Article
Materials Science, Multidisciplinary
F. Roulland, G. Roseau, A. Pena Corredor, L. Wendling, G. Krieger, C. Lefevre, M. Trassin, G. Pourroy, N. Viart
Summary: Transition metal complex oxides exhibit rich tunable physical properties due to their strongly correlated electrons. Epitaxial thin films of magnetically frustrated FeV2O4 spinel vanadate compound were prepared through pulsed laser deposition. Optimizing oxygen pressure deposition conditions was crucial to avoid over-oxidation and oxygen vacancies. The compressive stress induced by MgO substrates led to unexpected lattice parameter reduction and increased magnetic transition temperature in the films. Strain tuning the magnetic order in these films opens up new possibilities for integration in oxide electronics.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Wenzhong Huang, Jiantao Li, Xiaobin Liao, Ruihu Lu, Chaohong Ling, Xiong Liu, Jiashen Meng, Longbing Qu, Mengting Lin, Xufeng Hong, Xunbiao Zhou, Shanlin Liu, Yan Zhao, Liang Zhou, Liqiang Mai
Summary: This study proposes a feasible ligand modulation strategy to boost the oxygen evolution reaction (OER) catalytic activity of cobalt-iron oxyhydroxide ((Fe,Co)OOH). By reducing the orbital overlap between the Fe/Co 3d and O 2p, the adsorption to oxygen-containing intermediates is weakened, which facilitates the O-2 desorption. The ligand-modulated (Fe,Co)OOH exhibits excellent OER performance with low overpotentials and high durability.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Pei Tang, Peng Gao, Xuehao Cui, Zhen Chen, Qingfeng Fu, Zixing Wang, Ying Mo, Hui Liu, Chaohe Xu, Jilei Liu, Jiaxu Yan, Stefano Passerini
Summary: This study investigates the charge storage capability of spinel cobaltites by substituting Co with Zn and Mn, revealing that redox-active cations in octahedral sites contribute to enhanced capacitance. The findings provide a general principle for optimizing pseudocapacitive properties and offer a fundamental understanding of geometrical-site-dependent activity in spinel oxides.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Christoph Doerfelt, Michelle Hammerton, David Martin, Alexander Wellmann, Clara C. Aletsee, Moniek Tromp, Klaus Koehler
Summary: New insights into the catalytic mechanism of copper aluminate spinel catalysts were obtained through systematic studies on their structure and activity, with a focus on the effects of manganese as a catalyst component. Incorporation of manganese stabilizes the spinel structure towards reduction of copper, but also leads to decreased catalytic activity. The catalytic cycle involves a predominantly interface-based reaction mechanism, where protonation and reduction of aldehydes occur on both the spinel and copper nanoparticle surface.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
He Li, Mengyang Xia, Ben Chong, Hang Xiao, Bin Zhang, Bo Lin, Bolun Yang, Guidong Yang
Summary: In this study, a nanoconfined spinel iron cobalt oxide photocatalyst is developed to achieve both N2 enrichment and activation, leading to improved performance in the photocatalytic nitrogen reduction reaction.
Article
Chemistry, Applied
Kakuya Ueda, Masashi Tsuji, Junya Ohyama, Atsushi Satsuma
Summary: Cobalt spinel oxides with octahedral (Oh) and tetrahedral (Td) sites show high activity in NO reduction by CO. By studying cobalt spinel oxides with different CoOh/CoTd ratios, it was determined that the octahedral site is responsible for the NO-CO reaction. In-situ XAFS measurements revealed that cobalt spinel oxides with higher CoOh fraction are more easily reduced by CO, leading to higher activity in NO reduction by CO.
Article
Chemistry, Multidisciplinary
Jianyue Yan, Peng Liu, Jiawen Li, Hao Huang, Wenbo Song
Summary: This study reveals that the CoO6 site is the dominant active site in Co3O4 for NRA through a site substitution strategy. By replacing Co at the tetrahedral site with Ni and Cu, the electronic structure of CoO6 is optimized, resulting in NiCo2O4 exhibiting the best activity for NRA.
