1
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Zhang B, Zhang D, Bao J, Han C, Song P, Xu W. Revealing the heterogeneous catalytic kinetics of PtRu nanocatalysts at the single particle level. Analyst 2024. [PMID: 39258315 DOI: 10.1039/d4an01017e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2024]
Abstract
Comparison of the structural features and catalytic performance of bimetallic nanocatalysts will help to develop a unified understanding of structure-reaction relationships. The single-molecule fluorescence technique was utilized to reveal the differences in catalytic kinetics among PtRu bimetallic nanocatalysts and Pt and Ru monometallic nanocatalysts at the single particle level. The results show that bimetallic nanocatalysts have higher apparent rate constants and desorption rate constants relative to monometallic nanocatalysts, which leads to their higher catalytic activity. At the single particle level, bimetallic nanocatalysts have a wider distribution of apparent rate constants, suggesting that bimetallic nanocatalysts have higher activity heterogeneity relative to monometallic nanocatalysts. By investigating the relationship between the reaction rate and the rate of dynamic activity fluctuations, it was found that spontaneous surface restructuring and reaction-induced surface restructuring of nanoparticles occurred. The surface of bimetallic nanoparticles restructured faster, which made the bimetallic nanocatalysts more active. These findings provide new insights into the design of highly active bimetallic nanocatalysts.
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Affiliation(s)
- Bowei Zhang
- State Key Laboratory of Electroanalytical Chemistry, Jilin Provincial Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China.
| | - Dezheng Zhang
- State Key Laboratory of Electroanalytical Chemistry, Jilin Provincial Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China.
| | - Jinpeng Bao
- State Key Laboratory of Electroanalytical Chemistry, Jilin Provincial Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Ce Han
- State Key Laboratory of Electroanalytical Chemistry, Jilin Provincial Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Ping Song
- State Key Laboratory of Electroanalytical Chemistry, Jilin Provincial Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Weilin Xu
- State Key Laboratory of Electroanalytical Chemistry, Jilin Provincial Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China.
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2
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Zhu J, Lu XF, Luan D, Lou XWD. Metal-Organic Frameworks Derived Carbon-Supported Metal Electrocatalysts for Energy-Related Reduction Reactions. Angew Chem Int Ed Engl 2024:e202408846. [PMID: 39031731 DOI: 10.1002/anie.202408846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Revised: 06/20/2024] [Accepted: 06/20/2024] [Indexed: 07/22/2024]
Abstract
Electrochemical reduction reactions, as cathodic processes in many energy-related devices, significantly impact the overall efficiency determined mainly by the performance of electrocatalysts. Metal-organic frameworks (MOFs) derived carbon-supported metal materials have become one of star electrocatalysts due to their tunable structure and composition through ligand design and metal screening. However, for different electroreduction reactions, the required active metal species vary in phase component, electronic state, and catalytic center configuration, hence requiring effective customization. From this perspective, this review comprehensively analyzes the structural design principles, metal loading strategies, practical electroreduction performance, and complex catalytic mechanisms, thereby providing insights and guidance for the future rational design of such electroreduction catalysts.
