Article
Chemistry, Multidisciplinary
Zineb Matouk, Mohammad Islam, Monserrat Gutierrez, Jean-Jacques Pireaux, Amine Achour
Summary: The impact of a titania (TiO2) support film surface on the catalytic activity of gold nanoparticles (Au NP) was investigated. Different crystal structures and treatments of TiO2 films were found to affect the catalytic activity of Au NP. Adsorption of Au NP on TiO2 films was observed, and the adsorption extent increased with increasing Au NP loading.
Article
Chemistry, Physical
Harok Jeong, Sangmin Park, Junghoon Yang, Hye-Min Lee, Sangmin An, Yasuhiro Yamada, Jungpil Kim
Summary: Through simulation and experimental verification of XPS and Raman spectra of zigzag NBs, armchair NBs, and NHs, it was found that they have significant differences in spectral characteristics, so NBs and NHs can be distinguished using XPS and Raman spectroscopy.
Article
Materials Science, Ceramics
J. Leon-Flores, J. L. Perez-Mazariego, S. S. Flores-Morales, R. Hinojosa, E. P. Arevalo-Lopez, R. Escamilla, R. W. Gomez
Summary: Polycrystalline samples of iron bismuth antimony pyrochlore and iron bismuth tantalum pyrochlore were synthesized using the molten salts method. Their crystalline structures were determined by X-ray diffraction and their optical properties were investigated using spectroscopic techniques.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
G. Hannah Priya, A. Alinda Shaly, J. Mary Linet
Summary: In this study, TiO2/ZnS nanocomposites were prepared using a one-step hydrothermal method, with varying zinc content affecting the crystalline size. Among different zinc quantities, the molar ratio of Zn at 0.25 showed the highest photocatalytic degradation efficiency in the TiO2/ZnS nanocomposite.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Alwani Imanah Rafieh, Piyasiri Ekanayake, Hideki Nakajima, Abdul Hanif Mahadi, Masanizan Abu, Muna Fathiah Don, Chee Ming Lim
Summary: Doping calcium and lanthanum into mesoporous TiO2 prevents particle nucleation and growth during high temperature synthesis and calcination, resulting in smaller particle sizes and a reduced band gap of TiO2. This enhances the efficiency of dye-sensitized solar cells (DSSCs) as anodes and increases dye adsorption concentration. Moreover, the presence of calcium and lanthanum dopants in TiO2 nanoparticles is confirmed, and doping with these elements improves overall device efficiency through increased surface area and oxygen vacancies.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
T. M. W. J. Bandara, H. M. N. Wickramasinghe, K. Wijayaratne, L. Ajith DeSilva, A. A. Perera
Summary: Dye-sensitized solar cells (DSCs) have been developed as a low-cost alternative for energy conversion devices, with a focus on reducing the use of expensive platinum. This study investigated new composite counter electrodes based on graphite and TiO2 nanoparticles, showing that the highest solar cell performance was achieved with an 80 wt% graphite and 20 wt% TiO2 composition.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
A. Kumari, W. W. Tjiu, Z. Aabdin, J. Roy, V. K. Verma, A. Kandasami, V. R. Singh
Summary: In this study, the effects of Co-doping and high-temperature annealing on the structural, optical, and electronic characteristics of TiO2 nanoparticles were investigated. The results showed that Co-doping and annealing can affect the grain size, phase composition, and electronic states of the nanoparticles. These findings are significant for improving the performance of TiO2 nanoparticles.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Environmental
Kosuke Ono, Koji Kimura, Tatsuya Kato, Kouichi Hayashi, Rajapakse M. G. Rajapakse, Masaru Shimomura
Summary: In this study, a simple and economical solvothermal method was used to grow epitaxial anatase TiO2 thin films on a LaAlO3 substrate, and the doping substitution was observed using X-ray fluorescence holography.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Manveen Kaur, Sanjeev Kumar, Rajwant Singh, N. K. Verma, Vanish Kumar, Sherif A. Younis, Ki-Hyun Kim
Summary: Solar energy is a promising replacement for depleting fossil fuels. In this study, unconventional N719 dye-sensitized solar cells based on Tb2O3@TiO2 nanoparticles were fabricated. The photovoltaic performance of these cells was evaluated and compared to a pristine TiO2 photoanode. Results showed a 22% improvement in efficiency for the Tb2O3@TiO2 photoanode compared to TiO2. The enhanced properties of Tb2O3@TiO2, such as high adsorption capability and photocurrent density, make it recommended for achieving efficient solar energy conversion.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Thermodynamics
Manoel Y. Manuputty, Casper S. Lindberg, Jochen A. H. Dreyer, Jethro Akroyd, John Edwards, Markus Kraft
Summary: The study explores the relative stability of anatase and rutile in stagnation flame synthesis with stoichiometric mixtures. It shows high sensitivity of anatase-rutile composition to flame dilution and discusses two formation mechanisms/pathways. By applying a particle model and a phase transformation model, it is found that anatase formation is favored in more dilute flames while rutile is favored in less dilute flames.
