Article
Nanoscience & Nanotechnology
Ruiyun Huang, Connor G. Carr, Chirranjeevi Balaji Gopal, Sossina M. Haile
Summary: In this study, a general electrochemical method for determining nonstoichiometry in thin film MIECs was demonstrated via measurement of the chemical capacitance. Impedance spectra measurements were conducted on ceria and ceria-zirconia materials under different oxygen partial pressures and temperatures. The results showed that nonstoichiometry values can be accurately determined from the chemical capacitance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Inorganic & Nuclear
Yasuaki Matsuda, Naoya Ueda, Kousei Funakoshi, Jun Nakajima, Daisuke Mori, Sou Taminato, Shinya Higashimoto
Summary: Proton solid electrolytes with high proton conductivity at a wide range of low-intermediate temperatures are essential for the development of fuel cells. In this study, a new benitoite-type polyphosphate, KMg1-xH2x(PO3)·yH2O, was investigated as a promising proton conductor. The proton conductivity increased with the parameter x until impurity phase was detected at x=0.125, showing potential for practical applications.
DALTON TRANSACTIONS
(2021)
Article
Electrochemistry
K. Darowicki, A. Zielinski, M. Mielniczek, E. Janicka, L. Gawel
Summary: This paper presents a polynomial description of spectrograms obtained using Dynamic Electrochemical Impedance Spectroscopy, with an alternative analysis method discussed for determining system electrochemical characteristics. This method was compared to classical analysis based on equivalent circuit fitting, showing advantages in describing impedance results and controlling electrochemical energy sources.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Youxiong Ye, Andrew B. Hamlin, Julia E. Huddy, Md Saifur Rahman, William J. Scheideler
Summary: This article presents a new method of printing transparent conductive oxides using 2D conducting metal oxides, which offers unprecedented control of thin film electrostatics at the nanoscale. The use of repeating heterostructures of these 2D oxide layers allows for a significant increase in conductivity and optical transmittance. This innovative approach surpasses traditional sol-gel and nanoparticle printing methods and enables the rapid fabrication of flexible inorganic electronics.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Siew Ting Melissa Tan, Aristide Gumyusenge, Tyler James Quill, Garrett Swain LeCroy, Giorgio Ernesto Bonacchini, Ilaria Denti, Alberto Salleo
Summary: Organic mixed ionic-electronic conductors (OMIECs) have gained interest due to their multifunctionality and responsiveness to stimuli. By modulating their charge states and properties, OMIECs can exhibit exciting new characteristics and provide new degrees of freedom in device design. The application of the organic synthetic toolbox offers various chemical and structural design approaches to modify OMIECs' properties.
ADVANCED MATERIALS
(2022)
Article
Physics, Applied
B. N. R. Lap, A. Khudchenko, R. Hesper, K. I. Rudakov, P. Dmitriev, F. Khan, V. P. Koshelets, A. M. Baryshev
Summary: By using a terahertz dispersive Fourier transform spectrometer to study the frequency properties of superconducting films, the quality of the films at terahertz frequencies can be characterized. Experimental results show that the strong-coupling coefficient varies for Nb and NbTiN films, with good agreement with the theoretical model.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Cong Liu, Chunshao Mo, Linfeng Zhong, Xiaoqi Gong, Yang Zhang, Xiaotong Wang, Fan Yang, Jing Li, Jiang Lu, Dingshan Yu
Summary: A new octupolar cyano-vinylene-linked 2D polymer framework has been developed using ethoxylation chemistry, exhibiting efficient electron/ion conductance and catalytic activity for sulfur evolution. This new material can be used as a separator modifier in Li-S cells, improving the overall electrochemical performance.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Kateryna Shevchuk, Asia Sarycheva, Christopher E. Shuck, Yury Gogotsi
Summary: This study is the first systematic experimental Raman spectroscopy investigation of the MXene family. By exploring the vibrational spectra of MXenes with different structures and compositions, it provides the potential for fingerprinting and in situ studies of MXenes.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Amar Bendieb Aberkane, Maria Pilar Yeste, Faycal Djazi, Miguel Angel Cauqui
Summary: In this study, a series of NiO-CeO2 mixed-oxide catalysts were prepared using a modified co-precipitation method. The influence of the preparation method and pH value on the properties of the catalysts were investigated. The catalyst prepared at a higher pH value exhibited better performance in the CO methanation reaction.
