Article
Chemistry, Multidisciplinary
Yang Lu, Zhan-She Guo, Shang-Chun Fan
Summary: This study utilized a graphene beam to create a graphene resonant gyroscope structure with high sensitivity and direct frequency output. Simulation results indicated that the resonant frequency of the graphene resonant beam decreased with increasing length and thickness, while width had minimal effect. The designed gyroscope had a fundamental frequency exceeding 20 MHz and angular velocity sensitivity up to 22,990 Hz/degrees/hour, making it suitable for applications requiring high sensitivity to weak angular velocity variations.
Article
Chemistry, Multidisciplinary
Jiaman Liu, Lei Jin, Frances Allen, Yang Gao, Penghong Ci, Feiyu Kang, Junqiao Wu
Summary: This study introduces atomic-scale defects into bilayer graphene through helium ion irradiation and hydrogen plasma treatment, achieving high permeability and selectivity in membranes for gas separation. The method provides a new approach for gas separation with potential applications in hydrogen purification and recovery.
Article
Nanoscience & Nanotechnology
Ronggui Zhu, Lingran Yu, Xujie Ma, Qixun Guo, Xiulan Xu, Chenchen Shi, Fei Meng, Baohe Li, Guanghua Yu, Chun Feng
Summary: This study demonstrates a different strategy to enhance the anisotropic magnetoresistance (AMR) effect by tuning the orbital degree of freedom. By inserting an oxygen-affinitive Hf layer into a multilayer film and modulating the Fe-O orbital hybridization at the MgO/NiFe interface, the researchers were able to increase the number of holes in the in-plane symmetric d orbits of Fe, leading to an enhanced AMR ratio. By further micromachining, they constructed a magnetic sensor with high sensitivity and low noise detectability.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Raul D. Rodriguez, Maxim Fatkullin, Aura Garcia, Ilia Petrov, Andrey Averkiev, Anna Lipovka, Liliang Lu, Sergey Shchadenko, Ranran Wang, Jing Sun, Qiu Li, Xin Jia, Chong Cheng, Olfa Kanoun, Evgeniya Sheremet
Summary: In this study, a conductive and resilient nanocomposite between glass and graphene was successfully achieved using a single-step laser-induced backward transfer method. This method not only integrates graphene into glass, but also drives chemical transformations in glass and produces the highest-quality laser-reduced graphene oxide reported to date. The resulting nanocomposite was further functionalized with silver to create a highly sensitive dual-channel plasmonic optical and electrochemical sensor.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jiheng Ding, Hongran Zhao, Haibin Yu
Summary: In this study, a bio-inspired multilayered graphene-epoxy composite coating was fabricated using a scalable spraying approach. The composite coating exhibited good dispersity and structure repair capabilities, forming interlock structures to improve coating resistance. It also showed highly anisotropic thermal and electrical conductivities and the ability to self-monitor structural safety and health.
Article
Nanoscience & Nanotechnology
Xin-Hua Zhao, Qin-Teng Lai, Wen-Tao Guo, Zhan-Heng Liang, Zhenhua Tang, Xin-Gui Tang, Vellaisamy A. L. Roy, Qi-Jun Sun
Summary: This study demonstrates a method to fabricate a flexible tactile sensor with high sensitivity, high resolution, and a wide pressure detection range. The sensor consists of two layers of microstructured flexible electrodes with high modulus and conductive cotton fabric with low modulus. It shows high sensitivity, fast response speed, and excellent durability. The fabrication of a tactile sensor array also shows potential in electronic skin applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Thermodynamics
Vijayasree Haridas, A. Sukhananazerin, Biji Pullithadathil, Binitha N. Narayanan
Summary: This study demonstrates the preparation of α-Fe2O3/graphene nanocomposite with excellent supercapacitor performance, high conductivity, and ultrahigh specific capacitance values. The composite shows good cyclic stability with a significant increase in specific capacitance compared to α-Fe2O3 and graphene.
Article
Nanoscience & Nanotechnology
Woochang Kim, Wonseok Lee, Seung-Mo Lee, Duckjong Kim, Jinsung Park
Summary: This study proposes a method of improving the thermoelectric properties of graphene through defect engineering using plasma irradiation and atomic layer deposition (ALD). The results show that intentionally created atomic blemishes in graphene can be healed using Pt-ALD treatment, resulting in a significant increase in electrical conductivity and the square of the Seebeck coefficient. The thermoelectric figure of merit of the Pt-ALD treated graphene is measured to be over 4.8 times higher than reported in the literature.
