Article
Electrochemistry
Julia Alvarez-Malmagro, Manuela Rueda, Francisco Prieto-Dapena
Summary: The adsorption of guanine on gold electrodes was studied using cyclic voltammetry and ATR-SEIRA spectroscopy. The results showed that the adsorption process depends on the pH value, and different tautomeric forms of guanine were observed in solution and in the adsorbed state. The orientation of the adsorbed guanine molecules and the preponderance of different tautomeric forms were also influenced by the electric field.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Theo Faverge, Bruno Gilles, Antoine Bonnefont, Frederic Maillard, Christophe Coutanceau, Marian Chatenet
Summary: The mechanisms of oxidation of glucose, gluconic acid, and sorbitol on gold, platinum, and palladium are investigated using cyclic voltammetry, differential electrochemical mass spectrometry, and in situ Fourier transform infrared spectroscopy. The nature of the reactant significantly influences the onset of the oxidation reaction, with glucose's anomeric function oxidized at low potentials on all three surfaces, while gluconic acid and sorbitol poison the surface at low potentials. Different reaction pathways are observed based on the metal surface, and gold features the best activity, selectivity, and specificity for glucose oxidation into gluconate at low potentials. The study highlights the dependence of the mechanism on reactant, catalyst, and potential.
Article
Chemistry, Physical
Theo Faverge, Bruno Gilles, Antoine Bonnefont, Frederic Maillard, Christophe Coutanceau, Marian Chatenet
Summary: The oxidation mechanisms of glucose, gluconic acid, and sorbitol on gold, platinum, and palladium surfaces were studied using cyclic voltammetry, differential electrochemical mass spectrometry, and in situ Fourier transform infrared spectroscopy. The nature of the reactant influenced the onset of the oxidation reaction, with glucose being oxidized at low potentials on all three surfaces, while gluconic acid and sorbitol exhibited poisoning effects. The metal surface also influenced the reaction pathways, with glucose oxidation being initiated through the partial dissociative adsorption of glucose on all three surfaces. Gold demonstrated the highest activity, selectivity, and specificity for glucose oxidation to gluconate at low potentials. The study reveals a reactant, catalyst, and potential-dependent mechanism.
Article
Chemistry, Multidisciplinary
Yue Liu, Qiong-Lan Wang, Yao-Yue Yang
Summary: This study investigates the mechanism of methanol oxidation reaction (MOR) on rhodium (Rh) electrodes using in situ electrochemical techniques. The results show that Rh electrodes are more active in alkaline media and CO2 and formate are identified as MOR products. These findings provide valuable insights for the design and fabrication of efficient Rh-based catalysts.
Article
Chemistry, Analytical
Georg Schwendt, Sergey M. Borisov
Summary: Temperature is a crucial factor for accurate assessment of oxygen concentration using optical sensors. A sensor capable of simultaneous detection of oxygen and temperature using a single emitter is highly advantageous but rare. We investigated 15 Pd(II) and 6 Pt(II) complexes of π-extended porphyrins and found that quinone-extended benzo-porphyrins exhibited high ratios of thermally activated delayed fluorescence (TADF) to phosphorescence, representing a significant improvement compared to benchmark porphyrins. By converting phosphorescence to TADF with increasing temperature, both temperature and oxygen concentration can be measured accurately.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Yingzhen Chen, Christian Rodenbuecher, Klaus Wippermann, Carsten Korte
Summary: In this study, the electrochemical behavior of platinum electrodes in protic ionic liquids (PILs) was investigated using in situ Fourier-transform infrared spectroscopy coupled with cyclic voltammetry. The results provided direct evidence of the change of water at the Pt electrode surface due to Pt oxide formation and reduction. It was also found that anion adsorption could block catalytic sites and reducing it could enhance the ORR activity.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Ryo Hosoda, Naoki Kamoshida, Nagahiro Hoshi, Yasuaki Einaga, Masashi Nakamura
Summary: The oxidation of dopamine on a boron-doped diamond electrode was investigated using in situ attenuated total reflection infrared spectroscopy and infrared reflection absorption spectroscopy. The study revealed that dopamine oxidation led to polymerization and the continuous deposition of polymerized dopamine on the electrode, resulting in irreversible behavior of the voltammogram.
