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Wang Y, Dong S, Gao Y, Lee PK, Tian Y, Meng Y, Hu X, Zhao X, Li B, Zhou D, Kang F. Difluoroester solvent toward fast-rate anion-intercalation lithium metal batteries under extreme conditions. Nat Commun 2024; 15:5408. [PMID: 38926355 PMCID: PMC11208432 DOI: 10.1038/s41467-024-49795-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 06/13/2024] [Indexed: 06/28/2024] Open
Abstract
Anion-intercalation lithium metal batteries (AILMBs) are appealing due to their low cost and fast intercalation/de-intercalation kinetics of graphite cathodes. However, the safety and cycliability of existing AILMBs are constrained by the scarcity of compatible electrolytes. Herein, we showcase that a difluoroester can be applied as electrolyte solvent to realize high-performance AILMBs, which not only endows high oxidation resistance, but also efficiently tunes the solvation shell to enable highly reversible and kinetically fast cathode reaction beyond the trifluoro counterpart. The difluoroester-based electrolyte demonstrates nonflammability, high ionic conductivity, and electrochemical stability, along with excellent electrode compatibility. The Li| |graphite AILMBs reach a high durability of 10000 cycles with only a 0.00128% capacity loss per cycle under fast-cycling of 1 A g-1, and retain ~63% of room-temperature capacity when discharging at -65 °C, meanwhile supply stable power output under deformation and overcharge conditions. The electrolyte design paves a promising path toward fast-rate, low-temperature, durable, and safe AILMBs.
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Affiliation(s)
- Yao Wang
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
| | - Shuyu Dong
- School of Energy and Environment, City University of Hong Kong, Hong Kong SAR, 999077, China
| | - Yifu Gao
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
| | - Pui-Kit Lee
- School of Energy and Environment, City University of Hong Kong, Hong Kong SAR, 999077, China
| | - Yao Tian
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
| | - Yuefeng Meng
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
| | - Xia Hu
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
| | - Xin Zhao
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
| | - Baohua Li
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
| | - Dong Zhou
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
| | - Feiyu Kang
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
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2
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Bouaamlat H, Seitsonen AP, Bussetti G, Yivlialin R, De Rosa S, Branchini P, Tortora L. Nano-protrusions in intercalated graphite: understanding the structural and electronic effects through DFT. Phys Chem Chem Phys 2024; 26:12269-12281. [PMID: 38445340 DOI: 10.1039/d3cp05706b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
Complex phenomena characterize the intercalation of ions inside stratified crystals. Their comprehension is crucial in view of exploiting the intercalation mechanism to change the transport properties of the crystal or obtaining a fine control of crystal delamination. In particular, the relationship between the concentration and nature of intercalated ions and surface structural modifications of the host stratified crystal is still under debate. Here, we discuss a theoretical effort to provide a rationale for some structural changes observed on the highly oriented pyrolytic graphite (HOPG) surface after electrochemical treatment in perchloric and sulphuric acid solutions. The formation of the so-called nano-protrusions on the basal plane of intercalated graphite was previously observed with scanning tunneling microscopy (STM). In this work, we employed both STM and density functional theory (DFT) simulations to elucidate the physical and chemical mechanisms driving the emergence of these nano-protrusions. The DFT results show that, in a bilayer graphene system, the presence of a single ion can generate a nano-protrusion with 2.49 Å height and 21.27 Å width. In the deformed area, the C-C bond length is stretched by about 2.5% more than the normal graphene bond. These values are of the same dimensional scale as those reported in previous STM experimental results.25 However, the simulated STM images obtained by increasing the amount of intercalated ions per area suggest that the presence of more than one ion is needed for the deformation of the uppermost graphite layer during the early stages of intercalation. In contrast, in a multilayer graphene system, no significant surface deformation is detected when ions are intercalated between the third and fourth layers. Charge analysis indicates an altered distribution of the charges as a consequence of the intercalation. The charge transfer from graphene layers to the intercalated ions results in a surface layer more prone to oxidation.