Article
Chemistry, Multidisciplinary
Liyang Lin, Susu Chen, Tao Deng, Wen Zeng
Summary: A universal synthesis method was developed to prepare oxygen-deficient SnO2 hollow nanospheres/graphene nanocomposite with excellent performance, showing promising potential for high-performance energy storage devices and gas sensors.
Article
Engineering, Environmental
Chengcheng Wang, Xiaodan Gong, Jiashuang Li, Yuhua Chen, Bingzhen Li, Liping Zhang, Shaohai Fu
Summary: The newly designed fluorane dyes exhibit ultrahigh sensitivity, excellent thermochromic properties, narrow color-change temperature range, and ultralow color hysteresis. Optimized microcapsules show improved overall performance.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Yachu Zhang, Han Lin, Fei Meng, Huai Liu, David Mesa, Huihui Zhang, Xiaodong Huang, Alan Kin Tak Lau, Yuejin Zhao, Tianyi Ma, Baohua Jia
Summary: The study introduces a graphene sensor with a micro-cliff design that achieves a record high sensitivity within a broad working range. This sensor has a fast response time, minimal hysteresis, and outstanding cycling stability, meeting the requirements of an ideal pressure sensor.
Article
Engineering, Electrical & Electronic
Tong Xing, Enbo Xing, Tao Jia, Jianglong Li, Jiamin Rong, Yanru Zhou, Wenyao Liu, Jun Tang, Jun Liu
Summary: Whispering gallery mode (WGM) crystalline resonator achieves fast switching, ultrahigh sensitivity, and wide dynamic response range by locking modes with different Q values.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Su-Ho Jung, Young-Min Seo, Taejun Gu, Wonseok Jang, Seog-Gyun Kang, Yuhwan Hyeon, Sang-Hwa Hyun, Jae-Hyun Lee, Dongmok Whang
Summary: A novel Gr-ISFET pH sensor based on proton-permeable defect-engineered graphene was fabricated, which showed a super-Nernstian pH response (approximately -140 mV/pH) under optimized conditions by adjusting the grain boundary density of graphene and the functional group on the SiO2 surface.
Article
Chemistry, Multidisciplinary
Shen Ao, Mingda Liu, Dexin Wang, Encheng Zhu, Kai Liu, Weipeng Wang, Yunhan Ling, Wangyang Fu, Zhengjun Zhang
Summary: Graphene's properties make it an ideal material for detecting hazardous gases. However, traditional detection methods have limited selectivity. In this study, we use a lock-in technique to measure both conductance and dielectric modulations in graphene chips, resulting in enhanced selectivity and sensing response compared to conventional methods that rely solely on conductance measurements.
CELL REPORTS PHYSICAL SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Yuri Sakamoto, Takashi Ikuta, Kenzo Maehashi
Summary: This study proposes a method to electrically detect chemical reactions on graphene surfaces, achieving highly sensitive detection. Through the thiol-ene reaction, bond changes were successfully detected on graphene surfaces.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Won-Gwang Lim, Cheol-Young Park, Hyeonjung Jung, Seoa Kim, Seok Hun Kang, Young-Gi Lee, Yo Chan Jeong, Seung Bo Yang, Kwonnam Sohn, Jeong Woo Han, Jinwoo Lee
Summary: This study reports an advanced cathode composed of highly active Fe single-atom catalysts (SACs) to achieve high-energy and long cycle lithium-sulfur (Li-S) pouch cells with low electrolyte/sulfur (E/S), electrolyte/capacity (E/C), and negative/positive (N/P) ratios and high sulfur loadings. The Fe SACs are designed with electron-exchangeable binding (EEB) sites, which consist of two types of S species (thiophene-like-S and oxidized-S) adjacent to the Fe SACs. These EEB sites promote the kinetics of the Li2S redox reaction by providing additional binding sites and modulating the Fe d-orbital levels.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ying Wang, Ara Cho, Guangri Jia, Xiaoqiang Cui, Junhyeop Shin, Inho Nam, Kyung-Jong Noh, Byoung Joon Park, Rui Huang, Jeong Woo Han
Summary: Single-atom nanozymes (SAzymes) show promise in next-generation nanozymes, but the rational modulation of their microenvironment with controllable multi-enzyme properties remains challenging. The relationship between atomic configuration and multi-enzymatic performances is systematically investigated in this study. Mn-SA-N-3-coordinated SAzymes (Mn-SA-N-3-C) demonstrate significantly higher oxidase, peroxidase, and glutathione oxidase-like activities compared to Mn-SA-N-4-C. The coordination number of single atomic Mn sites and local charge polarization play a crucial role in these multi-enzyme-like behaviors. These findings facilitate the atomic-level understanding of nanozymes' microenvironment and promote the rational design of other demanding biocatalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Environmental