Article
Chemistry, Physical
Iosif Mangoufis-Giasin, Lukas Fusek, Tian Yang, Peyman Khanipour, Olaf Brummel, Jorg Libuda, Karl J. J. Mayrhofer, Federico Calle-Vallejo, Ioannis Katsounaros
Summary: This study explores the oxidation of 2-propanol in alkaline solutions on different noble metal electrodes. It is found that the reaction is selective to acetone, and C-C bond breaking and the formation of adsorbed CO do not occur. The onset potential increases with Rh < Pt < Pd < Au, correlating with the adsorption energy of acetone. The rate of oxidation decays under potentiostatic conditions, and at high overpotentials, the reaction is limited by oxide formation. The research suggests a broader range of materials for efficient anodes in 2-propanol fuel cells, not limited to platinum-based electrodes.
Article
Chemistry, Multidisciplinary
Chen Wang, Wei Gao, Xinhao Wan, Bin Yao, Wenjing Mu, Jie Gao, Qiangang Fu, Dan Wen
Summary: The study proposed a three-dimensional hierarchical noble metal aerogel with abundant sites and channels to enhance electrocatalytic performance and reduce usage. Novel Pd aerogels were prepared through in situ electrochemical activation of PdOx aerogels, showing great potential for fuel cell anodic electrocatalysis.
Article
Chemistry, Physical
Mariana C. O. Monteiro, Akansha Goyal, Pricilla Moerland, Marc T. M. Koper
Summary: This study investigates how the cation identity and concentration affect the kinetics of the hydrogen evolution reaction on platinum and gold electrodes. Weakly hydrated cations favor HER on gold at low overpotentials, while strongly hydrated cations exhibit higher activity in more alkaline pH conditions. The inhibition of HER by weakly hydrated cations is observed on platinum even at lower alkalinity and concentrations, suggesting a stronger interaction between platinum and metal cations.
Article
Chemistry, Analytical
Vera L. Marinho, Ermete Antolini, M. Janete Giz, Giuseppe A. Camara, Leandro A. Pocrifka, Raimundo R. Passos
Summary: In this study, binary Pt-based electrocatalysts with different compositions were prepared and tested for ethylene glycol oxidation reaction. The results showed that PtPd catalyst with 32% Pd exhibited the highest catalytic activity for EGOR. Additionally, the presence of Pd was found to increase the production of glycolate while inhibiting the formation of carbonate.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Walid Dachraoui, Rolf Erni
Summary: This study utilizes in situ liquid cell scanning transmission electron microscopy to track the growth of Pd nanoparticles at the atomic scale. The results reveal that the formation of Pd nanoparticles involves multiple steps, including nonclassical nucleation and multi-step growth processes. These findings confirm the importance of element-specific interactions in determining the pathway of crystalline nanoparticle formation, even under identical synthesis conditions.
CHEMISTRY OF MATERIALS
(2023)
Article
Metallurgy & Metallurgical Engineering
Huan Li, Elsayed Oraby, G. A. Bezuidenhout, Jacques Eksteen
Summary: The study explores a novel method of alkaline ferricyanide leaching to extract palladium (Pd) from a platinum-group metal (PGM) oxide ore containing Ni and Cu in Western Australia. The alkaline ferricyanide acts as both a leaching agent and an oxidant. Various parameters such as ferricyanide concentration, dissolved oxygen level, pH, and temperature were investigated, and the results show that Pd extraction is most sensitive to leach temperature. The alkaline ferricyanide leaching system exhibits high selectivity for Pd over other metals and significantly improves the settleability and filterability of the leaching slurry.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2023)
Article
Chemistry, Physical
Samuel R. Bottum, Taylor S. Teitsworth, Qi Han, Andre D. Orr, Jin-Sung Park, Xiaofan Jia, Chiara Cappuccino, Bobby H. Layne, Nilay Hazari, Javier J. Concepcion, Carrie L. Donley, Dmitry E. Polyansky, Matthew R. Lockett, James F. Cahoon, David C. Grills
Summary: In situ mid-infrared spectroscopy is a powerful technique for understanding the mechanism of CO2 reduction catalysts, while hybrid photoelectrodes, composed of a semiconductor and a molecular catalyst, are promising for sunlight-driven catalysis. We developed a new strategy using ATR-IR spectroscopy coupled with electrochemistry to characterize catalysts directly integrated with a semiconductor surface under applied potential. This technique allows for the investigation of redox processes associated with CO2 reduction catalysts on Si electrode surfaces with high sensitivity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Instruments & Instrumentation
Luis G. Vieira
Summary: Comprehensive modeling of non-polarized infrared attenuated total reflection spectrum based on Fresnel equations and wavenumber-dependent dielectric function models is proven to be an effective method to retrieve optical functions. The method is validated and its reliability is demonstrated by comparing the computed refractive index of water with literature data.