Article
Physics, Condensed Matter
Shubhajyoti Mohapatra, Dheeraj Kumar Singh, Rajyavardhan Ray, Sayandip Ghosh, Avinash Singh
Summary: This article investigates the effects of electron filling and crystal field on collective spin-orbital excitations in the Sr2VO4 compound. It finds that an entangled orbital + antiferromagnetic order can be stabilized under appropriate spin-orbit coupling. The results are consistent with observations from high-pressure experiments.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Chemistry, Multidisciplinary
Hongtai Li, Pei Shi, Lei Wang, Tianran Yan, Tong Guo, Xiao Xia, Chi Chen, Jing Mao, Dan Sun, Liang Zhang
Summary: Fundamentally understanding the structure-property relationship is crucial for designing advanced electrocatalysts for Li-S batteries. This study investigates the catalytic activity of spinel oxides for sulfur redox by manipulating regulable cations. It is found that the cooperative catalysis of LiPSs is dominated by the competition between Co3+ tetrahedral and Mn3+ octahedral sites.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Mahmoud Gamal Ahmed, Ying Fan Tay, Xiao Chi, Mengyuan Zhang, Joel Ming Rui Tan, Sing Yang Chiam, Andrivo Rusydi, Lydia Helena Wong
Summary: The discovery of a highly efficient and stable catalyst for oxygen evolution reaction (OER) using high-throughput methods is summarized. The catalyst exhibits remarkable catalytic activity due to the formation of multiple active sites and active oxyhydroxide phase. This work contributes to the rapid identification of new catalysts and the improvement of greener fuel.
Article
Chemistry, Multidisciplinary
Zhiyong Jiang, Xiaodi Zhu, Zhiyu Wang, Wei Liu, Wensheng Yan, Kevin Sivula, Jun Bao
Summary: A simple and versatile molten-salt-mediated strategy is reported to introduce Ni2+ in B-oh sites on the surface of zinc ferrite to promote active sites for PEC water splitting. The introduced Ni2+ and associated neighboring Fe(3-sigma)+ sites function as Ni-Fe dual active sites for PEC water oxidation, leading to significantly enhanced photocurrent density. This work demonstrates a versatile strategy to regulate surface active sites of photoelectrodes for improving PEC solar energy conversion systems.
Article
Chemistry, Physical
Guiqiang Cao, Xifei Li, Ruixian Duan, Kaihua Xu, Kun Zhang, Liping Chen, Qinting Jiang, Jun Li, Jingjing Wang, Ming Li, Ni Wang, Jing Wang, Yukun Xi, Chong Xie, Wenbin Li
Summary: Redistributing the d-orbital of single Fe atom catalysts (SFeACs) is challenging but crucial for optimizing the redox kinetics of lithium sulfur batteries (LSBs). By fabricating Fe-N4/S2C with an increased dz2 and partial occupation of dxz, electron transfer between Fe-N4 and sulfur is promoted, enhancing the conversion of polysulfides and solid products. The lower fill of dxz also facilitates hybridization between Fe and S atoms, reducing the loss of sulfur. Thus, the sulfur cathode with Fe-N4/S2C shows a high capacity and excellent stability, making it a promising candidate for LSBs.
Article
Chemistry, Multidisciplinary
Soyun Kim, Dohun Kim, Kenji Watanabe, Takashi Taniguchi, Jurgen H. Smet, Youngwook Kim
Summary: The authors study integer and fractional quantum Hall states in a stack of two twisted Bernal bilayer graphene sheets. They suppress single-particle tunneling between the bilayers and benefit from strong interlayer Coulombic interactions. A Bose-Einstein condensate is observed for half-filling in each bilayer sheet, but only at orbital index 1. The energy of skyrmion/anti-skyrmion pair excitations is tentatively linked to this discrepancy.
Editorial Material
Chemistry, Physical
Yanwei Lum, Joel W. Ager
Summary: Through isotopic labelling, it has been discovered that there are at least two different active sites on Cu electrocatalysts, one converting CO2 to CO and another converting CO to useful C2+ products.
