Article
Chemistry, Physical
Diana Peltzer, John Munera, Laura Cornaglia
Summary: Li2ZrO3, K-doped Li2ZrO3, and mixed Li2ZrO3-Na2ZrO3 based sorbents were synthesized via wet impregnation method and their structural, performance, and reactivity were characterized. The addition of water was found to improve the capture properties, while also impacting the regeneration efficiency, with KLiZr showing better stability than NaLiZr. The study suggests that water enhances the reactivity of alkali zirconates by increasing ionic mobility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Nicolas Gabriel Orsetti, Martina Gamba, Sofia Gomez, Juan Pablo Yasno, Gustavo Suarez
Summary: In the current global environmental paradigm, lithium zirconate-based materials (LZOs) are of great technological interest in reducing the carbon footprint. They have various applications including tritium breeding ceramics, CO2 capture and industrial reuse, nanocoatings for lithium-ion and solid-state batteries, and catalytic materials for biodiesel and air-hydrogen fuel cells.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Jana Weiss, Qingxin Yang, Ursula Bentrup, Evgenii Kondratenko, Angelika Brueckner, Christoph Kubis
Summary: Hematite can be used as a precursor for catalytically active iron (oxide) phases in CO2 Fischer-Tropsch synthesis. The transformation from alpha-Fe2O3 to Fe3O4 is faster than further reduction to Fe (metallic iron) in a hydrogen atmosphere, with the rate depending on temperature. Surface formate species are formed at elevated temperatures in a CO2/H2 gas mixture, while exposure to CO2 and CO leads to surface carbonate-carboxylate species. Reduced samples with varying Fe3O4 and Fe contents did not show observable adsorbates under reaction conditions. Carbonaceous species, indicating carbidation, were observed for a catalyst with medium reduction degree.
Article
Chemistry, Multidisciplinary
Thimo S. Jacobs, Thomas P. van Swieten, Sander J. W. Vonk, Isa P. Bosman, Angela E. M. Melcherts, Bas C. Janssen, Joris C. L. Janssens, Matteo Monai, Andries Meijerink, Freddy T. Rabouw, Ward van der Stam, Bert M. Weckhuysen
Summary: This study investigates the local temperature variations in carbon dioxide methanation over a TiO2-supported Ni catalyst and links them to catalytic performance. Luminescence thermometry is used to measure the temperature-dependent emission and extract local temperatures. The findings highlight the importance of understanding and controlling temperature variations for optimizing catalyst performance.
Article
Nanoscience & Nanotechnology
Hui Xu, Justin Easa, Sarah G. Pate, Renxi Jin, Casey P. O'Brien
Summary: This work describes a new operando surface enhanced Raman spectroscopy (SERS) platform that enables the direct correlation of membrane structure to its performance under realistic operating conditions. It also establishes the mechanism of CO2 facilitated transport across polyvinylamine (PVAm) and provides a new operando SERS platform for a wide range of polymer membrane systems.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Tanja Traini, Duccio Tatini, Elisa Rossi, Gianluca Ciancaleoni, Pierandrea Lo Nostro
Summary: By investigating the molecular structure and adsorption capacity of a low temperature transition mixture (LTTM), the properties of the absorbing material can be optimized for the development of reusable carbon capture systems. The LTTM, composed of ethylene glycol, potassium hydroxide, and boric acid (3:1:1), can effectively absorb CO2 at room temperature and release it through boric acid catalysis.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Ceramics
Luis A. Salazar Hoyos, Betina M. Faroldi, Laura M. Cornaglia
Summary: K-doped lithium silicates were synthesized as CO2 sorbents using rice husks as silica source by two different doping methods, showing noticeable differences between the samples obtained. An improvement in capture efficiency was observed in the doped samples, especially at low temperature and CO2 partial pressure. The study of kinetics and operando spectroscopies allowed for the proposal of a transformation mechanism during the sorption step, highlighting the enhancement of surface reaction and volumetric diffusion processes in the CO2 capture process.
CERAMICS INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Yao Yang, Sheena Louisia, Sunmoon Yu, Jianbo Jin, Inwhan Roh, Chubai Chen, Maria V. Fonseca Guzman, Julian Feijoo, Peng-Cheng Chen, Hongsen Wang, Christopher J. Pollock, Xin Huang, Yu-Tsun Shao, Cheng Wang, David A. Muller, Hector D. Abruna, Peidong Yang
Summary: This study presents a comprehensive investigation of the structural dynamics of Cu nanocatalysts during the electrochemical synthesis of fuels and chemicals. The presence of active Cu nanograins under CO2 reduction conditions and their role in supporting C-C coupling reactions were observed. Quantitative structure-activity correlation revealed that a higher fraction of Cu nanograins leads to higher selectivity for C2+ products. This research provides a powerful platform for advancing our understanding of the complex structural evolution of nanocatalysts under electrochemical conditions.
