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arXiv 2025年

作者： Strolger, Louis-Gregory Bovill, Mia Sauda Perlman, Eric Kolobow, Craig Larison, Conor Lane, Zachary G. Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States Johns Hopkins University BaltimoreMD21218 United States Department of Astronomy University of Maryland College ParkMD20742 United States Department of Aerospace Physics and Space Sciences Florida Institute of Technology 150 West University Boulevard MelbourneFL32901 United States Department of Physics & Astronomy Rutgers State University of New Jersey 136 Frelinghuysen Road PiscatawayNJ08854 United States School of Physical and Chemical Sciences — Te Kura Matū University of Canterbury Private Bag 4800 Christchurch Aotearoa8140 New Zealand

We present arguments on the likely origins of supernovae without associated host galaxies from open field, non-clustered, environments. We show why it is unlikely these "hostless" supernovae stem from escaped hyper-velocity stars (HVS) in any appreciable numbers, especially for core-collapse supernovae. It is highly likely that hostless events arise from dwarf host galaxies too faint to be detected in their parent surveys. Several detections and numerous upper limits suggest a large number of field dwarfs, to MV > −14, which themselves may be important to constraining the slope of the low-mass end of the UV luminosity function, understanding galaxy evolution, and putting ΛCDM into context. Moreover, the detailed study of these mass and metallicity-constrained host environments, and the variety of supernovae that occur within them, could provide more stringent constraints on the nature of progenitor systems. © 2025, CC BY.

关键词： Supernovae

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Isostructural metal-insulator transition driven by dimensional-crossover in SrIrO3 heterostructures

arXiv

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arXiv 2021年

作者： Kong, Shuai Li, Lei Lu, Zengxing Feng, Jiatai Zheng, Xuan Song, Pengbo Shi, You-Guo Wang, Yumei Ge, Binghui Rolfs, Katharina Pomjakushina, Ekaterina Schmitt, Thorsten Plumb, Nicholas C. Shi, Ming Zhong, Zhicheng Radovic, Milan Wang, Zhiming Li, Run-Wei Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China Department of Chemical and Environmental Engineering The University of Nottingham Ningbo315042 China Institute of Physics Chinese Academy of Sciences Beijing10084 China Institutes of Physical Science and Information Technology Anhui University Hefei230601 China Laboratory for Multiscale Materials Experiments Paul Scherrer Institut Villigen PSICH-5232 Switzerland Swiss Light Source Paul Scherrer Institut Villigen PSICH-5232 Switzerland SwissFEL Paul Scherrer Institut Villigen PSICH-5232 Switzerland

Dimensionality reduction induced metal-insulator transitions in oxide heterostructures are usually coupled with structural and magnetic phase transitions, which complicate the interpretation of the underlying physics. Therefore, achieving isostructural MIT is of great importance for fundamental physics and even more for applications. Here, we report an isostructural metal-insulator transition driven by dimensional-crossover in spin-orbital coupled SrIrO3 films. By using in-situ pulsed laser deposition and angle-resolved photoemission spectroscopy, we synthesized and investigated the electronic structure of SrIrO3 ultrathin films with atomic-layer precision. Through inserting orthorhombic CaTiO3 buffer layers, we demonstrate that the crystal structure of SrIrO3 films remains bulk-like with similar oxygen octahedra rotation and tilting when approaching the ultrathin limit. We observe that a dimensional-crossover metal-insulator transition occurs in isostructural SrIrO3 films. Intriguingly, we find the bandwidth of Jeff=3/2 states reduces with lowering the dimensionality and drives the metal-insulator transition. Our results establish a bandwidth controlled metal-insulator transition in the isostructural SrIrO3 thin films. © 2021, CC BY.