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Affiliation(s)
- Jiawei Zhu
- Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, China
- Hong Kong Branch of National Precious Metals Material Engineering Research Center, City University of Hong Kong, Hong Kong, 999077, China
| | - Xue Feng Lu
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou, 350108, China
| | - Deyan Luan
- Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, China
| | - Xiong Wen David Lou
- Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, China
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3
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Saqib M, Zafar M, Halawa MI, Murtaza S, Kamal GM, Xu G. Nanoscale Luminescence Imaging/Detection of Single Particles: State-of-the-Art and Future Prospects. ACS MEASUREMENT SCIENCE AU 2024; 4:3-24. [PMID: 38404493 PMCID: PMC10885340 DOI: 10.1021/acsmeasuresciau.3c00052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/28/2023] [Accepted: 11/13/2023] [Indexed: 02/27/2024]
Abstract
Single-particle-level measurements, during the reaction, avoid averaging effects that are inherent limitations of conventional ensemble strategies. It allows revealing structure-activity relationships beyond averaged properties by considering crucial particle-selective descriptors including structure/morphology dynamics, intrinsic heterogeneity, and dynamic fluctuations in reactivity (kinetics, mechanisms). In recent years, numerous luminescence (optical) techniques such as chemiluminescence (CL), electrochemiluminescence (ECL), and fluorescence (FL) microscopies have been emerging as dominant tools to achieve such measurements, owing to their diversified spectroscopy principles, noninvasive nature, higher sensitivity, and sufficient spatiotemporal resolution. Correspondingly, state-of-the-art methodologies and tools are being used for probing (real-time, operando, in situ) diverse applications of single particles in sensing, medicine, and catalysis. Herein, we provide a concise and comprehensive perspective on luminescence-based detection and imaging of single particles by putting special emphasis on their basic principles, mechanistic pathways, advances, challenges, and key applications. This Perspective focuses on the development of emission intensities and imaging based individual particle detection. Moreover, several key examples in the areas of sensing, motion, catalysis, energy, materials, and emerging trends in related areas are documented. We finally conclude with the opportunities and remaining challenges to stimulate further developments in this field.
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Affiliation(s)
- Muhammad Saqib
- Institute
of Chemistry, Khawaja Fareed University
of Engineering and Information Technology, Rahim Yar Khan 64200, Pakistan
| | - Mariam Zafar
- Institute
of Chemistry, Khawaja Fareed University
of Engineering and Information Technology, Rahim Yar Khan 64200, Pakistan
| | - Mohamed Ibrahim Halawa
- Department
of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt
- Department
of Chemistry, College of Science, United
Arab Emirates University, Al Ain 15551, United Arab
Emirates
| | - Shahzad Murtaza
- Institute
of Chemistry, Khawaja Fareed University
of Engineering and Information Technology, Rahim Yar Khan 64200, Pakistan
| | - Ghulam Mustafa Kamal
- Institute
of Chemistry, Khawaja Fareed University
of Engineering and Information Technology, Rahim Yar Khan 64200, Pakistan
| | - Guobao Xu
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of
Sciences, 5625 Renmin
Street, Changchun, Jilin 130022, China
- School
of Applied Chemistry and Engineering, University
of Science and Technology of China, Hefei 230026, China
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4
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Gao N, Ren G, Zhang M, Mao L. Electroless Deposition of Palladium Nanoparticles on Graphdiyne Boosts Electrochemiluminescence. J Am Chem Soc 2024; 146:3836-3843. [PMID: 38306697 DOI: 10.1021/jacs.3c11009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2024]
Abstract
Modulating the electronic structure of metal nanoparticles via metal-support interaction has attracted intense interest in the field of catalytic science. However, the roles of supporting substrates in regulating the catalytic properties of electrochemiluminescence (ECL) remain elusive. Here, we find that the use of graphdiyne (GDY) as the substrate for electroless deposition of Pd nanoparticles (Pd/GDY) produces the most pronounced anodic signal enhancement in luminol-dissolved oxygen (O2) ECL system as co-reactant accelerator over other carbon-based Pd composite nanomaterials. Pd/GDY exhibits electrocatalytic activity for the reduction of O2 through a four-electron pathway at approximately -0.059 V (vs Ag/AgCl) in neutral solution forming reactive oxygen species (ROS) as intermediates. The study shows that the interaction of Pd and GDY increases the amount and stability of ROS on the Pd/GDY electrode surface and promotes the reaction of ROS and luminol anion radical to generate excited luminol, which significantly boosts the luminol anodic ECL emission. Based on quenching of luminol ECL through the consumption of ROS by antioxidants, we develop a platform for the detection of intracellular antioxidants. This study provides an avenue for the development of efficient luminol ECL systems in neutral media and expands the biological application of ECL systems.