COMBUSTION AND FLAME
(2021)
Article
Materials Science, Multidisciplinary
Atsushi Hariki, Keisuke Higashi, Tatsuya Yamaguchi, Jiebin Li, Curran Kalha, Manfred Mascheck, Susanna K. Eriksson, Tomas Wiell, Frank M. F. de Groot, Anna Regoutz
Summary: This paper explores the satellites of the Ti 1s and 2p core level spectra of SrTiO3 and TiO2 using hard x-ray PES. The theoretical analysis emphasizes the importance of higher-order Ti-O charge-transfer processes and provides a robust prescription for using the computationally cheap cluster model in fitting analyses of core level spectra.
Article
Chemistry, Physical
Mohammad Faisal, Jin-Yoo Suh, Young-Su Lee
Summary: The study confirms that Zr-added TiFe alloy is easily activated at room temperature, forming ternary phases that aid hydrogen storage. These ternary phases can store 1.8-1.9 wt% of hydrogen, demonstrating their potential as hydrogen storage materials.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
J. Theo Kloprogge, Concepcion P. Ponce, Danilo O. Ortillo
Summary: XPS analysis of layered clay systems with intercalated inorganic and organic compounds reveals valuable insights into the structure, coordination, and oxidative transformations of these compounds. By studying the shifts in binding energies and multiplet splitting, XPS can track changes in oxidation states and coordination environments within the materials.
Article
Chemistry, Multidisciplinary
Jiaxu Li, Dengshuai Wei, Qinrui Fu
Summary: This study proposes an innovative solution for photodynamic therapy of cancer by compounding a zwitterionic covalent organic polymer (COP) with a TiO2 photosensitizer. The nanocomposite exhibited enhanced photodynamic therapy effect for drug-resistant cancer cells and potential application in cancer diagnosis through fluorescence imaging.
Article
Chemistry, Physical
Irene Ferrari, Alessandro Motta, Robertino Zanoni, Francesca Anna Scaramuzzo, Francesco Amato, Enrique A. Dalchiele, Andrea Giacomo Marrani
Summary: This study investigates the nature and interactions of oxygen functional groups in graphene oxide, providing insights into their electrochemical reduction energetics. Chemical modifications of graphene oxide under controlled electrochemical reduction conditions were studied to understand the contribution of single reactive oxygen functional groups. X-ray photoelectron spectroscopic analysis and theoretical modeling were used to characterize the various carbonaceous species involved in the rich chemistry of graphene oxide.
Article
Engineering, Chemical
Francois Larouche, Frederic Voisard, Kamyab Amouzegar, Georges Houlachi, Patrick Bouchard, Ashok Vijh, George P. Demopoulos
Summary: Orthorhombic LiFePO4 (LFP) is a reversible cathodic material for lithium-ion batteries. A green delithiation process for LFP recycling based on CO2 and hydrogen peroxide is optimized with a temperature of 20 degrees C, a CO2 pressure of 2 atm, and a H2O2 to LFP molar ratio of 1.25. The reaction mechanism is controlled by nucleation and growth, with CO2 acting as a buffering agent to neutralize LiOH formation.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Rana Yekani, Hsien-chieh Chiu, Dallas Strandell, Zhuoran Wang, Stephanie Bessette, Raynald Gauvin, Patanjali Kambhampati, George P. Demopoulos
Summary: This study investigates the origin of inductance and its relationship with hysteresis in hybrid perovskite solar cells (PSCs) using two different electron transport layer (ETL) structures. The results show that the ETL plays a significant role in determining the migration speed of ions and subsequent accumulation. Additionally, the conductivity of the transport layers influences both the inductive features and the region of recombination, ultimately affecting the hysteresis locus.