关键词： Pulsed laser deposition

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Bioactivity, Efficacy, and Safety of a Wound Healing Ointment With Medicinal Plant Bioactives: In Vitro and In Vivo Preclinical Evaluations

Scientific World Journal

引用

Scientific World Journal 2025年第1期2025卷 9466270页

作者： Floriano, Juliana Ferreira Rodrigues, Daniel Ohara, Rie Almeida, Nara Lígia Martins Lara, Vanessa Soares Sartorelli, Patricia Graeff, Carlos Frederico de Oliveira Grecco, Simone dos Santos González, Alejandra Hortencia Miranda D’Alpino, Paulo Henrique Perlatti Imperial College London National Heart and Lung Institute imperial.ac.uk GBR London United Kingdom Botucatu Medical School São Paulo State University (UNESP) São Paulo unesp.br BRA Botucatu Brazil Bioengineering and Biomaterials Group School of Pharmaceutical Sciences São Paulo State University (UNESP) unesp.br BRA Araraquara São Paulo Brazil Biotechnology and Innovation in Health Program Universidade Anhanguera de São Paulo (UNIAN) São Paulo BRA Brazil Brazil Department of Health Management Fundação Nacional de Gestão de Saúde São Paulo Brazil Undergraduate Program Medical School Universidade Nove de Julho Bauru São Paulo Brazil Department of Surgery Stomatology Pathology and Radiology Bauru School of Dentistry University of São Paulo (USP) São Paulo usp.br BRA Bauru Brazil Department of Chemistry Institute of Environmental Chemical and Pharmaceutical Sciences Federal University of São Paulo São Paulo unifesp.br BRA Diadema Brazil Department of Physics School of Sciences POSMAT-Post-Graduate Program in Materials Science and Technology São Paulo State University (UNESP) São Paulo Bauru Brazil Department of Research and Development (RD) and Innovation Center Triplet Biotechnology Solutions Inc Bauru São Paulo Brazil Post-Graduate Program in Dentistry Uniderp Anhanguera University Mato Grosso do Sul Campo Grande Brazil Post-Graduate Program in Integrated Dental Sciences University of Cuiabá (UNIC) Mato Grosso do Sul Cuiabá Brazil Department of Physics School of Sciences São Paulo State University (UNESP) São Paulo unesp.br BRA Bauru Brazil

Chronic wounds have a significant impact on patients’ quality of life, necessitating the management of pain, infection, bleeding, and emotional challenges. Debridement, which involves the removal of nonviable tissue, is crucial for promoting wound healing. In addition to surgical methods, cost-effective alternatives such as local solutions and ointments with biological properties have been explored. The use of natural compounds with anti-inflammatory, antibacterial, and collagen-synthesizing abilities holds promise for wound healing. This in vitro and in vivo preclinical study aimed to assess the safety and effectiveness of a wound healing ointment containing bioactive ingredients derived from medicinal plants (extracts, essential oils, and vegetable oils). The chemical composition of the ointment was characterized using Fourier transform infrared (FTIR) spectroscopy to gain insights into its synergistic action. Preclinical tests were conducted following standardized protocols. FTIR analysis revealed similarities between the product’s spectrum and that of bioactive compounds. The in vitro tests demonstrated that all formulations of the ointment induced no cell death, DNA damage, or acute toxicity in cell cultures (p < 0.05). No lethal dose was observed, indicating the safety of the ointment at all concentrations. The ointment also stimulated a notably more organized, significantly higher collagen production compared to control groups (p < 0.05). In vivo preclinical analyses also demonstrated no adverse responses being effective in the healing process compared to the control group (silver sulfadiazine) in terms of wound contraction and ulcer re-epithelization (p < 0.05). Significantly higher means of wound contraction were observed in the groups treated with the bioactive-containing ointment when compared to both the positive control group (sulfadiazine) and the control untreated groups (p < 0.05). The regenerative ointment exhibited excellent biocompatibility and bi

关键词： biocompatibility chronic wounds natural compounds preclinical tests wound care

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Efficient parallel linear scaling method to get the response density matrix in all-electron real-space density-functional perturbation theory

arXiv

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arXiv 2020年

作者： Shang, Honghui Liang, Wanzhen Zhang, Yunquan Yang, Jinlong State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials Fujian Provincial KeyLaboratory of Theoretical and Computational Chemistry Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University XiamenFujian361005 China Hefei National Laboratory for Physical Sciences at Microscale Department of Chemical Physics Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China

