Article
Engineering, Environmental
Peijing Guo, Zhangyi Xiong, Shaoyu Yuan, Kaihong Xie, Haijun Wang, Yongjun Gao
Summary: In this study, a low-cost and environmentally friendly photocatalyst was developed using a simple calcination process with natural materials, achieving high hydrogen evolution rate. The hybrid structure of cobalt ingredients is essential for excellent photocatalytic performance, reducing the free energy for hydrogen adsorption and facilitating H2 production.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Alireza Asghari, Sajjad Keshipour
Summary: In this study, Co(II) citrate complex nanoparticles (CoC NPs) were synthesized and immobilized on GO sheets to form a binary nanocomposite, CoC/GO. The self-condensation reaction of citric acid facilitated the in situ construction of GO support and grafting of complex NPs onto its surface. The resulting CoC/GO nanocomposites demonstrated high catalytic activity in visible light-induced water splitting.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Inorganic & Nuclear
Jiadong Zhang, Lijing Zhang, Chen Mao, Ruilong Gu, Wei Wang, Yuxin Wang, Ziyan Zhou, Bin Yan, Lingling Bi, Qiuyan Fu, Yiyao Zhu
Summary: Photocatalytic water splitting is an ideal way to solve the energy crisis and environmental pollution, by transforming low-density solar energy into high-density, new and clean energy in a clean way. In this paper, the CoxP/hollow porous C3N4 composite photocatalytic material was synthesized using simple methods. The photocatalytic hydrogen production rate of CoxP/hollow porous C3N4 reached 1602 μmol g(-1) h(-1), which is 151 times higher than that of pure C3N4. The reasons for its high activity can be summarized as follows: the hollow and porous structure of C3N4, the Schottky contact between CoxP and C3N4, and the higher conductivity of CoxP.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Engineering, Environmental
Rossella Greco, Lucia Baxauli-Marin, Filipp Temerov, Matyas Daboczi, Salvador Eslava, Yuran Niu, Alexei Zakharov, Meng Zhang, Taohai Li, Wei Cao
Summary: In this study, a multifunctional photocatalyst was formed by decorating 0D Co3O4 onto 2D Co(OH)2. The synthesized Co3O4@Co(OH)2 composite showed an efficiency of 40% in degrading polystyrene microplastics under 0.495 W white LED illumination, and achieved a H2 evolution reaction of 43 μmol g-1 without sacrificial agents. The energy band diagrams and analysis of radicals involved in the photocatalytic degradation revealed the mechanisms of both processes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Harshavardhan Mohan, Ga Hyeon Ha, Gitae Kim, Hye Rin Lee, Hakju Lee, Kyoungsoo Kim, Taeho Shin
Summary: The renewability and zero carbon emissions of hydrogen make it a promising clean energy resource. Photocatalytic water-splitting, despite its low efficiency, has been extensively researched for hydrogen production. In this study, bimetallic transition metal selenides were synthesized and evaluated for their photocatalytic water splitting efficiencies. Among the compounds tested, CMSc exhibited the highest hydrogen evolution rate and also showed great potential in degrading pollutants. Thus, CMSc can be identified as a highly efficient photocatalyst for both environmental and energy applications.
Article
Biochemistry & Molecular Biology
Xing Liu, Hua Lai, Junhua Li, Gang Peng, Rongying Zeng
Summary: Cobalt phosphate materials were prepared using different raw materials at room temperature, showing 3D flower-like structures with varying compactness depending on the raw materials used. The cobalt phosphates exhibited high photocatalytic activity for HER, with CoP(A) showing higher activity than CoP(B) due to its more dispersive nanosheet and larger BET-specific surface area. This work contributes towards the development of cost-efficient solar HER using abundant elements for sustainable development.
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Tim Pfister, Tilo Sohnel, Terrence J. Collins, L. James Wright
Summary: It was found that the macrocyclic complex [FeIIICl(L)] with two pyridinium groups showed high oxidation catalytic activity at pH 7, and it exhibited high stability towards acid-promoted demetallation at pH 5 or above.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Lars Kohler, Andrea M. Potocny, Jens Niklas, Matthias Zeller, Oleg G. Poluektov, Karen L. Mulfort
Summary: Four new molecular Co(II) tetrapyridyl complexes were synthesized and evaluated for their activity as catalysts for proton reduction in aqueous environments. The substitution of pyrazine groups around the macrocycle had a substantial impact on the observed metal- and ligand-centered reduction potentials as well as the overall H-2 catalytic activity. The study highlights how even small differences in molecular catalysts can have significant effects on activity and provides insights into optimizing the photocatalytic activity and stability of molecular systems.
