Article
Materials Science, Multidisciplinary
Fatemeh Amereh, Rosa Jokar, Amir Hossein Baradaran Ghasemi, Ahmadreza Yazdanbakhsh, Mohammad Rafiee, Fatemeh Hosseini Alast, Salar Mahdipour Naiem
Summary: A nature-inspired plasmonic core-shell architecture was proposed using a natural siliceous insulator shell in Ag/diatomite/ZnO hierarchical nanostructures. The composite showed efficient photocatalytic performance under simulated sunlight irradiation. The enhanced photocatalysis was attributed to the photonic structure, improved sunlight harvesting efficiency, suppressed back electron transfer, and prevented oxidization of Ag. However, the composite gradually lost its photocatalytic activity after three rounds of reuse.
APPLIED MATERIALS TODAY
(2023)
Article
Chemistry, Multidisciplinary
Shumeng Zhang, Kai Liu, Zhaojun Liu, Moxuan Liu, Zhixue Zhang, Zhun Qiao, Liang Ming, Chuanbo Gao
Summary: The novel method of radial growth of Pd-rich phase on Au-Ag alloy nanowires creates fully strained catalysts with strong lattice strains, leading to enhanced catalytic activity for electrochemical oxidation of biomass-derived alcohols. The highly strained nanowires outperform their less strained counterparts, reaching significantly higher current densities and showing potential for various applications, including direct alcohol fuel cells.
Article
Chemistry, Applied
Ilya V. Mishakov, Yury I. Bauman, Yury Shubin, Lidiya S. Kibis, Evgeny Yu. Gerasimov, Maksim S. Mel'gunov, Vladimir O. Stoyanovskii, Sergey Korenev, Aleksey A. Vedyagin
Summary: A single-phase micro-disperse Ni-Pd (5 wt.%) alloy was studied as a catalyst precursor for the synthesis of nanostructured carbon. N-doped carbon nanofibers were successfully synthesized by joint decomposition of C2H4Cl2 and CH3CN vapors in H-2 excess. The intensive metal dusting of the Ni-Pd alloyed precursor in reaction conditions led to its complete disintegration.
Article
Materials Science, Multidisciplinary
Alexandru B. Georgescu, Andrew J. Millis, James M. Rondinelli
Summary: We studied the consequences of the approximately trigonal point symmetry of the transition metal site in two-dimensional halides and explained why most of these materials are insulating. Furthermore, we analyzed the possibility of orbital order coupled to lattice modes and discussed the unique electronic states in this class of materials.
Article
Chemistry, Physical
Amit Kumar Chawla, Shikha Wadhwa, Arka Bikash Dey, Florian Bertram, Saif A. Khan, Ratnesh Pandey, Mukul Gupta, Vipin Chawla, Akula Umamaheswara Rao, D. K. Avasthi
Summary: This study focuses on the synthesis of Pd-Ag nano-composite films by magnetron cosputtering and the structural changes in the alloy film during hydrogenation and dehydrogenation processes. Synchrotron X-ray diffraction was used to reveal subtle structural changes occurring, showing that adding Ag to Pd can completely remove dissolved hydrogen. Lower concentrations of Ag in Pd exhibit better performance during hydrogenation/dehydrogenation processes.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Nanoscience & Nanotechnology
Seohan Kim, Jose Montero, Janghee Yoon, Yunju Choi, Sungmin Park, Pungkeun Song, Lars Ospacing
Summary: This study explores the preparation of ultrathin APC:O continuous coatings on ITO-coated PET substrates through controlled oxidation. Moderate oxidation can suppress Ag agglomeration, while extensive oxidation leads to Pd oxide nucleation and deterioration of film conductivity. The resulting ITO/APC:O/ITO films exhibit low resistivity, excellent optical and electrical properties, high environmental stability, and good mechanical bending properties, providing new opportunities for fabricating superior transparent conducting coatings on polymer substrates.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
T. Van Tran, M. J. Ahemad, D. -S. Kim, T. D. Le, V. Dao, Y. -T. Yu
Summary: Pd@Au@ZnO core-double shell nanoparticles (CDS-NPs) with an added Au shell layer between the Pd core and ZnO shell were fabricated to improve the response and selectivity to hydrogen gas. After calcination, the Pd core becomes a gradient composition Pd-Au alloy, resulting in higher response and selectivity.
MATERIALS TODAY NANO
(2023)
Article
Chemistry, Multidisciplinary
Xin Wen, Seyed Amirabbas Nazemi, Robson Rosa da Silva, Kasper Moth-Poulsen
Summary: Hollow Ag-Pd alloy nanodendrites and nanoboxes with large surface area were successfully fabricated by using different Pd precursors. The use of H2PdCl4 precursor led to the formation of hollow nanodendrite structures, while the slower reduction of Pd(acac)(2) led to the formation of hollow nanoboxes. The microstructure, chemical composition, and properties of growth solutions were analyzed using transmission electron microscopy, energy-dispersive X-ray spectroscopy, and ultraviolet-visible spectroscopy.
