The role of β-CoOOH crystallographic orientations in catalytic activity for the oxygen evolution reaction (OER) remains elusive. We combine correlative electron backscatter diffraction/scanning electrochemical cell microscopy with X-ray photoelectron spectroscopy, transmission microscopy, and atom probe tomography to establish structure-activity relationships various faceted formed on a Co microelectrode under OER conditions. reveal that ≈6 nm β-CoOOH(01 1‾${\bar{1}}$ 0), grown [...

Recently, a small group of metal-organic frameworks (MOFs) has been discovered featuring substantial charge transport properties and electrical conductivity, hence promising to broaden the scope potential MOF applications in fields such as batteries, fuel cells supercapacitors. In combination with light emission, electroactive MOFs are intriguing candidates for chemical sensing optoelectronic applications. Here, we incorporated anthracene-based building blocks into MOF-74 topology five...

Co3O4/CoFe2O4 decorated on nickel foam (NF/Co3O4/CoFe2O4) was synthesized from a metal–organic framework by solvothermal approach using nicotinic acid as an organic linker followed annealing at 500 °C. The electrochemical activity of NF/Co3O4/CoFe2O4 for the oxygen evolution reaction (OER) assessed in alkaline medium. Under basic conditions (pH > 10), composite electrode revealed enhanced electrocatalytic OER requiring overpotential 215 mV versus RHE to reach 10 mA cm–2 with Tafel slope 90...

Abstract An atomic‐scale understanding of how electrocatalyst surfaces reconstruct and transform during electrocatalytic reactions is essential for optimizing their activity longevity. This particularly important the oxygen evolution reaction (OER), where dynamic substantial structural compositional changes occur reaction. Herein, a multimodal method developed by combining X‐ray fine structure absorption photoemission spectroscopy, transmission electron microscopy, atom probe tomography with...

Abstract We report the synthesis of a unique cubic metal–organic framework (MOF), Fe‐HHTP‐MOF, comprising hexahydroxytriphenylene (HHTP) supertetrahedral units and Fe III ions, arranged in diamond topology. The MOF is synthesized under solvothermal conditions, yielding highly crystalline, deep black powder, with crystallites 300–500 nm size tetrahedral morphology. Nitrogen sorption analysis indicates porous material surface area exceeding 1400 m 2 g −1 . Furthermore, Fe‐HHTP‐MOF shows...

Abstract While considerable efforts have been devoted to developing functionalized covalent organic frameworks (COFs) as oxygen evolution electrocatalysts in recent years, studies related the investigation of true catalytically active species for reaction (OER) remain lacking field. In this work, a cobalt‐functionalized COF (TpBpy‐Co) is studied electrochemical OER catalyst through series measurements and post‐electrolysis characterizations. These results suggest that cobalt oxide‐based...

Abstract Optimizing electrocatalyst performance requires an atomic‐scale understanding of surface state changes and how those affect activity stability during the reaction. This is particularly important for oxygen evolution reaction (OER) since electrocatalytically active surfaces undergo substantial reconstruction transformation. Herein, a multimodal method employed that combines X‐ray photoemission spectroscopy, transmission electron microscopy, atom probe tomography, operando...

Raman spectroscopy is a widely used technique in several contexts, including chemical analysis, materials characterization, and catalysis. However, to exploit the high capacities of this technique, signal enhancement needed. For purpose, methodologies can be used, those known as surface enhanced scattering (SERS), or resonance (RR) have been used. there are some new strategies, such electrochemical oxidation (EC-SOERS), that require further understanding for optimum exploitation diverse...

Water is an integral component in electrochemistry, the generation of electric double layer, and propagation interfacial fields into solution; however, probing molecular-level structure water near functioning electrode surfaces remains challenging. Due to surface-specificity, sum-frequency-generation (SFG) spectroscopy offers opportunity investigate working electrochemical interfaces but hydrogen-bonded at this buried electrode-electrolyte interface was thought be impossible. Propagating...

Accurate normalization of electrochemical active surface area (ECSA) nanostructured catalysts and nanoparticles is utmost importance for catalyst activity determination comparability. Au x Pd y are a highly interesting example, as electrocatalysts selective oxygen reduction reaction alcohol oxidation. Most techniques used today ECSA lack accurate validation electrodes instead rely on reference values determined macroelectrodes. This includes nanoparticles, most commonly done by...

