1
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Martín-Yerga D, Xu X, Valavanis D, West G, Walker M, Unwin PR. High-Throughput Combinatorial Analysis of the Spatiotemporal Dynamics of Nanoscale Lithium Metal Plating. ACS NANO 2024; 18:23032-23046. [PMID: 39136274 PMCID: PMC11363218 DOI: 10.1021/acsnano.4c05001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 07/23/2024] [Accepted: 07/25/2024] [Indexed: 08/28/2024]
Abstract
The development of Li metal batteries requires a detailed understanding of complex nucleation and growth processes during electrodeposition. In situ techniques offer a framework to study these phenomena by visualizing structural dynamics that can inform the design of uniform plating morphologies. Herein, we combine scanning electrochemical cell microscopy (SECCM) with in situ interference reflection microscopy (IRM) for a comprehensive investigation of Li nucleation and growth on lithiophilic thin-film gold electrodes. This multimicroscopy approach enables nanoscale spatiotemporal monitoring of Li plating and stripping, along with high-throughput capabilities for screening experimental conditions. We reveal the accumulation of inactive Li nanoparticles in specific electrode regions, yet these regions remain functional in subsequent plating cycles, suggesting that growth does not preferentially occur from particle tips. Optical-electrochemical correlations enabled nanoscale mapping of Coulombic Efficiency (CE), showing that regions prone to inactive Li accumulation require more cycles to achieve higher CE. We demonstrate that electrochemical nucleation time (tnuc) is a lagging indicator of nucleation and introduce an optical method to determine tnuc at earlier stages with nanoscale resolution. Plating at higher current densities yielded smaller Li nanoparticles and increased areal density, and was not affected by heterogeneous topographical features, being potentially beneficial to achieve a more uniform plating at longer time scales. These results enhance the understanding of Li plating on lithiophilic surfaces and offer promising strategies for uniform nucleation and growth. Our multimicroscopy approach has broad applicability to study nanoscale metal plating and stripping phenomena, with relevance in the battery and electroplating fields.
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Affiliation(s)
- Daniel Martín-Yerga
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
- Department
of Chemistry, Nanoscience Center, University
of Jyväskylä, Jyväskylä 40100, Finland
| | - Xiangdong Xu
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
| | | | - Geoff West
- Warwick
Manufacturing Group, University of Warwick, Coventry CV4 7AL, U.K.
| | - Marc Walker
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K.
| | - Patrick R. Unwin
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
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2
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Cabré MB, Schröder C, Pota F, de Oliveira MAC, Nolan H, Henderson L, Brazel L, Spurling D, Nicolosi V, Martinuz P, Longhi M, Amargianou F, Bärmann P, Petit T, McKelvey K, Colavita PE. Carbon Thin-Film Electrodes as High-Performing Substrates for Correlative Single Entity Electrochemistry. SMALL METHODS 2024:e2400639. [PMID: 39155797 DOI: 10.1002/smtd.202400639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Revised: 06/24/2024] [Indexed: 08/20/2024]
Abstract
Correlative methods to characterize single entities by electrochemistry and microscopy/spectroscopy are increasingly needed to elucidate structure-function relationships of nanomaterials. However, the technical constraints often differ depending on the characterization techniques to be applied in combination. One of the cornerstones of correlative single-entity electrochemistry (SEE) is the substrate, which needs to achieve a high conductivity, low roughness, and electrochemical inertness. This work shows that graphitized sputtered carbon thin films constitute excellent electrodes for SEE while enabling characterization with scanning probe, optical, electron, and X-ray microscopies. Three different correlative SEE experiments using nanoparticles, nanocubes, and 2D Ti3C2Tx MXene materials are reported to illustrate the potential of using carbon thin film substrates for SEE characterization. The advantages and unique capabilities of SEE correlative strategies are further demonstrated by showing that electrochemically oxidized Ti3C2Tx MXene display changes in chemical bonding and electrolyte ion distribution.