Article
Chemistry, Physical
Qi Zhou, Sifan Luo, Miao Zhang, Ningbo Liao
Summary: This study used density functional theory simulations to investigate the hydrogen separation performance of Pd-Au-Ag membrane and compared it with Pd-Au alloy. The results showed that the Pd-Au-Ag alloy exhibited superior selectivity and permeability, making it a promising membrane for hydrogen separation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Zhou Zhang, Yifan Zhu, Jialin Ji, Jianxin Zhang, Huifang Luo, Chenguang Fu, Qianqian Li, Madison Brod, G. Jeffrey Snyder, Yubo Zhang, Jiong Yang, Wenqing Zhang
Summary: In recent years, materials with metal-to-insulator phase transitions have attracted great attention due to their property variations before and after the transition. MgAgSb, an important thermoelectric material, experiences a metal-insulator transition and deterioration of thermoelectric properties in the mid-temperature beta-phase. This work reveals that the Ag atomic rearrangement between the two phases is the major reason responsible for the transition and deterioration.
MATERIALS TODAY PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Shirui Luo, Renjie Chen, Jing Wang, Lan Xiang
Summary: In this study, a ZnO/Pd@ZIF-7 core-shell structure-based gas sensor was fabricated using a self-sacrificial method, which significantly improved the sensing selectivity of methane by utilizing the ZIF-7 filter. At low temperatures, ZIF-7 enriched gases and enhanced the response of methane, carbon monoxide, and ammonia. At elevated temperatures, ZIF-7 separated gases based on their molecular polarity, hindering the diffusion of polar carbon monoxide and ammonia more than nonpolar methane. This study not only provides a possible solution for enhancing the selectivity of metal oxide semiconductor (MOS) sensors to methane but also inspires the development of highly selective gas sensors.
ACS APPLIED NANO MATERIALS
(2023)
Article
Energy & Fuels
John C. Douglin, Jose A. Zamora Zeledon, Melissa E. Kreider, Ramesh K. Singh, Michaela Burke Stevens, Thomas F. Jaramillo, Dario R. Dekel
Summary: This study introduces a platform for facilitating the development and commercialization of anion-exchange membrane fuel cells (AEMFCs) by using ionomerless ultra-low-loading Ag-Pd alloy electrocatalyst cathodes. The cathodes show comparable activity trends to three-electrode cells and meet the platinum group metal (PGM) loading and cost targets set by the US Department of Energy.
Article
Materials Science, Coatings & Films
Yen Ngoc Nguyen, Jisun Yoon, Jiyeon Shin, Injoon Son
Summary: Pd-Ag alloy electrodeposit is proposed as a protective coating for electrical contacts. The study investigates the effect of Ag content on the contact resistance and wettability of the coatings. It is found that increasing the Ag content reduces the contact resistance but heating the coatings increases it. Additionally, the wettability of the coatings with solder is improved with increased Ag quantity.
SURFACE ENGINEERING
(2022)
Article
Chemistry, Physical
Pawel Mierczynski, Magdalena Mosinska, Waldemar Maniukiewicz, Krasimir Vasilev, Malgorzata Iwona Szynkowska-Jozwik
Summary: This study compares the physicochemical and reactivity of various bimetallic Pt-Ni, Pd-Ni, Ru-Ni, and Ag-Ni catalysts in the oxy-steam reforming of LNG for hydrogen generation. The 1%Pt-5%Ni catalyst supported on CeO2·ZrO2 (1:2) system demonstrated the highest activity, showing potential for hydrogen production for solid oxide fuel cells.
Article
Chemistry, Multidisciplinary
Qing Qu, Bin Liu, Wing Sum Lau, Ding Pan, Iam Keong Sou
Summary: Topological quantum materials have shown promise as electro-catalysts for the hydrogen evolution reaction (HER). In this study, we report a Pd(20nm)/SnTe(70nm) hetero-structure grown using molecular-beam-epitaxy and electron-beam-evaporation, which displays higher electrocatalytic activity than a pure Pd(20nm) thin film and commercial Pt foil. Density functional theory calculations reveal the importance of topological surface states (TSSs) on SnTe(001) in enhancing the catalytic performance. Our work demonstrates the potential of metal/topological material heterostructures as catalysts for HER, surpassing the activity of Pt and offering a promising direction for optimizing electrocatalysts based on topological quantum materials.
CELL REPORTS PHYSICAL SCIENCE
(2023)