Seunghyun Lee, Ye Eun Jeon, Seonggyu Lee, Wonhee Lee, Seongbeen Kim, Jaeryung Choi, Jinkyu Park, Jeong Woo Han, You Na Ko, Young Eun Kim, Jinwon Park, Jungbae Kim, Ki Tae Park, Jinwoo Lee
Summary: The introduction of a porous structure is an effective method to enhance the electrochemical reaction of catalysts. In this study, four types of porous Ni-N-C model catalysts were created to investigate the relationship between porous structures and catalytic performances in a membrane electrode assembly (MEA) based catholyte-free CO2 electrolyzer. The optimized mesoporous Ni-Nx catalyst exhibited the highest efficiency in MEAs, achieving industry-relevant performance for CO production with a state-of-the-art energy efficiency of 55% and excellent long-term stability in a full cell.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Wonmi Lee, Kyu In Shim, Gyunho Park, Jeong Woo Han, Yongchai Kwon
Summary: Instead of developing new organic active materials, a rationally designed composite supporting electrolyte is suggested to improve the performance of aqueous organic redox flow batteries (AORFBs). By optimizing the composite supporting electrolyte using density functional theory (DFT), the solubility and stability of the redox couple are improved, leading to higher capacity and excellent retention of AORFB.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Automation & Control Systems
Joseph Cenerini, Mohamed W. Mehrez, Jeong-woo Han, Soo Jeon, William Melek
Summary: In this paper, a model predictive path following control (MPFC) for holonomic mobile robots is proposed, which allows for time-varying path parameterization while maintaining closed-loop asymptotic stability. By verifying the cost-controllability assumption and deriving an upper bound of the MPFC value function, the length of a stabilizing prediction horizon is calculated. Theoretical results are validated through numerical simulations and implementations on a physical mobile robot.
CONTROL ENGINEERING PRACTICE
(2023)
Article
Chemistry, Physical
Jaeyoung Lee, Jiwoo Song, Hyeonjung Jung, Ilpyo Rho, Euiyoung Jung, Jeong Woo Han, Taekyung Yu
Summary: The advantage of a complex catalyst is that it can efficiently increase the overall reaction rate by increasing each sub-reaction rate. This study reports a facile method to mix two catalysts homogeneously at the nanoscale while maintaining their crystal structure intact. ZnNiCu hydroxide nanoplates with a mixed crystal structure were synthesized and showed high activity in photocatalytic hydrogen evolution reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Thangavel Kavinkumar, Heejae Yang, Amarnath Thangavel Sivagurunathan, Hayoung Jeong, Jeong Woo Han, Do-Heyoung Kim
Summary: A novel hybrid electrocatalyst with a coral-like iron nitride (Fe2N) arrays and tungsten nitride (W2N3) nanosheets as the architecture is introduced, satisfying the requirement of a favorable electronic configuration and a sufficient density of active sites at the interface. The resulting W2N3/Fe2N catalyst exhibits high oxygen and hydrogen evolution reaction (OER and HER) activities with good long-term durability in an alkaline medium. Density functional theory calculations show an upshift in the individual band centers of the hybrid structure, improving the OER and HER activities. This strategy provides a valuable guide for the fabrication of cost-effective multi-metallic crystalline hybrids as multifunctional electrocatalysts.
Article
Chemistry, Physical
Woonsuk Yeo, Dongjae Shin, Moon Hyeon Kim, Jeong Woo Han
Summary: Density functional theory calculations were performed to investigate the change in Hg oxidation reactivity caused by support tuning methods, and to elucidate the change in the electronic environment at the active site. The phase control to the TiO2 support was found to improve the Hg oxidation activity, while the reduction treatment decreased the activity due to the change in charge density at V2O5. Furthermore, the interaction between the V site and surface Cl was found to critically contribute to the change in Hg oxidation reactivity.