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Affiliation(s)
| | | | - Filippo Pota
- School of Chemistry, Trinity College Dublin, Dublin, 2, Ireland
| | | | - Hugo Nolan
- School of Chemistry, Trinity College Dublin, Dublin, 2, Ireland
| | - Lua Henderson
- School of Chemistry, Trinity College Dublin, Dublin, 2, Ireland
| | - Laurence Brazel
- School of Chemistry, Trinity College Dublin, Dublin, 2, Ireland
| | - Dahnan Spurling
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin, Dublin, 2, Ireland
| | - Valeria Nicolosi
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin, Dublin, 2, Ireland
| | - Pietro Martinuz
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, Milano, 20133, Italy
| | - Mariangela Longhi
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, Milano, 20133, Italy
| | - Faidra Amargianou
- Helmholtz-Zentrum Berlin für Materialienund Energie GmbH (HZB), Albert-Einstein-Straße15, 12489, Berlin, Germany
| | - Peer Bärmann
- Helmholtz-Zentrum Berlin für Materialienund Energie GmbH (HZB), Albert-Einstein-Straße15, 12489, Berlin, Germany
| | - Tristan Petit
- Helmholtz-Zentrum Berlin für Materialienund Energie GmbH (HZB), Albert-Einstein-Straße15, 12489, Berlin, Germany
| | - Kim McKelvey
- School of Chemistry, Trinity College Dublin, Dublin, 2, Ireland
- MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, 6012, New Zealand
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3
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Zhang L, Wahab OJ, Jallow AA, O’Dell ZJ, Pungsrisai T, Sridhar S, Vernon KL, Willets KA, Baker LA. Recent Developments in Single-Entity Electrochemistry. Anal Chem 2024; 96:8036-8055. [PMID: 38727715 PMCID: PMC11112546 DOI: 10.1021/acs.analchem.4c01406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Affiliation(s)
- L. Zhang
- Department
of Chemistry, Texas A&M University, College Station, Texas 77845, United States
| | - O. J. Wahab
- Department
of Chemistry, Texas A&M University, College Station, Texas 77845, United States
| | - A. A. Jallow
- Department
of Chemistry, Texas A&M University, College Station, Texas 77845, United States
| | - Z. J. O’Dell
- Department
of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - T. Pungsrisai
- Department
of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - S. Sridhar
- Department
of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - K. L. Vernon
- Department
of Chemistry, Texas A&M University, College Station, Texas 77845, United States
| | - K. A. Willets
- Department
of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - L. A. Baker
- Department
of Chemistry, Texas A&M University, College Station, Texas 77845, United States
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4
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Moghaddam M, Godeffroy L, Jasielec JJ, Kostopoulos N, Noël JM, Piquemal JY, Lemineur JF, Peljo P, Kanoufi F. Scanning Electrochemical Microscopy Meets Optical Microscopy: Probing the Local Paths of Charge Transfer Operando in Booster-Microparticles for Flow Batteries. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2309607. [PMID: 38757541 DOI: 10.1002/smll.202309607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 04/08/2024] [Indexed: 05/18/2024]
Abstract
Understanding the oxidation/reduction dynamics of secondary microparticles formed from agglomerated nanoscale primary particles is crucial for advancing electrochemical energy storage technologies. In this study, the behavior of individual copper hexacyanoferrate (CuHCF) microparticles is explored at both global and local scales combining scanning electrochemical microscopy (SECM), for electrochemical interrogation of a single, but global-scale microparticle, and optical microscopy monitoring to obtain a higher resolution dynamic image of the local electrochemistry within the same particle. Chronoamperometric experiments unveil a multistep oxidation/reduction process with varying dynamics. On the one hand, the global SECM analysis enables quantifying the charge transfer as well as its dynamics at the single microparticle level during the oxidation/reduction cycles by a redox mediator in solution. These conditions allow mimicking the charge storage processes in these particles when they are used as solid boosters in redox flow batteries. On the other hand, optical imaging with sub-particle resolution allows the mapping of local conversion rates and state-of-charge within individual CuHCF particles. These maps reveal that regions of different material loadings exhibit varying charge storage capacities and conversion rates. The findings highlight the significance of porous nanostructures and provide valuable insights for designing more efficient energy storage materials.
