Article
Engineering, Electrical & Electronic
Meng-Hung Tsai, Chia-Jung Shih, Che-Wei Chang, Yu-Tseng Chu, You-Shen Wu, Cheng-Liang Huang
Summary: In this work, we propose that the band gap of amorphous Nb2O5 thin films can be narrowed, and this concept is validated by fabricating amorphous Nb2O5 based resistive random-access memory devices. The effects of Mn dopants and temperature on the conduction mechanism of the Nb2O5-based devices are investigated, and it is demonstrated that oxygen vacancies dominate the conduction mechanism of Mn-doped Nb2O5-based devices. X-ray photoelectron spectroscopy analysis reveals that the addition of Mn promotes the oxidation of Nb, offering significant benefits for improving the performance of RRAM memory.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Materials Science, Ceramics
Felipe R. Caliari, Eugenio Garcia, Felipe Miranda, Gilberto Petraconi Filho, Sanjay Sampath
Summary: The polymorphism and defect chemistry of Nb2O5 depend on various factors, and plasma spray is a method to form coatings with unique properties that is yet to be fully explored. This study focused on understanding the phase evolution of plasma-sprayed Nb2O5 coatings and its effects on morphology and properties, revealing a complex relationship between plasma parameters and resulting microstructure and properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Elisa Garcia-Lopez, Francesca Rita Pomilla, Bartolomeo Megna, Maria Luisa Testa, Leonarda Francesca Liotta, Giuseppe Marci
Summary: The study found that in the presence of pristine Nb2O5 in water, fructose can be converted to HMF through catalytic dehydration with high yield and selectivity. Optimizing reaction conditions can improve both yield and selectivity, with the best results obtained using 1 g·L-1 of pristine Nb2O5.
Article
Chemistry, Physical
Thais A. Rodrigues, Paulo H. E. Falsetti, Douglas M. S. Del Duque, Gelson T. S. T. da Silva, Osmando F. Lopes, Waldir Avansi, Caue Ribeiro, Vagner R. de Mendonca
Summary: A versatile Nb2O5/SnO2 heterostructure has been successfully synthesized, showing enhanced performance in photocatalysis, CO2 photoreduction, and adsorption compared to pure Nb2O5. The negative surface charge induced by SnO2 and charge separation in the heterostructure extend the lifetime of photoexcited carriers, facilitating oxidative and reductive reactions, making it a unique platform for different environmental treatments.
Article
Nanoscience & Nanotechnology
Guanxu Chen, Jintao Chen, Siyu Zhao, Guanjie He, Thomas S. Miller
Summary: High-rate batteries are crucial for future energy storage systems. This study demonstrates that pseudohexagonal Nb2O5(TT-Nb2O5) has the potential to be used as an anode material in potassium-ion batteries (KIBs), offering high specific capacity, good lifetime, and excellent rate performance when composited with a highly conductive carbon framework. The findings provide a pathway for the scalable production of viable KIB anode material, improving the feasibility of fast-charging KIBs for future applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Ilektra Andoni, Joshua M. Ziegler, Gaurav Jha, Chaitanya Avinash Gadre, Heriberto Flores-Zuleta, Sheng Dai, Shaopeng Qiao, Mingjie Xu, Vivian T. Chen, Xiaoqing Pan, Reginald M. Penner
Summary: The study reveals a reproducible degradation process of Nb2O5 films after lithiation/delithiation cycling, with irreversible capacity loss occurring after 1000 cycles and stabilization of Csp after 9000 cycles. The research indicates that the decline in capacity is concurrent with an increase in charge transfer resistance, loss of crystalline order, and dissolution of niobium from the film.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Lei Wang, Fei Huang, Guoyin Zhu, Zhihui Dai
Summary: A one-step solid-state synthesis method was used to prepare orthogonal Nb2O5 nanocrystals/graphene composites as high-performance anode materials in lithium-ion batteries. The Nb2O5/G material showed excellent electrochemical performance due to its nanoscale crystalline structure and highly conductive graphene substrate. A reversible structural phase transition between orthogonal Nb2O5 and tetragonal Li1-xNbO2 was verified, and the Nb2O5/G||graphite dual-ion batteries exhibited good cyclic performance and rate capability.
