Article
Chemistry, Physical
Jose L. Bott-Neto, Thiago S. Martins, Osvaldo N. Oliveira, Frank Marken
Summary: This study presents a PEC platform based on TiO2 electrodeposition onto printed carbon electrodes, which eliminates the need for heat treatment. The resulting electrodes show higher photocurrents and improved sensitivity and selectivity for detecting ascorbic acid. The use of brookite TiO2 nanocrystals allows for the production of miniaturized devices for sensitive, selective PEC (bio)sensors.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Xiaochi Han, Wenbo Dong, Longyu Li, Xuemei Zhou
Summary: In this work, a three-dimensional heterojunction is formed by coupling one-dimensional TiO2 nanotube arrays with a controlled thickness covalent organic framework (COF) thin film. The resulting heterojunction exhibits a 3.3-fold higher hydrogen evolution rate compared to TiO2 and becomes active for CO2 conversion, as compared to the bare COF. Such high activity is attributed to the large difference in Fermi levels forming an internal electric field at the interface.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Xuewen Wu, Shaolun Cui, Minfei Fei, Sheng Liu, Xueping Gao, Guoran Li
Summary: In this work, an inverse-opal structured TiO2 membrane is designed to regulate the electrodeposition behavior of lithium metal, providing a fundamental solution to the poor cycle stability and lithium dendrite safety problems. Through homogenizing the mass transfer process, reducing the desolvation barrier, and confining the migration of lithium atoms, the electrodeposition process of lithium metal is essentially changed, eliminating the possibility of lithium dendrite formation.
GREEN ENERGY & ENVIRONMENT
(2023)
Article
Electrochemistry
Xin Zhou, Nikita Denisov, Gihoon Cha, Imgon Hwang, Patrik Schmuki
Summary: This study compares the photoresponse of vertically erected single crystal anatase layers with that of TiO2 nanotube layers, showing that the de-fluorinated VE-anatase layers exhibit significantly higher photocurrents due to faster electron transport in these single crystal electrodes.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Electrochemistry
Nathanael Downes, Quintin Cheek, Stephen Maldonado
Summary: The electrochemical reactivity and suitability of hexachlorodisilane and tetrakis(trichlorosilyl)silane as Si ec-LLS electrodeposition precursors were investigated. Perchlorinated silanes exhibit similar electrochemical responses as SiCl4, but with low faradaic efficiency, and the anion in the supporting electrolyte affects the stability of the precursor solution.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Physics, Applied
Jingyi Ma, Xiaona Wang, Xiaohang Zong, Linli Li, Hao Sun, Pan He, Yuan Yang, Yong Ding, Yu Han, Xiaoxing Fan
Summary: A TiO2/g-C3N4 composite photoanode was prepared by co-electrodeposition to improve the photoelectrochemical performance. The composite photoelectrodes showed enhanced PEC performance compared to TiO2 and g-C3N4. The optimized photocurrent density reached 1.81 mA cm(-2) with a TiO2 to g-C3N4 mass ratio of 1:1, demonstrating improved interfacial charge transfer and reduced electron-hole pair recombination.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Energy & Fuels
Samira Abdullayeva, Shikhamir Eminov, Khuraman Jalilova, Nahida Musayeva, Jafar Guliyev, Akif Aliyev, Vusala Majidzade, Gultekin Mammadova
Summary: Highly ordered transparent thin films of TiO2 with nanotube (TNT) arrays were successfully synthesized by electrochemical anodization. Analysis of the samples showed the presence of highly ordered TNT arrays with a high degree of optical transmission. The anodization time had an impact on the surface morphology and regularity of the pores. X-ray diffraction and Raman spectroscopy confirmed the presence of the anatase phase in the samples.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Ana Luiza Fornazari, Judith Castillo-Rodriguez, Daniel Correa-Encalada, Enrique A. Dalchiele, Samuel A. Hevia, Rodrigo del Rio
Summary: Green hydrogen is an important niche of interest, where the search for a suitable composite material is essential. Titanium oxide nanotubes (TNTs) were prepared and used as templates for the deposition of hematite using three different synthetic procedures. Electrochemical synthesis showed the best control of deposition and modification of the interface electrode-electrolyte, making it the preferred method for obtaining the desired material.