Article
Physics, Applied
Jeonghun Suh, Ji Soo Lim, Heung-Sik Park, Chan-Ho Yang
Summary: By studying Ca 30%-doped bismuth ferrite thin films epitaxially grown on SrTiO3 (110) substrates, complementary relationships between two methods for oxygen vacancy transport were identified, revealing the collective phase evolution and ionic impedance in the bulk, grain boundary, and interfacial regions for ion defect conduction in oxides.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Dong-Sheng Shao, Wan-Wan Yao, Jin Zhang, Yin Qian, Xiao-Ming Ren
Summary: A series of isomorphic salts were prepared and characterized in this study. The thermal stabilities of the salts were found to increase with decreasing cell volume. Furthermore, the spin-Peierls transition observed in the parent salt disappeared upon doping with a nonmagnetic impurity.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Inorganic & Nuclear
Hadi Hachem, HengBo Cui, Reizo Kato, Pere Alemany, Enric Canadell, Olivier Jeannin, Marc Fourmigue, Dominique Lorcy
Summary: Highly conducting, mixed-valence, multi-component nickel bis-(diselenolene) salts were obtained by electrocrystallization. Depending on the counter ion used, the salts showed different stoichiometries of 1:2 and 1:3. This is a rare example of mixed-valence conducting salts of nickel diselenolene complexes, which usually form single component neutral species. The transport measurements under high pressure and band structure calculations confirmed the semiconducting and quasi metallic characters of the salts.
INORGANIC CHEMISTRY
(2023)
Article
Physics, Multidisciplinary
Brahim Marfoua, Jisang Hong
Summary: This study investigates the effects of an electric field on anomalous Hall conductivity (AHC) and valley polarization in a 2D WSe2/1T-VSe2 heterostructure, with findings indicating the possibility of electric field-induced AHC switching. The research demonstrates the tunability of AHC and valley polarization in the heterostructure under the influence of external factors, suggesting potential applications in spin-driven electronics.
COMMUNICATIONS PHYSICS
(2022)
Letter
Materials Science, Multidisciplinary
Yabei Xia, Linyang Li, Haihui Lan, Yuxin Ma, Feifei Cao, Yu Ding, Luyang Wang, Xiaofei Zhu, Mengqi Zeng, Lei Fu
Summary: Multicolor luminescence in two-dimensional (2D) materials is challenging to achieve due to their atomic thickness and structural sensitivity. However, in this study, a 2D inorganic framework with wide bandgap and easily substitutable sites was designed to embed self-transforming luminescence centers, leading to multicolor emissions ranging from green to orange. These findings present a new paradigm for designing 2D multicolor luminescent materials and offer potential applications in various fields.
ACS MATERIALS LETTERS
(2023)
Article
Multidisciplinary Sciences
Peter Serles, Taib Arif, Anand B. Puthirath, Shwetank Yadav, Guorui Wang, Teng Cui, Aravind Puthirath Balan, Thakur Prasad Yadav, Prasankumar Thibeorchews, Nithya Chakingal, Gelu Costin, Chandra Veer Singh, Pulickel M. Ajayan, Tobin Filleter
Summary: Two-dimensional materials are known for their low-friction interfaces, with van der Waals bonding being a major factor. However, nanoscale and quantum confinement effects can also play a role in modifying the atomic interactions of 2D materials, resulting in unique interfacial properties. Magnetene, a non-vdW 2D material obtained through the exfoliation of magnetite, demonstrates low-friction behavior similar to benchmark vdW 2D materials due to 2D confinement effects that minimize potential energy surface corrugation, reduce surface adsorbates, and restrict low-damping phonon modes.
Article
Electrochemistry
Baptiste Py, Adeleke Maradesa, Francesco Ciucci
Summary: Electrochemical impedance spectroscopy (EIS) is a widely used technique for studying electrochemical systems, but it has several limitations: noisy data, non-unique equivalent circuits, and suboptimal frequency placement. This study introduces a Gaussian-process-based, active-learning framework to optimize EIS frequency selection for accurate and efficient measurements. It explores the use of Gaussian processes for EIS experiment optimization.
