A5053029306- Electrochemical Analysis and Applications
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Machine Learning in Materials Science
- Force Microscopy Techniques and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Ion-surface interactions and analysis
- Electron and X-Ray Spectroscopy Techniques
- Fuel Cells and Related Materials
- Advanced Battery Materials and Technologies
- Advanced Memory and Neural Computing
- Conducting polymers and applications
- Thermography and Photoacoustic Techniques
- Diamond and Carbon-based Materials Research
- Electronic and Structural Properties of Oxides
- Electrochemical sensors and biosensors
- Gold and Silver Nanoparticles Synthesis and Applications
- Anodic Oxide Films and Nanostructures
- Chalcogenide Semiconductor Thin Films
- Solar-Powered Water Purification Methods
- Advanced Battery Technologies Research
- Multiferroics and related materials
- Photoacoustic and Ultrasonic Imaging
- Lanthanide and Transition Metal Complexes
Helmholtz-Zentrum Berlin für Materialien und Energie
2025
Interfaces Traitements Organisation et Dynamique des Systèmes
2021-2024
Université Paris Cité
2021-2024
Centre National de la Recherche Scientifique
2017-2024
ESPCI Paris
2023
Sorbonne Paris Cité
2022
Laboratoire Interfaces et Systèmes Électrochimiques
2022
Sorbonne Université
2017-2022
Université Paris Sciences et Lettres
2017
École Normale Supérieure - PSL
2017
Abstract Energy storage provides flexibility to an energy system and is therefore key for the incorporation of renewable sources such as wind solar into grid. Aqueous Zn–MnO 2 batteries are promising candidates grid‐scale applications due their high theoretical capacity (616 mAh g –1 ) abundance components in Earth's crust. However, they suffer from low cyclability, which probably linked dramatic pH variations induced by electrochemical conversion MnO . These known trigger...
Abstract The nanostructuration of an electrochemical interface dictates its micro‐ and macroscopic behavior. It is generally highly complex often evolves under operating conditions. Electrochemistry at these nanostructurations can be imaged both operando and/or ex situ the single nanoobject or nanoparticle (NP) level by diverse optical, electron, local probe microscopy techniques. However, they only a tiny random fraction interfaces that are essence heterogeneous. Given above background,...
FeCo Prussian blue analogues of general formula AxCoy[Fe(CN)6]z are responsive, non-stoichiometric materials whose magnetic and optical properties can be reversibly switched by light irradiation. However, elucidating the critical influence inserted alkali ion, A+, on material's remains complicated due to their complex local structure. Here, investigating soluble A ⊂ [Fe4-Co4] cyanido cubes (A = K, Rb, Cs), both accurate structural electronic information could obtained. First, X-ray...
The communication within particle agglomerates in industrial alloys can have a significant impact on the macroscopic reactivity, putting high demand adaptation of wide-field methodologies to clarify this phenomenon. In work, we report application correlated optical microscopies probing operando both local pH and surface chemical transformation with identical location scanning electron microscopy quantify situ structure reactivity foreign elements Al alloy. analyses allow us (i) reveal...
Abstract Electrodeposition of earth‐abundant iron group metals such as nickel is difficult to characterize by simple electrochemical analyses since the reduction their metal salts often competes with inhibiting reactions. This makes mechanistic interpretation sometimes contradictory, preventing unambiguous predictions about nature and structure electrodeposited material. Herein, complexity Ni nanoparticles (NPs) electrodeposition on indium tin oxide (ITO) unraveled operando at a single...
The search for efficient anodic electrochromic materials is essential to the development of devices, such as smart windows. Magnetron-sputtered lithium-nickel-tungsten mixed oxides are good candidates tackle this issue; however, they display a complicated microstructure, making it difficult pinpoint origin their electro-optical properties. Herein, by exploring Li2O-NiO-WO3 phase diagram, we obtained new phase, Li2Ni2W2O9, that crystallizes in orthorhombic Pbcn space group. This material can...