APPLIED SPECTROSCOPY
(2023)
Article
Materials Science, Multidisciplinary
Adhigan Murali, Mohan Sakar, Sahariya Priya, V. Vijayavarman, Sadanand Pandey, Ryansu Sai, Yu Katayama, M. Abdul Kader, Kothandaraman Ramanujam
Summary: Solid-state polymer electrolytes have the potential to enhance the safety of lithium-ion batteries by avoiding safety risks associated with liquid electrolytes. Introducing polymer electrolytes can help reduce the formation of lithium dendrites and strengthen the interface between electrodes and electrolytes, leading to improved electrochemical properties.
Article
Energy & Fuels
Mikihiro Takahashi, Shoichi Tsujioka, Wataru Kawabata, Ryansu Sai, Hiromori Tsutsumi, Yu Katayama
Summary: This study developed a series of lithium borates as potential electrolytes for lithium-ion batteries and evaluated their thermal and electrochemical stability. Lithium borates with CF3 groups and smaller anion size exhibited better cycle performance and ionic conductivity. The findings suggest that the new lithium borates, HHIB2 and HHIB-F-2, are promising lithium salts for lithium-ion batteries.
JOURNAL OF PHYSICS-ENERGY
(2023)
Review
Chemistry, Physical
Hirokazu Kojima, Kensaku Nagasawa, Naoto Todoroki, Yoshikazu Ito, Toshiaki Matsui, Ryo Nakajima
Summary: The development of renewable energy technologies is crucial for achieving carbon neutrality. Stable storage and transportation of hydrogen in large quantities can maximize power utilization. A detailed understanding of the characteristics and operating methods of fluctuating power-driven water electrolysis technologies is essential for green hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Koki Yamada, Hiromori Tsutsumi, Yu Katayama
Summary: Understanding the surface electrochemistry of polymer electrolytes is crucial for optimizing lithium batteries. This study investigates the (electro)chemical process of a specific polymer electrolyte on a copper electrode, and reveals the formation of a solid electrolyte interphase (SEI)-like layer involving multiple reduction steps. The study also identifies the components responsible for the most resistive SEI-like layer, and demonstrates the significant reduction of its resistance. This research provides valuable insights into the SEI component and interfacial resistance relationship in polymer electrolyte systems.
Article
Chemistry, Physical
Matthew Spry, Olivia Westhead, Romain Tort, Benjamin Moss, Yu Katayama, Maria-Magdalena Titirici, Ifan E. L. Stephens, Alexander Bagger
Summary: Adding a small amount of water as an electrolyte additive can greatly improve the Faradaic selectivity of nitrogen reduction to ammonia in a lithium-mediated system under ambient conditions.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Saki Sawayama, Riko Ochi, Tsubasa Kawaguchi, Yu Katayama, Masayuki Morita, Kenta Fujii
Summary: We present highly concentrated electrolytes prepared with a fluorinated acetate solvent, which allows for a favorable electrode reaction in Li-ion batteries. The electrolyte consisting of 2,2,2-trifluoroethyl acetate (TFEAc) solvent and 3.2 mol dm(-3) LiFSA salt demonstrated improved charge-discharge behavior on the graphite negative electrode compared to an analogous electrolyte. The lower activation energy (E-a) of the graphite electrode reaction in the concentrated LiFSA/TFEAc electrolyte contributes to its kinetically unique behavior.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Shinji Kondou, Yusuke Sakashita, Asuka Morinaga, Yu Katayama, Kaoru Dokko, Masayoshi Watanabe, Kazuhide Ueno
Summary: Researchers have successfully achieved a stable and high-rate sodium-metal battery by using a nonaqueous polyelectrolyte solution composed of poly(NaSTFSI) copolymerized with butyl acrylate. This solution exhibited high Na-ion transference number and ionic conductivity, and the modified Na electrode surface effectively suppressed the decomposition of the electrolyte.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Wenwen Zhang, Hiroki Muroyama, Yuichi Mikami, Qingshi Liu, Xiaojuan Liu, Toshiaki Matsui, Koichi Eguchi