The real-space density-functional perturbation theory (DFPT) for the computations of the response properties with respect to the atomic displacement and homogeneous electric field perturbation has been recently developed and implemented into the all-electron, numeric atom-centered orbitals electronic structure package FHI-aims. It is found that the bottleneck for large scale applications is the computation of the response density matrix, which scales as O(N3). Here for the response properties with respect to the homogeneous electric field, we present an efficient parallel linear scaling algorithm for the response density matrix calculation. Our scheme is based on the second-order trace-correcting purification and the parallel sparse matrix-matrix multiplication algorithms. The new scheme reduces the formal scaling from O(N3) to O(N), and shows good parallel scalability over tens of thousands of cores. As demonstrated by extensive validation, we achieve a rapid computation of accurate polarizabilities using DFPT. Finally, the computational efficiency of this scheme has been illustrated by making the scaling tests and scalability tests on massively parallel computer systems. Copyright © 2020, The Authors. All rights reserved.

关键词： Matrix algebra

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Superfluidity and pairing phenomena in ultracold atomic Fermi gases in one-dimensional optical lattices. II. Effects of population imbalance

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physical Review A 2020年第5期101卷 053618-053618页

作者： Jibiao Wang Lin Sun Qiang Zhang Leifeng Zhang Yi Yu Chaohong Lee Qijin Chen Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing & School of Physics and Astronomy Sun Yat-Sen University (Zhuhai Campus) Zhuhai Guangdong 519082 China Department of Physics and Zhejiang Institute of Modern Physics Zhejiang University Hangzhou Zhejiang 310027 China College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang 310014 China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University (Guangzhou Campus) Guangzhou Guangdong 510275 China Shanghai Branch National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Shanghai 201315 China Synergetic Innovation Center of Quantum Information and Quantum Physics Hefei Anhui 230026 China

In this paper, we study the effect of population imbalance and its interplay with pairing strength and lattice effect in atomic Fermi gases in a one-dimensional optical lattice. We compute various phase diagrams as the system undergoes BCS-BEC crossover, using the same pairing fluctuation theory as in Part I of this work [Phys. Rev. A 101, 053617 (2020)]. We find widespread pseudogap phenomena beyond the BCS regime and intermediate temperature superfluid states for relatively low population imbalances. The Fermi surface topology plays an important role in the behavior of Tc. For large d and/or small t, which yield an open Fermi surface, superfluidity can be readily destroyed by a small amount of population imbalance p. The superfluid phase, especially in the BEC regime, can exist only for a highly restricted volume of the parameter space. An open Fermi surface often leads to destruction of the superfluid ground state in the BEC regime. Due to the continuum-lattice mixing, population imbalance gives rise to a new mechanism for pair hopping, as assisted by excessive majority fermions, which may lead to significant enhancement of Tc on the BEC side of the Feshbach resonance, and also render Tc approaching a constant asymptote in the BEC limit, when it exists. Furthermore, we find that not all minority fermions will be paired up in BEC limit, unlike the 3D continuum case. These predictions can be tested in future experiments.

关键词： Cold gases in optical lattices Fermi gases Fermionic condensates Superconducting phase transition

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Direct Linearly-Polarised Electroluminescence from Perovskite Nanoplatelet Superlattices