The interplay between photo- and electrochemical reactions fundamentally influences charge transfer processes at solid-liquid interfaces. Nevertheless, chemical semiconductor surfaces triggered by light excitation under applied potential remain poorly explored. This work deciphers the synergistic role of on boron-doped diamond electrodes in producing either surface redox or emission solvated electrons water. termination electron affinity, band bending, extraction is identified a...
Abstract This work proposes a novel method for measuring the intrinsic activity of single metal‐based nanoparticles towards water reduction in neutral media at industrially relevant current densities. Instead using gas nanobubbles as proxy, uses optical microscopy to track local footprint reaction through precipitation metal hydroxide, which is associated pH increase during electrocatalysis. The results show electrocatalytic activities different types and bifunctionnal core‐shell...
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, behavior individual copper hexacyanoferrate (CuHCF) explored at both global and local scales combining scanning microscopy (SECM), interrogation a single, but global‐scale microparticle, optical monitoring to obtain higher resolution dynamic image electrochemistry within...
We explore the possibility of coupling transport ions and water in a nanochannel with chemical transformation reactant at an individual catalytic nanoparticle (NP). Such configuration could be interesting for constructing artificial photosynthesis devices asymmetric production NP, ion selectivity nanochannels acting as pumps. Herein we propose to observe how such pumping can coupled electrochemical reaction operated level electrocatalytic Pt NP. This is achieved by confining (reservoir)...
Abstract This work proposes a novel method for measuring the intrinsic activity of single metal‐based nanoparticles towards water reduction in neutral media at industrially relevant current densities. Instead using gas nanobubbles as proxy, uses optical microscopy to track local footprint reaction through precipitation metal hydroxide, which is associated pH increase during electrocatalysis. The results show electrocatalytic activities different types and bifunctionnal core‐shell...
Abstract Nanoimpact electrochemistry (NIE) is a straightforward analytical technique to study at high throughput the reactivity of single nanoparticles (NPs) colliding with biased ultramicroelectrode (UME). As NIE can reveal both NP size and catalytic activity, this strategy be employed establish relationships between these two descriptors. Herein, it shown that electrode material crucial for visualizing simultaneously electrocatalytic processes transformation, which NPs. UMEs made gold (Au)...
The communication within particle agglomerates in industrial alloys can have significant impact on the macroscopic reactivity, putting a high demand adaptation of wide-field methodologies to clarify this phenomenon. In work, we report application correlated optical microscopies probing operando both local pH and surface chemical transformation with identical location scanning electron microscopy quantify in-situ structure-reactivity foreign elements Al alloy. analyses allow (i) reveal...
Abstract Electrodeposition of earth‐abundant iron group metals such as nickel is difficult to characterize by simple electrochemical analyses since the reduction their metal salts often competes with inhibiting reactions. This makes mechanistic interpretation sometimes contradictory, preventing unambiguous predictions about nature and structure electrodeposited material. Herein, complexity Ni nanoparticles (NPs) electrodeposition on indium tin oxide (ITO) unraveled operando at a single...
The communication within particle agglomerates in industrial alloys can have significant impact on the macroscopic reactivity, putting a high demand adaptation of wide-field methodologies to clarify this phenomenon. In work, we report application correlated optical microscopies probing operando both local pH and surface chemical transformation with identical location scanning electron microscopy quantify in-situ structure-reactivity foreign elements Al alloy. analyses allow (i) reveal...
The communication within particle agglomerates in industrial alloys can have significant impact on the macroscopic reactivity, putting a high demand adaptation of wide-field methodologies to clarify this phenomenon. In work, we report application correlated optical microscopies probing operando both local pH and surface chemical transformation with identical location scanning electron microscopy quantify in-situ structure-reactivity foreign elements Al alloy. analyses allow (i) reveal...
Proton exchange membrane fuel cell (PEMFC) electrocatalysts are typically Pt or alloy nanoparticles (NPs) supported on high surface area carbon black powders, the latter which contain a significant sp 2 component. One of barriers to PEMFC commercialisation is lifetime catalyst-support system, should be at least 5,000 hours for automotive applications. [1] During start-up and shut-down PEMFC, cathode subjected oxidative potentials (greater than 1 V vs RHE) can lead corrosion predominantly sp2...