Article
Chemistry, Physical
Jihyeon Lee, Byung Gwan Park, Kiheon Sung, Hyeongeon Lee, Jihun Kim, Eonu Nam, Jeong Woo Han, Kwangjin An
Summary: This study investigates the reversible hydrogenation and dehydrogenation processes in a liquid organic hydrogen carrier (LOHC) system using a single-catalyst approach. Key hydrogen-involved catalytic behaviors, such as adsorption and migration, play crucial roles in reactivity. The findings demonstrate that employing a defective metal oxide support can facilitate these behaviors at the active sites on the catalyst surface during the LOHC process.
Article
Chemistry, Physical
Kyung-Jong Noh, Byoung Joon Park, Ying Wang, Yejung Choi, Sang-Hoon You, Yong-Tae Kim, Kug-Seung Lee, Jeong Woo Han
Summary: Copper sites coordinated with nitrogen-doped carbon (Cu-N-C) catalysts with atomically-dispersed edge-hosted Cu-N-4 sites (Cu-N4C8) showed excellent performance in electrochemical CO2 reduction reactions, achieving highly selective CO conversion. The micropore of the graphitic layer in Cu-N4C8 sites caused the Cu atom's d-orbital energy level to shift upward, leading to decreased occupancy of antibonding states in the *COOH binding and improved reaction efficiency.
Article
Chemistry, Multidisciplinary
Yongjian Ye, WonJun Lee, Junxian Pan, Xiang Sun, Mengzhen Zhou, Jiahui Li, Nian Zhang, Jeong Woo Han, Yan Chen
Summary: Surface engineering is an effective strategy to promote CO2/H2O co-electrolysis for CH4 production. The introduction of a thin CeO2 layer onto the Ni-BZCYYb fuel electrode surface significantly enhances CH4 selectivity. Advanced spectroscopic techniques and density functional theory calculations reveal that the decorated CeO2 modulates reactant adsorption and facilitates proton transfer, resulting in accelerated CH4 production. These findings provide critical insights for the rational design of high-performance catalysts in other high temperature electrochemical devices.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Jihyeon Song, Myeong Gon Jang, Kyung-Jong Noh, Yunkyung Kim, Jeong Woo Han
Summary: We enhanced the reactivity of Pt-loaded TiO2 catalysts for the water-gas shift reaction (WGSR) by inducing TiO2 support to form nanotubes and doping with vanadium. By conducting in situ DRIFTS, XPS, pulsed reaction, and isotopic exchange experiments, we studied the reaction mechanisms and factors contributing to the increased catalytic activity. The Pt-loaded V-doped tube-shaped TiO2 catalyst showed significantly improved WGSR activity, attributed to increased surface area, better dispersion of loaded metal, and H2O dissociation ability. This study highlights the potential of modified Pt-loaded TiO2 catalysts for WGSR process and the synergistic effect of TiO2 shape control and V-doping on catalytic activity, also providing a systematic mechanism study to elucidate the impact of active factors on catalysts.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Woonsuk Yeo, Dongjae Shin, Moon Hyeon Kim, Jeong Woo Han
Summary: Oxidation of elemental Hg (Hg-0) is an efficient method to remove harmful Hg from coal combustion flue gas, and the development of a highly active V2O5/TiO2 catalyst is essential. Density functional theory calculations were used to investigate the effects of support tuning methods on Hg oxidation activity and electronic environment at the active site. Phase control improved activity, while reduction treatment decreased activity due to the change of charge density at V2O5.
Article
Chemistry, Physical
Selvaraj Seenivasan, Hyeonae Im, Taewaen Lim, Jeong Woo Han, Junhyeok Seo
Summary: This study discovers that a classical Schottky junction electrode can eliminate the non-conductive lamination of poor conductive catalysts, enhancing the activity of water splitting reactions. Specifically, the experiments demonstrate that a Schottky junction electrode formed by a nickel-tungsten nitride alloy and NiFeOOH can achieve high current densities at overpotentials of 11 mV and 181 mV, respectively.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Applied
Seokhyun Choung, Heejae Yang, Jinuk Moon, Wongyu Park, Hyeokjoon June, Chaesung Lim, Jeong Woo Han
Summary: This study investigates how the local coordination of metal in metal-nitrogen doped carbon catalysts affects the activity and selectivity of the chlorine-evolution reaction (CER) by using density functional theory calculations and machine learning approaches. The results show that adjusting the metal's local coordination can effectively tune the CER activity and selectivity of the catalysts. The study also finds that the electronic parameters of the metal and coordination-related features play a significant role in determining the Cl binding tendencies.
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)