Article
Nanoscience & Nanotechnology
Eibar Flores, Nataliia Mozhzhukhina, Ulrich Aschauer, Erik J. Berg
Summary: In this study, the insulator-metal transition of LiCoO2 was investigated using operando Raman spectroscopy, DFT calculations, and a sample volume model. It was found that LCO follows a two-phase transition route at low cycling rates, but a solid-solution transition route is favored at higher rates, explaining its competitive rate capabilities. The research provides unique insights into fundamental processes governing the performance of state-of-the-art cathode materials for Li-ion batteries.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Review
Chemistry, Physical
Lanxin Xue, Yaoyao Li, Anjun Hu, Mingjie Zhou, Wei Chen, Tianyu Lei, Yichao Yan, Jianwen Huang, Chengtao Yang, Xianfu Wang, Yin Hu, Jie Xiong
Summary: This article summarizes the recent applications of in situ/operando Raman techniques for monitoring the real-time variations in Li-S batteries, aiming to reveal the reaction mechanism and guide the design of strategies for improving battery performances.
Article
Chemistry, Multidisciplinary
Wenjun Wang, Zhu Mao, Yanyu Ren, Fanxu Meng, Xiumin Shi, Bing Zhao
Summary: The built-in potential field of the NiO/TiO2 interface in the photodetectors decreases the charge transfer resistance and changes the vibrational frequency of TiO2's phonon modes, which enhances the responsiveness of the photodetectors. Operando Raman spectroscopy has been proven to be a powerful tool for manufacturing highly responsive photodetectors.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Yun-Yang Lee, Nalinda P. Wickramasinghe, Ruth Dikki, Darrell L. Jan, Burcu Gurkan
Summary: This study developed a facilitated transport membrane (FTM) using functionalized ionic liquid (IL) and poly(ionic liquid) (PIL) carriers to separate CO2 from air. The results showed that the membrane achieved efficient CO2 separation under certain conditions. Additionally, the study analyzed the effects of carrier binding to CO2, ion diffusivities, and gel glass transition temperature on membrane performance.
Article
Chemistry, Multidisciplinary
Daxian Cao, Xiao Sun, Fei Li, Seong-Min Bak, Tongtai Ji, Michael Geiwitz, Kenneth S. Burch, Yonghua Du, Guochun Yang, Hongli Zhu
Summary: The reaction mechanism of sulfur (S-8) in all-solid-state lithium-sulfur batteries (ASLSBs) was investigated through operando Raman spectroscopy and ex situ X-ray absorption spectroscopy. It was found that no Li2S8, Li2S6, and Li2S4 were formed, but Li2S2 was detected. First-principles structural calculations revealed the formation energy of solid state Li2Sn (1=n=8), where Li2S2 was a metastable phase consistent with experimental observations. Partial S-8 and Li2S2 remained at the full lithiation stage, indicating incomplete reaction due to sluggish kinetics in ASLSBs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Environmental
Eleonora Stefanelli, Sandra Vitolo, Monica Puccini
Summary: A novel single-step method for fabricating macro-porous K2CO3-doped Li4SiO4 pellets for CO2 capture at high temperature and low concentration of CO2 is proposed in this study. The obtained pellets showed high CO2 sorption capacity and good cycling stability.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Materials Science, Characterization & Testing
H. Okubo, K. Kobayashi, D. Iba, I Moriwaki, S. Yao, S. Sasaki
Summary: This study used time-resolved ex situ Raman and FT-IR spectroscopy to monitor structural changes in a PA66 gear during operation and revealed the failure mechanisms of the material.
Article
Engineering, Environmental
D. Peltzer, J. Munera, L. Cornaglia, M. Strumendo
CHEMICAL ENGINEERING JOURNAL
(2018)
Article
Chemistry, Physical
Diana Peltzer, John Munera, Laura Cornaglia
Summary: Li2ZrO3, K-doped Li2ZrO3, and mixed Li2ZrO3-Na2ZrO3 based sorbents were synthesized via wet impregnation method and their structural, performance, and reactivity were characterized. The addition of water was found to improve the capture properties, while also impacting the regeneration efficiency, with KLiZr showing better stability than NaLiZr. The study suggests that water enhances the reactivity of alkali zirconates by increasing ionic mobility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Environmental
Diana Peltzer, Luis A. Salazar Hoyos, Betina Faroldi, John Munera, Laura Cornaglia
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2020)
Article
Engineering, Environmental
Diana Peltzer, John Munera, Laura Cornaglia
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2019)