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Affiliation(s)
- Hussam Bouaamlat
- National Institute for Nuclear Physics - Roma Tre Division, via della Vasca Navale 84, Rome I-00146, Italy.
| | - Ari Paavo Seitsonen
- Département de Chimie, École Normale Supérieure, 24 rue Lhomond, Paris F-75005, France
| | - Gianlorenzo Bussetti
- Department of Physics, Politecnico di Milano, p.za Leonardo da Vinci 32, Milano I-20133, Italy
| | - Rossella Yivlialin
- Department of Physics, Politecnico di Milano, p.za Leonardo da Vinci 32, Milano I-20133, Italy
| | - Stefania De Rosa
- Université Grenoble Alpes, CNRS, Grenoble INP, LGP2, Grenoble 38000, France
| | - Paolo Branchini
- National Institute for Nuclear Physics - Roma Tre Division, via della Vasca Navale 84, Rome I-00146, Italy.
| | - Luca Tortora
- National Institute for Nuclear Physics - Roma Tre Division, via della Vasca Navale 84, Rome I-00146, Italy.
- Department of Science, Roma Tre University, via della Vasca Navale 84, Rome I-00146, Italy
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3
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Bussetti G, Menegazzo M, Mitko S, Castiglioni C, Tommasini M, Lucotti A, Magagnin L, Russo V, Li Bassi A, Siena M, Guadagnini A, Grillo S, Del Curto D, Duò L. A Combined Raman Spectroscopy and Atomic Force Microscopy System for In Situ and Real-Time Measures in Electrochemical Cells. MATERIALS (BASEL, SWITZERLAND) 2023; 16:2239. [PMID: 36984119 PMCID: PMC10051831 DOI: 10.3390/ma16062239] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 03/07/2023] [Accepted: 03/08/2023] [Indexed: 06/18/2023]
Abstract
An innovative and versatile set-up for in situ and real time measures in an electrochemical cell is described. An original coupling between micro-Raman spectroscopy and atomic force microscopy enables one to collect data on opaque electrodes. This system allows for the correlation of topographic images with chemical maps during the charge exchange occurring in oxidation/reduction processes. The proposed set-up plays a crucial role when reactions, both reversible and non-reversible, are studied step by step during electrochemical reactions and/or when local chemical analysis is required.
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Affiliation(s)
| | - Marco Menegazzo
- Department of Physics, Politecnico di Milano, 20133 Milan, Italy
| | - Sergei Mitko
- NT-MDT BV, Hoenderparkweg 96 b, 7335 GX Apeldoorn, The Netherlands
| | - Chiara Castiglioni
- Department of Chemistry, Materials and Chemical Engineering, Politecnico di Milano, 20133 Milan, Italy
| | - Matteo Tommasini
- Department of Chemistry, Materials and Chemical Engineering, Politecnico di Milano, 20133 Milan, Italy
| | - Andrea Lucotti
- Department of Chemistry, Materials and Chemical Engineering, Politecnico di Milano, 20133 Milan, Italy
| | - Luca Magagnin
- Department of Chemistry, Materials and Chemical Engineering, Politecnico di Milano, 20133 Milan, Italy
| | - Valeria Russo
- Department of Energy, Politecnico di Milano, 20133 Milan, Italy
| | - Andrea Li Bassi
- Department of Energy, Politecnico di Milano, 20133 Milan, Italy
| | - Martina Siena
- Department of Civil and Environmental Engineering, Politecnico di Milano, 20133 Milan, Italy
| | - Alberto Guadagnini
- Department of Civil and Environmental Engineering, Politecnico di Milano, 20133 Milan, Italy
| | - Samuele Grillo
- Department of Electronics, Information and Bioengineering, Politecnico di Milano, 20133 Milan, Italy