Article
Chemistry, Physical
Kuan Wang, Dan Wang, Xiao-Yong Zhang, Junlei Wang, Sheng-Li Lv, Zhen-Hong He, Huan Wang, Weitao Wang, Yang Yang, Zhao-Tie Liu
Summary: A series of modified N-doped Nb2O5 catalysts were prepared by using a modular calcination strategy combining hydrogen, vacuum, air, and ammonia modules. Among these modified catalysts, HN-Nb2O5 showed the best photocatalytic performance for the photo-oxidation of cyclohexane. The outstanding performance can be attributed to the abundant chemical defects of oxygen vacancies and Nb4+, as well as the presence of NOx species, which enhanced light absorption and effective electron-hole separation.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Renjing Huang, Ohhun Kwon, Chao Lin, Raymond J. Gorte
Summary: The study compared the HDO of m-cresol using Pt/Nb2O5/MgAl2O4 and Pt/TiO2/MgAl2O4 catalysts, finding that Pt/Nb2O5/MgAl2O4 catalyst showed better coke tolerance and higher selectivity towards toluene production than Pt/MgAl2O4.
JOURNAL OF CATALYSIS
(2021)
Article
Electrochemistry
Evangeline C. Wheeler-Jones, Melanie J. Loveridge, Richard I. Walton
Summary: A composite of Nb2O5 and MoO2 was synthesized and demonstrated as a high-capacity, high-rate anode for lithium-ion batteries. The composite showed an intimate mix of individual oxide particles, and a ratio of Nb : Mo of 45: 55. It exhibited notable rate capability and achieved a stable reversible capacity of 514 mAh g(-1), realizing its theoretical capacity.
BATTERIES & SUPERCAPS
(2023)
Review
Chemistry, Physical
Rui Pang, Zhiqiang Wang, Jinkai Li, Kunfeng Chen
Summary: This article reviews the basic properties, crystal structures, synthesis methods, and applications of Nb2O5, an important dielectric and semiconductor material. Nb2O5 has numerous crystal polymorphs and excellent electrical properties, making it a research hotspot for potential applications in lithium-ion batteries (LIBs) and supercapacitors (SCs).
Article
Nanoscience & Nanotechnology
Shimul Kanti Nath, Sanjoy Kumar Nandi, Thomas Ratcliff, Robert Glen Elliman
Summary: Two metal-oxide-metal devices based on niobium oxide thin films exhibit non-linear electrical characteristics with applications in neuromorphic computing. Doping is shown to improve device reliability and allows for tuning of various characteristics, such as threshold voltage and negative differential resistance. Temperature-dependent current-voltage characteristics and modelling suggest that doping-induced reductions in resistance and thermal activation energy play a role in engineering device response.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Tongtong Li, Shengchi Huang, Nicholas Kane, Jeng-Han Wang, Zheyu Luo, Weilin Zhang, Gyutae Nam, Bote Zhao, Yabing Qi, Meilin Liu
Summary: This study investigates the correlation between the structural evolution of Nb2O5 and its electrochemical properties during lithiation through in situ Raman spectroscopy. The lithium storage mechanism is unraveled using DFT calculations, including adsorption site preference, electronic structure, and specific pathways for lithium transport. This work provides important insights for the design of high-rate lithium storage materials based on niobium compounds.
ACS ENERGY LETTERS
(2023)
Article
Polymer Science
M. Afifi, Mehrez E. El-Naggar, Shabbir Muhammad, Noweir Alghamdi, S. Wageh, Manal F. Abou Taleb, Mervat S. Mostafa, Salem Salem, Ibrahim El-Tantawy
Summary: Hydroxyapatite, niobium pentoxide, and graphene oxide were combined into a ternary nanocomposite with multifunctionality including antibacterial activity and biocompatible properties. The structure and surface morphology of the composite were analyzed using X-ray diffraction, scanning electron microscope, and transmittance electron microscope. The dimensions of the nanorods and spherical particles as well as the surface roughness were measured. In vitro experiments on osteoblast cell lines showed increased cell viability and inhibition zones for E. coli and S. aureus bacteria. These findings suggest that the composite has potential for biomedical applications.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
B. Sotillo, R. Ariza, P. Fernandez, J. Solis
Summary: This work presents the production of Nb2O5 layers with greatly improved electrical properties using the ultrafast-laser powder bed fusion process. The study identifies the optimal conditions for producing uniform and compact Nb2O5 layers from powder material. It is found that ultrafast-laser irradiation in air at room temperature results in the formation of dense Nb2O5 layers with high temperature monoclinic crystal structure (H-Nb2O5) that is oxygen-deficient. The preferential crystal orientation of the monoclinic structure in the layers can be controlled by the laser irradiation conditions. The induced microstructure causes anisotropic resistivity, while the overall material resistivity is significantly reduced due to the oxygen deficiency. These findings demonstrate the feasibility of utilizing ultrafast laser processing to achieve high-temperature non-stoichiometric niobium oxide phases rapidly and with low energy consumption. The highly improved electrical properties of the laser irradiated Nb2O5 layers hold great potential for various electronic and sensing applications.
MATERIALS & DESIGN
(2022)