Article
Materials Science, Multidisciplinary
Yunqin Hu, Linlin Xiang, Long Kuai, Yanyan Zhao, Sufeng Cao, Li Liu, Caihong Fang, Baoyou Geng
Summary: This research establishes a new method of incipient wetness impregnation (IWI) for preparing high-loading Pt/C catalysts with sub-3 nm Pt nanoparticles and a loading up to 60 wt%. A two-step reduction strategy is developed to overcome the limitations of traditional IWI method in controlling the size of Pt nanoparticles at high loadings. The as-prepared 60% Pt/C catalyst exhibits high power density and low Pt loading, outperforming the state-of-the-art commercial 60% Pt/C in H-2-air fuel cells.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Analytical
Fatemeh Davodi, Geraldine Cilpa-Karhu, Jani Sainio, Mohammad Tavakkoli, Hua Jiang, Elisabeth Muehlhausen, Galina Marzun, Bilal Goekce, Kari Laasonen, Tanja Kallio
Summary: Transition metal nanoparticles encapsulated in ultrathin graphene layers are used to anchor low amounts of dispersed platinum, creating a durable and active electrocatalyst for the hydrogen evolution reaction. The thickness of the carbon shell is crucial for efficient platinum utilization and the metal-core plays a key role in achieving promising electrocatalytic properties. This conductive core-shell catalyst support enables efficient utilization of platinum for electrocatalysis with promising durability.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Arik Beck, Hannes Frey, Xing Huang, Adam H. Clark, Emmett D. Goodman, Matteo Cargnello, Marc Willinger, Jeroen A. van Bokhoven
Summary: Platinum nanoparticles supported by titania can form overlayer due to strong metal-support interaction, which can enhance the catalyst's properties and prevent sintering. The overlayer can be reversed through oxidative treatments, but recent findings suggest its stability in oxygen. In our study, we used in situ transmission electron microscopy to investigate the changes in the overlayer under different conditions and found that high temperature and oxygen atmosphere preserved the overlayer, preventing platinum evaporation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Cristina Silva, Khirdakhanim Salmanzade, Irina Borbath, Erzsebet Dodony, Daniel Olasz, Gyorgy Safran, Andrei Kuncser, Erzsebet Paszti-Gere, Andras Tompos, Zoltan Paszti
Summary: Transition metal-doped titania and carbon composites serve as promising supports for Pt electrocatalysts in PEM fuel cells. Strong metal-support interaction (SMSI) is observed in TiO2-supported Pt catalysts, where the oxide component stabilizes the Pt particles and the dopant provides a co-catalytic function. Sn, among other elements, is a valuable additive. The influence of SMSI on the stability and performance of Pt/Ti0.8Sn0.2O2-C catalysts was investigated and it was found that the uniform oxide coverage of the carbon backbone facilitated the formation of Pt-oxide-C triple junctions, contributing to better stability of the reduced catalysts.
Article
Chemistry, Applied
Eleonora Vottero, Michele Carosso, Riccardo Pellegrini, Monica Jimenez-Ruiz, Elena Groppo, Andrea Piovano
Summary: In this article, the behavior of activated carbon and Pt and Pd catalysts in the presence of H2 was investigated using Inelastic Neutron Scattering (INS) spectroscopy. The INS spectra provided detailed information about H2 physisorption and the formation of metal hydrides upon hydrogenation. The occurrence of hydrogen spillover from the metal nanoparticles onto the activated carbon was also observed. Overall, this work provides important insights for better understanding the complex interaction between H2 and Pt and Pd-loaded activated carbon catalysts.