Article
Nanoscience & Nanotechnology
Vitalii Kavun, Evgeny Uslamin, Bart van der Linden, Stefano Canossa, Andrey Goryachev, Emma E. Bos, Jara Garcia Santaclara, Grigory Smolentsev, Eveliina Repo, Monique A. van der Veen
Summary: In this study, a simple postmodification method was used to confine Co-II cocatalysts within NH2-MIL-125(Ti), resulting in a highly stable and visible-light-responsive photocatalyst. The catalyst exhibited enhanced hydrogen production activity under visible light exposure, and maintained its structural integrity and consistent hydrogen production after consecutive reuse.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biochemistry & Molecular Biology
Emily H. Edwards, Jana Jelusic, Saikat Chakraborty, Kara L. Bren
Summary: A study has demonstrated that utilizing acetylated cobalt microperoxidase-11 as a catalyst, [Ru(bpy)(3)](2+) as a photosensitizer, and ascorbic acid as an electron donor can efficiently produce hydrogen from water in a visible light-driven reaction, with the highest efficiency achieved at neutral pH. The catalyst designed in this way shows longevity and outperforms traditional electrochemical systems.
JOURNAL OF INORGANIC BIOCHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Yue Cui, Li Zhang, Jing Liu, Taozhe Zhang, Aya Sugahara, Atsuya Momotake, Yasuhiko Yamamoto, Zong-wan Mao, Hulin Tai
Summary: In this study, an artificial DNAzyme composed of cobalt-protoporphyrin IX (CoPP) and G-quadruplex DNA was constructed to catalyze photo-induced H2 production. The G-quadruplex DNA significantly enhanced the photocatalytic H2 production for CoPP, and the DNAzyme exhibited an optimal acid-base equilibrium with a pKa value of 7.60 +/- 0.05, which is attributed to the balance between Co(III)-H- and Co(I) states. These findings demonstrate the potential of using DNAzymes for direct conversion of solar energy to H2 from water.
Article
Chemistry, Physical
Nai-Yuan Jheng, Yusuke Ishizaka, Yuki Naganawa, Yasunori Minami, Akira Sekiguchi, Kosuke Iizuka, Yumiko Nakajima
Summary: This study demonstrates the radical hydrodehalogenation of aryl halides using a Co(I) catalyst under atmospheric pressure, with a mechanistic study revealing the involvement of PNNP-Co complex and long-range metal-ligand cooperation. The reaction is applicable to various aryl bromides and aryl chlorides.
Article
Chemistry, Physical
Wei Wang, Tao Li, Sridhar Komarneni, Xin Lu, Baojiang Liu
Summary: This review focuses on the recent progress of highly efficient Co-based co-catalysts for water splitting, emphasizing the structure-activity relationships and discussing the co-catalytic reactivities of various Co-based materials when coupled with host semiconductors.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Xi Yang, Zhen Tian, Yufang Chen, Hao Huang, Jie Hu, Bin Wen
Summary: A series of cobalt-doped g-C3N4 nanosheet photocatalysts with different cobalt doping content were prepared, among which the 1 wt% sample showed excellent photocatalytic activity and stability, with higher H2 evolution and MB degradation performance compared to bulk g-C3N4.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Daniel Costabel, Afshin Nabiyan, Avinash Chettri, Franz Jacobi, Magdalena Heiland, Julien Guthmuller, Stephan Kupfer, Maria Waechtler, Benjamin Dietzek-Ivansic, Carsten Streb, Felix H. Schacher, Kalina Peneva
Summary: We present a photocatalytic setup using the organic photosensitizer diiodo-BODIPY, the non-precious-metal-based hydrogen evolution reaction catalyst (NH4)2[Mo3S13], and a polyampholytic unimolecular matrix poly(dehydroalanine)-graft-poly(ethylene glycol) in water. The system exhibits remarkable performance with high turnover numbers (TON > 7300) and turnover frequencies (TOF > 450 h-1), comparable to noble-metal-containing systems. Excited-state absorption spectra confirm the formation of a long-lived triplet state of the photosensitizer in both water and organic media. This system serves as a blueprint for developing noble-metal-free hydrogen evolution reaction in water, allowing for component optimization by modifying the substituent of the photosensitizer and the composition of the catalyst.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
Sushila, Swati Dhamija, Moumita Patra, Jacques Pecaut, Ramesh Kataria, Soumyabrata Goswami, Susovan Bhowmik, Ranjan Patra
Summary: The coordination chemistry of a tetradentate N2O2-type ligand with cobalt(II) and iron(III) ions was investigated. Dinuclear cobalt(II) and trinuclear iron(III) complexes were synthesized, and their structures and magnetic properties were studied. The results showed that the complexes exhibited different magnetic interactions mediated by different bridging groups.
INORGANICA CHIMICA ACTA
(2022)
Article
Chemistry, Physical
Cyrille Costentin, Fakourou Camara, Jerome Fortage, Marie-Noelle Collomb
Summary: This paper proposes a general analytical kinetic framework for the analysis of photoinduced catalytic processes. By incorporating limiting processes and providing analytical expressions, the experimental data is successfully explained.