Article
Electrochemistry
Daniel Ramirez, Gonzalo Riveros, Patricia Diaz, Martin Faundez, Javier Verdugo, Marcelo Verdugo, Francisco Martin, Maria Cruz Lopez-Escalante, Daniel L. Gau, Enrique A. Dalchiele, Ricardo E. Marotti
Summary: High-quality n-type semiconducting SnO2 thin films were successfully prepared on ITO and FTO coated glass substrates using a hybrid potentiodynamic/potentiostatic approach. The films exhibited good coverage and crystallinity without any defects. The presence of Sn4+ in the optimized films was confirmed by XPS. The films showed a direct bandgap energy of 3.60 eV and a possible indirect bandgap energy of 3.30 eV. The protocol presented in this study opens up new possibilities for the preparation of compact and transparent SnO2 films for applications in solar cells.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Li Sun, Jiayue Xie, Guanglu Lei, Xianghong Liu, Jianmin Ma, Jun Zhang
Summary: TiO2@Void@SnO2 double-shell hollow nanotubes were synthesized to enhance the electrochemical properties of Sn-based anode materials, showing stable capacity and long cycling stability. The unique structure effectively accommodates volume change and prevents SnO2 pulverization.
Article
Chemistry, Physical
Nikolina Makivic, Jae-Young Cho, Kenneth D. Harris, Jean-Marie Tarascon, Benoit Limoges, Veronique Balland
Summary: In this study, the electrochemical charge storage properties of nanostructured TiO2 electrodes composed of either anatase or amorphous TiO2 in a mild buffered aqueous electrolyte were systematically analyzed. It was found that both materials allow reversible bulk proton insertion, with TiO2 crystallinity affecting the energetics of the process. The study also revealed two competitive reactions, hydrogen evolution and a nonfaradaic self-discharge reaction, that decrease the Coulombic efficiency at low rates.
CHEMISTRY OF MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Abirdu W. Nemaga, Jean Michel, Mathieu Morcrette, Jeremy Mallet
Summary: By utilizing a Li-active, self-organized TiO2 nanotube template, a germanium (Ge)-based nanostructured anode has been successfully fabricated and demonstrated to have excellent performance in Li-ion batteries. The implemented electrochemical synthesis methods are cost-effective, easily accessible, and scalable compared to traditional costly and complex nanostructure synthesis processes. Moreover, the TiO2 nanotube arrays play important roles in providing mechanical support, enhancing active mass loading, and facilitating electron transport.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Abirdu W. Nemaga, Jean Michel, Mathieu Morcrette, Jeremy Mallet
Summary: The use of a Li-active, self-organized TiO2 nanotube template for the fabrication of Ge-based nanostructured anodes is demonstrated in this study. The electrochemical synthesis methods employed are cost-effective, accessible, and scalable. The study emphasizes the important roles of TiO2 nanotube arrays in improving the performance of the anodes.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Khaled M. Amin, Falk Muench, Ulrike Kunz, Wolfgang Ensinger
Summary: A novel catalyst design based on integrated nickel nanotube networks loaded with NiCo-LDH nanosheets is presented in this study, showing excellent performance in glucose sensing. The catalysts exhibit high sensitivity, low detection limit, fast response time, high selectivity and stability, covering two linear ranges up to 2.5 mM analyte.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Meiying Jia, Qi Liu, Weiping Xiong, Zhaohui Yang, Chang Zhang, Dongbo Wang, Yinping Xiang, Haihao Peng, Jing Tong, Jiao Cao, Haiyin Xu
Summary: This study successfully prepared Ar-Fe2O3/Ti3+-TiO2-NTs photoelectrodes through multiple processes and achieved efficient degradation of antibiotics. The photoelectrodes exhibited excellent performance in various applications.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Energy & Fuels
Shanshan Qin, Nikita Denisov, Johannes Will, Jan Kolarik, Erdmann Spiecker, Patrik Schmuki
Summary: Removing non-active Pt SAs on TiO2 by cyanide leaching dramatically increases the co-catalytic activity of remaining Pt SAs, achieving a remarkable turnover frequency of 4.87 x 10(5) h(-1) for H-2 evolution.