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Affiliation(s)
- Nan Gao
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Guoyuan Ren
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Meining Zhang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Lanqun Mao
- College of Chemistry, Beijing Normal University, Beijing 100875, China
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5
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Freese T, Meijer JT, Brands MB, Alachouzos G, Stuart MCA, Tarozo R, Gerlach D, Smits J, Rudolf P, Reek JNH, Feringa BL. Iron oxide-promoted photochemical oxygen reduction to hydrogen peroxide (H 2O 2). EES CATALYSIS 2024; 2:262-275. [PMID: 38222062 PMCID: PMC10782808 DOI: 10.1039/d3ey00256j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 11/03/2023] [Indexed: 01/16/2024]
Abstract
Hydrogen peroxide (H2O2) is a valuable green oxidant with a wide range of applications. Furthermore, it is recognized as a possible future energy carrier achieving safe operation, storage and transportation. The photochemical production of H2O2 serves as a promising alternative to the waste- and energy-intensive anthraquinone process. Following the 12 principles of Green Chemistry, we demonstrate a facile and general approach to sustainable catalyst development utilizing earth-abundant iron and biobased sources only. We developed several iron oxide (FeOx) nanoparticles (NPs) for successful photochemical oxygen reduction to H2O2 under visible light illumination (445 nm). Achieving a selectivity for H2O2 of >99%, the catalyst material could be recycled for up to four consecutive rounds. An apparent quantum yield (AQY) of 0.11% was achieved for the photochemical oxygen reduction to H2O2 with visible light (445 nm) at ambient temperatures and pressures (9.4-14.8 mmol g-1 L-1). Reaching productivities of H2O2 of at least 1.7 ± 0.3 mmol g-1 L-1 h-1, production of H2O2 was further possible via sunlight irradiation and in seawater. Finally, a detailed mechanism has been proposed on the basis of experimental investigation of the catalyst's properties and computational results.
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Affiliation(s)
- Thomas Freese
- Stratingh Institute for Chemistry, University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
| | - Jelmer T Meijer
- Stratingh Institute for Chemistry, University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
| | - Maria B Brands
- van't Hoff Institute for Molecular Sciences, University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands
| | - Georgios Alachouzos
- Stratingh Institute for Chemistry, University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
| | - Marc C A Stuart
- Electron Microscopy, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen Nijenborgh 7 9747AG Groningen The Netherlands
| | - Rafael Tarozo
- Stratingh Institute for Chemistry, University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
| | - Dominic Gerlach
- Zernike Institute for Advanced Materials, University of Groningen Nijenborgh 4 9747AG Groningen The Netherlands
| | - Joost Smits
- Shell Global Solutions International BV Grasweg 31 1031 HW Amsterdam The Netherlands
| | - Petra Rudolf
- Zernike Institute for Advanced Materials, University of Groningen Nijenborgh 4 9747AG Groningen The Netherlands
| | - Joost N H Reek
- van't Hoff Institute for Molecular Sciences, University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands
| | - Ben L Feringa
- Stratingh Institute for Chemistry, University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
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6
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Huang L, Liu Q, Wu W, Gao G, Zheng X, Wang J, Dong S. Identifying the active sites in unequal iron-nitrogen single-atom catalysts. Nat Commun 2023; 14:5594. [PMID: 37696805 PMCID: PMC10495408 DOI: 10.1038/s41467-023-41311-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 08/28/2023] [Indexed: 09/13/2023] Open
Abstract
Single-atom catalysts (SACs) have become one of the most attractive frontier research fields in catalysis and energy conversion. However, due to the atomic heterogeneity of SACs and limitations of ensemble-averaged measurements, the essential active sites responsible for governing specific catalytic properties and mechanisms remain largely concealed. In this study, we develop a quantitative method of single-atom catalysis-fluorescence correlation spectroscopy (SAC-FCS), leveraging the atomic structure-dependent catalysis kinetics and single-turnover resolution of single-molecule fluorescence microscopy. This method enables us to investigate the oxidase-like single-molecule catalysis on unidentical iron-nitrogen (Fe-N) coordinated SACs, quantifying the active sites and their kinetic parameters. The findings reveal the significant differences of single sites from the average behaviors and corroborate the oxidase-like catalytic mechanism of the Fe-N active sites. We anticipate that the method will give essential insights into the rational design and application of SACs.
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Affiliation(s)
- Liang Huang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Qiong Liu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Weiwei Wu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Ge Gao
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Xiliang Zheng
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Jin Wang
- Center for Theoretical Interdisciplinary Sciences Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, 325001, China.