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Affiliation(s)
- Mahdi Moghaddam
- Research Group of Battery Materials and Technologies, Department of Mechanical and Materials Engineering, Faculty of Technology, University of Turku, Turun Yliopisto, 20014, Finland
| | | | - Jerzy J Jasielec
- Research Group of Battery Materials and Technologies, Department of Mechanical and Materials Engineering, Faculty of Technology, University of Turku, Turun Yliopisto, 20014, Finland
- Department of Physical Chemistry and Modelling, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Al. Mickiewicza 30, Kraków, 30-059, Poland
| | | | - Jean-Marc Noël
- Université Paris Cité, CNRS, ITODYS, Paris, F-75013, France
| | | | | | - Pekka Peljo
- Research Group of Battery Materials and Technologies, Department of Mechanical and Materials Engineering, Faculty of Technology, University of Turku, Turun Yliopisto, 20014, Finland
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5
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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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6
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Makogon A, Noël JM, Kanoufi F, Shkirskiy V. Deciphering the Interplay between Local and Global Dynamics of Anodic Metal Oxidation. Anal Chem 2024; 96:1129-1137. [PMID: 38197168 DOI: 10.1021/acs.analchem.3c04160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
The stark difference between global and local metal oxidation dynamics underscores the need for methodologies capable of performing precise sub-μm-scale and wide-field measurements. In this study, we present reflective microscopy as a tool developed to address this challenge, illustrated by the example of chronoamperometric Fe oxidation in a NaCl solution. Analysis at a local scale of 10 s of μm has revealed three distinct periods of Fe oxidation: the initial covering of the metal interface with a surface film, followed by the electrochemical conversion of the formed surface film, and finally, the in-depth oxidation of Fe. In addition, thermodynamic calculations and the quantitative analysis of changes in optical signal (light intensity), correlated with variations in refractive indexes, suggest the initial formation of maghemite, followed by its subsequent conversion to magnetite. The reactivity maps for all three periods are heterogeneous, which can be attributed to the preferential oxidation of certain crystallographic grains. Notably, at the global scale of 100 s of μm, reactivity initiates at the electrode border and progresses toward its center, demonstrating a unique pattern that is independent of the local metal structure. This finding underscores the significance of simultaneously employing sub-μm-precise, quantitative, and wide-field measurements for a comprehensive description of metal oxidation processes.
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Affiliation(s)
| | - Jean-Marc Noël
- ITODYS, CNRS, Université Paris Cité, 75013 Paris, France
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7
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Vicente RA, Raju SP, Gomes HVN, Neckel IT, Tolentino HCN, Fernández PS. Development of Electrochemical Cells and Their Application for Spatially Resolved Analysis Using a Multitechnique Approach: From Conventional Experiments to X-Ray Nanoprobe Beamlines. Anal Chem 2023; 95:16144-16152. [PMID: 37883715 DOI: 10.1021/acs.analchem.3c02695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Real (electro)catalysts are often heterogeneous, and their activity and selectivity depend on the properties of specific active sites. Therefore, unveiling the so-called structure-activity relationship is essential for a rational search for better materials and, consequently, for the development of the field of (electro-)catalysis. Thus, spatially resolved techniques are powerful tools as they allow us to characterize and/or measure the activity and selectivity of different regions of heterogeneous catalysts. To take full advantage of that, we have developed spectroelectrochemical cells to perform spatially resolved analysis using X-ray nanoprobe synchrotron beamlines and conventional pieces of equipment. Here, we describe the techniques available at the Carnaúba beamline at the Sirius-LNLS storage ring, and then we show how our cells enable obtaining X-ray (XRF, XRD, XAS, etc.) and vibrational spectroscopy (FTIR and Raman) contrast images. Through some proof-of-concept experiments, we demonstrate how using a multi-technique approach could render a complete and detailed analysis of an (electro)catalyst overall performance.
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Affiliation(s)
- Rafael Alcides Vicente
- Department of Physical-Chemistry, Universidade Estadual de Campinas (UNICAMP), R. Josué de Castro, s/n, Cidade Universitária, Campinas 13083-872, Brazil
- Center for Innovation on New Energies (CINE), R. Michel Debrun, s/n, Prédio Amarelo, Campinas 13083-084, Brazil
| | - Swathi Patchaiammal Raju
- Department of Physical-Chemistry, Universidade Estadual de Campinas (UNICAMP), R. Josué de Castro, s/n, Cidade Universitária, Campinas 13083-872, Brazil
- Center for Innovation on New Energies (CINE), R. Michel Debrun, s/n, Prédio Amarelo, Campinas 13083-084, Brazil
| | - Heloisa Vampré Nascimento Gomes
- Department of Physical-Chemistry, Universidade Estadual de Campinas (UNICAMP), R. Josué de Castro, s/n, Cidade Universitária, Campinas 13083-872, Brazil
- Center for Innovation on New Energies (CINE), R. Michel Debrun, s/n, Prédio Amarelo, Campinas 13083-084, Brazil
| | - Itamar Tomio Neckel
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), R. Giuseppe Máximo Scolfaro, 10000 - Bosque das Palmeiras, Campinas 13083-970, Brazil
| | - Hélio Cesar Nogueira Tolentino
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), R. Giuseppe Máximo Scolfaro, 10000 - Bosque das Palmeiras, Campinas 13083-970, Brazil
| | - Pablo Sebastián Fernández
