Article
Nanoscience & Nanotechnology
Yanxia Gao, Dongxu Yan, Chunqi Wang, Jing Chen, Jin Chen, Hongpeng Jia
Summary: This study focuses on improving the loading content and stability of noble metal single-atom catalysts (SACs). The researchers successfully achieved high-loading and stable Pt single atoms on La2O3 through capturing and confining PtO2 species released from Pt nanoparticles. The in situ high-temperature reaction process also facilitated the atomization of Pt nanoparticles and stabilization of Pt atoms, leading to enhanced catalytic oxidation activity for CH4. Additionally, this strategy simplified the controllable preparation of thermally stable SACs and expanded their practical application under various conditions.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Michael J. Dzara, Andres O. Godoy, Madeleine Odgaard, Barr Zulevi, Alexey Serov, Jasna Jankovic, Svitlana Pylypenko
Summary: The study investigates the detailed investigation of commercially available mesoporous nitrogen-functionalized carbon supports and platinum nanoparticles-based ORR catalysts, presenting their physicochemical properties and ORR performance in membrane electrode assemblies. The results demonstrate that carbon supports with engineered morphologies and compositions are a promising platform for producing supports and catalysts with tunable properties for various applications.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Mingzhen Hu, Zengjian Cai, Xinhu Liang, Ganggang Li, Haiyan Tan, Shitu Yang, Hao Ren, Zhe Wang, Guodong Sun, Shoujie Liu, Zhengping Hao, Kebin Zhou
Summary: This study presents a surface-confined strategy for preparing ultrafine Pt-rare earth nanoalloys on N-functionalized supports. By coordinating surface N-metal, the metal cations are atomically dispersed on the support, facilitating uniform nucleation and growth of particles. Moreover, the moderate metal transfer barrier from N ensures confined particle growth, resulting in the formation of ultrafine nanoalloys.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Oliver Renk, Anton Hohenwarter, Verena Maier-Kiener, Reinhard Pippan
Summary: Pt and its alloys are widely used in catalysis and the jewelry industry. Severe plastic deformation and appropriate recovery annealing can enhance the hardness of the alloys, and the role of grain boundaries becomes more significant at the submicron scale.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Abigail M. Fagan, William R. Jeffries, Kenneth L. Knappenberger, Raymond E. Schaak
Summary: Gold nanoparticles exhibit size-dependent properties, but when interfaced with comparably sized platinum nanoparticles, the electron-phonon coupling constant of the hybrid material is dependent on the gold domain diameter. By synthesizing a library of size-tunable Au-Pt hybrid nanoparticle heterodimers, researchers were able to tune the gold domain diameter while keeping the platinum size constant, leading to insights into growth and morphology. Femtosecond time-resolved transient absorption spectroscopy showed that the electron-phonon coupling constant decreases significantly for certain Au-Pt heterodimers, highlighting the potential for designing composite metals for photocatalytic and light-harvesting applications.
Article
Engineering, Environmental
Jing-He Lai, Namasivayam Dhenadhayalan, Anuj Chauhan, Chiao-Wen Chien, Jen-Chen Yeh, Pei-Qi Hung, King-Chuen Lin
Summary: Hafnium oxide nanohybrids with metal nanoparticle incorporation were synthesized and displayed excellent photocatalytic activity for the degradation of antibiotics in water treatment. The nanohybrids showed a sustainable nature and have potential applications in environmental remediation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Vera Giulimondi, Andrea Ruiz-Ferrando, Adam H. Clark, Selina K. Kaiser, Frank Krumeich, Antonio J. Martin, Nuria Lopez, Javier Perez-Ramirez
Summary: This study investigates the indirect, coordination-induced catalytic synergies in carbon-supported Ru-Pt SACs and reveals a new principle of intermetallic cooperativity.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Kohsuke Mori, Yuki Shimoji, Hiromi Yamashita
Summary: In this study, the interface between Pt nanoparticles and a TiN support was modified using a highly dispersed amorphous LaOx phase, resulting in enhanced activity and long-term stability of the Pt/LaOx/TiO(N) catalyst during APRM reaction under base-free conditions. The amorphous LaOx phase promoted the deposition of small Pt nanoparticles with narrow size distribution and generated electron-deficient Pt. Kinetic isotope data assessment and theoretical investigations showed that cationic Pt nanoparticles facilitated the cleavage of O-H and C-H bonds in methanol, while amorphous LaOx enhanced water dissociation, enabling the water-gas shift reaction under mild conditions.
