Article
Chemistry, Physical
Dariusz Lewandowski, Tomasz Cytlak, Rhett Kempe, Grzegorz Hreczycho
Summary: This study describes the functionalization of silylacetylenes with hydroboranes catalyzed by cobalt (pre)-catalysts. The direction of the reaction is determined by the substituent at the aromatic ring in triazine PN5P pincer ligands. The catalytic approach successfully produces hydroboration and dehydrogenative coupling products. The use of commercially available pinacolborane as a simultaneous substrate and (pre)catalyst's activator makes this protocol versatile. Furthermore, the procedure yields a group of compounds with potential industrial and synthetic applications.
JOURNAL OF CATALYSIS
(2022)
Review
Chemistry, Inorganic & Nuclear
Victoria A. Vaillard, Pablo D. Nieres, Santiago E. Vaillard, Fabio Doctorovich, Biprajit Sarkar, Nicolas Neuman
Summary: Metallocorroles have emerged as interesting and versatile catalysts for various redox reactions, with their diversity and richness offering endless possibilities for research.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Engineering, Environmental
Ying Zheng, Wei Zhuang, Mengshang Zhao, Jian Zhang, Yunqian Song, Shuan Liu, Huaili Zheng, Chun Zhao
Summary: This study compared the piezoelectric ozonation processes driven by hydraulic and ultrasonic forces, revealing that ultrasound-driven process achieved higher efficiency and generated more active species. Despite that, it consumed less energy, mainly due to the significantly higher piezoelectric potential and current density generated by ultrasound, leading to different paths of active species generation.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Di Wang, Ying Chang
Summary: Finding an efficient, sensitive, and stable catalyst is crucial for accurate glucose detection in non-enzyme glucose sensors. In this study, a catalyst of selenide cobalt (CoSe2) on carbon nanomaterials was constructed through auxiliary pyrolysis of sodium chloride. The CoSe2 on carbon nanosheets showed good selectivity and a wide linear detection range.
Article
Chemistry, Physical
Neha Antil, Manav Chauhan, Naved Akhtar, Rajashree Newar, Wahida Begum, Jaideep Malik, Kuntal Manna
Summary: In this study, a novel Ce-UiO-Co heterogeneous catalyst is reported, which can efficiently convert methane to methanol under mild conditions with high selectivity and yield. The catalyst design is based on a metal-organic framework and involves the formation of an intermediate species in the pores of Ce-UiO-66, enabling the activation and functionalization of methane.
Article
Chemistry, Physical
Spencer P. Heins, Patrick E. Schneider, Amy L. Speelman, Sharon Hammes-Schiffer, Aaron M. Appel
Summary: The research shows that the cobalt complex (CoP3)-P-II can catalytically oxidize benzyl alcohol to benzaldehyde under specific conditions, and can also undergo reduction in a noncatalytic reaction. Electron transfer occurs between intermediate cobalt species and the starting (CoP3)-P-II during the reaction process.
Article
Chemistry, Physical
Neha Antil, Manav Chauhan, Naved Akhtar, Rajashree Newar, Wahida Begum, Jaideep Malik, Kuntal Manna
Summary: This article reports the development of a highly efficient catalyst for the selective oxidation of methane to methanol under mild conditions. The catalyst, a cobalt hydroxide supported by a cerium metal-organic framework, achieves a high methanol yield and selectivity using hydrogen peroxide as the oxidant. Experimental and computational studies provide insights into the active sites and catalytic mechanism of the catalyst.
Review
Chemistry, Physical
Amarajothi Dhakshinamoorthy, Eva Montero Lanzuela, Sergio Navalon, Hermenegildo Garcia
Summary: Metal organic frameworks (MOFs) are porous crystalline solids with metal ions and rigid organic linkers, leading to materials with high surface area and pore volume. This article reviews Co-based MOFs for oxidation reactions, comparing their advantages with homogeneous salts in terms of product selectivity and stability. Future developments in this field are discussed in the final section.
Article
Chemistry, Physical
Soyeb Pathan, Anjali Patel, Harshita Tilani
Summary: A highly dispersed cobalt catalyst supported on 12-tungstosilicic acid modified zirconia was successfully synthesized as a clean and selective oxidation catalyst. It demonstrated excellent selectivity and turnover number in oxidizing benzyl alcohol and styrene to carbonyl compounds under solvent-free conditions.