- Department of Chemistry and Physics, State University of New York at Stony Brook, Stony Brook, NY, 11794-3400, USA.
| | - Shaojun Dong
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, China.
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7
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Chen X, Yang Y, Ye G, Liu S, Liu J. Chiral Ruthenium Nanozymes with Self-Cascade Reaction Driven the NO Generation Induced Macrophage M1 Polarization Realizing the Lung Cancer "Cocktail Therapy". SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023:e2207823. [PMID: 37029560 DOI: 10.1002/smll.202207823] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 02/20/2023] [Indexed: 06/19/2023]
Abstract
Macrophages as the main cause of cancer immunosuppression, how to effectively induce macrophage M1 polarization remain the major challenge in lung cancer therapy. Herein, inspired by endogenous reactions, a strategy is proposed to coactivate macrophage M1 polarization by reactive oxygen species (ROS) and nitric oxide (NO) with self-autocatalytic cascade reaction. To enhance the generation of NO and ROS, NO Precursor-Arginine as capping agents for inducing synthesis two kinds of chiral ruthenium nanozyme (D/L-Arginine@Ru). Under the properties of Ru nanozymes through synchronously mimicking the activity of oxidase and nitric oxide synthase (NOS), chiral Ru nanozyme can rapidly generate 1 O2 and O2 at first stage, and then catalyze Arginine to produce sufficient NO, thus enhance macrophage M1 polarization to reverse tumor immunosuppression. Moreover, combination the antitumor activity of 1 O2 , NO, the chiral Ru nanozymes realize the "cocktail therapy" by inducing tumor cell apoptosis as well as ferroptosis. In addition, the chirality influences the bioactivity of Ru nanozymes that L-Arginine@Ru shows the better therapeutic effect with stronger catalytic activity and natural homology. It is hoped the high performance of chiral Ru nanozyme with "cocktail therapy" is an effective therapeutic reagent and can provide a feasible treatment strategy for tumor catalytic therapy.
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Affiliation(s)
- Xu Chen
- College of Chemistry and Materials Science, The First Affiliated Hospital of Jinan University, Jinan University, Guangzhou, 510632, P. R. China
- Department of Rheumatology and Immunology, Guangdong Second Provincial General Hospital, Guangzhou, 510317, P. R. China
| | - Yonglan Yang
- College of Chemistry and Materials Science, The First Affiliated Hospital of Jinan University, Jinan University, Guangzhou, 510632, P. R. China
| | - Gang Ye
- College of Chemistry and Materials Science, The First Affiliated Hospital of Jinan University, Jinan University, Guangzhou, 510632, P. R. China
| | - Shengming Liu
- College of Chemistry and Materials Science, The First Affiliated Hospital of Jinan University, Jinan University, Guangzhou, 510632, P. R. China
| | - Jie Liu
- College of Chemistry and Materials Science, The First Affiliated Hospital of Jinan University, Jinan University, Guangzhou, 510632, P. R. China
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8
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Wu K, Chen R, Zhou Z, Chen X, Lv Y, Ma J, Shen Y, Liu S, Zhang Y. Elucidating Electrocatalytic Oxygen Reduction Kinetics via Intermediates by Time-Dependent Electrochemiluminescence. Angew Chem Int Ed Engl 2023; 62:e202217078. [PMID: 36591995 DOI: 10.1002/anie.202217078] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 12/30/2022] [Accepted: 01/02/2023] [Indexed: 01/03/2023]
Abstract
Facile evaluation of oxygen reduction reaction (ORR) kinetics for electrocatalysts is critical for sustainable fuel-cell development and industrial H2 O2 production. Despite great success in ORR studies using mainstream strategies, such as the membrane electrode assembly, rotation electrodes, and advanced surface-sensitive spectroscopy, the time and spatial distribution of reactive oxygen species (ROS) intermediates in the diffusion layer remain unknown. Using time-dependent electrochemiluminescence (Td-ECL), we report an intermediate-oriented method for ORR kinetics analysis. Owing to multiple ultrasensitive stoichiometric reactions between ROS and the ECL emitter, except for electron transfer numbers and rate constants, the potential-dependent time and spatial distribution of ROS were successfully obtained for the first time. Such exclusively uncovered information would guide the development of electrocatalysts for fuel cells and H2 O2 production with maximized activity and durability.