Summary: A novel triple-conducting composite cathode for protonic ceramic fuel cells, BaCo0.7(Zr0.8Y0.2)0.3O3-delta (BCZY), is developed by replacing cerium with zirconium in BaCo0.7(Ce0.8Y0.2)0.3O3-delta (BCCY) to construct strongly interacting interfaces. BCZY exhibits superior oxygen reduction reaction (ORR) activity and stability, with a polarization resistance of 0.25 omega cm2 at 600 degrees C and excellent performance maintained for 206 hours. The enhanced ORR activity and stability are attributed to the high concentration of active sites and the strong hydration capability at strongly interacting interfaces of Co-rich and Zr-rich phases introduced by interdiffusion of Co and Zr.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Rheumatology
Yoshia Miyawaki, Ken-Ei Sada, Kenta Shidahara, Shoichi Nawachi, Yosuke Asano, Yu Katayama, Keigo Hayashi, Eri Katsuyama, Takayuki Katsuyama, Mariko Takano-Narazaki, Yoshinori Matsumoto, Nao Oguro, Nobuyuki Yajima, Yuichi Ishikawa, Natsuki Sakurai, Chiharu Hidekawa, Ryusuke Yoshimi, Takanori Ichikawa, Dai Kishida, Yasuhiro Shimojima, Jun Wada, Noriaki Kurita
Summary: This study aimed to examine the associations between grit and self-reported burnout components among academic rheumatologists. The findings showed that higher grit was associated with higher professional efficacy but not with exhaustion or cynicism. To prevent burnout among staff, supervisors who manage academic rheumatologists should assess their staff's individual grit.
JCR-JOURNAL OF CLINICAL RHEUMATOLOGY
(2023)
Article
Electrochemistry
Yu Katayama
Summary: The quest to design active and stable electrochemical interface relies on identifying the active site(s) and reaction mechanism. This comprehensive paper summarizes the latest understanding of the electrochemical interface during energy conversion and storage reactions, using operando spectroscopy and synchrotron scattering techniques. The study reveals that the complex interactions in the electrochemical interface can impact the reaction energetics and kinetics. This work highlights the importance of advanced research techniques in accelerating the design of electrochemical interfaces and improving electrocatalytic activity for energy conversion and storage reactions.
Article
Electrochemistry
Shinji Naruse, Hiroki Muroyama, Toshiaki Matsui, Koichi Eguchi
Summary: This study investigates the application of the heteropolyanion of [PW12O40]3- as an anode redox mediator in redox flow polymer electrolyte fuel cells (PEFCs). A novel reduction method using the corrosion reaction of metals in strong acid aqueous solutions is explored. The results show that aluminum is the most effective metal for reducing oxidized heteropolyanions, while cobalt has lower fuel efficiency.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Mikihiro Takahashi, Hayato Hesaka, Hiromori Tsutsumi, Yu Katayama
Summary: Novel electrolyte systems are developed using lithium-monochelated borates with trifluoromethylated ligands and a lithium bis(oxalato)borate (LiBOB) additive. The addition of LiBOB effectively suppresses capacity decay and high resistance in lithium-ion batteries, attributed to the formation of a solid electrolyte interphase (SEI) at the negative electrode, which suppresses the crosstalk of decomposition species and reduces the resistance increase at the positive electrode. This study provides a reliable approach for designing high-performance electrolytes and highlights the importance of considering reactions at both electrodes for battery performance improvement.