Article
Mechanics
Longkun Lu, Zhanli Liu, Yinan Cui, Zhuo Zhuang
Summary: This paper investigates the driving force on the line, zero height, fracture process zone (FPZ). It derived basic laws for crack propagation based on the configurational force approach in the framework of traditional continuum mechanics. The driving force on steady line FPZ is a direct consequence of these derivations. Additionally, the paper also discusses the driving force on non-steady line FPZ in relation to the crack propagation process.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Engineering, Environmental
Banghai Liu, Wanqian Guo, Qishi Si, Wenrui Jia, Shanshan Zheng, Huazhe Wang, Qi Zhao, Haichao Luo, Jin Jiang, Nanqi Ren
Summary: In this study, atomically dispersed cobalt anchored carbon nitride is presented as a highly efficient catalyst for peroxymonosulfate activation. High-valent cobaltoxo species generated through a unique two-electron transfer pathway are confirmed as the primary oxidants, with hydroxyl radicals serving as secondary intermediates. Interestingly, under light irradiation, the catalysis switches to a radical-dominated pathway, suggesting that the cobalt catalyst can also act as a photoswitch to regulate the oxidation pathways.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Applied
Mianran Chao, Hongyan Wang, Haixing Zhang, Fubi Zhong, Zhen Luo, Fengyun Wu, Feiyang Sun, Jiaojiao Jiang, Xuexue He, Shumiao Zhang, Peiwei Gong, Bin Wang, Duyi Shen
Summary: The Cobalt/peroxymonosulfate (Co/PMS) system is an efficient oxidation process for degrading organic pollutants in wastewater. This study demonstrates the use of this system for the preparation of biaryl lactones, offering several advantages. Mechanism studies indicate the presence of a high-valent cobalt-oxo intermediate and the involvement of persulfate radical anion and hydroxyl radical in the organic reaction.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Shangxing Li, Hikaru Iwami, Mio Kondo, Shigeyuki Masaoka
Summary: This report describes a function-integrated water oxidation catalyst produced by electrochemical polymerization. The catalyst exhibits excellent charge transport ability and superior electrocatalytic water oxidation performance compared to the nonpolymeric system.
Article
Engineering, Mechanical
Jun He, Mingjin Shen, Feng Gao, Haibo Zhang
Summary: This paper proposes a new force control method that can eliminate force divergence in position-controlled industrial robots operating in unknown environments. A hardware-in-the-loop simulator is used to establish the dynamics and motion mapping, and an adaptive Kalman filter is applied for real-time estimation of contact stiffness and damping. The method effectively compensates for measurement delay and dynamic response delay, preventing simulation divergence.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Wei Jiang, Huini Deng, Jie Liu
Summary: In this study, a hybrid photocatalyst was developed by grafting a cobalt molecular complex onto mesoporous carbon nitride, enabling efficient photocatalytic oxidation of organic molecules. This strategy offers a promising approach for oxidative reactions in photocatalytic chemical synthesis.
CATALYSIS COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Yonggui Zhao, Nanchen Dongfang, Carlos A. Triana, Chong Huang, Rolf Erni, Wenchao Wan, Jingguo Li, Dragos Stoian, Long Pan, Ping Zhang, Jinggang Lan, Marcella Iannuzzi, Greta R. Patzke
Summary: The rational design of efficient electrocatalysts for industrial water splitting is crucial for sustainable hydrogen fuel generation. In this study, hierarchically nanostructured Co@CoFe-P NBs were introduced as alternative electrocatalysts for industrial-scale applications. Operando analysis and theoretical calculations revealed the catalytic mechanisms of these electrocatalysts in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), providing important insights for future energy conversion and storage.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Physical
Jan Buehler, Jonas Zurflueh, Sebastian Siol, Olivier Blacque, Laurent Severy, S. David Tilley
Summary: Efficient catalytic oxidative C-H activation of organic substrates remains a challenge in synthetic chemistry. This study demonstrates that using a transition metal catalyst, surface immobilisation, and an electrochemical potential can effectively catalyze the oxidation reactions in aqueous solution. The immobilisation of the catalyst on a mesoporous indium tin oxide electrode surface resolves the issues observed in solution. The heterogeneous catalyst system shows high turnover numbers for the oxidation of organic substrates with varying bond dissociation energies.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Rajiv Ramanujam Prabhakar, Thomas Moehl, Dennis Friedrich, Marinus Kunst, Sudhanshu Shukla, Damilola Adeleye, Vinayaka H. Damle, Sebastian Siol, Wei Cui, Laxman Gouda, Jihye Suh, Yaakov R. Tischler, Roel van de Krol, S. David Tilley
Summary: This study investigates the charge carrier dynamics of Sb2Se3 and the influence of sulfur treatment on its optoelectronic properties. The results show that sulfur treatment can increase the carrier lifetime of Sb2Se3 by passivating deep defects.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yonggui Zhao, Wenchao Wan, Nanchen Dongfang, Carlos A. Triana, Lewis Douls, Chong Huang, Rolf Erni, Marcella Iannuzzi, Greta R. Patzke
Summary: In this study, a sulfur heteroatom tuning strategy was introduced to optimize the performance of active Ni and Fe centers in coordination polymer catalysts. The sulfur engineering of Ni/Fe-CPs was found to facilitate dioxygen formation by optimizing the local electronic structure of their active centers. The sulfur-doped Ni/Fe-CPs showed higher OER activity compared to sulfur-free NiFe-based electrocatalysts.
