Electrochemically-assisted deposition by local pH tuning: a versatile tool to generate ordered mesoporous silica thin films and layered double hydroxide materials

International audienceThis review presents the interest of electrochemistry for the preparation of two families of porous materials (ordered mesoporous silica and layer\ed double hydroxide), generated as thin films on solid electrode surfaces via an electrochemically assisted local pH tuning. The deposition mechanism is dependent on the target material. The driving force to get the ordered mesoporous silica thin films is the combination of electrochemical interfacial surfactant templating to the electro-assisted sol-gel deposition, leading to the growth of vertically aligned mesopore channels of surfactant-templated silica. The mechanism involved in the generation of layered double hydroxide (LDH) thin films is the electrochemically induced precipitation of the material by the electrogenerated hydroxide anions, which can be also applied to the formation of LDH-based composites. After a presentation of the materials that can be synthesized by the electrochemical manipulation of localized pH at electrode/solution interfaces, their characterization and applications are also briefly discussed

Electrodes modified with synthetic anionic clays

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LDHs as Electrode Materials for Electrochemical Detection and Energy Storage : Supercapacitor, Battery an (Bio)-Sensor.

International audienceFrom an exhaustive overview based on applicative academic literature and patent domain, the relevance of Layered Double Hydroxide (LDHs) as electrode materials for electrochemical detection of organic molecules having environmental or health impact and energy storage is evaluated. Specifically the focus is driven on their application as supercapacitor, alkaline or lithium battery and (bio)-sensor. Inherent to the high versatility of their chemical composition, charge density, anion exchange capability, LDH-based materials are extensively studied and their performances for such applications are reported. Indeed the analytical characteristics (sensitivity and detection limit) of LDH-based electrodes are scrutinized, and their specific capacity or capacitance as electrode battery or supercapacitor materials, are detailed

Hybrid and biohybrid layered double hydroxides for electrochemical analysis

International audienceLayered double hydroxides (LDH) are lamellar materials that have been extensively used as electrode modifiers. Nanostructured organic-inorganic materials can be designed by intercalation of organic or metallic complexes within the interlayer space of these materials or by the formation of composite materials based on biopolymers (alginate or chitosan) or biomolecules, such as enzymes. These hybrid or biohybrid materials have interesting properties applicable in electroanalytical devices. From an exhaustive review of the literature, the relevance of these hybrid and biohybrid LDH materials as electrode materials for electrochemical detection of species with an environmental or health impact is evaluated. The analytical characteristics (sensitivity and detection limit) of LDH-based amperometric sensors or biosensors are scrutinized

Recent advances in layered double hydroxides‐based electrochemical sensors: Insight in transition metal contribution

Among the nanomaterials reported in the literature, layered double hydroxides (LDHs) are considered promising for the electrochemical sensor technology. Transition metal-based layered double hydroxides (TM-LDHs) show excellent electrocatalytic properties that facilitate redox reactions with analytes, e.g. H2O2, glucose or glyphosate. Elaboration of porous nano-structures with TM-LDHs nanosheets on the electrode surface allows a rapid diffusion of the analytes and a good accessibility of the TM active sites. An association of TM-LDHs with conductive materials, e.g. graphene or metal nanoparticles (M-NPs), improves the electronic conductivity in the LDH-based composites and also the electrocatalytic activity. With a selection of recent publications, the present mini-review aims to discuss about the specific electrocatalytic role played by TMs (Ni, Co, Cu, Mn and Fe) present in the LDH layers on the performance (sensitivity and detection limit) of these TM-LDHs-based sensors

Electroreducible amphiphilic compounds

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Adsorption de l'adenosine a l'electrode de mercure—II. Etudes thermodynamique et cinetique de la formation de la phase condensee aux densites de charges fortement negatives

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Advances in Layered double Hydroxide-based Materials for CO2 Electroreduction: A Comprehensive Review of recent Research Progress

International audiencePlease provide Text for Abstract. Over the past decade, layered double hydroxides (LDH), known as ionic lamellarcompounds, have been described as promising materials for CO2 adsorption and its photocatalytic conversion. These LDHapplications have been already reviewed in previous papers. Interestingly, over the past three years, LDH have been alsoused for the design of modified electrodes applied to CO2 electroreduction (CO2ER). This review presents, for the firsttime, an overview of these recent developments in the synthesis of electrocatalysts based on LDH and their performance inCO2ER. In this field of applications, LDH act either i) as electrocatalysts, ii) as supports for other electrocatalysts, iii) asprecursors for the generation of metal nanoparticles or metal oxide electrocatalysts through chemical or electrochemicalconversions. The composition of the as-prepared electrocatalysts and electrolysis conditions modify the reduction productsformed. ZnAl-based LDH appears to be a promising catalyst for CO formation, and CuAl-LDH for formate. A chemical orelectrochemical activation of copper-based LDH to obtain Cu+ and/or Cu0 active species appears to be a very promisingmethod for generating valuable products, such as acetate, methanol or ethylene. This review will be useful for newprospects on LDH-based electrocatalysts applied on CO2ER

Environmental electrochemical processes: Remediation, energy harvesting and monitoring

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Electrogeneration of a Hydrophilic Cross-Linked Polypyrrole Film for Enzyme Electrode Fabrication. Application to the Amperometric Detection of Glucose

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