Article
Chemistry, Physical
Gaoxin Lin, Qiangjian Ju, Yan Jin, Xiaohuan Qi, Weijing Liu, Fuqiang Huang, Jiacheng Wang
Summary: In this study, the dissolution of Pt nanoparticles was successfully suppressed by adjusting the electronic structure of surface Pt atoms, leading to enhanced catalytic stability. The specially designed graphitic-N-doped carbon nanosheets effectively reduced the rate of Pt dissolution by anchoring Pt nanoparticles.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Fuma Ando, Takao Gunji, Toyokazu Tanabe, Isao Fukano, Hector D. Abruna, Jianfei Wu, Takeo Ohsaka, Futoshi Matsumoto
Summary: The study investigated the enhancement of the oxygen reduction reaction (ORR) activity of platinum nanoparticles using transition metal oxide supports, finding that the ORR activity depends significantly on the atomic ratio of metals in the metal oxide composite and the type of metal oxide support. It was observed that a catalyst with a d-band center approximately 0.2 eV lower than that of platinum exhibited maximal ORR activity.
Article
Nanoscience & Nanotechnology
Q. Liu, P. Rzepka, H. Frey, J. Tripp, A. Beck, L. Artiglia, M. Ranocchiari, J. A. van Bokhoven
Summary: This study investigates the sintering behavior of supported metal nanoparticles and finds that the sintering rate is accelerated when the interparticle distance is shortened. Enlarging the interparticle distance and using surface overcoating techniques can improve the resistance to sintering.
MATERIALS TODAY NANO
(2022)
Article
Chemistry, Physical
Milutin Smiljanic, Stefan Panic, Marjan Bele, Francisco Ruiz-Zepeda, Luka Pavko, Lea Gasparic, Anton Kokalj, Miran Gaberscek, Nejc Hodnik
Summary: In this study, the overall catalytic performance of Pt, the best monometallic catalyst for the hydrogen evolution reaction (HER), was improved by supporting it on conductive titanium oxynitride (TiONx) dispersed over reduced graphene oxide nanoribbons. The strong metal-support interaction (SMSI) between TiONx and Pt was identified as the cause of the improved HER activity and stability.
Article
Engineering, Environmental
Phuong Anh Nguyen, Quang Duc Dao, Thanh Truong Dang, Thi Van Anh Hoang, Jin Suk Chung, Eun Woo Shin
Summary: Understanding the metal-support interactions is crucial to develop a highly efficient Pt/g-C3N4 photocatalyst for the H2 evolution reaction. PtO species are formed via specific chemical bonding between Pt and O-containing functional groups, resulting in highly dispersed PtO species on SCN. The optimized Pt content and distribution over SCN showed the highest HER activity and charge separation efficiency, significantly enhancing the photocatalytic performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
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
Biochemistry & Molecular Biology
Hamid Rashidzadeh, Farzad Seidi, Mohammadreza Ghaffarlou, Marziyeh Salehiabar, Jalil Charmi, Kadir Yaray, Hamed Nosrati, Yavuz Nuri Ertas
Summary: As noble metals, high atomic number elements can localize X-ray radiation within tumor cells by exploiting different mechanisms. In this study, alginate-coated platinum nanoparticles were synthesized and used as a radiosensitizer to enhance X-ray therapeutic efficacy in breast cancer. The nanoparticles not only improved biocompatibility and stability, but also induced higher levels of intracellular ROS and enhanced cancer cell death under X-ray irradiation. Both in vitro and in vivo results demonstrated the radiosensitizing properties of the nanosystem. The importance of radiosensitizers for improving radiotherapy outcomes was highlighted.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Physical
Zhengyan Zhang, Zhi Teng, Xingwei Li
Summary: In this study, nitrogen-doped carbon material with a fluffy structure and high content of pyridinic-N and pyrrolic-N was prepared through the pyrolysis of polyaniline/ITO composite, serving as an optimal support for Pt catalyst. The Pt catalyst supported on this material exhibited excellent electrocatalytic performance for methanol oxidation reaction, with a remarkable stability, achieving an activity retention rate of 89.3% after 1000 cycles of cyclic voltammetry.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Lixin Fan, Junjie Zhao, Xiaobing Luo, Zhengkai Tu