Article
Energy & Fuels
Amer Inayat, Alexandra Inayat, Wilhelm Schwieger, Barbora Sokolova, Pavel Lestinsky
Summary: This study investigates the thermo-catalytic pyrolysis of LDPE using HZSM-5 catalysts with different acid site densities. The results show that the catalyst with the highest acid site density produces the highest concentration of aromatics, while the catalyst with the lowest acid site density produces the highest concentration of C-2-C-4 olefins. These findings are important for the chemical recycling of plastic wastes.
Article
Energy & Fuels
Kamakshaiah Charyulu Devarayapalli, S. V. Prabhakar Vattikuti, Jaewon Lee, Taewan Kim, Kiyoung Lee
Summary: In this study, a nanostructure composed of zeolitic imidazolate framework and vanadium-doped nickel hydroxide was proposed as a highly efficient and stable electrocatalyst for water splitting. The resulting nanostructure exhibited enhanced electrocatalytic activity, surface area, and pore volume, and demonstrated excellent performance in alkaline water electrolysis.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Kamakshaiah Charyulu Devayulalli, Jaewon Lee, Sinwoo Kang, Sanghyeon Moon, S. V. . Prabhakar Vattikuti, Jaeyoung Lee, Kiyoung Lee
Summary: Precious metal-free electrocatalysts are crucial for the production of green hydrogen using low-cost electrolysis technology. This study proposes a low-cost electrocatalyst composed of cadmium sulfide nanoparticles decorated in a Cobalt-based metal-organic framework, showing excellent electrochemical reactivity and stability, making it a promising electrolyzer for commercial power market.
JOURNAL OF POWER SOURCES
(2022)
Article
Materials Science, Multidisciplinary
Sanghyeon Moon, Devarayapalli Kamakshaiah Charyulu, Jaewon Lee, Taewan Kim, Jiwon Kim, Wonjoo Lee, Kiyoung Lee
Summary: In this study, the electrochemical detection of 2,4,6-trinitrotoluene (2,4,6-TNT) using a rutile TiO2 layer was successfully achieved. The rutile TiO2 layer was fabricated through chemical bath deposition and enhanced by calcination. The results demonstrated that the calcined TiO2 layer exhibited improved crystallinity and active site density, leading to enhanced performance in 2,4,6-TNT detection.
Article
Chemistry, Applied
Gyuwon Seo, Jaeyun Ha, Moonsu Kim, Jihyeon Park, Jaewon Lee, Eunoak Park, Sungyool Bong, Kiyoung Lee, Soon Jong Kwon, Seung-pil Moon, Jinsub Choi, Jaeyoung Lee
Summary: In this study, incremental capacity-differential voltage (IC-DV) is used as a non-invasive diagnostic tool to observe capacity fading in lithium-ion batteries. The results indicate that the initial steep degradation slopes gradually transition to gentle states during cycling at high current rates, revealing the difference between low and high current measurements. The IC-DV curves are used to parameterize the loss of active materials and loss of lithium inventory.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Amara Nasir, Anca Mazare, Xin Zhou, Shanshan Qin, Nikita Denisov, Lukas Zdrazil, Stepan Kment, Radek Zboril, Tariq Yasin, Patrik Schmuki
Summary: This study presents a low-cost, one-step photocatalytic method for synthesizing graphene oxide (GO) using commercial graphite and grey TiO2. GO formation is achieved through UV illumination of a slurry containing well-dispersed grey TiO2 and commercial graphite. The resulting GO-decorated TiO2 acts as a visible-light-active photocatalyst for applications such as pollutant degradation.
