Article
Chemistry, Physical
Sangyeon Pak, Jungmoon Lim, John Hong, SeungNam Cha
Summary: This study investigated the importance of controlling carrier densities in MoS2 monolayers and found that surface functionalization can enhance the electrocatalytic performance of MoS2, showing potential for applications in hydrogen generation.
Article
Materials Science, Multidisciplinary
Florentino Lopez-Urias, Armando D. Martinez-Iniesta, Aaron Morelos-Gomez, Emilio Munoz-Sandoval
Summary: This study investigated the effects of phosphorus doping and functionalization on the structure and properties of graphene nanoribbons, revealing that phosphorus incorporation promotes p-type doping and reduces bandgap. Phosphorus-doped zigzag GNRs exhibited metallic behavior and promoted a ferromagnetic ground state, while armchair GNRs functionalized with different groups showed a localized ferromagnetic ground state. This research provides a theoretical basis for understanding the experimental evidence of ferromagnetism in phosphorus-doped graphene and the chemical activity of phosphorus-doped graphitic materials.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Antonia Kagkoura, Raul Arenal, Nikos Tagmatarchis
Summary: The construction of 3D-2D CNH-MoS2 heterostructures by introducing complementary functional groups on the surfaces of carbon nanohorns and molybdenum disulfide enhances electrocatalytic activity for proton reduction, resulting in excellent stability and efficiency.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Binbin Ding, Lianbi Li, Lei Li, Tianming Wang, Changjun Zhu, Song Feng, Zebin Li, Jun Wang, Guoqing Zhang, Yuan Zang, Jichao Hu, Caijuan Xia
Summary: In this study, large-area monolayer MoS2 films were successfully grown on graphene using chemical vapor deposition (CVD) technique with the assistance of oxygen (O2). The introduction of O2 improved the growth environment of MoS2 domains and increased the grain size of MoS2. Spectroscopic results showed the deposition of a monolayer of MoS2 with high crystal quality on graphene. Effective charge transfer was observed in MoS2/graphene heterojunctions. The photodetector prepared by MoS2/graphene film exhibited good response to light. These findings indicate the great potential of MoS2/graphene heterojunctions for optoelectronic applications.
Article
Electrochemistry
Emmanuel Boateng, Antony R. Thiruppathi, Chi-Kai Hung, Darren Chow, Deepak Sridhar, Aicheng Chen
Summary: Graphene and its derivatives have the potential to be solid-state candidates for next-generation energy and hydrogen storage technologies. However, materials that meet all targets set by the US Department of Energy have not yet been identified. This review provides an overview of recent developments in functionalized graphene-based nanomaterials for energy and hydrogen storage systems. Various synthetic approaches, effects of functionalization strategies, and recent advances in energy applications are discussed.
ELECTROCHIMICA ACTA
(2023)
Article
Energy & Fuels
Derya Oncel Ozgur
Summary: This work presents a novel nickel@nitrogen-doped graphene@MoS2 (Ni@N-Gr/ MoS2) triad heterostructure for catalytic HER. The as-synthesized Ni@N-Gr/MoS2 assembly exhibits high intrinsic HER activity and stability, thanks to the incorporation of Ni@N-Gr in the basal plane of MoS2 and the improvement of conductivity by nitrogen-doped graphene.
Article
Chemistry, Multidisciplinary
James Nicolas Pagaduan, Nicholas Hight-Huf, Avdhoot Datar, Yehiel Nagar, Michael Barnes, Doron Naveh, Ashwin Ramasubramaniam, Reika Katsumata, Todd Emrick
Summary: The engineering of work function of 2D materials with polymer coatings can significantly reduce the work function of monolayer graphene. The chemical structure of the polymer zwitterions plays a crucial role in modulating the work function, with the piperidinyl-substituted version showing the largest reduction in work function.