| | - Davide Del Curto
- Department of Architecture and Urban Studies, Politecnico di Milano, 20133 Milan, Italy
| | - Lamberto Duò
- Department of Physics, Politecnico di Milano, 20133 Milan, Italy
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4
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Bussetti G, Bernasconi R, Filoni C, Magagnin L, Bossi A, Ciccacci F, Duò L. A stable porphyrin functionalized graphite electrode used at the oxygen evolution reaction potential. ELECTROANAL 2021. [DOI: 10.1002/elan.202100563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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5
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Filoni C, Shirzadi B, Menegazzo M, Martinelli E, Di Natale C, Li Bassi A, Magagnin L, Duò L, Bussetti G. Compared EC-AFM Analysis of Laser-Induced Graphene and Graphite Electrodes in Sulfuric Acid Electrolyte. Molecules 2021; 26:7333. [PMID: 34885914 PMCID: PMC8659228 DOI: 10.3390/molecules26237333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 11/17/2021] [Accepted: 11/29/2021] [Indexed: 11/19/2022] Open
Abstract
Flexible and economic sensor devices are the focus of increasing interest for their potential and wide applications in medicine, food analysis, pollution, water quality, etc. In these areas, the possibility of using stable, reproducible, and pocket devices can simplify the acquisition of data. Among recent prototypes, sensors based on laser-induced graphene (LIGE) on Kapton represent a feasible choice. In particular, LIGE devices are also exploited as electrodes for sensing in liquids. Despite a characterization with electrochemical (EC) methods in the literature, a closer comparison with traditional graphite electrodes is still missing. In this study, we combine atomic force microscopy with an EC cell (EC-AFM) to study, in situ, electrode oxidation reactions when LIGE or other graphite samples are used as anodes inside an acid electrolyte. This investigation shows the quality and performance of the LIGE electrode with respect to other samples. Finally, an ex situ Raman spectroscopy analysis allows a detailed chemical analysis of the employed electrodes.
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Affiliation(s)
- Claudia Filoni
- Department of Physics, Politecnico di Milano, p.za Leonardo da Vinci 32, I-20133 Milan, Italy; (B.S.); (M.M.); (L.D.); (G.B.)
| | - Bahram Shirzadi
- Department of Physics, Politecnico di Milano, p.za Leonardo da Vinci 32, I-20133 Milan, Italy; (B.S.); (M.M.); (L.D.); (G.B.)
| | - Marco Menegazzo
- Department of Physics, Politecnico di Milano, p.za Leonardo da Vinci 32, I-20133 Milan, Italy; (B.S.); (M.M.); (L.D.); (G.B.)
| | - Eugenio Martinelli
- Department of Electronic Engineering, University of Rome Tor Vergata, v. del Politecnico, I-00133 Rome, Italy; (E.M.); (C.D.N.)
| | - Corrado Di Natale
- Department of Electronic Engineering, University of Rome Tor Vergata, v. del Politecnico, I-00133 Rome, Italy; (E.M.); (C.D.N.)
| | - Andrea Li Bassi
- Department of Energy, Politecnico di Milano, v. Ponzio 34/3, I-20133 Milan, Italy;
| | - Luca Magagnin
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, v. Mancinelli 7, I-20131 Milan, Italy;
| | - Lamberto Duò
- Department of Physics, Politecnico di Milano, p.za Leonardo da Vinci 32, I-20133 Milan, Italy; (B.S.); (M.M.); (L.D.); (G.B.)
| | - Gianlorenzo Bussetti
- Department of Physics, Politecnico di Milano, p.za Leonardo da Vinci 32, I-20133 Milan, Italy; (B.S.); (M.M.); (L.D.); (G.B.)