arXiv

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arXiv 2023年

作者： Ye, Junzhi Ren, Aobo Dai, Linjie Baikie, Tomi Guo, Renjun Pal, Debapriya Gorgon, Sebastian Heger, Julian E. Huang, Junyang Sun, Yuqi Arul, Rakesh Grimaldi, Gianluca Zhang, Kaiwen Shamsi, Javad Huang, Yi-Teng Wang, Hao Wu, Jiang Koenderink, A. Femius Murciano, Laura Torrente Schwartzkopf, Matthias Roth, Stephen V. Müller-Buschbaum, Peter Baumberg, Jeremy J. Stranks, Samuel D. Greenham, Neil C. Polavarapu, Lakshminarayana Zhang, Wei Rao, Akshay Hoye, Robert L.Z. Cavendish Laboratory University of Cambridge JJ Thomson Ave CambridgeCB3 0HE United Kingdom Inorganic Chemistry Laboratory University of Oxford South Parks Road OxfordOX1 3QR United Kingdom Advanced Technology Institute University of Surrey Guildford United Kingdom Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu China Lehrstuhl für Funktionelle Materialien Physik-Department Technische Universität München James-Franck-Str. 1 Garching85748 Germany Centre for Nanophotonics AMOLF Amsterdam1098 XG Netherlands Department of Chemical Engineering and Biotechnology University of Cambridge CambridgeCB3 0AS United Kingdom Division of Electrical Engineering Department of Engineering University of Cambridge Cambridge United Kingdom Notkestrasse 85 HamburgD-22607 Germany Department of Fibre and Polymer Technology KTH Royal Institute of Technology Teknikringen 56–58 Stockholm10044 Sweden Technische Universität München Lichtenbergstr. 1 GarchingD-85748 Germany CINBIO Universidade de Vigo Materials Chemistry and Physics Group Department of Physical Chemistry Campus Universitario As Lagoas Marcosende Vigo36310 Spain Department of Materials Imperial College London Exhibition Road LondonSW7 2AZ United Kingdom

Polarised light is critical for a wide range of applications, but is usually generated by filtering unpolarised light, which leads to significant energy losses and requires additional optics. Herein, the direct emission of linearly-polarised light is achieved from light-emitting diodes (LEDs) made of CsPbI3 perovskite nanoplatelet superlattices. Through use of solvents with different vapour pressures, the self-assembly of perovskite nanoplatelets is achieved to enable fine control over the orientation (either face-up or edge-up) and therefore the transition dipole moment. As a result of the highly-uniform alignment of the nanoplatelets, as well as their strong quantum and dielectric confinement, large exciton fine-structure splitting is achieved at the film level, leading to pure-red LEDs exhibiting a high degree of linear polarisation of 74.4% without any photonic structures. This work unveils the possibilities of perovskite nanoplatelets as a highly promising source of linearly-polarised electroluminescence, opening up the development of next-generation 3D displays and optical communications from this highly versatile, solution-processable system. © 2023, CC BY.

关键词： Perovskite

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Measurement of the Inclusive and Differential Higgs Boson Production Cross Sections in the Decay Mode to a Pair of τ Leptons in pp Collisions at s=13 TeV