Article
Chemistry, Physical
Huagui Lai, Jincheng Luo, Yannick Zwirner, Selina Olthof, Alexander Wieczorek, Fangyuan Ye, Quentin Jeangros, Xinxing Yin, Fatima Akhundova, Tianshu Ma, Rui He, Radha K. Kothandaraman, Xinyu Chin, Evgeniia Gilshtein, Andre Muller, Changlei Wang, Jarla Thiesbrummel, Sebastian Siol, Jose Marquez Prieto, Thomas Unold, Martin Stolterfoht, Cong Chen, Ayodhya N. Tiwari, Dewei Zhao, Fan Fu
Summary: This study addresses the challenges in developing efficient flexible all-perovskite tandem solar cells and presents methods to enhance their efficiency. By using self-assembled monolayers and postdeposition treatment to suppress bulk and interfacial recombination, successful fabrication of flexible all-perovskite tandem solar cells is achieved, leading to high-efficiency performance in the flexible tandems.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yuen-Yee Lau, Kangwei Chen, Shanqiu Liu, Lukas Reith, Stefan Seeger
Summary: In this study, silicone nanofilament (SNF) coatings were prepared via a droplet-assisted growth and shaping (DAGS) approach, and their application as catalyst supports was investigated. The results showed that the SNF-coated filters had significantly increased surface areas and demonstrated superior catalytic performance and ease of functionalization.
Article
Nanoscience & Nanotechnology
J. Madhusudhan Naik, Brendan Bulfin, Carlos A. Triana, Dragos Constantin Stoian, Greta R. Patzke
Summary: Identifying thermodynamically favorable and stable non-stoichiometric metal oxides is crucial for solar thermochemical fuel production. Perovskite oxides, specifically cation-deficient Ce-substituted perovskite oxides, show promise as redox materials with high-temperature stability and improved thermodynamic properties.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Alexander Wieczorek, Huagui Lai, Johnpaul Pious, Fan Fu, Sebastian Siol
Summary: Reliable chemical state analysis of Sn semiconductors is challenging due to the small observed binding energy shift in the Sn 3d region. This study investigates the use of modified Auger parameter alpha ' to analyze different chemical states in Sn-based perovskites. The results show that alpha ' is highly sensitive to the composition of the halide site, providing a framework for tracking degradation and composition in Sn-based perovskites.
ADVANCED MATERIALS INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Yonggui Zhao, Devi Prasad Adiyeri Saseendran, Chong Huang, Carlos A. Triana, Walker R. Marks, Hang Chen, Han Zhao, Greta R. Patzke
Summary: The oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are critical steps in energy conversion and storage systems, but their slow kinetics and the complexity of catalyst-electrolyte interfaces limit their practical applications. Recent advances in in situ/operando characterization techniques have enabled the monitoring of catalysts under reaction conditions, providing valuable insights into the mechanistic studies of OER/ORR catalysts. This review highlights the determination of active species, identification of active sites, and monitoring of reactive intermediates, and discusses strategies for rational catalyst design.
