Article
Chemistry, Physical
Davina Messou, Vincent Bernardin, Frederic Meunier, Marta Borges Ordono, Atsushi Urakawa, Bruno F. Machado, Vincent Colliere, Regis Philippe, Philippe Serp, Carole Le Berre
Summary: The catalytic performances of TiO2-supported Ni catalysts for the methanation of CO2 are investigated, showing that the crystalline phases of TiO2 significantly affect the activity of Ni. Mixing rutile and anatase TiO2 can increase the reaction rate significantly without direct contact between the two catalysts. The synergy between the two catalysts is attributed to hydrogen spillover mediated by surface or gas-phase species.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Pritha Biswas, Tamara D. Koledin, Skylar N. Farmer, Melissa K. Santala, Janet Tate
Summary: The transformation from amorphous to crystalline in TiO2 films in air leads to different polymorphs, which can be manipulated by introducing Sn into the system. Sn stabilizes the rutile structure at the Sn/TiO2 interfaces by scavenging oxygen, resulting in rutile formation.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Engineering, Chemical
Szu-Nung Kao, Ying-Chieh Hung, Yusuke Shimoyama, Chieh-Ming Hsieh, Bor Kae Chang
Summary: Recent research has shown a growing interest in developing titanium dioxide (TiO2) based anodes for lithium ion batteries due to their high theoretical specific capacity, safety, chemical stability, and abundance. Niobium-doped (Nb-doped) TiO2 anodes have been proposed and shown to improve cycling stability and performance in lithium ion batteries. The study used first principles calculations to reveal the mechanism behind the superior performance of Nb-doped TiO2 compared to pristine TiO2, showing improved lithium intercalation process and electronic conductivity.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Chemistry, Applied
P. Rychtowski, B. Tryba, D. Baranowska, B. Zielinska, H. Nishiguchi, M. Toyoda
Summary: Reduction of TiO2 has been studied under different conditions. The addition of ammonia solution followed by hydrothermal treatment and calcination in Ar resulted in the formation of surface defects such as hole traps and oxygen vacancies in the reduced TiO2. Heat-treatment under hydrogen gas produced the highest amount of reduced Ti3+ centers, leading to improved water splitting and enhanced photocatalytic properties. Hydrogen was found to be a stronger reducing agent than ammonia gas.
Article
Chemistry, Physical
Lei Wang, Xudong Liu, Mu Zhang, Xiaoguo Bi, Zhixin Ma, Jinsheng Li, Jialin Chen, Xudong Sun
Summary: (Nb0.5Ga0.5)(x)Ti1-xO2 single crystals with different doping amounts were prepared by Verneuil method. The crystals showed varying dielectric performance, with the best dielectric properties achieved at a doping amount of 0.5%. The colossal permittivity properties were attributed to EPDD polarization, and higher doping concentrations led to slight increases in dielectric loss. The results highlight the significance of TiO2 crystal materials with lower dielectric loss for the development of dielectric materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Maria J. Sampaio, Zhipeng Yu, Joana C. Lopes, Pedro B. Tavares, Claudia G. Silva, Lifeng Liu, Joaquim L. Faria
Summary: Calcination treatments of TiO2 synthesised by the sol-gel method in the range of 500-900°C resulted in materials with variable physicochemical and morphological properties, with the best water oxidation performance achieved at 700°C. Photocatalysts with higher anatase to rutile ratio and surface density of oxygen vacancies displayed the best OER performance, with oxygen defects at the catalyst surface responsible for enhanced photoactivity. Immobilising the photocatalyst with the highest OER rate (TiO2-700) demonstrated remarkable efficiency for oxygen production under continuous mode, exceeding 12% AQE at 384 nm.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Applied
Vladimir Paunovic, Marcos Rellan-Pineiro, Nuria Lopez, Javier Perez-Ramirez
Summary: This article investigates the activity of TiO2-rutile and TiO2-anatase polymorphs in the catalytic HBr oxidation, with the results showing that rutile exhibits higher activity than anatase, indicating that HBr oxidation follows a defect-driven mechanism.
