak, Lukasz Szablowski, Tomasz Wejrzanowski, Jakub Skibinski, Olaf Dybinski, Aleksandra Lysik, Arkadiusz Sienko, Pawel Stanger
Summary: The study explores the possibility of enhancing the manufacturing process of MCFC cathodes by utilizing precious, semi-precious, and rare earth metals obtained from waste electric and electronic equipment (WEEE). As MCFC components are not sensitive to ceramic and metal impurities, the addition of noble metals recovered from WEEE as catalysts is economically viable. Experimental research demonstrates the positive impact of using 20% recycled electronic scrap in fabricating MCFC cathodes, with powder marked as 4/1 showing superior performance at 550 degrees C compared to the reference cell.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Abdul Qayyum, Dimitrios A. Giannakoudakis, Alec P. LaGrow, Oleksandr Bondarchuk, Dariusz Lomot, Juan Carlos Colmenares
Summary: In this study, one-dimensional nanostructured titanate materials decorated with nanoclusters were synthesized using an ultrasound-assisted precipitation method. These materials exhibited high yield in the selective photo-oxidation of benzyl alcohol.
CATALYSIS COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Rafal Maksymilian Molak, Bartosz Moronczyk, Ewa Ura-Binczyk, Zbigniew Pakiela, Wojciech Zorawski, Krzysztof Jan Kurzydlowski, Seiji Kuroda
Summary: Aluminium (Al) and titanium (Ti) coatings were applied on AZ91E magnesium alloy using a low-pressure warm spray method with different nitrogen flow rates (NFR). The effects of NFR on coating microstructure and physical properties were systematically studied. The results showed that decreasing NFR resulted in denser and more compact coatings, but also increased powder oxidation. Al coatings exhibited lower hardness and wear resistance compared to Ti coatings, but were more suitable for corrosion protection due to their low porosity and high compactness.
Article
Chemistry, Physical
Marta Dobrosielska, Renata Dobrucka, Dariusz Brzakalski, Milosz Frydrych, Paulina Kozera, Monika Wieczorek, Marek Jalbrzykowski, Krzysztof J. Kurzydlowski, Robert E. Przekop
Summary: Fractionation of diatomaceous earth allowed for obtaining a range of particle sizes, with modification using the smallest particles resulting in improved impact strength, melt flow rate, and elasticity of the PLA composite material.
Review
Chemistry, Multidisciplinary
Dimitrios A. Giannakoudakis, Foteini F. Zormpa, Antigoni G. Margellou, Abdul Qayyum, Ramon Fernando Colmenares-Quintero, Christophe Len, Juan Carlos Colmenares, Konstantinos S. Triantafyllidis
Summary: The development of efficient and sustainable catalytic processes is crucial for large-scale production of renewable chemicals and environmental pollution control. Carbon-based nanocatalysts are a promising class of materials for biomass valorization and environmental remediation.
Review
Biotechnology & Applied Microbiology
Soumya Koippully Manikandan, Dimitrios A. Giannakoudakis, Jovana R. Prekodravac, Vaishakh Nair, Juan Carlos Colmenares
Summary: This article focuses on the use of material supports for developing immobilized biocatalysts in various applications. Different types of materials, including organic, inorganic, and composites, have been shown to be effective for supporting the immobilization of enzymes and microbial cells. Nanomaterial supports offer advantages such as large surface area and comfortable compartments for immobilization. The choice of catalyst support depends on the interaction between the material and the enzyme or microbial cell.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Article
Chemistry, Physical
Yunqi Tang, Chun Hong Mak, Chen Wang, Yu Fu, Fang-Fang Li, Guohua Jia, Chang-Wei Hsieh, Hsin-Hui Shen, Juan Carlos Colmenares, Haisheng Song, Mingjian Yuan, Yue Chen, Hsien-Yi Hsu
Summary: By developing a novel environmentally friendly mixed halide perovskite MA(3)Bi(2)Cl(9-x)I(x), visible-light photocatalytic hydrogen production is achieved, and the bandgap funnel structure promotes photoinduced charge transfer, leading to enhanced photocatalytic redox reaction efficiency.