Summary: This paper investigates the degradation characteristics of PEMFCs with Pt black and Pt/C catalysts, and finds that the performance degradation of Pt black catalyst is more severe than that of Pt/C catalyst, mainly due to the different decay mechanisms of these two catalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Munish Kumar, Ratnesh Kumar Pandey, Sachin Pathak, Vandana, Sunil Ojha, Tanuj Kumar, Ramesh Kumar
Summary: A systematic study of nanostructuring of platinum (Pt) thin films of different thicknesses deposited on silicon substrates under low energy Kr+ ion irradiation was conducted. The study found that higher thicknesses of Pt thin films are more favorable for nanostructures formation, with sputtering being the principal factor causing surface nanostructuring.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Coatings & Films
Kenta Kakitani, Tetsuya Kimata, Tetsuya Yamaki, Shunya Yamamoto, Tomitsugu Taguchi, Tomohiro Kobayashi, Wei Mao, Takayuki Terai
SURFACE & COATINGS TECHNOLOGY
(2018)
Article
Chemistry, Physical
Kenta Kakitani, Tetsuya Kimata, Tetsuya Yamaki, Shunya Yamamoto, Daiju Matsumura, Tomitsugu Taguchi, Takayuki Terai
RADIATION PHYSICS AND CHEMISTRY
(2018)
Article
Instruments & Instrumentation
Tetsuya Kimata, Kenta Kakitani, Shunya Yamamoto, Tetsuya Yamaki, Takayuki Terai, Kazutaka G. Nakamura
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2019)
Article
Chemistry, Physical
Hiroyuki Okazaki, Kenta Kakitani, Tetsuya Kimata, Akira Idesaki, Hiroshi Koshikawa, Daiju Matsumura, Shunya Yamamoto, Tetsuya Yamaki
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Nuclear Science & Technology
Tetsuya Kimata, Kenta Kakitani, Shunya Yamamoto, Tetsuya Yamaki, Takayuki Terai, Kazutaka G. Nakamura
RADIATION EFFECTS AND DEFECTS IN SOLIDS
(2020)
Article
Physics, Applied
Tetsuya Kimata, Sho Kato, Tomohiro Kobayashi, Shunya Yamamoto, Tetsuya Yamaki, Takayuki Terai
Summary: In this study, glassy carbon substrates implanted with platinum ions were analyzed. It was found that ion beam sputtering significantly affected the depth profile during platinum-ion implantation. Cross-sectional TEM revealed that the implanted platinum atoms were in the amorphous state and did not aggregate. Chemical state analysis suggested that lattice defects in the substrates caused platinum-carbon interaction with electron transfer from platinum to carbon.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Itsuki Takagi, Yuma Konno, Tetsuya Kimata, Kazutaka G. Nakamura
Summary: In this study, coherent phonons in glassy carbon are investigated using transient reflection measurements with pump-probe spectroscopy. By selecting specific wavelengths for measurements of reflected probe pulses, detection of coherent oscillation of optical phonons in a polished glassy carbon sample is achieved. We demonstrate that the G and D mode oscillations occur at frequencies of 46.8 and 38.2 THz, respectively, and have a similar lifetime of 0.17 ps. Furthermore, we observe that the D mode peak is anisotropic and spreads towards lower energies.
Article
Nanoscience & Nanotechnology
Tetsuya Kimata, Sho Kato, Tomohiro Kobayashi, Shunya Yamamoto, Tetsuya Yamaki, Takayuki Terai
Summary: Researchers used ion implantation technique to prepare platinum nanoparticles with superior catalytic properties for fuel cell applications, and compared them with platinum nanoparticles prepared by conventional magnetron sputtering method. The results showed that the platinum nanoparticles prepared by ion implantation technique exhibited better durability. It was suggested that the defective structure of the glassy carbon substrate caused by Pt-ion implantation enhanced the interaction between the substrate and Pt-carbon support, thus improving the durability of the platinum nanoparticles.