Article
Chemistry, Multidisciplinary
Valeria Dantignana, M. Carmen Perez-Segura, Pau Besalu-Sala, Estefania Delgado-Pinar, Alvaro Martinez-Camarena, Joan Serrano-Plana, Andrea Alvarez-Nunez, Carmen E. E. Castillo, Enrique Garcia-Espana, Josep M. M. Luis, Manuel G. G. Basallote, Miquel Costas, Anna Company
Summary: Two oxoiron(IV) isomers, (R)2a and (R)2b, were synthesized by reacting an iron(II) precursor with NBu4IO4. These isomers differ in the position of the oxo ligand, cis and trans to the pyridine donor. The mechanism of isomerization between (R)2a and (R)2b was determined, revealing a unique path for interconversion of geometrical oxoiron(IV) isomers. The reactivity of the isomers in hydrogen atom transfer reactions was found to be dependent on their intrinsic structural aspects rather than the electronic properties of the ligand.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Biochemistry & Molecular Biology
Fakourou Camara, Thomas Gavaggio, Baptiste Dautreppe, Jerome Chauvin, Jacques Pecaut, Dmitry Aldakov, Marie-Noelle Collomb, Jerome Fortage
Summary: In this study, a new mono-terpyridyl rhodium complex was isolated and shown to act as a catalyst for the light-induced proton reduction into H-2 in the presence of a photosensitizer and sacrificial electron donor. The catalyst showed efficient photocatalytic production of molecular hydrogen.
Article
Instruments & Instrumentation
Gordana Lastovicka-Medin, Mateusz Rebarz, Gregor Kramberger, Tomas Lastovicka, Jakob Andreasson, Martin Precek, Mauricio Rodriguez-Ramos, Milos Manojlovic
Summary: The effects of highly energetic particles on LGADs need to be considered, as large deposits of energy can cause destructive breakdown. Studies using transient currents technique and ion beam induced charge technique have revealed important findings.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Biochemistry & Molecular Biology
Yingliang Liu, Aditya S. Chaudhari, Aditi Chatterjee, Prokopis C. Andrikopoulos, Alessandra Picchiotti, Mateusz Rebarz, Miroslav Kloz, Victor A. Lorenz-Fonfria, Bohdan Schneider, Gustavo Fuertes
Summary: A broadband dual transient visible absorption (visTA)/femtosecond stimulated Raman spectroscopy (FSRS) set-up was developed to monitor the complete excited-state dynamics of flavin mononucleotide (FMN) in solution and embedded in bacterial light-oxygen-voltage (LOV) photoreceptor EL222. The set-up covers a wide range of time delays and Raman shifts, providing valuable information on short-lived conformationally excited states. Additional dynamical events were found in the low-frequency Raman region below 1000 cm(-1).
Article
Physics, Multidisciplinary
Gordana Lastovicka-Medin, Mateusz Rebarz, Gregor Kramberger, Milos Manojlovic, Tomas Lastovicka, Jakob Andreasson
Summary: Advanced radiation therapy requires advanced instrumentation for dose delivery and beam monitoring. Research and development of state-of-the-art radiation detectors is necessary for the characterization of these detectors. The newly developed timing sensors with good spatial and timing resolution can be integrated into innovative technologies for microdosimetry. Two characterization techniques, ion beam induced charge (IBIC) and two-photon absorption-transient current technique (TPA-TCT), are presented in this paper for studying the region between two pixels.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Physics, Applied
Elias Baron, Ruediger Goldhahn, Shirly Espinoza, Martin Zahradnik, Mateusz Rebarz, Jakob Andreasson, Michael Deppe, Donat J. As, Martin Feneberg
Summary: We have published a recent study on femtosecond pump-probe absorption edge spectroscopy of cubic GaN, which resulted in the transient dielectric function. In this study, we investigate the time-dependent transition energy between the conduction and valence bands by analyzing pump-probe measurements. By converting transition energies into free-carrier concentrations and assuming electron contributions to be dominant, we model the ultra-fast change and consider various effects such as relaxation, recombination, diffusion, gain-recombination, and temperature effects. Both models provide similar values for the characteristic relaxation time, recombination time, and diffusion coefficient.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Elias Baron, Rudiger Goldhahn, Shirly Espinoza, Martin Zahradnik, Mateusz Rebarz, Jakob Andreasson, Michael Deppe, Donat J. J. As, Martin Feneberg
Summary: An ultra-fast change in the absorption onset of zincblende gallium-nitride (zb-GaN) is observed using time-dependent femtosecond pump-probe spectroscopic ellipsometry. The absorption onset increases due to band filling, while the bandgap decreases due to bandgap renormalization. The optical properties vary from the sample surface to the substrate, which is taken into account by grading analysis.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Analytical
Gordana Lastovicka-Medin, Mateusz Rebarz, Jovana Doknic, Ivona Bozovic, Gregor Kramberger, Tomas Lastovicka, Jakob Andreasson
Summary: We conducted an intensive investigation of the interpad (IP) gap region in the ultra-fast silicon detector (UFSD) Type 10 using a femtosecond laser beam and the transient current technique (TCT). By comparing TI-LGAD and standard UFSD structures, we aimed to clarify the IP region's isolation structure and measure the IP distance between pads, subsequently comparing it with the nominal value provided by the vendor. Our findings unexpectedly revealed a strong signal near p-stops, which exhibited significant avalanche multiplication with increasing laser power. This study provides valuable insights into the IP region's isolation structure and electric field effects on charge collection, offering critical data for the development of advanced sensor technology for the Compact Muon Selenoid (CMS) experiment and other high-precision applications.