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Affiliation(s)
- Kaiqing Wu
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Ran Chen
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Zhixin Zhou
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Xinghua Chen
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Yanqin Lv
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Jin Ma
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Yanfei Shen
- Medical School, Southeast University, Nanjing, 210009, China
| | - Songqin Liu
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Yuanjian Zhang
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
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9
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Zhao J, Lian J, Zhao Z, Wang X, Zhang J. A Review of In-Situ Techniques for Probing Active Sites and Mechanisms of Electrocatalytic Oxygen Reduction Reactions. NANO-MICRO LETTERS 2022; 15:19. [PMID: 36580130 PMCID: PMC9800687 DOI: 10.1007/s40820-022-00984-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Accepted: 11/16/2022] [Indexed: 06/03/2023]
Abstract
Electrocatalytic oxygen reduction reaction (ORR) is one of the most important reactions in electrochemical energy technologies such as fuel cells and metal-O2/air batteries, etc. However, the essential catalysts to overcome its slow reaction kinetic always undergo a complex dynamic evolution in the actual catalytic process, and the concomitant intermediates and catalytic products also occur continuous conversion and reconstruction. This makes them difficult to be accurately captured, making the identification of ORR active sites and the elucidation of ORR mechanisms difficult. Thus, it is necessary to use extensive in-situ characterization techniques to proceed the real-time monitoring of the catalyst structure and the evolution state of intermediates and products during ORR. This work reviews the major advances in the use of various in-situ techniques to characterize the catalytic processes of various catalysts. Specifically, the catalyst structure evolutions revealed directly by in-situ techniques are systematically summarized, such as phase, valence, electronic transfer, coordination, and spin states varies. In-situ revelation of intermediate adsorption/desorption behavior, and the real-time monitoring of the product nucleation, growth, and reconstruction evolution are equally emphasized in the discussion. Other interference factors, as well as in-situ signal assignment with the aid of theoretical calculations, are also covered. Finally, some major challenges and prospects of in-situ techniques for future catalysts research in the ORR process are proposed.
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Affiliation(s)
- Jinyu Zhao
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, People's Republic of China
| | - Jie Lian
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, People's Republic of China
| | - Zhenxin Zhao
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, People's Republic of China
| | - Xiaomin Wang
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, People's Republic of China.
| | - Jiujun Zhang
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, People's Republic of China.
- Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai, 200444, People's Republic of China.
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10
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Ahmed MT, Abdullah H, Kuo DH. Highly efficient photocatalytic H 2O 2 generation over dysprosium oxide-integrated g-C 3N 4 nanosheets with nitrogen deficiency. CHEMOSPHERE 2022; 307:135910. [PMID: 35940410 DOI: 10.1016/j.chemosphere.2022.135910] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 07/16/2022] [Accepted: 07/30/2022] [Indexed: 05/25/2023]
Abstract
The increasing global crisis considers energy as the fundamental cause to conduct extensive research work to find clean alternative methods with high capabilities such as H2O2 synthesis. Photocatalytic H2O2 production can tackle this growing issue by maintaining environmental remediation. In this work, dysprosium oxide (Dy-oxide)-integrated g-C3N4 has been synthesized and characterized with XRD, SEM, TEM, XPS, EPR, DRS, PL, and electrochemical analyses. Simulated solar light irradiation implemented photocatalytic H2O2 production using the as-prepared catalysts. The facile preparation technique in the Ar atmosphere raises more N deficiency in the g-C3N4 matrix. N-deficient g-C3N4 nanosheets with an exceptionally high photocatalytic performance can be further enhanced by integrating well-dispersed Dysprosium oxide (Dy2O3) particles onto g-C3N4. This study reports bandgap narrowing and various surface defects on g-C3N4 with trace amounts of Dy2O3. Undoped g-C3N4 (Dy0) yielded 20.27 mM⋅g-1⋅h-1, while the optimized photocatalyst Dy15 showed high performance of H2O2 production up to 48.36 mM⋅g-1⋅h-1. It is approximately 2.4 times higher than the pristine g-C3N4. Dy15 proves the positive impact of Dy-oxide on enhancing the N-deficient g-C3N4 performance towards photocatalytic H2O2 production. This work highlights the oxygen reduction reaction (ORR) through a mixed pathway of well-known two-step one-electron and one-step two-electron processes in H2O2 generation.