Article
Engineering, Electrical & Electronic
Yang Ren, Haiyan He, Yunwei Wang, Ying Gong, Gaoyang Zhao
Summary: In this study, F-Nb co-doped TiO2 films were prepared using the sol-gel method. Multielement doping was used to enhance the conductivity of the films, leading to optimal optoelectronic properties when the F:Ti atomic ratio is 0.5:1.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Guangri Jia, Ying Wang, Xiaoqiang Cui, Hengzhong Zhang, Jingxiang Zhao, Lu Hua Li, Lin Gu, Qinghua Zhang, Lirong Zheng, Jiandong Wu, Qiong Wu, David J. Singh, Weiwei Li, Lei Zhang, Weitao Zheng
Summary: The introduction of hydrogen into TiO2 greatly enhances its photocatalytic properties, leading to a 60 times enhancement of photocatalytic hydrogen evolution activity. Hydrogenated TiO2 with switchable defects is synthesized through a one-step wet-chemistry method and controlled annealing. The obtained hydrogenated TiO2 exhibits improved visible light absorption and efficient separation of photogenerated carriers, resulting in significantly enhanced photocatalytic activity.
Article
Materials Science, Multidisciplinary
Muhammed Fasil Puthiyaparambath, Raghu Chatanathodi
Summary: This paper presents a systematic modeling study on the effect of Nb doping on the ORR activity of anatase TiO2. The results show a significant enhancement in the catalytic activity of TiO2 upon Nb doping at low concentrations. Additionally, the study finds that solvation can further improve the binding capability of oxygen and other reaction intermediates, leading to lower activation barriers.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Yubin Liu, Xiaoyang Pan, Wenjie Chen, Xiaojing Zhao
Summary: In this study, Nb-doped TiO2 nanoparticles were successfully synthesized using a facile method and characterized by various techniques. The results showed that the Nb-doped TiO2 exhibited improved lithium-ion storage properties in lithium-ion batteries, which may be attributed to the enhanced conductivity due to Nb doping.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Physical
M. T. Colomer, E. Rodriguez, M. Moran-Pedroso, F. Vattier, A. de Andres
Summary: Novel Tb-doped TiO2 hollow spheres (HSs) have been synthesized for the first time in the range of 0.0-2.0 at.%, revealing a significant impact of Tb presence and morphology on the anatase-to-rutile transition temperature. Contrary to expectations, Tb doping reduces the transition temperature and favors rutile phase formation in HSs. XPS measurements confirm the presence of Tb3+ and Tb4+ in both HSs and NPs, with Tb4+ contributing to weakened f-f emission intensity and destabilization of the anatase phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Environmental Sciences
Selda Sezer, Aysegul Yucel, Duygu Ozhan Turhan, Fatma Bilge Emre, Musa Sarikaya
Summary: Titanium dioxide is widely used in commercial and industrial areas such as paint, paper, cosmetics, textiles, and surface coating due to its anti-corrosion and high stability properties. However, research has been conducted to investigate its potential carcinogenic effects in humans. This study aims to compare the toxicity of different phases of titanium dioxide used in various fields.
Article
Chemistry, Multidisciplinary
Richard G. Haverkamp, Peter Kappen, Katie H. Sizeland, Kia S. Wallwork
Summary: The niobium-doped titanium dioxide is a conductive material with various new energy applications. In this study, we investigated the structure of niobium-doped anatase and rutile produced from ilmenite digested in hydrochloric acid using Nb K-edge X-ray absorption techniques. The results showed clear structural differences between niobium-doped anatase and rutile, and the niobium occupied a titanium site with no near neighbors of niobium.
Article
Physics, Applied
Nhan V. Nguyen, Nam Nguyen, Jason R. Hattrick-Simpers, Oleg A. Kirillov, Martin L. Green
Summary: Transparent conducting oxides have high optical transmittance and are electrically conductive, with differences in optical responses between materials such as TiO2, ZnO, and SnO2. The bandgap and electronic characteristics were determined and discussed in this study.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)