Article
Multidisciplinary Sciences
Jianwen Liang, Yuanmin Zhu, Xiaona Li, Jing Luo, Sixu Deng, Yang Zhao, Yipeng Sun, Duojie Wu, Yongfeng Hu, Weihan Li, Tsun-Kong Sham, Ruying Li, Meng Gu, Xueliang Sun
Summary: Layered oxide cathode active materials suffer from interfacial structural instability when coupled with sulfide solid-state electrolytes. Here, the authors propose a gradient coating with a lithium oxythiophosphate layer that can stabilize the cathode|solid-state electrolyte interface. This coating effectively hinders structural degradation and allows for a specific discharge capacity of 128mAh/g after almost 250 cycles.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Natasha Arshad, Muhammad Usman, Muhammad Adnan, Muhammad Tayyab Ahsan, Mah Rukh Rehman, Sofia Javed, Zeeshan Ali, Muhammad Aftab Akram, George P. Demopoulos, Asif Mahmood
Summary: Designing multifunctional nanomaterials for high performing electrochemical energy conversion and storage devices has been challenging. The researchers in this study reported the fabrication of a reduced graphene oxide-based ternary composite NiO/MnO2/rGO (NMGO) that had a range of active sites for enhanced electrochemical activity. The modified structure exhibited high conductivity, excellent charge storage capacity, and stability. The NMGO//MWCNT asymmetric device demonstrated good energy density, excellent power density, and capacitance retention.
Article
Soil Science
Zidan Yuan, Jinru Lin, Yuanming Pan, Yongfeng Hu, Jiaxi Zhang, Mohsen Shakouri, Ning Chen, Roman Chernikov, Eli Wiens, Yongfeng Jia
Summary: In this study, it was found that the presence of nitrate media facilitates the immobilization of As(III) by Fe(III). The optimal nitrate concentration for As(III) fixation was 44,640 mg center dot L-1, resulting in the removal of 60.3-87.9% of As(III).
Article
Green & Sustainable Science & Technology
Fahimeh Esmi, Ajay K. Dalai, Yongfeng Hu
Summary: Functionalized mesoporous aluminosilicates were synthesized using two different techniques of post and direct functionalization. Heteropoly acid was immobilized on the carriers and their performance for transesterification reaction was studied. The catalysts were analyzed for their properties and the direct functionalized catalyst with amino group showed higher catalytic activity and reusability compared to the one with thiol group.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Yongqing Bai, Zonglun Cao, Yongfeng Hu, Jing Zhao, Huaihao Zhang
Summary: In this study, a thermoconductive lignin-based hydrogel CaLS-CTS/h-BN was designed and synthesized for thermal energy conservation and soil self-remediation in thermal recovery of heavy oil. The gel improved the thermal efficiency and cumulative oil-steam ratio of steam flooding, reduced input energy, and enhanced heating profile and heat transfer. It also facilitated the biodegradation of the gel, alleviated formation damage, and increased the degradation of petroleum pollutants in soil. Additionally, it chelated and immobilized heavy metal contaminants in oilfield soil. This study provided a green adjuvant agent for cleaner production of heavy oil.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Priya Karna, Zou Finfrock, Junjie Li, Yongfeng Hu, Dong-Sheng Yang
Summary: Copper has been widely used as a cost-effective and environmentally friendly metal catalyst in cross-coupling reactions. This article presents a water-soluble active molecular catalyst for Suzuki-Miyaura cross-coupling reactions using copper iodide as the precatalyst. The catalyst, identified as Cu(OH) in its singlet electronic state, is stable for at least 4 weeks in aqueous solutions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Multidisciplinary Sciences
Huai Chen, Yangyang Xiong, Jun Li, Jehad Abed, Da Wang, Adrian Pedrazo-Tardajos, Yueping Cao, Yiting Zhang, Ying Wang, Mohsen Shakouri, Qunfeng Xiao, Yongfeng Hu, Sara Bals, Edward H. H. Sargent, Cheng-Yong Su, Zhenyu Yang
Summary: This study reports an epitaxial growth method to construct Co single atoms on Si for light-driven CO2 reduction to syngas. By improving the dispersion of active sites and the efficient harvest of photons, the cobalt-on-silicon single-atom catalysts achieved a 10% external quantum efficiency for CO2-to-syngas conversion, with tunable H2/CO ratio between 0.8 and 2. This photocatalyst also achieved a turnover number of 2 x 10(4) for visible-light-driven CO2 reduction over 6 hours, which is over ten times higher than previously reported single-atom photocatalysts.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Jie Xia, Lin Dong, Xiaohui Liu, Roman Chernikov, Mohsen Shakouri, Yongfeng Hu, Yong Guo, Jianjian Wang, Kepeng Song, Peijun Hu, Yanqin Wang, Haifeng Wang
Summary: We report a single-atom Au1/Nb2O5 catalyst for the hydrodeoxygenation of methylcatechol. The catalyst shows stability in five consecutive conversions. The presence of oxygen vacancies in Au@Nbv-2Ov facilitates the adsorption of methylcatechol and enhances the efficiency of C-O bond cleavage.