Article
Chemistry, Physical
Toshiaki Matsui, Takashi Ozeki, Kazunari Miyazaki, Sadahiro Nagasaka, Hiroki Muroyama, Kenichi Imagawa, Yoshimi Okada, Koichi Eguchi
Summary: This study demonstrates the development of novel proton conductors that can operate at intermediate temperatures, especially 300-400°C, through a simple ion-exchange method. The electrical conductivity of the developed conductor was evaluated at different temperatures and its main charge carrier was identified as a proton. These findings open up the possibility of realizing new electrochemical devices that can operate at 200-400°C.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Shinji Naruse, Hiroki Muroyama, Toshiaki Matsui, Koichi Eguchi
Summary: This study semi-quantitatively determined the constituent amounts of PMA redox species using 31P NMR measurements, and found that the redox component of heteropolyanions has an impact on the performance of redox flow PEFCs.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Applied
Wenwen Zhang, Hiroki Muroyama, Yuichi Mikami, Toshiaki Matsui, Koichi Eguchi
Summary: This study reports the surface manipulation of a triple-conducting cathode to enhance the oxygen reduction reaction (ORR) activity and CO2 tolerance in protonic ceramic fuel cells (PCFCs). The addition of an efficient catalyst coating significantly improves the ORR activity and reduces the polarization resistance of the cathode, while maintaining CO2 tolerance.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Chemistry, Physical
Sergey Yu. Ketkov, Sheng-Yuan Tzeng, Elena A. Rychagova, Anton N. Lukoyanov, Wen-Bih Tzeng
Summary: Metallocenes, including methylcobaltocene, play important roles in various fields of chemistry. The ionization energy and vibrational structure of (Cp ')(Cp)Co can be influenced by introducing methyl substituents. The mass-analyzed threshold ionization spectrum and DFT calculations provide accurate information about the properties and transformations of (Cp ')(Cp)Co.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Review
Chemistry, Physical
Qifeng Mu, Jian Hu
Summary: Polymer mechanochemistry has experienced a renaissance due to the rapid development of mechanophores and principles governing mechanochemical transduction or material strengthening. It has not only provided fundamental guidelines for converting mechanical energy into chemical output, but also found applications in engineering and smart devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Da Hye Yang, Francesco Ricci, Fredrik L. Nordstrom, Na Li
Summary: Through systematic evaluation of the oiling-out behavior of procaine, we identified both stable and metastable liquid-liquid phase separation, and established phase diagrams to assist in rational selection of crystallization strategies.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Vikki Anand Varma, Simmie Jaglan, Mohd Yasir Khan, Sujin B. Babu
Summary: Designing engineering structures like nanocages, shells, and containers through self-assembly of colloids is a challenging problem. This work proposes a simple model for the subunit, which leads to the formation of monodispersed spherical cages or containers. The model with only one control parameter can be used to design cages with the desired radius.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Hainan Jiang, Yaolong He, Xiaolin Li, Zhiyao Jin, Huijie Yu, Dawei Li
Summary: The cycling lifespan and coulombic efficiency of lithium-ion batteries are crucial for high C-rate applications. The Li-ion concentration plays a crucial role in determining the mechanical integrity and structural stability of electrodes. This study focuses on graphite as the working electrode and establishes an experimental system to investigate the mechanical properties of composite graphite electrode at different C-rates. Considering the effect of Li-ion concentration in stress analysis is found to be significant.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Zhiye Wang, Yunchuan Li, Mingjun Sun
Summary: This study investigates the influence of intramolecular pi-pi interactions on the electronic transport capabilities of molecules. By designing and analyzing three pi-conjugated molecules, the researchers observe that different pi-conjugated structures have varying effects on electron transport. The findings provide a theoretical foundation for designing single-molecule electronic devices with multiple electron channels based on intramolecular pi-pi interactions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Yuandong Xu, Haoyang Feng, Chaoyang Dong, Yuqing Yang, Meng Zhou, Yajun Wei, Hui Guo, Yaqing Wei, Jishan Su, Yingying Ben, Xia Zhang
Summary: Hollow MoS2 cubes and spheres were successfully synthesized using a one-step hydrothermal method with the hard template method. The hollow MoS2 cubes exhibited higher specific capacitance and energy density compared to the hollow MoS2 spheres. The symmetrical supercapacitors assembled with these hollow structures showed good performance and high capacity retention after multiple cycles. These findings suggest that controlling the pore structure and surface characteristics of MoS2 is crucial for enhancing its electrochemical properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Ainhoa Oliden-Sanchez, Rebeca Sola-Llano, Joaquin Perez-Pariente, Luis Gomez-Hortiguela, Virginia Martinez-Martinez