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Bussetti G, Yivlialin R, Ciccacci F, Duò L, Gibertini E, Accogli A, Denti I, Magagnin L, Micciulla F, Cataldo A, Bellucci S, Antonov A, Grigorieva I. Electrochemical scanning probe analysis used as a benchmark for carbon forms quality test. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:115002. [PMID: 33326942 DOI: 10.1088/1361-648x/abd427] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Carbon forms (graphite, pyrolytic graphite, highly oriented pyrolytic graphite (HOPG), glassy carbon, carbon foam, graphene, buckypaper, etc) are a wide class of materials largely used in technology and energy storage. The huge request of carbon compounds with reliable and tunable physical and chemical properties is tackled by contriving new production protocols and/or compound functionalizations. To achieve these goals, new samples must be tested in a trial-and-error strategy with techniques that provide information in terms of both specimen quality and properties. In this work, we prove that electrochemical scanning probe techniques allow testing the performances of carbon compounds when are used as an electrode inside an electrochemical cell. Comparing the results with a reference sample (namely, HOPG) gives an insight on defects in the specimen structure, performances, and possible applications of the new samples. In this study, we concentrate on traditional carbon forms already employed in many fields versus new recently-developed specimens, in view of possible applications to the field of energy storage.
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Affiliation(s)
| | | | | | - Lamberto Duò
- Department of Physics, Politecnico di Milano, Milano, Italy
| | - Eugenio Gibertini
- Department of Chemistry, Materials and Chemical Engineering 'Giulio Natta', Politecnico di Milano, Milano, Italy
| | - Alessandra Accogli
- Department of Chemistry, Materials and Chemical Engineering 'Giulio Natta', Politecnico di Milano, Milano, Italy
| | - Ilaria Denti
- Department of Chemistry, Materials and Chemical Engineering 'Giulio Natta', Politecnico di Milano, Milano, Italy
| | - Luca Magagnin
- Department of Chemistry, Materials and Chemical Engineering 'Giulio Natta', Politecnico di Milano, Milano, Italy
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7
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Trabattoni S, Tavazzi S, Yivlialin R, Duò L, Ciccacci F, Bussetti G. Application of UV-vis optical spectroscopy in electrochemical processes: case-study of graphite anion intercalation. APPLIED OPTICS 2020; 59:8175-8181. [PMID: 32976398 DOI: 10.1364/ao.401580] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 08/12/2020] [Indexed: 06/11/2023]
Abstract
The possibility of following electrochemical processes in situ and in real time using optical techniques is important in view of shining a light on the chemical processes at the surface. The interest grows if the optical apparatus is compact and can be employed in industrial quality-check protocols. Here, we show how graphite anion intercalation-an important chemical process to massively produce graphene flakes-can be monitored by a UV-vis spectrometer when the graphite works as an electrode immersed inside the electrochemical cell. Important information on the reversibility or quasi-reversibility of the reaction shows a clear visualization in optical color maps.
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8
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BUSSETTI G, CAMPIONE M, BOSSI A, YIVLIALIN R, DUÒ L, CICCACCI F. Anion intercalated graphite: a combined electrochemical and tribological investigation by
in situ
AFM. J Microsc 2020; 280:222-228. [DOI: 10.1111/jmi.12927] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 05/21/2020] [Accepted: 05/25/2020] [Indexed: 11/28/2022]
Affiliation(s)
- G. BUSSETTI
- Department of Physics Politecnico di Milano Milano Italy
| | - M. CAMPIONE
- Department of Earth and Environmental Sciences Università degli Studi di Milano‐Bicocca Milano Italy
| | - A. BOSSI
- Istituto di Scienze e Tecnologie Chimiche ‘G. Natta’ of the CNR (CNR‐SCITEC) Milano Italy
| | - R. YIVLIALIN
- Helmholtz‐Zentrum Berlin für Materialien und Energie Berlin Germany
| | - L. DUÒ
- Department of Physics Politecnico di Milano Milano Italy
| | - F. CICCACCI