Article
Chemistry, Multidisciplinary
Lakshmana Reddy Nagappagari, Santosh S. Patil, Jaewon Lee, Eunoak Park, Yeon-Tae Yu, Kiyoung Lee
Summary: The study demonstrates the effectiveness of two strategies, non-metal doping and heterojunction formation, in adjusting the electronic and molecular structures of g-C3N4 nanosheets. The optimized materials showed improved visible-light response and enhanced electron-hole separation, leading to excellent degradation efficiency.
MATERIALS TODAY CHEMISTRY
(2022)
Editorial Material
Chemistry, Applied
Jaeyoung Lee, Kiyoung Lee
Review
Chemistry, Physical
JeongEun Yoo, Kiyoung Lee
Summary: The self-organized TiO2 nanotubes can be formed by electrochemical anodization, but traditional electrolytes limit their electrical properties and applications. This review introduces a new anodization approach using carbon-free electrolyte in ortho-phosphoric acid, which allows the formation of highly ordered TiO2 nanotube arrays. Further modifications, such as heat-treatment, noble metal deposition, thermal dewetting, and double anodization, are discussed to enhance the optical and electrical properties for various applications.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2023)
Article
Electrochemistry
Sanghyeon Moon, JeongEun Yoo, Wonjoo Lee, Kiyoung Lee
Summary: Zinc oxide nanoparticle electrode catalysts were used to electrochemically detect benzene-derived compounds by controlling the geometric factors. The detection sensitivity difference was measured by adjusting the particle size and oxide-layer thickness. Spin-coating was performed to control the nanoparticle layer thickness. The results showed that zinc oxide nanoparticles with a diameter of 50 nm and a thickness of around 2 μm exhibited the best detection performance. Two additional benzene-derived compounds were also successfully detected. The study highlights the importance of adjusting geometric factors in enhancing the detection sensitivity.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
L. R. Nagappagari, Mohammad Jamir Ahemad, G. -j. Oh, Kiyoung Lee, Yeon-Tae Yu
Summary: The study focuses on improving the efficiency of photocatalytic charge transfer by introducing boron (B) dopant, Ag quantum dots (QDs), and g-C3N4/SnO2 heterojunction nano-composite. These modifications enhance the migration of photoexcited electrons and reduce electron-hole recombination, resulting in improved catalytic activity and performance.
MATERIALS TODAY NANO
(2023)
Article
Multidisciplinary Sciences
Sanghyeon Moon, JeongEun Yoo, Wonjoo Lee, Kiyoung Lee
Summary: In this study, self-organized ZnO nanorod arrays were synthesized on FTO glasses and ZnO nanoparticles using chemical bath deposition (CBD) method to enhance the detection properties of ZnO nanostructural electrodes. The ZnO electrodes on the two different substrates were characterized and their detection performance was electrochemically measured in a 2,4,6-trinitrotoluene (2,4,6-TNT) solution. The width of the ZnO nanorods played a role in determining the differences in current densities between the ZnO electrodes, with F-CBD electrodes showing a approximately 45% higher detection efficiency compared to S-CBD electrodes.
Article
Chemistry, Inorganic & Nuclear
Eunoak Park, Taehyeon Kim, JeongEun Yoo, Kiyoung Lee
Summary: Nanostructuring of metal oxides is an effective approach to enhance photoelectrochemical (PEC) performance. This study investigates the anodization of W metal to fabricate optimal WO3 nanostructures for photoanodes. The anodization process involves fluoride-containing electrolyte and results in the formation of WO3 nanocoral structures. The PEC performance is further improved by coating BiVO4 layers on the WO3 nanostructures, leading to increased photocurrent density and IPCE due to band alignment.
INORGANICA CHIMICA ACTA
(2023)
Review
Electrochemistry
Jiyoung Kim, Kiyoung Lee
Summary: The anion exchange membrane (AEM) water electrolysis is a green hydrogen production technology that uses inexpensive catalysts instead of precious metal catalysts. However, further research is needed on AEM, ionomers, electrode supports, and catalysts. Current studies focus on improving the activity and durability of the AEM system by using alkaline catalysts.
JOURNAL OF THE KOREAN ELECTROCHEMICAL SOCIETY
(2022)
