Article
Energy & Fuels
Zhenbiao Dong, Junjie Ma, Dongmei Qin, Sheng Han
Summary: This study successfully prepared VO/Ti-Nb-O nanotubes through surface electrochemical reduction-introduced oxygen vacancies and bulk-phase Nb doping, improving optical absorption and photogenerated electron-hole separation-transport performances for high-efficiency photoelectrochemical water splitting.
Article
Electrochemistry
Tengfei Li, Zhenbiao Dong, Yuzhuang Zhao, Yajie Yuan, Zhenyu Li, Hualin Lin, Sheng Han
Summary: By doping Nb and engineering surface oxygen vacancies, the electrochemical performance of TiO2 can be improved, leading to enhanced application in supercapacitors. This modification strategy significantly enhances the specific capacitance, energy density, power density, and cycling stability of TiO2.
ELECTROCHIMICA ACTA
(2023)
Article
Energy & Fuels
Li Fu, Hongmei Yu, Yimin Lin, Wanqing Fang
Summary: The alpha-Fe2O3-H@CoO-H/Ti foil synthesized by a two-step calcination process is used as a photoanode for photoelectrochemical water splitting, with a nanowheat-like structure and surface defects favorable for light absorption and charge carrier separation. Characterization studies show that the photoanode exhibits high photocurrent densities at 1.23V and 1.6V versus reversible hydrogen electrode. Electrochemical impedance spectroscopy reveals decreased resistance and improved charge carrier behavior at the interface. Various factors including morphology, residual catalyst, and surface defects play important roles in enhancing the efficiency of photoelectrochemical water splitting.
Article
Chemistry, Physical
Zhenbiao Dong, Dongmei Qin, Yanjie Pan, Haidong Li, Yu Zhu, Xuhui Liu, Ergeng Zhang, Zhenyu Li, Sheng Han
Summary: In this study, a CdS/Ti-Nb-O composite photoanode with satisfactory charge transfer and optical absorption was reported for enhanced PEC performance. The composite system exhibited remarkable photocurrent density and solar-to-hydrogen conversion efficiency, which was attributed to the improved conductivity by Nb-doping and extended light absorption by CdS sensitization. The well-matched energy band structures of CdS and Ti-Nb-O also contributed to the enhanced overall optical absorption property and separation-transfer properties.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Ming Meng, Yamin Feng, Chunyang Li, Zhixing Gan, Honglei Yuan, Honghui Zhang
Summary: Black 3D-TiO2 nanotube arrays were successfully fabricated on titanium meshes using an electrochemical reduction method. The optimized arrays showed a maximal photocurrent density of 1.6 mA/cm(2) and a Faradic efficiency of 100%, four times higher than that of pristine 3D-TiO2 NTAs. The improved water splitting activity is attributed to the introduction of oxygen vacancies, which shrink the bandgap and enhance visible light utilization.
Article
Chemistry, Physical
Murillo Romero da Silva, Piter Gargarella, Athos Henrique Plaine, Josephine Zeisig, Simon Pauly, Uta Kuehn, Claudemiro Bolfarini
Summary: In this study, the Ti-29Nb-13Ta-4.6Zr-0.070 (TNTZO) alloy was processed by high-pressure torsion (HPT) and its microstructure, phase stability, elastic behavior, mechanical properties, and deformation mechanisms were investigated. An increase in beta-phase stability, significant hardening, and a new reverse martensitic transformation mechanism were observed after severe plastic deformation. The greater hardness was attributed to microstructural refinement, high dislocation density, and stress-induced formation of the omega-phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Yichen Wang, Duo Yu, Jie Yin, Buhao Zhang, Hangfeng Zhang, Xuejian Liu, Yulong An, Michael J. Reece, Zhengren Huang
Summary: The ablation behavior of HEC-0 and the effect of SiC content on ablation resistance were investigated. The results showed that the complex oxide layer played a positive role in reducing the linear ablation rate of HEC-0. The addition of SiC significantly improved the ablation resistance of the composites.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Yihan Wu, Wenshan Yu, Shengping Shen
Summary: In this paper, a supervised machine learning framework powered by the distributed breeder genetic algorithm (DBGA) is proposed to train a charge transfer ionic potential (CTIP) for the multi-component Hf/Nb/Ta/Ti/Zr/O system. The developed potential is rigorously validated and used to study the atomic structure and its evolution in RHEA. The simulation results provide valuable atomistic information and display promising prospects for large-scale reactive simulations.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Physical