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Affiliation(s)
- Mohamed Tarek Ahmed
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan
| | - Hairus Abdullah
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan; Department of Industrial Engineering, Universitas Prima Indonesia, Medan, Indonesia.
| | - Dong-Hau Kuo
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan; Graduate Institute of Energy and Sustainability Technology, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Road, Taipei 10607, Taiwan.
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11
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Xiao Y, Xu W. Single-molecule fluorescence imaging for probing nanocatalytic process. Chem 2022. [DOI: 10.1016/j.chempr.2022.09.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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12
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Kumari R, Dkhar DS, Mahapatra S, Divya, Kumar R, Chandra P. Nano-bioengineered sensing technologies for real-time monitoring of reactive oxygen species in in vitro and in vivo models. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107615] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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13
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Fu H, Zhang N, Lai F, Zhang L, Wu Z, Li H, Zhu H, Liu T. Lattice Strained B-Doped Ni Nanoparticles for Efficient Electrochemical H 2 O 2 Synthesis. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2203510. [PMID: 35983928 DOI: 10.1002/smll.202203510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 07/12/2022] [Indexed: 06/15/2023]
Abstract
Surface strains are necessary to optimize the oxygen adsorption energy during the oxygen reduction reaction (ORR) in the four-electron process, but the surface strains regulation for ORR in the two-electron process to produce hydrogen peroxide (H2 O2 ) is rarely studied. Herein, it is reported that the tensile strained B-doped Ni nanoparticles on carbon support (Ni-B@BNC) could enhance the adsorption of O2 , stabilize OO bond, and boost the electrocatalytic ORR to H2 O2 . Moreover, the Ni-B@BNC catalysts exhibit volcano-type activity for electrocatalytic ORR to H2 O2 as a function of the strain intensity, which is controlled by B content. Among them, Ni4 -B1 @BNC exhibits the highest H2 O2 selectivity of over 86%, H2 O2 yield of 128.5 mmol h-1 g-1 , and Faraday efficiency of 94.9% at 0.6 V vs reversible hydrogen electrode as well as durable stability after successive cycling, being one of the state-of-the-art electrocatalysts for two-electron ORR. The density functional theory calculations reveal that tensile strain introduced by doping B into Ni nanoparticles could decrease the state density of Ni-3d orbital and optimize the binding energy of OOH* during ORR. A new direction is provided here for the design of highly active and stable catalysts for potential H2 O2 production and beyond.
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Affiliation(s)
- Hui Fu
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, International Joint Research Laboratory for Nano Energy Composites, Jiangnan University, Wuxi, 214122, China
| | - Nan Zhang
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, International Joint Research Laboratory for Nano Energy Composites, Jiangnan University, Wuxi, 214122, China
| | - Feili Lai
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
| | - Longsheng Zhang
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, International Joint Research Laboratory for Nano Energy Composites, Jiangnan University, Wuxi, 214122, China
| | - Zhenzhong Wu
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, International Joint Research Laboratory for Nano Energy Composites, Jiangnan University, Wuxi, 214122, China
| | - Hanjun Li
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, International Joint Research Laboratory for Nano Energy Composites, Jiangnan University, Wuxi, 214122, China
| | - Haiyan Zhu
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, International Joint Research Laboratory for Nano Energy Composites, Jiangnan University, Wuxi, 214122, China
| | - Tianxi Liu
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, International Joint Research Laboratory for Nano Energy Composites, Jiangnan University, Wuxi, 214122, China
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Fan M, Xu J, Wang Y, Yuan Q, Zhao Y, Wang Z, Jiang J. CO
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Laser‐Induced Graphene with an Appropriate Oxygen Species as an Efficient Electrocatalyst for Hydrogen Peroxide Synthesis. Chemistry 2022; 28:e202201996. [DOI: 10.1002/chem.202201996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Mengmeng Fan
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and Materials College of Chemical Engineering Nanjing Forestry University 159 Longpan Road 210037 Nanjing China
- Key Lab of Biomass Energy and Material of Jiangsu Province Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Institute of Chemical Industry of Forest Products Chinese Academy of Forestry 16 Suojin Wucun Road 210042 Nanjing China