ELECTROCHIMICA ACTA
(2023)
Article
Electrochemistry
Emanuele Quattrocchi, Baptiste Py, Adeleke Maradesa, Quentin Meyer, Chuan Zhao, Francesco Ciucci
Summary: Electrochemical impedance spectroscopy (EIS) is widely used to analyze electrochemical systems. The distribution of relaxation times (DRT) has emerged as a powerful alternative to traditional EIS analysis methods. This study focuses on developing a deep neural network-based approach to estimate the DRT accurately and efficiently. The proposed framework outperforms ridge regression and is validated with various EIS spectra, showing great potential for the analysis of EIS data.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Alessandro Manzotti, Matthew J. Robson, Francesco Ciucci
Summary: Membraneless electrolyzers (MEs) are an exciting emerging technology for efficient hydrogen production, chemical production, and carbon capture. Unlike conventional electrolyzers, which employ an ion-conducting, impermeable membrane between the electrodes to separate product gases, MEs achieve gas separation with fluid-dynamic forces. This work presents a concise review, characterization, and comparison of the emerging ME architectures, and provides guidance for future research in the field.
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2023)
Article
Thermodynamics
Yifang Dong, Yingying Yu, Adnan Ibrahim, Xuegong Hu, Yong Hao
Summary: ORMS has been extensively studied in pool boiling heat transfer due to its lower cost of fabrication, ease of application and better heat transfer performance. Liquid height effect on heat transfer performance for ORMS has been investigated in this study, where different liquid heights were tested and compared with CPS. The results showed different variations of heat transfer coefficient with liquid height for ORMS, while CPS did not exhibit the same trend.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Physical
Ziling Wang, Caichen Yang, Jian Pu, Yunfeng Tian, Jian Wang, Francesco Ciucci, Bo Chi
Summary: Morphology regulation is an effective way to improve the electrocatalytic activity of SOFC cathodes, and nanofibers have been confirmed to have advantages in this aspect. This study employed a sintering-free method to in-situ self-assemble LCaFN nanofibers onto the YSZ electrolyte surface, which showed impressive performance compared to previous work. These findings demonstrate the promising strategy of combining fiber cathodes and in-situ self-assembly techniques for high-performance SOFCs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Yunfeng Tian, Alessandro Manzotti, Yuhao Wang, Yufei Song, Xian-Zhu Fu, Bo Chi, Francesco Ciucci
Summary: Replacing fossil fuels with renewable energy sources is crucial for addressing global warming. However, the intermittent nature of solar and wind energy poses a significant challenge for widespread use. Power-to-X, which uses solid oxide electrolysis cells to produce chemicals from electricity, offers a flexible and efficient solution for energy storage. This Perspective provides an overview of the characteristics, capabilities, and mechanisms of solid oxide electrolysis cells, and discusses the latest research progress and future prospects and challenges in this field.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Electrochemistry
Adeleke Maradesa, Baptiste Py, Ting Hei Wan, Mohammed B. B. Effat, Francesco Ciucci
Summary: Electrochemical impedance spectroscopy (EIS) is widely used in electrochemistry, and obtaining EIS data is easy with modern electrochemical workstations. However, analyzing EIS spectra remains a significant challenge. The distribution of relaxation times (DRT) has emerged as a solution, but DRT deconvolution is an ill-posed optimization problem. This article investigates the selection of regularization level lambda using cross-validation methods and the L-curve approach, as well as explores a hierarchical Bayesian DRT deconvolution method.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Jing Yu, Guodong Zhou, Yueqing Li, Yuhao Wang, Dengjie Chen, Francesco Ciucci
Summary: A highly conductive and stable composite electrolyte is developed for high-energy-density Li-metal batteries, showing excellent cycling performance and rate capability at room temperature. The electrolyte has a high ionic conductivity and stability with Li metal, and significantly lowers contact resistance with electrodes.
Review
Chemistry, Physical
Siyuan Wang, Miao Wang, Yunze Zhang, Hongsheng Wang, Hao Fei, Ruoqi Liu, Hui Kong, Ruijie Gao, Siyuan Zhao, Tong Liu, Yuhao Wang, Meng Ni, Francesco Ciucci, Jian Wang
Summary: The sluggish kinetics of the oxygen reduction reaction (ORR) limits the large-scale application of electrochemical energy devices. Metal oxide-supported metal catalysts (MOSMCs) are gaining interest due to their unique electronic configuration and corrosion resistance. MOSMCs can be modulated by engineering the metal oxide substrate and supported metal. This review comprehensively discusses the characterization, modulation strategies, and status of MOSMCs for ORR, and promotes rational design for electrochemical energy devices.