Correction
Materials Science, Multidisciplinary
Tetsuya Kimata, Kazuma Yoda, Hana Matsumoto, Hiroyuki Tanabe, Fujio Minami, Yosuke Kayanuma, Kazutaka G. Nakamura
Article
Materials Science, Multidisciplinary
Tetsuya Kimata, Kazuma Yoda, Hana Matsumoto, Hiroyuki Tanabe, Fujio Minami, Yosuke Kayanuma, Kazutaka G. Nakamura
Proceedings Paper
Optics
Tetsuya Kimata, Kosuke Shigematsu, Hirotomo Nakajima, Junko Morita
DETECTION AND SENSING OF MINES, EXPLOSIVE OBJECTS, AND OBSCURED TARGETS XXIV
(2019)
Article
Materials Science, Coatings & Films
Yanchun Xie, Xiaodong Wang, Shenshen Cui, Jiali Hu, Yongcun Wei, Yi Lian, Anwu Xuan, Bin Yu, Erlin Zhang
Summary: In this study, Ti-xFe (x = 3,5,9 wt%) alloys were surface modified by micro-arc oxidation (MAO) to improve their antimicrobial properties and biocompatibility. The results showed that increasing the oxidation voltage greatly enhanced the roughness and hydrophilicity of Ti-xFe-MAO alloys. The Ti-xFe alloys micro-arc oxidized at 250 V and 300 V exhibited improved corrosion resistance and excellent antimicrobial and cytocompatibility properties, making them suitable for orthopedic implant materials.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuting Hao, Zuoyan Ye, Lili Wang, Minheng Ye, Hui Dong, Chao Wang, Yunchen Du
Summary: This study focuses on the modification of PEO coatings on Ta-12W alloy using NH4F additive. The results show that ultra-low porosity coatings can be prepared by optimizing the NH4F content. The formation process of specific structures on the coating surface is discussed, and the effects of NH4F concentration and treatment duration on coating characteristics are investigated.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuanzhuo Liu, Linjiang Chai, Tao Yang, Chaodan Hu, Chuanmei Wang, Guoqiang Xi
Summary: By employing a pulsed laser, laser cladding was performed on IN718 alloy pre-coated with CrCoNi-TiC/SiC powders and three defect-free coatings were successfully prepared. The addition of TiC and SiC powders generated fine carbides dispersed in the coatings and led to changes in grain and substructure morphologies, resulting in increased hardness and wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
M. Ghaemi, A. Lopez-Cazalilla, K. Sarakinos, G. J. Rosaz, C. P. A. Carlos, S. Leith, S. Calatroni, M. Himmerlich, F. Djurabekova
Summary: The use of high-power impulse magnetron sputtering can result in dense and uniform niobium films on all surfaces of superconducting rf cavities, as simulated and investigated in this study.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Jiaheng Du, Xinli Fan, Dongqin Xiao, Wuxiang Wang, Yiran Yin, Zhong Li, Kui He, Yanfei Tan, Jiyuan Yan, Gangli Liu, Ke Duan
Summary: This study investigated the electrophoretic deposition (EPD) of magnesium oxide (MgO) coatings on micro-arc oxidized titanium (MAO-Ti) and evaluated their in vitro antibacterial properties and biocompatibility. The results showed that MgO coatings significantly reduced bacterial numbers and biofilm formation, while also demonstrating good cytocompatibility and induction of osteoblast mineralization.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Samiksha Moharana, Yuichi Otsuka, R. Gnanamoorthy
Summary: The addition of titania to HAp coatings improves their wear resistance and reduces damage to titanium implants caused by debris generation. This study evaluates the fretting wear resistance of titania-added HAp suspension plasma spray coating and finds that it exhibits reduced friction coefficient and increased wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Li-Ping Wu
Summary: The functional hazenite coating deposited on AZ31 Mg alloy showed improved roughness and hydrophilicity, enhanced biocompatibility, reduced degradation rate, and decreased susceptibility to stress corrosion cracking.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Ning Tian, Delei Xu, Jinfei Wei, Bucheng Li, Junping Zhang