Article
Chemistry, Multidisciplinary
Hongxin Pan, Baorun Ma, Lihui Zhou, Yongfeng Hu, Mohsen Shakouri, Yong Guo, Xiaohui Liu, Yanqin Wang
Summary: CuPd0.1/gamma-Al2O3 catalyst exhibited excellent activity in CO2 hydrogenation to methanol, which was attributed to the highly dispersed Pd species and the increased Cu+/(Cu++Cu) ratio. However, CH3OH retained on the catalyst surface could be further reformed into CO, leading to a decrease in the selectivity of methanol.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Energy & Fuels
Fahimeh Esmi, Ajay K. Dalai, Yongfeng Hu
Summary: Biodiesel synthesis was conducted using a non-edible feedstock obtained from green seeds of canola oil and a 12-tungstophosphoric heteropoly acid supported mesoporous aluminosilicate catalyst. The effects of catalyst loading, methanol to oil molar ratio, and reaction time on biodiesel yield were studied using response surface methodology. The highest biodiesel yield of 89% was obtained at optimum reaction conditions. Kinetic study revealed a pre-exponential factor of 9.1 x 102 min-1 and an activation energy of 36.34 kJ/mol.
Article
Geochemistry & Geophysics
Wenshuai Li, Ryoichi Nakada, Yoshio Takahashi, Richard M. Gaschnig, Yongfeng Hu, Mohsen Shakouri, Roberta L. Rudnick, Xiao-Ming Liu
Summary: This study investigates the secular change in the geochemical composition of cerium in the upper continental crust (UCC) for tracing oxidative weathering. The results show that there are no distinguishable secular changes in the cerium anomaly and stable isotope composition of the average UCC. The study emphasizes the importance of utilizing the valence state of cerium as a reliable indicator of redox conditions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Green & Sustainable Science & Technology
Yongqing Bai, Jiren Tian, Yongfeng Hu, Jing Zhao, Huaihao Zhang
Summary: In order to achieve cleaner production of heavy oil with lower fossil fuel consumption, research on solar thermal enhanced oil recovery (Solar TEOR) technologies has been increasing. However, the intermittent nature of solar radiation and the low energy efficiency of steam flooding have limited the industrial applications of Solar TEOR methods. This study synthesized a thermal energy storage biogel (NaCl-KCl)@G/MC with high thermal conductivity and latent heat storage capacity to improve the continuity of solar thermal supply and energy efficiency of steam flooding.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Siyu Wang, Xinran Ning, Xiaohui Liu, Mohsen Shakouri, Yongfeng Hu, Haiyang Yuan, Pengfei Liu, Xunyu Lu, Yong Guo, Yanqin Wang
Summary: This study reports a novel HER catalyst with oxygen-rich nitrogenated carbon synthesized from renewable lignin and low-cost melamine as the catalyst support. The catalyst exhibits low overpotential and excellent stability, demonstrating the crucial role of oxygen in nitrogenated carbon for HER and providing a strategy for developing high-efficient HER catalysts.