- Department of Physics Politecnico di Milano Milano Italy
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9
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Pandey RK, Chen L, Teraji S, Nakanishi H, Soh S. Eco-Friendly, Direct Deposition of Metal Nanoparticles on Graphite for Electrochemical Energy Conversion and Storage. ACS APPLIED MATERIALS & INTERFACES 2019; 11:36525-36534. [PMID: 31518101 DOI: 10.1021/acsami.9b09273] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Simple, green, and energy-efficient methods for preparing electroactive materials used to generate and store renewable energy are important for a sustainable future. In this study, we showed that noble and certain non-noble metal nanoparticles can be deposited on graphite without the aid of any reducing agent. This method of reducing metal ions to metal nanoparticles by graphite involves only one step (i.e., immersion into a solution) and one chemical (i.e., a metal salt). Hence, the method is exceedingly simple, green, and does not require any energy input. Large amounts of metal nanoparticles are generated both on the surface and deep into the bulk of graphite (∼100 μm). Despite the simplicity of this method, the metal deposited on graphite showed good electrocatalytic performance for ethanol oxidation and oxygen evolution reactions and also functioned as electrodes for supercapacitors. This method is thus ideal for preparing electrocatalytic materials and electrochemical energy storage devices due to its simplicity and environmental sustainability. The simplicity of the method is due to the inherent reducing potential of graphite (i.e., a material that is generally perceived as inert). Results from analyses showed that functionalization of the reactive edges in the regions of defects allowed the graphite to serve as a reducing agent. Increasing the amount of defects (e.g., via chemical or simple mechanical treatments) is shown to be the fundamental principle for increasing the reactivity of graphite.
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Affiliation(s)
- Rakesh K Pandey
- Department of Chemical and Biomolecular Engineering , National University of Singapore , 4 Engineering Drive 4 , Singapore 117585 , Singapore
| | - Linfeng Chen
- Department of Chemical and Biomolecular Engineering , National University of Singapore , 4 Engineering Drive 4 , Singapore 117585 , Singapore
| | - Satoshi Teraji
- Department of Macromolecular Science and Engineering, Graduate School of Science and Technology , Kyoto Institute of Technology , Matsugasaki, Kyoto 606-8585 , Japan
| | - Hideyuki Nakanishi
- Department of Macromolecular Science and Engineering, Graduate School of Science and Technology , Kyoto Institute of Technology , Matsugasaki, Kyoto 606-8585 , Japan
| | - Siowling Soh
- Department of Chemical and Biomolecular Engineering , National University of Singapore , 4 Engineering Drive 4 , Singapore 117585 , Singapore
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10
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Pavoni E, Yivlialin R, Hardly Joseph C, Fabi G, Mencarelli D, Pierantoni L, Bussetti G, Farina M. Blisters on graphite surface: a scanning microwave microscopy investigation. RSC Adv 2019; 9:23156-23160. [PMID: 35514520 PMCID: PMC9067255 DOI: 10.1039/c9ra04667d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 07/21/2019] [Indexed: 01/01/2023] Open
Abstract
Scanning microwave microscopy (SMM) is based on the interaction between a sample and an electromagnetic evanescent field, in the microwave frequency range. SMM is usually coupled with a scanning probe microscopy (SPM) technique such as in our case, a scanning tunneling microscope (STM). In this way, the STM tip is used to control the distance between the probe and the sample while acting as an antenna for the microwave field. Thanks to the peculiarity of our home-made setup, the SMM is a suitable method to study blisters formed on HOPG surface as consequence of an electrochemical treatment. Our system has a "broad-band" approach that opens the way to perform local microwave spectroscopy over a broad frequency range. Moreover, microwaves have the ability to penetrate into the sample allowing the sub-surface characterization of materials. The application of the SMM to characterize blisters formed on the HOPG surface provides information on the sub-layer structures.