Article
Chemistry, Multidisciplinary
Jun Xu, Zelin Zhao, Wei Wei, Ganggang Chang, Zhizhong Xie, Wei Guo, Dan Liu, Deyu Qu, Haolin Tang, Junsheng Li
Summary: Zn-doping can enhance the electrocatalytic hydrogen evolution performance of molybdenum sulfide, leading to a high-performance HER electrocatalyst. Experimental results show that tiny Zn doping can increase the electrochemical surface area, improve the proportion of the HER active 1T phase, and form catalytic sites with higher intrinsic activity.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Demetrios D. Chronopoulos, Christina Stangel, Magdalena Scheibe, Klara Cepe, Nikos Tagmatarchis, Michal Otyepka
Summary: A new material was synthesized by combining fullerene and graphene, which are non-metal covalent hybrids. The material showed excellent electrocatalytic performance and durability for the hydrogen evolution reaction, attributed to intrahybrid charge-transfer phenomena.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Organic
Xiao-Ya Yuan, Ya-Feng Si, Xiang Li, Shao-Jie Wu, Fan-Lin Zeng, Qi-Yan Lv, Bing Yu
Summary: The direct coupling reaction between inert alkanes and quinoxalin-2(1H)-ones was successfully achieved under noble metal-free, acid-free, and oxidant-free conditions, leading to the synthesis of various 3-alkylated quinoxalin-2(1H)-ones with good to excellent yields.
ORGANIC CHEMISTRY FRONTIERS
(2022)
Review
Chemistry, Multidisciplinary
A. K. Mrinalini Kalyani, R. Rajeev, L. Benny, A. R. Cherian, A. Varghese
Summary: Developing sustainable and environment-friendly energy conversion and storage devices requires advanced and economical nano-structured electro-catalysts, such as graphitic carbon nitride (g-C3N4), which has gained attention due to its synthesis ease, high nitrogen content, conductivity, and tunable band gap energy. Research on the structural modifications of g-C3N4, including functionalization, elemental doping, and hybridizing techniques, has focused on improving its electro-catalytic performance by increasing the number of active sites. This review provides a concise perspective on surface tuning of g-C3N4 for enhancing its electrocatalytic applications. (c) 2023 Elsevier Ltd. All rights reserved.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Physical
Hanleem Lee, Sora Bak, Joosung Kim, Hyoyoung Lee
Summary: The study focuses on the effects of organic dopants reactivity on MoS2 and how it influences the electrical properties of MoS2. The band state of the dopants causes a proportional shift in the threshold voltages of the field-effect transistors, while on/off current ratio and mobility are strongly influenced by the defect density depending on the reactivity of the doping reaction. Through an in-depth study on the doping reaction, a solution-processed FET and a TFT with high mobility and a relatively high on/off ratio are successfully fabricated.
Article
Chemistry, Multidisciplinary
Manuel Vazquez Sulleiro, Aysegul Develioglu, Ramiro Quiros-Ovies, Lucia Martin-Perez, Natalia Martin Sabanes, Maria Lourdes Gonzalez-Juarez, I. Jennifer Gomez, Mariano Vera-Hidalgo, Victor Sebastian, Jesus Santamaria, Enrique Burzuri, Emilio M. Perez
Summary: The research successfully achieved the coupling of 2H-MoS2 and graphene in field-effect transistors through covalent grafting, providing the possibility of functionalizing multiple devices.
Article
Chemistry, Multidisciplinary
Dario Marchiani, Andrea Tonelli, Carlo Mariani, Riccardo Frisenda, Jose Avila, Pavel Dudin, Samuel Jeong, Yoshikazu Ito, Francesco Saverio Magnani, Roberto Biagi, Valentina De Renzi, Maria Grazia Betti
Summary: This study investigates the electron doping of graphene by adsorbing potassium on free-standing nanoporous graphene. By monitoring the electron migration in the downward-shifted conduction band, the authors observe an increase in the spectral density of electron states and a blue-shift in the associated plasmon upon increasing potassium dose. Spatially resolved photoemission confirms the correlation between electronic states and Dirac plasmon evolution.
Article
Chemistry, Physical
Jung Sun Ko, Dong Hee Shin, Won Jun Lee, Chan Wook Jang, Sung Kim, Suk-Ho Choi
Summary: This study presents a novel all-two-dimensional vertical-heterostructure photodetector with a balance between performance and comfort, showing promising applications in flexible, foldable, and/or semitransparent electronic/optoelectronic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Zhiyong Yu, Shulin Xu, Yonggang Feng, Chengyong Yang, Qing Yao, Qi Shao, Ya-Fei Li, Xiaoqing Huang
Summary: In this study, active and stable Pd-Se alloy electrocatalysts with controlled phase for alkaline ORR were explored, showing that Pd17Se15 NPs/C exhibit much better ORR performance compared to Pd17Se4 NPs/C, commercial Pd/C, and Pt/C. The enhanced activity is attributed to the stronger oxygenated species adsorption capacity of Pd in Pd17Se15, leading to more charge transfer from the surface to the *OOH intermediate as revealed by DFT analysis.