Article
Chemistry, Multidisciplinary
Yang Peng, Churong Huang, Jingle Huang, Min Feng, Xinzhuo Qiu, Xin Yue, Shaoming Huang
Summary: Spinel oxides, known for their faster kinetics and outstanding catalytic performance, have the potential to be used as non-precious metal electrocatalysts for oxygen evolution reaction (OER). This study focuses on regulating the geometric structures of spinel oxides to enhance their OER performance. By filling the unoccupied octahedral interstices with foreign Fe cations, the synthesized HOoct-NFO NC/IF electrocatalysts show excellent OER performance with faster kinetics and superior stability.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Soumyajit Sarkar, Leeor Kronik
Article
Chemistry, Multidisciplinary
David Rakhmilevitch, Soumyajit Sarkar, Ora Bitton, Leeor Kronik, Oren Tal
Article
Multidisciplinary Sciences
Meital Eckshtain-Levi, Eyal Capua, Sivan Refaely-Abramson, Soumyajit Sarkar, Yulian Gavrilov, Shinto P. Mathew, Yossi Paltiel, Yaakov Levy, Leeor Kronik, Ron Naaman
NATURE COMMUNICATIONS
(2016)
Article
Chemistry, Physical
Soumyajit Sarkar, Jing Yang, Liang Z. Tan, Andrew M. Rappe, Leeor Kronik
CHEMISTRY OF MATERIALS
(2018)
Article
Chemistry, Physical
Cunlan Guo, Soumyajit Sarkar, Sivan Refaely-Abramson, David A. Egger, Tatyana Bendikov, Keiichirou Yonezawa, Yosuke Suda, Takuma Yamaguchi, Israel Pecht, Satoshi Kera, Nobuo Ueno, Mordechai Sheves, Leeor Kronik, David Cahen
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2018)
Article
Multidisciplinary Sciences
Koyel Banerjee-Ghosh, Oren Ben Dor, Francesco Tassinari, Eyal Capua, Shira Yochelis, Amir Capua, See-Hun Yang, Stuart S. P. Parkin, Soumyajit Sarkar, Leeor Kronik, Lech Tomasz Baczewski, Ron Naaman, Yossi Paltiel
Article
Materials Science, Multidisciplinary
Swarnakamal Mukherjee, Soumyajit Sarkar, T. Saha-Dasgupta
JOURNAL OF MATERIALS SCIENCE
(2012)
Article
Chemistry, Multidisciplinary
Ran Vardimon, Tamar Yelin, Marina Klionsky, Soumyajit Sarkar, Ariel Biller, Leeor Kronik, Oren Tal
Article
Chemistry, Physical
Soumyajit Sarkar, Mukul Kabir, Martha Greenblatt, Tanusri Saha-Dasgupta
JOURNAL OF MATERIALS CHEMISTRY A
(2013)
Article
Multidisciplinary Sciences
Atindra Nath Pal, Dongzhe Li, Soumyajit Sarkar, Sudipto Chakrabarti, Ayelet Vilan, Leeor Kronik, Alexander Smogunov, Oren Tal
NATURE COMMUNICATIONS
(2019)
Article
Materials Science, Multidisciplinary
Soumyajit Sarkar, Peter Kratzer
PHYSICAL REVIEW MATERIALS
(2020)
Article
Chemistry, Physical
Soumyajit Sarkar, Peter Kratzer
Summary: In this study, atomic structures at the interface between Au(111) and monolayers of MoS2 and MoSe2 were investigated using first-principles calculations. The focus was on calculating vibrational spectra and comparing them to experimental data. MoSe2 monolayers showed minimal shifts in vibrational modes upon adsorption on Au(111), while MoS2 exhibited the coexistence of two structural models with different characteristics.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Soumyajit Sarkar, Peter Kratzer
Summary: Calculations were performed using the DFT+U approach for three Cr trihalides to determine magnetic exchange interactions and ordering temperatures. The commonly used DC scheme was found to give erroneous results, while other schemes produced more accurate values.
Article
Chemistry, Physical
Naomi Kramer, Soumyajit Sarkar, Leeor Kronik, Nurit Ashkenasy
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2019)
Article
Physics, Fluids & Plasmas
L. Musbat, M. Nihamkin, Y. Toker, J. M. Dilger, D. R. Fuller, T. J. El-Baba, D. E. Clemmer, S. Sarkar, L. Kronik, A. Hirshfeld, N. Friedman, M. Sheves