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Affiliation(s)
- Eleonora Pavoni
- Department of Information Engineering, Università Politecnica delle Marche Ancona Italy
| | - Rossella Yivlialin
- Department of Physics, Politecnico di Milano p.za Leonardo da Vinci 32 I-20133 Milano Italy
| | | | - Gianluca Fabi
- Department of Information Engineering, Università Politecnica delle Marche Ancona Italy
| | - Davide Mencarelli
- Department of Information Engineering, Università Politecnica delle Marche Ancona Italy
| | - Luca Pierantoni
- Department of Information Engineering, Università Politecnica delle Marche Ancona Italy
| | - Gianlorenzo Bussetti
- Department of Physics, Politecnico di Milano p.za Leonardo da Vinci 32 I-20133 Milano Italy
| | - Marco Farina
- Department of Information Engineering, Università Politecnica delle Marche Ancona Italy
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Abstract
Graphite intercalation via chemical strategies is a common procedure to delaminate stratified crystals and obtain a suspension of graphene flakes. The intercalation mechanism at the molecular level is still under investigation in view of enhancing graphene production and reducing damage to the original pristine crystal. The latter, in particular, can undergo surface detriment due to both blister evolution and carbon dissolution. The role of the electrolyte temperature in this process has never been investigated. Here, by using an in-situ atomic force microscopy (AFM) apparatus, we explore surface morphology changes after the application of fast cyclic-voltammetries at 343 K, in view of de-coupling the crystal swelling phenomenon from the other electrochemical processes. We find that blisters do not evolve as a consequence of the increasing temperature, while the quality of the graphite surface becomes significantly worse, due to the formation of some adsorbates on possible defect sites of the electrode surface. Our results suggest that the chemical baths used in graphite delamination must be carefully monitored in temperature for avoiding undesired electrode detriment.
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Yivlialin R, Magagnin L, Duò L, Bussetti G. Blister evolution time invariance at very low electrolyte pH: H2SO4/graphite system investigated by electrochemical atomic force microscopy. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.04.204] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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13
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Yivlialin R, Bussetti G, Duò L, Yu F, Galbiati M, Camilli L. CVD Graphene/Ni Interface Evolution in Sulfuric Electrolyte. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3413-3419. [PMID: 29485887 DOI: 10.1021/acs.langmuir.8b00459] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Systems comprising single and multilayer graphene deposited on metals and immersed in acid environments have been investigated, with the aim of elucidating the mechanisms involved, for instance, in hydrogen production or metal protection from corrosion. In this work, a relevant system, namely chemical vapor deposited (CVD) multilayer graphene/Ni (MLGr/Ni), is studied when immersed in a diluted sulfuric electrolyte. The MLGr/Ni electrochemical and morphological properties are studied in situ and interpreted in light of the highly oriented pyrolytic graphite (HOPG) electrode behavior, when immersed in the same electrolyte. Following this interpretative framework, the dominant role of the Ni substrate in hydrogen production is clarified.
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Affiliation(s)
- Rossella Yivlialin
- Department of Physics , Politecnico di Milano , p.za Leonardo da Vinci 32 , I-20133 Milano , Italy
| | - Gianlorenzo Bussetti
- Department of Physics , Politecnico di Milano , p.za Leonardo da Vinci 32 , I-20133 Milano , Italy
| | - Lamberto Duò
- Department of Physics , Politecnico di Milano , p.za Leonardo da Vinci 32 , I-20133 Milano , Italy
| | - Feng Yu
- Department of Micro- and Nanotechnology , Technical University of Denmark , Ørsteds Plads , 2800 Kgs , Lyngby , Denmark
| | - Miriam Galbiati
- Department of Micro- and Nanotechnology , Technical University of Denmark , Ørsteds Plads , 2800 Kgs , Lyngby , Denmark
| | - Luca Camilli
- Department of Micro- and Nanotechnology , Technical University of Denmark , Ørsteds Plads , 2800 Kgs , Lyngby , Denmark
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14
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Contact potential and scanning Kelvin force microscopy measurements on sulphate-anion intercalated graphite. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.02.056] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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