| | - Jing Xu
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and Materials College of Chemical Engineering Nanjing Forestry University 159 Longpan Road 210037 Nanjing China
| | - Yan Wang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and Materials College of Chemical Engineering Nanjing Forestry University 159 Longpan Road 210037 Nanjing China
| | - Qixin Yuan
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and Materials College of Chemical Engineering Nanjing Forestry University 159 Longpan Road 210037 Nanjing China
| | - Yuying Zhao
- Key Lab of Biomass Energy and Material of Jiangsu Province Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Institute of Chemical Industry of Forest Products Chinese Academy of Forestry 16 Suojin Wucun Road 210042 Nanjing China
| | - Zeming Wang
- Institute of Nanochemistry and Nanobiology School of Environmental and Chemical Engineering Shanghai University 99 Shangda Road 200444 Shanghai China
| | - Jianchun Jiang
- Key Lab of Biomass Energy and Material of Jiangsu Province Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Institute of Chemical Industry of Forest Products Chinese Academy of Forestry 16 Suojin Wucun Road 210042 Nanjing China
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15
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Local photothermal and photoelectric effect synergistically boost hollow CeO2/CoS2 heterostructure electrocatalytic oxygen evolution reaction. J Colloid Interface Sci 2022; 628:663-672. [DOI: 10.1016/j.jcis.2022.07.125] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 07/05/2022] [Accepted: 07/19/2022] [Indexed: 11/18/2022]
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16
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Revealing the concentration of hydrogen peroxide in fuel cell catalyst layers by an in-operando approach. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(21)63993-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Lemineur JF, Wang H, Wang W, Kanoufi F. Emerging Optical Microscopy Techniques for Electrochemistry. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2022; 15:57-82. [PMID: 35216529 DOI: 10.1146/annurev-anchem-061020-015943] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
An optical microscope is probably the most intuitive, simple, and commonly used instrument to observe objects and discuss behaviors through images. Although the idea of imaging electrochemical processes operando by optical microscopy was initiated 40 years ago, it was not until significant progress was made in the last two decades in advanced optical microscopy or plasmonics that it could become a mainstream electroanalytical strategy. This review illustrates the potential of different optical microscopies to visualize and quantify local electrochemical processes with unprecedented temporal and spatial resolution (below the diffraction limit), up to the single object level with subnanoparticle or single-molecule sensitivity. Developed through optically and electrochemically active model systems, optical microscopy is now shifting to materials and configurations focused on real-world electrochemical applications.
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Affiliation(s)
| | - Hui Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China;
| | - Wei Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China;
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18
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Chen MM, Xu CH, Zhao W, Chen HY, Xu JJ. Super-Resolution Electrogenerated Chemiluminescence Microscopy for Single-Nanocatalyst Imaging. J Am Chem Soc 2021; 143:18511-18518. [PMID: 34699210 DOI: 10.1021/jacs.1c07827] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Electrogenerated chemiluminescence microscopy (ECLM) provides a real-time imaging approach to visualize the surface-dependent catalytic activity of nanocatalysts, which helps to rationalize the design of catalysts. In this study, we first propose super-resolution ECLM that could measure the facet- and site-specific activities of a single nanoparticle with nanometer resolution. The stochastic nature of the ECL emission makes the generation of photons obey Poisson statistics, which fits the requirement of super-resolution radial fluctuation (SRRF). By processing an SRRF algorithm, the spatial resolution of ECL images achieved ca. 100 nm, providing more abundant details on electrocatalytic reactivities at the subparticle level. Beyond conventional wide-field ECL imaging, super-resolution ECLM provided the spatial distribution of catalytic activities at a Au nanorod and nanoplate with scales of a few hundred nanometers. It helped uncover the facet- and defect-dependent surface activity, as well as the dynamic fluctuation of reactivity patterns on single nanoparticles. The super-resolution ECLM provides high spatiotemporal resolution, which shows great potential in the field of catalysis, biological imaging, and single-entity analysis.