引用

physical Review Letters 2022年第8期128卷 081805-081805页

作者： A. Tumasyan W. Adam J. W. Andrejkovic T. Bergauer S. Chatterjee M. Dragicevic A. Escalante Del Valle R. Frühwirth M. Jeitler N. Krammer L. Lechner D. Liko I. Mikulec P. Paulitsch F. M. Pitters J. Schieck R. Schöfbeck D. Schwarz S. Templ W. Waltenberger C.-E. Wulz V. Chekhovsky A. Litomin V. Makarenko M. R. Darwish E. A. De Wolf T. Janssen T. Kello A. Lelek H. Rejeb Sfar P. Van Mechelen S. Van Putte N. Van Remortel F. Blekman E. S. Bols J. D’Hondt M. Delcourt H. El Faham S. Lowette S. Moortgat A. Morton D. Müller A. R. Sahasransu S. Tavernier W. Van Doninck P. Van Mulders D. Beghin B. Bilin B. Clerbaux G. De Lentdecker L. Favart A. Grebenyuk A. K. Kalsi K. Lee M. Mahdavikhorrami I. Makarenko L. Moureaux L. Pétré A. Popov N. Postiau E. Starling L. Thomas M. Vanden Bemden C. Vander Velde P. Vanlaer L. Wezenbeek T. Cornelis D. Dobur J. Knolle L. Lambrecht G. Mestdach M. Niedziela C. Roskas A. Samalan K. Skovpen M. Tytgat B. Vermassen M. Vit A. Benecke A. Bethani G. Bruno F. Bury C. Caputo P. David C. Delaere I. S. Donertas A. Giammanco K. Jaffel Sa. Jain V. Lemaitre K. Mondal J. Prisciandaro A. Taliercio M. Teklishyn T. T. Tran P. Vischia S. Wertz G. A. Alves C. Hensel A. Moraes W. L. Aldá Júnior M. Alves Gallo Pereira M. Barroso Ferreira Filho H. Brandao Malbouisson W. Carvalho J. Chinellato E. M. Da Costa G. G. Da Silveira D. De Jesus Damiao S. Fonseca De Souza D. Matos Figueiredo C. Mora Herrera K. Mota Amarilo L. Mundim H. Nogima P. Rebello Teles A. Santoro S. M. Silva Do Amaral A. Sznajder M. Thiel F. Torres Da Silva De Araujo A. Vilela Pereira C. A. Bernardes L. Calligaris T. R. Fernandez Perez Tomei E. M. Gregores D. S. Lemos P. G. Mercadante S. F. Novaes Sandra S. Padula A. Aleksandrov G. Antchev R. Hadjiiska P. Iaydjiev M. Misheva M. Rodozov M. Shopova G. Sultanov A. Dimitrov T. Ivanov L. Litov B. Pavlov P. Petkov A. Petrov T. Cheng T. Javaid M. Mittal L. Yuan M. Ahmad G. Bauer C. Dozen Z. Hu J. Martins Y. Wang K. Yi E. Chapon G. M. Chen H. S. Chen M. Chen F. Iemmi A. Kapoor D. Leggat H. Liao Z.-A. Liu V. Mi Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Korea University Seoul Korea Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China Massachusetts Institute of Technology Cambridge Massachusetts USA State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China The University of Kansas Lawrence Kansas USA Sun Yat-Sen University Guangzhou China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE)—Fudan University Shanghai China Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physics

Measurements of the inclusive and differential fiducial cross sections of the Higgs boson are presented, using the τ lepton decay channel. The differential cross sections are measured as functions of the Higgs boson transverse momentum, jet multiplicity, and transverse momentum of the leading jet in the event, if any. The analysis is performed using proton-proton collision data collected with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb−1. These are the first differential measurements of the Higgs boson cross section in the final state of two τ leptons. In final states with a large jet multiplicity or with a Lorentz-boosted Higgs boson, these measurements constitute a significant improvement over measurements performed in other final states.

关键词： Particle production Higgs bosons Tau leptons Hadron colliders

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Improving the Selectivity and Stability of Supported Cobalt Catalysts via Static Bi-Doping and Dynamic Trace CO2Co-Feeding During Propane Dehydrogenation

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Angewandte Chemie 2024年第3期137卷

作者： Yongbin Yao Jingnan Wang Qiang Liu Can Yu Zhan Gao Fangli Yuan Prof. Xi Wang Department of Physics School of Physical Science and Engineering Beijing Jiaotong University Beijing 100044 P. R. China Tangshan Research Institute of Beijing Jiaotong University Tangshan City Hebei Beijing 100044 P. R. China Institute of Molecular Engineering Plus College of Chemistry Fuzhou University Fuzhou 350108 P. R. China School of Chemical Engineering and Technology Tianjin University Tianjin 300072 P. R. China Institute of High Energy Physics Chinese Academy of Sciences (CAS) Beijing 100049 China State Key Laboratory of Multi-phase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 PR China