Review
Chemistry, Physical
Yuhao Wang, Jiapeng Liu, Yufei Song, Jing Yu, Yunfeng Tian, Matthew James Robson, Jian Wang, Zhiqi Zhang, Xidong Lin, Guodong Zhou, Zheng Wang, Longyun Shen, Hailei Zhao, Salvatore Grasso, Francesco Ciucci
Summary: Perovskites have shown great potential in energy conversion and storage technologies. High-entropy perovskites (HEPs) have emerged as a new type of perovskite framework due to their excellent stability and performance. This work reviews the recent progress in HEPs, including synthesis methods and applications, and explores effective strategies for their design through atomistic computations. The outlook of this field provides guidance for the development of new and improved HEPs.
Article
Chemistry, Physical
Mingzhuang Liang, Yuhao Wang, Yufei Song, Daqin Guan, Jie Wu, Peng Chen, Adeleke Maradesa, Meigui Xu, Guangming Yang, Wei Zhou, Wei Wang, Ran Ran, Francesco Ciucci, Zongping Sha
Summary: A nanocomposite material BCFZYN, consisting of a major perovskite phase and a minor NiO phase, has been found to possess excellent oxygen reduction/evolution reaction activities. The material shows accelerated oxygen desorption and proton conduction, making it a promising air electrode material for reversible protonic ceramic cells.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Materials Science, Multidisciplinary
Quan-Li Shen, Long-Yun Shen, Le-Yi Chen, Lu-Bing Qin, Yong-Gang Liu, Nicholas M. Bedford, Francesco Ciucci, Zheng-Hua Tang
Summary: A systematic study is reported to examine the enhanced oxygen evolution reaction (OER) performance of NiFe layered double hydroxides (NiFe-LDHs) by loading atom-precise all alkynyl-protected [Au-28((BuC)-Bu-t equivalent to C)(17)](-) nanoclusters on their surface. The loaded Au nanoclusters exhibit a significantly lower overpotential and Tafel slope compared to thiolate-protected Au-28(TBBT)(20) nanoclusters, indicating improved electrocatalytic activity. This enhanced performance is attributed to the interfaces created between NiFe-LDHs and Au nanoclusters, leading to more significant charge transfer and a lower energy barrier for the potential-determining step in the OER process.
Article
Chemistry, Physical
Longyun Shen, Yuhao Wang, Jing Yu, Guodong Zhou, Jiapeng Liu, Matthew J. Robson, Yanguang Zhou, Mohammed B. Effat, Francesco Ciucci
Summary: Li2OHCl is a promising solid-state electrolyte for all-solid-state Li-ion batteries. Strain engineering, achieved through isovalent doping, can improve Li+ conductivity and stabilize the highly conductive cubic phase at room temperature. By introducing tensile strain, Li2OHCl0.921I0.079 achieves a significantly higher ionic conductivity and demonstrates enhanced battery performance compared to Li2OHCl.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Zilong Wang, Yuhao Wang, Longyun Shen, Zhaoqing Jin, Ho Mei Law, Anbang Wang, Weikun Wang, Francesco Ciucci
Summary: By using a new nitrate-based additive TEGDN, the incompatibility between poly-DOL and LiNO3 has been successfully resolved, leading to the development of in situ polymerized quasi-solid-state lithium-metal batteries. The resulting electrolyte exhibits high ionic conductivity and oxidation stability, demonstrating excellent cycling performance and capacity retention in experimental tests.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Zhenyu Tian, Kai Zhao, Yidian Zhang, Lingzhi Yang, Yu Shao, Yong Hao
Summary: The photovoltaic-thermochemical (PVTC) hybrid system improves solar power efficiency and dispatchability through the complementation of concentrated solar PV and solar thermochemical conversions. However, the high concentration ratio in the PVTC system presents challenges to temperature uniformity and energy conversion performance. By analyzing the heat transfer and reaction performance of four different compact reactors for methanol steam reforming, it was found that the reactor structure has a significant influence on these factors. The optimal net solar-electric efficiency of the PVTC system with the six-chamber reactor is 42.2%, higher than the previous study at the same operating temperature.
SUSTAINABLE ENERGY & FUELS
(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)