- Department of Physical-Chemistry, Universidade Estadual de Campinas (UNICAMP), R. Josué de Castro, s/n, Cidade Universitária, Campinas 13083-872, Brazil
- Center for Innovation on New Energies (CINE), R. Michel Debrun, s/n, Prédio Amarelo, Campinas 13083-084, Brazil
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8
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Fan Y, Walls M, Salzemann C, Noël JM, Kanoufi F, Courty A, Lemineur JF. Metal Core-Shell Nanoparticle Supercrystals: From Photoactivation of Hydrogen Evolution to Photocorrosion. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2305402. [PMID: 37492940 DOI: 10.1002/adma.202305402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 07/19/2023] [Indexed: 07/27/2023]
Abstract
Gas nanobubbles are directly linked to many important chemical reactions. While they can be detrimental to operational devices, they also reflect the local activity at the nanoscale. Here, supercrystals made of highly monodisperse Ag@Pt core-shell nanoparticles are first grown onto a solid support and fully characterized by electron microscopies and X-ray scattering. Supercrystals are then used as a plasmonic photocatalytic platform for triggering the hydrogen evolution reaction. The catalytic activity is measured operando at the single supercrystal level by high-resolution optical microscopy, which allows gas nanobubble nucleation to be probed at the early stage with high temporal resolution and the amount of gas molecules trapped inside them to be quantified. Finally, a correlative microscopy approach and high-resolution electron energy loss spectroscopy help to decipher the mechanisms at the origin of the local degradation of the supercrystals during catalysis, namely nanoscale erosion and corrosion.
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Affiliation(s)
- Yinan Fan
- MONARIS, Sorbonne Université, CNRS, UMR 8233, 4 Place Jussieu, Paris, 75005, France
| | - Michael Walls
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, Orsay, 91405, France
| | - Caroline Salzemann
- MONARIS, Sorbonne Université, CNRS, UMR 8233, 4 Place Jussieu, Paris, 75005, France
| | - Jean-Marc Noël
- ITODYS, Université Paris Cité, CNRS, Paris, F-75013, France
| | | | - Alexa Courty
- MONARIS, Sorbonne Université, CNRS, UMR 8233, 4 Place Jussieu, Paris, 75005, France
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9
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Lai Z, Liu M, Bi P, Huang F, Jin Y. Perspectives on Corrosion Studies Using Scanning Electrochemical Cell Microscopy: Challenges and Opportunities. Anal Chem 2023; 95:15833-15850. [PMID: 37844123 DOI: 10.1021/acs.analchem.3c02423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
Scanning electrochemical cell microscopy (SECCM) allows for electrochemical imaging at the micro- or nanoscale by confining the electrochemical reaction cell in a small meniscus formed at the end of a micro- or nanopipette. This technique has gained popularity in electrochemical imaging due to its high-throughput nature. Although it shows considerable application potential in corrosion science, there are still formidable and exciting challenges to be faced, particularly relating to the high-throughput characterization and analysis of microelectrochemical big data. The objective of this perspective is to arouse attention and provide opinions on the challenges, recent progress, and future prospects of the SECCM technique to the electrochemical society, particularly from the viewpoint of corrosion scientists. Specifically, four main topics are systematically reviewed and discussed: (1) the development of SECCM; (2) the applications of SECCM for corrosion studies; (3) the challenges of SECCM in corrosion studies; and (4) the opportunities of SECCM for corrosion science.
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Affiliation(s)
- Zhaogui Lai
- National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 102206, P. R. China
| | - Min Liu
- New Materials Institute, University of Nottingham Ningbo China, Ningbo 315100, P. R. China
| | - Peng Bi
- Laboratory for Nuclear Materials, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Feifei Huang
- National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 102206, P. R. China
| | - Ying Jin
- National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 102206, P. R. China
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10
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Godeffroy L, Shkirskiy V, Noël JM, Lemineur JF, Kanoufi F. Fuelling electrocatalysis at a single nanoparticle by ion flow in a nanoconfined electrolyte layer. Faraday Discuss 2023; 246:441-465. [PMID: 37427498 DOI: 10.1039/d3fd00032j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
We explore the possibility of coupling the transport of ions and water in a nanochannel with the chemical transformation of a reactant at an individual catalytic nanoparticle (NP). Such configuration could be interesting for constructing artificial photosynthesis devices coupling the asymmetric production of ions at the catalytic NP, with the ion selectivity of the nanochannels acting as ion pumps. Herein we propose to observe how such ion pumping can be coupled to an electrochemical reaction operated at the level of an individual electrocatalytic Pt NP. This is achieved by confining a (reservoir) droplet of electrolyte to within a few micrometres away from an electrocatalytic Pt NP on an electrode. While the region of the electrode confined by the reservoir and the NP are cathodically polarised, operando optical microscopy reveals the growth of an electrolyte nanodroplet on top of the NP. This suggests that the electrocatalysis of the oxygen reduction reaction operates at the NP and that an electrolyte nanochannel is formed - acting as an ion pump - between the reservoir and the NP. We have described here the optically imaged phenomena and their relevance to the characterization of the electrolyte nanochannel linking the NPs to the electrolyte microreservoir. Additionally, we have addressed the capacity of the nanochannel to transport ions and solvent flow to the NP.