Article
Biochemistry & Molecular Biology
Piya Roychoudhury, Aleksandra Golubeva, Przemyslaw Dabek, Oleksandra Pryshchepa, Gulyaim Sagandykova, Pawel Pomastowski, Michal Gloc, Renata Dobrucka, Krzysztof Kurzydlowski, Boguslaw Buszewski, Andrzej Witkowski
Summary: In this study, Pseudostaurosira trainorii mediated biosynthesized iron-oxide nanoparticles (IONPs) were used as nanostructures to assist ionization and desorption in laser desorption/ionization mass spectrometry (LDI-MS). These biogenic IONPs showed high catalytic properties and sensitivity towards small molecules, demonstrating their potential application in future nanobiotechnology and preparation of NALDI plates.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Physics, Condensed Matter
Mubashir Mansoor, Mehya Mansoor, Maryam Mansoor, Zuhal Er, Kamil Czelej, Mustafa Uergen
Summary: Functional materials for high-pressure transduction are limited, making them highly sought after. Zirconium silicate has been suggested as a Raman spectroscopic pressure sensor, as hydrostatic pressures greatly influence its Raman shifts. However, there are numerous challenges in mass applications of Raman-based sensor technology. In addition, we found that ZrSiO4 exhibits pressure-dependent infrared spectra and its IR peaks are sensitive to shear stresses and non-hydrostatic pressures, making it a unique sensor for determining various mechanical stresses through IR spectroscopy.
SOLID STATE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Michal Stor, Kamil Czelej, Andrzej Krasinski, Leon Gradon
Summary: Halloysite particles, with their unique multilayer nanostructure, are demonstrated as highly efficient sorbent of heavy metals. Various purification methods were applied to obtain a developed structure. DFT calculations and experimental results confirm the high sorption potential of modified halloysite towards heavy metals.
Article
Materials Science, Multidisciplinary
Lukasz Werner, Zuzanna Bojarska, Marta Mazurkiewicz-Pawlicka, Kamil Czelej, Boguslaw Mierzwa, Lukasz Makowski
Summary: This study presents a novel and facile synthesis method for ReS2 nanoparticles through wet chemical synthesis and annealing. The crystallinity and phase composition of the nanoparticles can be tuned by controlling the process parameters. The synthesized nanoparticles exhibit superior electrocatalytic hydrogen generation performance compared to commercially available ReS2, which can be explained by the formation of ReS2/ReO3 nanocomposites where a small fraction of metallic ReO3 decorates ReS2 nanoparticles. Density functional theory calculations provide insights into the electronic structure and the beneficial impact of ReO3 on the electrocatalytic performance of ReS2 nanoparticles. These findings have important implications for optimizing the electrocatalytic performance of ReS2 nanoparticles and provide a facile strategy for their efficient synthesis.
APPLIED MATERIALS TODAY
(2023)
Article
Materials Science, Multidisciplinary
Mark Fedorov, Jan S. Wrobel, Witold Chrominski, Grzegorz Cieslak, Magdalena Plocinska, Krzysztof J. Kurzydlowski, Duc Nguyen-Manh
Summary: The relative phase stability of fcc and bcc Cr-Fe-Mn-Ni alloys was studied using density functional theory, cluster expansion (CE), and Monte Carlo (MC) simulations. The CE models enabled the calculation of Gibbs free energies of formation for different compositions, and the MC simulations provided insights into the stability of these alloys at different temperatures. The results obtained were in line with experimental data and helped identify the alloys that are predicted to have a single fcc phase over a wide temperature range.
Article
Engineering, Environmental
Karol Cwieka, Zuzanna Bojarska, Kamil Czelej, Dariusz Lomot, Przemyslaw Dziegielewski, Alexey Maximenko, Kostiantyn Nikiforow, Leon Grado, Ming-Yu Qi, Yi-Jun Xu, Juan Carlos Colmenares
Summary: In this study, atomically dispersed Cu on TiO2 composite nanoparticles synthesized by the wet impregnation method were shown to be highly active and selective in hydrogen production by photoreforming of methanol. The photocatalyst exhibited a significant quantum efficiency and clean and sustainable characteristics.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Madhavi H. Dalsaniya, Krzysztof Jan Kurzydlowski, Dominik Kurzydlowski
Summary: Understanding the properties of molecular solids at high pressure is crucial for the development of new solid-state theories. This study applies a hybrid density functional theory approach to simulate the behavior of elemental bromine under high pressure. The results accurately reproduce experimental observations and provide insights into the metallic properties of different phases.
Article
Chemistry, Physical
Karol Cwieka, Jakub Skibinski
Summary: The elastic properties of open-cell metallic foams are influenced by both relative density and pore size variation. The Young's modulus and Poisson's ratio can be reduced when there is an increase in pore size variation, even with similar porosity.