Article
Biochemistry & Molecular Biology
Nicolas Fabre, Tuyoshi Fukaminato, Arnaud Brosseau, Michel Sliwa, Remi Metivier
Summary: A diarylethene-perylenebisimide (DAE-PBI) dyad with bright red emission and large ON-OFF contrast was studied, and its excited state dynamics were characterized in solution and nanoparticle suspension. Efficient energy transfer between the fluorophore and photochromic unit was demonstrated, occurring in a few hundreds of femtoseconds.
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
(2023)
Article
Chemistry, Inorganic & Nuclear
Carmen E. Castillo, Miguel A. Gonzalvez, Andres G. Algarra, M. Jesus Fernandez-Trujillo, Montserrat Ferrer, Manuel Martinez, Manuel G. Basallote
Summary: The reaction of [Fe-II(TSC)(2)] complexes with H2O2 resulted in the formation of diamagnetic low-spin Fe-II species capable of adding up to five oxygen atoms. These species showed activity in the oxidation of thioanisole to sulfoxide and styrene to benzaldehyde. Interestingly, other ligands and complexes also catalyzed the selective sulfoxidation of thioanisole but were ineffective in styrene oxidation. These findings suggest new directions for the development of thiosemicarbazone-based metal catalysts.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
A. Moinel, M. Brochnow, C. Aumaitre, E. Giannoudis, J. Fize, C. Saint-Pierre, J. Pecaut, P. Maldivi, V Artero, R. Demadrille, M. Chavarot-Kerlidou
Summary: This work presents the design and preparation of two new dyes and a molecular dyad for photoelectrochemical hydrogen production in a dye-sensitized photoelectrochemical cell (DSPEC). The introduction of a benzothiadiazole core improves the absorption properties and extends the visible spectrum up to 650 nm. The results demonstrate that increasing the light harvesting efficiency of the dyad by introducing an IDT-BTD chromophore is beneficial for the photoelectrochemical activity. Additionally, lithium doping of NiO significantly improves the performance.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Biochemistry & Molecular Biology
Girgis Obaid, Menitte Eroy, Jie Zhao, Shazia Bano, Mari Mino-Kenudson, Tayyaba Hasan
Summary: The presence of desmoplasia in pancreatic ductal adenocarcinoma (PDAC) is associated with poor treatment outcomes and reduced drug delivery. By analyzing collagen subtypes in PDAC tumors following different treatment regimens, immunofluorescence profiling can predict long-term survival and tumor growth inhibition. This information can aid in personalized treatment and improve patient survival.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
(2024)
Article
Biochemistry & Molecular Biology
Fatemeh Malekpour, Rashin Bahrami, Mahshid Hodjat, Neda Hakimiha, Behnam Bolhari, Aidin Sooratgar, Soheil Niavarzi
Summary: This study investigated the effect of photobiomodulation (PBM) therapy using an 808 nm diode laser on cellular modulation mechanisms in regenerative endodontic procedures (REPs). The results showed that PBM treatment significantly increased cell viability and migration, and enhanced the release of TGF-131 from dentin.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
(2024)
Article
Biochemistry & Molecular Biology
Pranathi Tata, Ramakrishnan Ganesan, Jayati Ray Dutta
Summary: Thin film coatings with potent antibacterial properties are widely used in medical devices, frequently touched surfaces, and food packaging. However, achieving antibacterial performance under both light and dark conditions remains a challenge. In this study, we successfully prepared AgBr-coated ZnO nanorod thin film architecture using a unique surfactant-mediated solution-phase spin-coating approach. The resulting structures showed dual functionality as antimicrobial agents and photosensitizers, effectively enhancing the visible-light photodisinfection efficacy of ZnO nanorods. The concentration of the surfactant-based precursor solution could be modulated to control the AgBr content. Additionally, components like urea and lactic acid were found to enhance the photocatalytic efficiency of the structures.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
(2024)