Abstract A glassy carbon electrode (GCE) was modified with a thin layer of multiwalled nanotubes (MWCNTs) and subsequently, electrochemically deposited poly‐pyrrole. The electrochemical behavior mesalazine studied on the surface by applying linear sweep voltammetry (LSV). electropolymerization process response toward were investigated in presence different aromatic anion dopants including, benzenesulfonic acid (BSA), 1,3‐benzenedisulfonic (1,3‐BDSA), 1,5‐naphthalenedisulfonic (1,5‐NDSA) new...

Films of conductive coordination network compounds are interesting as functional materials for charge storage, electrocatalysis, electrochromic switching, or conversion light. The electrical conductivity depends on not only intrinsic material properties but also grain boundaries. Copper hexacyanoferrate shows a remarkable variation in film morphologies depending the preparation route. Conductive films can be obtained continuous crystalline that have been received by combination...

Abstract Nanomaterials are frequently employed in daily life goods, including health, textile, and food industry. A comprehensive picture is lacking on the role of capping agents, added ligand molecules, case nanoparticle reactions degradation aqueous solutions, like surface waters or biofluids. Here, we aim to elucidate agent influence reactivity probing two commonly agents citrate polyvinylpyrrolidone (PVP). Their silver (AgNP) transformation studied, which particularly important due its...

A glassy carbon electrode was coated with a thin layer of multi-walled nanotubes and subsequently electro-polymerized polypyrrole. The prepared used for the voltammetric determination olanzapine (OLZ). peak current OLZ increases remarkably on surface modified electrode. This is due to large increase in microscopic area along strong adsorption film modifier characterized by scanning electron microscopy, atomic force microscopy cyclic voltammetry techniques. Experimental variables, such as...

While considerable efforts have been devoted to developing functionalized covalent organic frameworks (COFs) as oxygen evolution electrocatalysts in recent years, studies related the identification of true catalytically active species for reaction (OER) remain lacking field. In this work, we investigated a cobalt-functionalized COF (TpBpy-Co) electrochemical OER catalyst through series measurements and post-electrolysis characterizations. Our results demonstrate that Co(II) ions, coordinated...

Abstract The electrochemical oxidation of bio‐based 5‐hydroxymethylfurfural (HMF) results in 2,5‐furandicarboxylic acid (FDCA), which is a renewable and environmentally friendly alternative to terephthalic acid. Using gold electrode, we compare the aldehyde alcohol functionality HMF isolated functionalities represented by ethanol acetaldehyde. Thereby, investigate effect inert furan ring on reaction. linear sweep voltammogram (LSV) weakly adsorbing electrolyte differs only marginally from...

Abstract We report the synthesis of a unique cubic metal–organic framework (MOF), Fe‐HHTP‐MOF, comprising hexahydroxytriphenylene (HHTP) supertetrahedral units and Fe III ions, arranged in diamond topology. The MOF is synthesized under solvothermal conditions, yielding highly crystalline, deep black powder, with crystallites 300–500 nm size tetrahedral morphology. Nitrogen sorption analysis indicates porous material surface area exceeding 1400 m 2 g −1 . Furthermore, Fe‐HHTP‐MOF shows...

Local descriptor plays an important role in Content-Based Image Retrieval (CBIR) and face recognition. Almost all local patterns are based on the relationship between neighboring pixels a area. The most famous pattern is Binary Pattern (LBP), which defined intensity difference central pixel its <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$3\times 3$</tex> window. Orthogonal Difference (OLDBP) extended version of LBP introduced recently. In...

Recently, a small group of metal-organic frameworks (MOFs) has been discovered featuring substantial charge transport properties and electrical conductivity, hence promising to broaden the scope potential MOF applications in fields such as batteries, fuel cells supercapacitors. In combination with light emission, electroactive MOFs are intriguing candidates for chemical sensing optoelectronic applications. Here, we incorporated anthracene-based building blocks into MOF-74 topology five...

Abstract The role of β‐CoOOH crystallographic orientations in catalytic activity for the oxygen evolution reaction (OER) remains elusive. We combine correlative electron backscatter diffraction/scanning electrochemical cell microscopy with X‐ray photoelectron spectroscopy, transmission microscopy, and atom probe tomography to establish structure–activity relationships various faceted formed on a Co microelectrode under OER conditions. reveal that ≈6 nm β‐CoOOH(01 0), grown [ 0]‐oriented Co,...

Transition metal oxides are highly promising catalysts for alkaline water splitting thanks to their relatively high abundancy and catalytic activity. Due limited electrical conductivity they often used as nanoparticles performance is assessed based on experiments at composite electrodes. Besides the nanocatalyst of interest, these electrodes contain catalytically inactive binders conductive additives. This makes it challenging – if not impossible distinguish influences catalyst properties...