Ka-Kin Wong, Hsueh-Chuan Hsu, Shih-Ching Wu, Wen-Fu Ho
Summary: Three nonequiatomic Ti-rich Ti-Zr-Nb-Mo medium-entropy alloys were developed for biomedical applications, exhibiting high yield strength, low elastic moduli, and excellent resilience. The distortion effect caused by alloying atomic radius difference contributed to the superior yield strengths of the alloys. Increasing Ti content can prevent segregation issues and reduce the elastic modulus.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Huang Liu, Jingxi Zhang, Chengshang Zhou, Pei Sun, Yong Liu, Zhigang Zak Fang
Summary: This paper investigates the effect of Nb alloying on the microstructure and hydrogen storage properties of Ti-Fe-Zr-Mn-Nbx alloys. The addition of 2% Nb enables a good combination of the hydrogen capacity and activation property, while Zr-rich phases play a critical role in the activation behavior. However, high Nb addition (> 4%) leads to the reduction of Zr-rich phases and deteriorates the activation kinetics. Nb addition also promotes the formation of the TiFe main phase and increases capacities at ambient temperature. The correlations between microstructure and hydrogen storage performance provide insights into tailoring hydrogen storage properties by alloying TiFe with multi-elements.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Josef Strasky, Dalibor Preisler, Hanus Seiner, Lucie Bodnarova, Michaela Janovska, Tereza Kosutova, Petr Harcuba, Kristian Salata, Kristyna Halmesova, Jan Dzugan, Milos Janecek
Summary: This paper presents an approach for achieving both high strength and low elastic modulus in biomedical titanium alloys by tailoring the alloy composition. The proposed method includes controlled alloying with oxygen for high strength and tailoring the content of beta stabilizing elements for low modulus. The optimized Ti-29Nb-7Zr-0.7O alloy showed promising properties for manufacturing load bearing implants.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Yiwei Zhang, Peng Zhang, Tengfei Xu, Xingguo Wang, Huaning Jiang, Yongji Gong
Summary: Researchers reported a controllable synthesis method for ultrathin two-dimensional TMDCs nanosheets and found that H2S played an important role in controlling their morphology. With the assistance of H2S, the growth of MS2 exhibited thinner thickness and lower nucleation density, which was beneficial for device applications.
CHINESE CHEMICAL LETTERS
(2022)
Article
Chemistry, Physical
Dalibor Preisler, Michaela Janovska, Hanus Seiner, Lucie Bodnarova, Jitka Nejezchlebova, Martin Koller, Petr Sedlak, Petr Harcuba, Jozef Vesely, Jiri Kozlik, Tomas Chraska, Josef Strasky, Milos Janecek
Summary: Compositionally graded samples of Ti-xNb-7Zr-yO alloys with various chemical compositions were prepared and studied for potential biomedical use. The elastic constants of each sample were determined, showing a dependence on the volume fraction of niobium and oxygen. The lowest elastic modulus was observed near the stability limit between β matrix and α'' martensitic phase, while the presence of isothermal ω particles led to the highest elastic constants.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Qingqing Yang, Xingang Wang, Weichao Bao, Ping Wu, Xiaofei Wang, Xiaojie Guo, Cheng Zhang, Guojun Zhang, Danyu Jiang
Summary: The effects of equiatomic Zr/(Ti,Nb) substitution on the microstructure and high-temperature strength of (Ti,Zr,Nb)C medium-entropy ceramics were investigated. Results showed that refining grain size and increasing Zr content can enhance flexural strength at 1900 degrees C.
JOURNAL OF ADVANCED CERAMICS
(2022)
Article
Nanoscience & Nanotechnology
Oren Elishav, David Stone, Anton Tsyganok, Swetha Jayanthi, David S. Ellis, Tamir Yeshurun, Itzhak I. Maor, Adar Levi, Vadim Beilin, Gennady E. Shter, Roie Yerushalmi, Avner Rothschild, Uri Banin, Gideon S. Grader
Summary: This study addresses the effect of particle size on charge transfer in hematite for photoelectrochemical water splitting. The researchers embedded hematite nanoparticles into an electrode substrate to improve contact and enhance performance. The use of nanofibers as a scaffold for the nanoparticles increased the optical density and improved the photocurrent density and photon-to-current internal conversion efficiency by factors of 2 and 10, respectively.
ACS APPLIED MATERIALS & INTERFACES
(2022)