Article
Chemistry, Multidisciplinary
Dmitry N. Dirin, Anna Vivani, Marios Zacharias, Taras V. Sekh, Ihor Cherniukh, Sergii Yakunin, Federica Bertolotti, Marcel Aebli, Richard D. Schaller, Alexander Wieczorek, Sebastian Siol, Claudia Cancellieri, Lars P. H. Jeurgens, Norberto Masciocchi, Antonietta Guagliardi, Laurent Pedesseau, Jacky Even, Maksym V. Kovalenko, Maryna I. Bodnarchuk
Summary: The search for nontoxic alternatives to lead halide perovskites (LHPs) has revealed that the properties of LHPs can only be achieved in their closest Sn(II) and Ge(II) analogues, despite their tendency to oxidize. A judicious choice of chemistry led to the development of formamidinium tin iodide (FASnI3) with a power conversion efficiency of 14.81% in photovoltaic devices. The synthesis of colloidal FASnI3 NCs with reduced Sn(IV) concentration allowed for the investigation of their intrinsic structural and optical properties, showing characteristics distinct from bulk FASnI3.
Article
Materials Science, Coatings & Films
Jyotish Patidar, Amit Sharma, Siarhei Zhuk, Giacomo Lorenzin, Claudia Cancellieri, Martin F. Sarott, Morgan Trassin, Kerstin Thorwarth, Johann Michler, Sebastian Siol
Summary: This study demonstrates the oblique-angle deposition of highly textured and c-axis oriented AlN (0002) thin films using reactive metal-ion synchronized HiPIMS. By combining moderate substrate biasing and synchronizing the negative substrate bias potential with the Al-rich fraction of each HiPIMS pulse, the crystalline quality and texture of the films are significantly improved, while the gas incorporation and point defect formation are reduced. The films exhibit pronounced out-of-plane texture and uniform grain polarization, making them suitable for piezoelectric applications.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Siarhei Zhuk, Alexander Wieczorek, Amit Sharma, Jyotish Patidar, Kerstin Thorwarth, Johann Michler, Sebastian Siol
Summary: The discovery of new functional materials is a key challenge in materials science. Combinatorial high-throughput approaches are commonly used for screening unexplored phase spaces, but the process conditions are often not optimized, leading to poor crystallinity of thin films. In this study, a combinatorial screening of the Zn-Ta-N phase space was conducted, resulting in the synthesis of the novel semiconductor Zn2TaN3. Furthermore, the functional properties of Zn x Ta1-x N were mapped, and previously unreported clean chemical state analysis for Zn3N2, TaN, and Zn2TaN3 was reported.
CHEMISTRY OF MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Quentin Guesnay, Charles J. McMonagle, Dmitri Chernyshov, Waqas Zia, Alexander Wieczorek, Sebastian Siol, Michael Saliba, Christophe Ballif, Christian M. Wolff
Summary: High-vacuum, single-source thermal evaporation is an appealing deposition process for perovskite photovoltaics due to its promise of homogeneous and controlled growth of pure and uniform films. Mechanical synthesis of substoichiometric cesium bromide-lead iodide precursors and subsequent deposition and conversion processes were studied. The results show that no new phases were formed during ball-milling, and halide exchange between precursors occurs during the evaporation process. Furthermore, films with higher cesium bromide content exhibit more impurities, while optimized cesium bromide content leads to photovoltaic devices with 15% efficiency at an optical bandgap of 1.7 eV.
Article
Chemistry, Multidisciplinary
Devi Prasad Adiyeri Saseendran, Jorg W. A. Fischer, Lea Muller, Daniel F. Abbott, Victor Mougel, Gunnar Jeschke, Carlos A. Triana, Greta R. Patzke
Summary: This report presents the synthesis and spectroscopic evidence of a new defect-cubane type copper complex that acts as a pre-catalyst for water oxidation. In situ and post-catalytic studies reveal that the tetrameric complex undergoes structural transformations into dimeric and monomeric species induced by water molecules and carbonate anions, respectively. Moreover, the observed electrocatalytic water oxidation activity is confirmed to arise from in situ-generated Cu(ii) oxidic nanostructures at the electrode interface.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Moritz H. Futscher, Thomas Amelal, Jordi Sastre, Andre Muller, Jyotish Patidar, Abdessalem Aribia, Kerstin Thorwarth, Sebastian Siol, Yaroslav E. Romanyuk
Summary: The use of amorphous carbon as an intermediate layer between the Cu current collector and the Lipon solid electrolyte improves the nucleation and growth of Li metal, leading to enhanced performance of anode-free solid-state batteries.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