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Affiliation(s)
| | | | - Jean-Marc Noël
- Université Paris Cité, CNRS, ITODYS, F-75013 Paris, France.
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11
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Li R, Makogon A, Galochkina T, Lemineur JF, Kanoufi F, Shkirskiy V. Unsupervised Analysis of Optical Imaging Data for the Discovery of Reactivity Patterns in Metal Alloy. SMALL METHODS 2023; 7:e2300214. [PMID: 37382395 DOI: 10.1002/smtd.202300214] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 06/08/2023] [Indexed: 06/30/2023]
Abstract
Operando wide-field optical microscopy imaging yields a wealth of information about the reactivity of metal interfaces, yet the data are often unstructured and challenging to process. In this study, the power of unsupervised machine learning (ML) algorithms is harnessed to analyze chemical reactivity images obtained dynamically by reflectivity microscopy in combination with ex situ scanning electron microscopy to identify and cluster the chemical reactivity of particles in Al alloy. The ML analysis uncovers three distinct clusters of reactivity from unlabeled datasets. A detailed examination of representative reactivity patterns confirms the chemical communication of generated OH- fluxes within particles, as supported by statistical analysis of size distribution and finite element modelling (FEM). The ML procedures also reveal statistically significant patterns of reactivity under dynamic conditions, such as pH acidification. The results align well with a numerical model of chemical communication, underscoring the synergy between data-driven ML and physics-driven FEM approaches.
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Affiliation(s)
- Rui Li
- Université Paris Cité, ITODYS, CNRS, Paris, 75013, France
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12
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Ciocci P, Valavanis D, Meloni GN, Lemineur J, Unwin PR, Kanoufi F. Optical Super‐Localisation of Single Nanoparticle Nucleation and Growth in Nanodroplets. ChemElectroChem 2023. [DOI: 10.1002/celc.202201162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- Paolo Ciocci
- Université Paris Cité ITODYS, CNRS F-75013 Paris France
| | - Dimitrios Valavanis
- Department of Chemistry University of Warwick Coventry CV4 7AL United Kingdom
| | - Gabriel N. Meloni
- Department of Chemistry University of Warwick Coventry CV4 7AL United Kingdom
- Institute of Chemistry Department of Fundamental Chemistry University of São Paulo 05508-000 São Paulo, SP Brazil
| | | | - Patrick R. Unwin
- Department of Chemistry University of Warwick Coventry CV4 7AL United Kingdom
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13
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Xu X, Valavanis D, Ciocci P, Confederat S, Marcuccio F, Lemineur JF, Actis P, Kanoufi F, Unwin PR. The New Era of High-Throughput Nanoelectrochemistry. Anal Chem 2023; 95:319-356. [PMID: 36625121 PMCID: PMC9835065 DOI: 10.1021/acs.analchem.2c05105] [Citation(s) in RCA: 34] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Xiangdong Xu
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
| | | | - Paolo Ciocci
- Université
Paris Cité, ITODYS, CNRS, F-75013 Paris, France
| | - Samuel Confederat
- School
of Electronic and Electrical Engineering and Pollard Institute, University of Leeds, Leeds LS2 9JT, U.K.,Bragg
Centre for Materials Research, University
of Leeds, Leeds LS2 9JT, U.K.
| | - Fabio Marcuccio
- School
of Electronic and Electrical Engineering and Pollard Institute, University of Leeds, Leeds LS2 9JT, U.K.,Bragg
Centre for Materials Research, University
of Leeds, Leeds LS2 9JT, U.K.,Faculty
of Medicine, Imperial College London, London SW7 2AZ, United Kingdom
| | | | - Paolo Actis
- School
of Electronic and Electrical Engineering and Pollard Institute, University of Leeds, Leeds LS2 9JT, U.K.,Bragg
Centre for Materials Research, University
of Leeds, Leeds LS2 9JT, U.K.,
| | | | - Patrick R. Unwin
- Department
of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.,
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