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Affiliation(s)
- Ming-Ming Chen
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, People's Republic of China
| | - Cong-Hui Xu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, People's Republic of China
| | - Wei Zhao
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, People's Republic of China.,Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People's Republic of China
| | - Hong-Yuan Chen
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, People's Republic of China
| | - Jing-Juan Xu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, People's Republic of China
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19
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Gao J, Su H, Wang W. A microwell array-based approach for studying single nanoparticle catalysis with high turnover frequency. J Chem Phys 2021; 155:071101. [PMID: 34418929 DOI: 10.1063/5.0058402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Measuring the catalytical activities of single catalysts in the case of high turnover frequency (TOF, realistic conditions) is highly desirable to accurately evaluate the functional heterogeneities among individuals and to understand the catalytic mechanism. Herein, we report a microwell array-based method to in operando measure the photocatalytic kinetics of single CdS nanoparticles (NPs) with high TOF. This was realized by sealing individual CdS NPs into separated micrometer-sized polydimethylsiloxane wells, thus eliminating the diffusion of products among individuals in the case of high concentration of reactants. This method allowed us to monitor the activities of single catalysts with an average TOF up to 2.1 × 105 s-1. Interestingly, two types of catalytical behaviors were revealed during single CdS photocatalysis: a rapid decline in activity for most CdS NPs and an initial increase in activity followed by a decrease for a minor population of individuals. The developed method will facilitate the investigation of catalytic activities of single particles under realistic conditions and hold great potential in the fields of photo/electro-catalysts, enzymes, functional bacteria, and so on.
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Affiliation(s)
- Jia Gao
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Hua Su
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Wei Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
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20
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Tong F, Liang X, Wang Z, Liu Y, Wang P, Cheng H, Dai Y, Zheng Z, Huang B. Probing the Mechanism of Plasmon-Enhanced Ammonia Borane Methanolysis on a CuAg Alloy at a Single-Particle Level. ACS Catal 2021. [DOI: 10.1021/acscatal.1c02857] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Fengxia Tong
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
| | - Xizhuang Liang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
| | - Zeyan Wang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
| | - Yuanyuan Liu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
| | - Peng Wang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
| | - Hefeng Cheng
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
| | - Ying Dai
- School of Physics, Shandong University, Jinan 250100, Shandong, China
| | - Zhaoke Zheng
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
| | - Baibiao Huang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China
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21
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Affiliation(s)
- Yi Xiao
- State Key Laboratory of Electroanalytical Chemistry and Jilin Province Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences 5625 Renmin Street, Changchun Jilin 130022 China
- University of Science and Technology of China Hefei Anhui 230026 China
| | - Weilin Xu
- State Key Laboratory of Electroanalytical Chemistry and Jilin Province Key Laboratory of Low Carbon Chemical Power, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences 5625 Renmin Street, Changchun Jilin 130022 China
- University of Science and Technology of China Hefei Anhui 230026 China
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22
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An J, Song X, Wan W, Chen Y, Si H, Duan H, Li L, Tang B. Kinetics of the Photoelectron-Transfer Process Characterized by Real-Time Single-Molecule Fluorescence Imaging on Individual Photocatalyst Particles. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00983] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jinghua An
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in University of Shandong, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, People’s Republic of China
| | - Xiaoting Song
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in University of Shandong, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, People’s Republic of China
| | - Wenbo Wan
- School of Information Science and Engineering, Shandong Normal University, Jinan 250014, People’s Republic of China
| | - Yanzheng Chen
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in University of Shandong, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, People’s Republic of China
| | - Haibin Si
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in University of Shandong, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, People’s Republic of China
| | - Huichuan Duan
- School of Information Science and Engineering, Shandong Normal University, Jinan 250014, People’s Republic of China
| | - Lu Li
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in University of Shandong, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, People’s Republic of China
| | - Bo Tang
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in University of Shandong, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, People’s Republic of China
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