Article
Materials Science, Multidisciplinary
Emilia Alwin, Michal Zielinski, Agata Suchora, Iwona Gulaczyk, Zbigniew Piskula, Mariusz Pietrowski
Summary: It was discovered that the specific surface area of graphitic carbon nitride (g-C3N4) could be increased through etching by Pt and Ru nanoparticles. These metal nanoparticles catalyze the hydrogenation reaction of C - N bonds and move through the structure of g-C3N4, creating tunnels and spongy graphitic carbon nitride (sgCN). The reactions occur on the surface of the metal nanoparticles, which are covered with oxidized forms of Pt and Ru that can strongly interact with nitrogen. The process was observed through mass spectrometry and temperature programmed reduction with on-line infrared spectroscopy. A probable mechanism of g-C3N4 hydrogenation was proposed based on thermodynamic considerations and quantum mechanical calculations.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Ninghua Fu, Xiao Liang, Zhi Li, Yadong Li
Summary: Single-atom site catalysts with high specific surface area supports have great potential in achieving maximum metal dispersion, resulting in highly efficient catalysis. The selection of suitable supports plays a crucial role in determining the structures and properties of these catalysts.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Energy & Fuels
Youngwon Ju, Taehoon Cho, Kichul Lee, Jiwoong Kim, Chang Won Yoon, Joohoon Kim
Summary: We report the size-dependent activity of Pt nanoparticles in the range of 1 to 4 nm for the hydrolytic dehydrogenation of ammonia borane. Pt nanoparticles with different sizes were encapsulated inside dendrimers to study their intrinsic size effect on catalytic activity. The results showed that Pt nanoparticles exhibited significant catalytic activity, and the size-dependent activity was attributed to the geometric nature of the nanoparticles.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
J. Molina, A. Valero-Gomez, F. Bosch
Summary: A thermal method for the synthesis and fixation of Pt nanoparticles on carbon paper is proposed in this paper. The method involves coating the carbon paper with H2PtCl6 and decomposing it into Pt nanoparticles at a temperature of 600 degrees C. The formed Pt nanoparticles are able to oxidize the surrounding carbon fiber surface, promoting the generation of nano-roughness and favoring their fixation on carbon paper. The proposed method offers the advantage of achieving small size nanoparticles and enhanced fixation when compared with electrochemical synthesis.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Agus R. Poerwoprajitno, Lucy Gloag, John Watt, Soshan Cheong, Xin Tan, Han Lei, Hassan A. Tahini, Aaron Henson, Bijil Subhash, Nicholas M. Bedford, Benjamin K. Miller, Peter B. O'Mara, Tania M. Benedetti, Dale L. Huber, Wenhua Zhang, Sean C. Smith, J. Justin Gooding, Wolfgang Schuhmann, Richard D. Tilley
Summary: Single Pt atom catalysts with high exposure are key targets to enhance electrocatalytic activity, and PtRu alloy nanoparticles are the most active catalysts for the methanol oxidation reaction. This study demonstrates a process to create single-Pt-atom-on-Ru catalysts by growing and spreading Pt islands on Ru branched nanoparticles. The formation of a stable single atom structure is driven by the formation of strong Pt-Ru bonds and the lowering of the surface energy of the Pt islands, resulting in a high current density and mass activity for the methanol oxidation reaction over time.
Review
Materials Science, Multidisciplinary
Xueye Chen, Honglin Lv
Summary: Nanoparticles play important roles in various fields due to their unique properties, and machine learning-assisted synthesis of nanoparticles can address the challenges in nanoparticle preparation.
NPG ASIA MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Leandri Vermaak, Hein W. J. P. Neomagus, Dmitri G. Bessarabov
Summary: This study experimentally evaluated and compared the performance of Pt/C and Pt-Ru/C electrocatalysts for high-temperature electrochemical hydrogen separators. The results showed that Pt-Ru/C was more tolerant to CO and performed better in the presence of H2/CO gas mixture, suggesting its potential in mitigating CO poisoning.
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)