Simultaneously enhancing selectivity and stability on supported propane dehydrogenation (PDH) catalysts remains a formidable challenge. Here, we report a combined static and dynamic strategy to address these issues synergistically. Firstly, we demonstrate a feasible sol-gel method for preparing atomically-dispersed Bi-decorated metal nanoparticle catalysts (MBi/Al 2 O 3 , M=Fe, Co, Ni, and Zn). In PDH testing, the total selectivity of by-products (CH 4 and C 2 H 6 ) significantly decreases to 4 % for CoBi catalysts due to the static Bi-doping, compared with 16 % for Co-supported catalysts. Secondly, to enhance catalytic stability, we introduce a dynamic trace CO 2 co-feeding route. 10CoBi/Al 2 O 3 catalysts exhibit superior durability against coke formation for 330 hours in PDH under a 40 % C 3 H 8 atmosphere followed by pure C 3 H 8 conditions at 600 °C while maintaining propylene selectivity at 96 %. Notably, introducing trace CO 2 leads to a remarkable 6-fold decrease in the deactivation rate constant ( k d ). Multiple characterizations and density functional theory calculations reveal that charge transfer from atomically-distributed Bi to Co nanoparticles benefits lowering the energy of C 3 H 6 adsorption thereby suppressing by-products. Furthermore, the dynamic co-feeding of trace CO 2 facilitates coke removal, suppressing catalyst deactivation. The static Bi-doping and dynamic trace CO 2 co-feeding strategy contributes simultaneously to increased selectivity and stability on supported PDH catalysts.

关键词： Static Bi-doping Dynamic trace CO2 co-feeding Cobalt Heterogeneous catalysis Propane dehydrogenation

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Inside Back Cover: Neighbouring Synergy in High-Density Single Ir Atoms on CoGaOOH for Efficient Alkaline Electrocatalytic Oxygen Evolution (Angew. Chem. Int. Ed. 32/2024)

引用

Angewandte Chemie International Edition 2024年第32期63卷

作者： Dr. Peiyu Ma Dr. Heng Cao Qi Hao Ruyang Wang Wanting Liu Ming Zuo Dr. Chuanyi Jia Dr. Zhirong Zhang Prof. Dr. Jun Bao National Synchrotron Radiation Laboratory Key Laboratory of Precision and Intelligent Chemistry iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) University of Science and Technology of China Hefei Anhui 230026 P. R. China School of Engineering Westlake University Hangzhou Zhejiang 310030 P. R. China Hefei National Research Center for Physical Sciences at the Microscale Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences Key Laboratory of Surface and Interface Chemistry Energy Catalysis of Anhui Higher Education Institutes Department of Chemical Physics University of Science and Technology of China Hefei Anhui 230026 P. R. China Guizhou Provincial Key Laboratory of Computational Nano-Material Science Institute of Applied Physics Guizhou Education University Guiyang Guizhou 550018 P. R. China

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Neighbouring Synergy in High-Density Single Ir Atoms on CoGaOOH for Efficient Alkaline Electrocatalytic Oxygen Evolution

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Angewandte Chemie 2024年第32期136卷

The catalytic performance of single-atom catalysts was strictly limited by isolated single-atom sites. Fabricating high-density single atoms to realize the synergetic interaction in neighbouring single atoms could optimize the adsorption behaviors of reaction intermediates, which exhibited great potential to break performance limitations and deepen mechanistic understanding of electrocatalysis. However, the catalytic behavior governed by neighbouring single atoms is particularly elusive and has yet to be understood. Herein, we revealed that the synergetic interaction in neighbouring single atoms contributes to superior performance for oxygen evolution relative to isolated Ir single atoms. Neighbouring single atoms was achieved by fabricating high-density single atoms to narrow the distance between single atoms. Electrochemical measurements demonstrated that the Nei-Ir 1 /CoGaOOH with neighbouring Ir single atoms exhibited a low overpotential of 170 mV at a current density of 10 mA cm −2 , and long-durable stability over 2000 h for oxygen evolution. Mechanistic studies revealed that neighbouring single atoms synergetic stabilized the *OOH intermediates via extra hydrogen bonding interactions, thus significantly reducing the reaction energy barriers, as compared to isolated Ir single atoms. The discovery of the synergetic interaction in neighbouring single atoms could offer guidance for the development of efficient electrocatalysts, thus accelerating the world‘s transition to sustainable energy.

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