Summary: The combination of photoactive molecules and inorganic structures is important for the development of advanced materials in optics. In this study, bulky dyes were successfully encapsulated in a zeolitic framework, resulting in emission throughout the visible spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Miaomiao Zhang, Cunyuan Pei, Qiqi Xiang, Lintao Liu, Zhongxu Dai, Huijuan Ma, Shibing Ni
Summary: The design of a solid electrolyte interphase (SEI) plays a crucial role in improving the electrochemical performance of anode materials. In this study, lithium difluoro(oxalate)borate (LiDFOB) is used as an electrolyte additive to form a protective SEI film on Li3VO4 (LVO) anodes. The addition of LiDFOB results in a dense, uniform, stable, and LiF-richer SEI, which enhances the Li-ion storage kinetics. The generated SEI also prevents further decomposition of the electrolyte and maintains the morphology of LVO anodes during charge/discharge processes. This work demonstrates the effectiveness of LiDFOB as a multi-functional additive for LiPF6 electrolytes and provides insights into SEI construction for high-performance LVO anodes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
B. V. Andryushechkin, T. V. Pavlova, V. M. Shevlyuga
Summary: The atomic structure of the Ag(111)-p(4 x 4)-O phase was reexamined and two phases with the same periodicity were discovered. It was demonstrated that the accepted Ag6 model is incompatible with high-resolution oxygen-sensitive STM images.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
S. L. Romo-Avila, D. Marquez-Ruiz, R. A. Guirado-Lopez
Summary: In this study, we used density functional theory (DFT) calculations to investigate the interaction between model graphene oxide (GO) nanostructures and chlorine monoxide ClO. We aimed to understand the role of this highly oxidizing species in breaking C-C bonds and forming significant holes on GO sheets. Our results showed that C-C bonds in a single graphene oxide sheet can be broken through a simple mechanism involving the dissociation of two chemically attached ClO molecules. The formation of carbonyl groups and holes on the GO surface was also observed. This study provides important insights into the degradation of carbon nanotubes and the stability of GO during the myeloperoxidase (MPO) catalytic cycle.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Alberto Garcia-Fernandez, Birgit Kammlander, Stefania Riva, Hakan Rensmo, Ute B. Cappel
Summary: In this study, the X-ray stability of five different lead halide perovskite compositions (MAPbI3, MAPbCl3, MAPbBr3, FAPbBr3, CsPbBr3) was investigated using photoelectron spectroscopy. Different degradation mechanisms and resistance to X-ray were observed depending on the crystal composition. Overall, perovskite compositions based on the MA+ cation were found to be less stable than those based on FA+ or Cs+. Metallic lead formation was most easily observed in the chloride perovskite, followed by bromide, and very little in MAPbI3. Multiple degradation processes were identified for the bromide compositions, including ion migration, formation of volatile and solid products, as well as metallic lead. CsBr was formed as a solid degradation product on the surface of CsPbBr3.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Timofei Rostilov, Vadim Ziborov, Alexander Dolgoborodov, Mikhail Kuskov
Summary: The shock-loading behavior of nanomaterials is investigated in this study. It is found that shock compaction waves exhibit a distinct two-step structure, with the formation of faster precursor waves that travel ahead of the main compaction waves. The complexity of the shock Hugoniot curve of the tested nanomaterial is described, and the effect of initial porosity on the compressed states is demonstrated.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Sergey S. Nikitin, Alexander D. Koryakov, Elizaveta A. Antipinskaya, Alexey A. Markov, Mikhail V. Patrakeev
Summary: The stability of La1/3Sr2/3Fe1-xMnxO3-delta, a perovskite-type oxide, under reducing conditions is dependent on the manganese content. Increasing the manganese content leads to a decrease in stability. The behavior of iron and manganese in the oxide shows distinct differences, which can be attributed to the difference in the enthalpy of oxidation reactions. Additionally, the change in the La/Sr ratio affects the concentration of iron and manganese ions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Mosayeb Naseri, Shirin Amirian, Mehrdad Faraji, Mohammad Abdur Rashid, Maicon Pierre Lourenco, Venkataraman Thangadurai, D. R. Salahub
Summary: Inspired by the successful transfer of freestanding ultrathin films of SrTiO3 and BiFeO3, this study assessed the structural stability and investigated the electronic, optical, and thermoelectric properties of a group of two-dimensional perovskite-type materials called perovskenes. The findings revealed that these materials are wide bandgap semiconductors with potential application in UV shielding. Moreover, they exhibit better electrical and thermal conductivity at high temperatures, enabling efficient power generation in thermoelectric devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