Summary: This study reports the preparation of a superhydrophobic and anti-bacterial fabric for face masks. The fabric exhibits high superhydrophobicity and excellent moisture resistance, enabling functionality effectiveness in cold weather conditions. The fabric also demonstrates remarkable anti-bacterial activity against E. coli, attributed to the synergistic effect of superhydrophobicity and embedded ZnO nanoparticles. This superhydrophobic anti-bacterial fabric holds great potential for various practical applications in personal protective equipment, healthcare, and disease prevention.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Katharina Beck, Anke S. Ulrich, Andreas K. Czerny, Emma M. H. White, Martin Heilmaier, Mathias C. Galetz
Summary: Refractory metal based alloys have great potential as structural materials for high-temperature applications due to their high melting points. However, they are prone to catastrophic oxidation at around 700 degrees C. This study investigated the effect of aluminium diffusion coatings on the oxidation resistance of pure molybdenum, niobium, tantalum, and tungsten. The results showed that the aluminization improved the oxidation behavior and decreased the oxide growth rate for molybdenum and tantalum.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Wenwen Shuai, Haijun Dou, Zhichen Guan, Wei Qian, Zhibao Li, Yinqun Hua, Jie Cai
Summary: This study synthesized (Y1-xLax)3Al5O12 (x = 0, 0.1, 0.2, 0.3) materials by doping lanthanum ions, and found that the doped materials exhibited improved mechanical properties and thermal expansion coefficient, as well as enhanced resistance to CMAS corrosion. These materials have potential applications.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Xianglei Liu, Jiahui Ding, Wanbo Hou, Xinhao Shi, Tao Feng, Xiangyuan Meng, Shifeng Wen, Mingde Tong, Zhufeng Yue
Summary: A composite coating was developed to improve the adhesion, wear resistance, and corrosion resistance, which exhibited significant enhancements in these properties.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hongxuan Xing, Jidong Li, Xianwei Hu, Liang Tian, Renyun Zhang, Yiyong Wang
Summary: By depositing a Cu/Co-Mo corrosion-resistant plating layer on the surface of 6061 Al alloy, the bonding strength between the alloy and the plating layer can be improved and the corrosion resistance can be enhanced. The composite coating forms an obvious three-layer structure with Co-Mo coating exhibiting amorphous characteristics and Co3Mo phase composition. The composite coating improves the corrosion resistance and hardness of the substrate, effectively protecting the 6061 Al alloy.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Fan Yang, Debin Wang, Tianrun Li, Baijun Yang, Suode Zhang, Jianqiang Wang
Summary: The impact-corrosion behavior of monolayer and hierarchical Fe-based amorphous coatings fabricated by HVAF was investigated in 3.5 wt% NaCl solution. The monolayer coating exhibits corrosion failure with increased impact energy, while the hierarchical coating shows improved resistance. However, at high impact energies, both coatings experience corrosion degradation.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Shoaib Ahmad, Muddasir Nawaz, Solaiman Mohammad, R. A. Shakoor, Ramazan Kahraman, Talal Mohammed Al Tahtamouni
Summary: This research presents a novel self-healing anti-corrosion composite coating that demonstrates higher inhibition efficiency and self-healing effect, providing protection for metallic structures against corrosive environments.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hui-Wen Peng, Chun-Hway Hsueh
Summary: A series of (CoCrNi)100-x-ySixNdy medium entropy alloy films with manipulated metalloid element, Si, and rare earth element, Nd, were synthesized using magnetron three-target co-sputtering. The films showed different structures and mechanical properties with varying Si and Nd contents. The optimized mechanical properties were observed in the film with Si0.61Nd5.14, attributed to precipitation strengthening and grain refinement.
SURFACE & COATINGS TECHNOLOGY
(2024)