Article
Nanoscience & Nanotechnology
Wenyu Wang, Yang Zhu, Xiaorong Zhu, Yafei Zhao, Zhenggang Xue, Can Xiong, Zhiyuan Wang, Yunteng Qu, Junjie Cheng, Min Chen, Manman Liu, Fangyao Zhou, Haoran Zhang, Zheng Jiang, Yidong Hu, Huang Zhou, Huijuan Wang, Yafei Li, Yangzhong Liu, Yuen Wu
Summary: This study successfully constructed Ru single-atom enzymes with superior activity and stability by using carbon dots as the carrier material, leading to a lethal effect on cancer cells. The Ru single-atom enzymes exhibit excellent peroxidase-like activity, activating H2O2 to produce reactive oxygen species that cause damage to cancer cells.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Wei Li, Dongdong Wang, Tianyang Liu, Li Tao, Yagang Zhang, Yu-Cheng Huang, Shiqian Du, Chung-Li Dong, Zhijie Kong, Ya-fei Li, Shanfu Lu, Shuangyin Wang
Summary: In this study, the phosphate tolerance of PtFe ordered intermetallic alloys was enhanced through a doping-modulated strain strategy with Cu as a dopant, leading to improved performance in HT-PEMFCs. The Cu doping helped to create compressive strain in PtFe crystals, altering the electronic structure of electrocatalysts and weakening the adsorption energy between phosphoric acid and Pt surfaces. The HT-PEMFCs assembled with these cathodic electrocatalysts showed higher peak power and stability compared to commercial Pt/C electrocatalysts.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Ziqing Shui, Yu Wang, Yafei Li
Summary: In this study, the catalytic performance of antimony (Sb) for CO2 reduction was investigated using computational and modeling methods. The results show that certain facets of Sb are more favorable for adsorbing key intermediates, which explains experimental observations. The thickness of Sb nanosheets also affects the activity, with bilayer Sb exhibiting the highest activity. The catalytic performance of the bilayer can be further enhanced through strain engineering.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Tianyang Liu, Yu Jing, Yafei Li
Summary: Two-dimensional biphenylene, a newly synthesized metal-free catalyst, shows good ORR activity due to its metallic nature and positively charged carbon atoms, especially in alkaline conditions. It also exhibits good electrochemical stability, making it a promising candidate for alkaline fuel cells.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Chen Peng, Xiaorong Zhu, Zikai Xu, Shuai Yan, Lo Yueh Chang, Zhiqiang Wang, Junbo Zhang, Menghuan Chen, Tsun-Kong Sham, Yafei Li, Gengfeng Zheng
Summary: Utilizing an electrochemical delithiation strategy, a lithium vacancy-tuned Li2CuO2 catalyst was developed to enhance the efficiency and selectivity of electrochemical CO2 reduction to valuable multi-carbon (C2+) products. The introduction of lithium vacancies led to improved CO-CO coupling, resulting in a high Faradaic efficiency of 90.6 +/- 7.6% for C2+ and an outstanding partial current density of -706 +/- 32 mA cm(-2) under certain conditions. This work demonstrates a promising approach to produce controllable alkali metal vacancy-tuned Cu catalytic sites for C2+ products in electrochemical CO2 reduction.
Article
Chemistry, Multidisciplinary
Yanyan Li, Xiaorong Zhu, Lei Li, Fayan Li, Xinyu Zhang, Yafei Li, Zhiping Zheng
Summary: Literature reports suggest that single-atom catalysts outperform cluster and nanoparticles in primary structures due to their high atom utilization and finely-tuned electronic structure. Hierarchical structures, such as a unique hollow double-shell model, have recently gained attention for their increased active sites and improved catalytic performance. This study investigates the differences between single atom, cluster, and nanoparticle Co catalysts and their corresponding structure-activity relationships.
Article
Chemistry, Physical
Shengtang Liu, Chun Wang, Jianghua Wu, Bailin Tian, Yamei Sun, Yang Lv, Zhangyan Mu, Yuxia Sun, Xiaoshan Li, Fangyuan Wang, Yiqi Wang, Lingyu Tang, Peng Wang, Yafei Li, Mengning Ding
Summary: The study introduces a high-performance 2D monolayer Bi2WO6 catalyst for the electrocatalytic conversion of CO2 to formic acid. Through detailed experimental and theoretical investigations, the study reveals the catalytic mechanism behind its high efficiency and superior performance.
Article
Chemistry, Physical
Tehua Wang, Li Tao, Xiaorong Zhu, Chen Chen, Wei Chen, Shiqian Du, Yangyang Zhou, Bo Zhou, Dongdong Wang, Chao Xie, Peng Long, Wei Li, Yanyong Wang, Ru Chen, Yuqin Zou, Xian-Zhu Fu, Yafei Li, Xiangfeng Duan, Shuangyin Wang
Summary: This study presents a hydrogen production system that combines anodic and cathodic H-2 production from low-potential aldehyde oxidation and the hydrogen evolution reaction, respectively, at a low voltage of about 0.1V. Unlike conventional aldehyde electrooxidation, the low-potential aldehyde oxidation enables the hydrogen atom to recombine into H-2 gas. The assembled electrolyser requires only about 0.35 kWh of electricity input per m(3) of H-2, providing a promising avenue for the safe, efficient and scalable production of high-purity hydrogen.
Article
Chemistry, Multidisciplinary
Ke Guo, Dongping Fan, Yixian Teng, Dongdong Xu, Yafei Li, Jianchun Bao
Summary: In this study, the morphological evolution of PdIr nanostructures in aqueous solution was achieved through the synergistic effect of self-assembled functional surfactants and different halide ions. The PdIr nanodendrites exhibited enhanced electrocatalytic activity, stability, and anti-poisoning ability towards alcohol electrooxidation reactions.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Multidisciplinary Sciences
Junyuan Duan, Tianyang Liu, Yinghe Zhao, Ruoou Yang, Yang Zhao, Wenbin Wang, Youwen Liu, Huiqiao Li, Yafei Li, Tianyou Zhai
Summary: This study proposes a superlattice model with alternating metal oxides and selenide sublayers, in which electrons are rapidly exported through the conductive metal selenide layer to protect the active oxide layer from self-reduction. The active [Bi2O2]2+ sublayers retain oxidation states during CO2 electroreduction due to rapid electron transfer through the conductive [Cu2Se2]2- sublayer. Theoretical calculations reveal high activity of the [Bi2O2]2+ sublayers, achieving over 90% formate selectivity. This work expands the understanding and improvement of CO2 electroreduction properties in metal oxide systems.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Yuxuan Lu, Tianyang Liu, Yu-Cheng Huang, Ling Zhou, Yingying Li, Wei Chen, Liu Yang, Bo Zhou, Yandong Wu, Zhijie Kong, Zhifeng Huang, Yafei Li, Chung-Li Dong, Shuangyin Wang, Yuqin Zou
Summary: This study investigates the different catalytic processes of HMFOR and identifies direct and synergistic oxidation types. The introduction of nickel into cobalt oxide catalysts improves the hydroxyl activity and achieves optimal HMFOR performance.
Article
Chemistry, Physical
Yang Yang, Shuya Wei, Yafei Li, Donggang Guo, Huajie Liu, Lu Liu
Summary: This study reports a method of forming a crystalline-amorphous (c-a) interface by modulating the crystallinity of the material to improve the catalytic activity and structural stability of oxygen evolution reaction (OER). By adjusting the cobalt content in NiFe layered double hydroxide (LDH), the c-a interfacial site of the material can be controlled, resulting in low overpotential and excellent stability.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Applied
Xiaoxu Sun, Xiaorong Zhu, Yu Wang, Yafei Li
Summary: Based on density functional theory computations and microkinetic modeling, researchers have discovered a novel two-dimensional material, 1T'-MoTe2 monolayer, which can serve as an efficient non-precious electrocatalyst for the two-electron oxygen reduction reaction (2e-ORR) to directly synthesize hydrogen peroxide (H2O2) in acidic media. This material exhibits stability, high activity, and selective formation of H2O2, making it a promising candidate for catalyzing the electrochemical reduction of O2 to H2O2.
CHINESE JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Physical
Shulin Xu, Yu Wang, Yafei Li
Summary: This study investigates the hydrogen evolution reaction (HER) on single-layer PdX2 nanosheets through density functional theory computations. The results show that PdX2 nanosheets with low concentrations of X vacancies exhibit favorable hydrogen adsorption free energy. The HER performance can be greatly enhanced with small external strains.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
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)