Abstract A strategy to overcome the unsatisfying catalytic performance and durability of monometallic iron‐based materials for electrochemical oxygen evolution reaction (OER) is provided by heterobimetallic iron–metal systems. Monometallic Fe catalysts show limited mostly due poor conductivity stability. Here, taking advantage structurally ordered highly conducting FeSn 2 nanostructure, first time, an intermetallic iron material employed as efficient anode alkaline OER, overall...

Electrochemical water splitting remains a frontier research topic in the quest to develop artificial photosynthetic systems by using noble metal-free and sustainable catalysts. Herein, highly crystalline CuSe has been employed as active electrodes for overall (OWS) alkaline media. The pure-phase klockmannite deposited on conducting nickel foam (NF) electrophoretic deposition (EPD) displayed an overpotential of merely 297 mV reaction oxygen evolution (OER) at current density 10 mA cm-2...

One of the key catalytic reactions for life on earth, oxidation water to molecular oxygen, occurs in oxygen-evolving complex photosystem II (PSII) mediated by a manganese-containing cluster. Considerable efforts this research area embrace development efficient artificial manganese-based catalysts oxygen evolution reaction (OER). Using OER selective oxygenation organic substrates produce value-added chemicals is worthwhile objective. However, unsatisfying performance and poor stability have...

Nickel-based bimetallic oxides such as NiMoO4 and NiWO4, when deposited on the electrode substrate, show remarkable activity toward electrocatalytic oxygen evolution reaction (OER). The stability of nanostructures is nevertheless speculative, catalytically active species have been less explored. Herein, nanorods NiWO4 nanoparticles are prepared via a solvothermal route nickel foam (NF) (NiMoO4/NF NiWO4/NF). After ensuring chemical structural integrity catalysts electrodes, an OER study has...

The semiconducting behavior of mixed-valence copper sulfides arises from the pronounced covalency Cu-S bonds and exchange coupling between Cu

Abstract Crystalline γ‐FeO(OH) dominantly possessing ─ OH terminals (𝛾‐FeO(OH) c ), polycrystalline containing multiple O, OH, and Fe pc α‐Fe 2 O 3 majorly surface are used as electrocatalysts to study the effect of on electrocatalytic nitrate reduction reaction (eNO RR) selectivity stabilization intermediates. Brunauer‐Emmett‐Teller analysis electrochemically determined area suggest a high active 117.79 m g −1 (ECSA: 0.211 cm ) for 𝛾‐FeO(OH) maximizing accessibility adsorption exhibiting...

Hydrogen production via water-splitting or ammonia electrolysis using transition metal-based electrodes is one of the most cost-effective approaches. Herein, ca. 1-4% Pt atoms are stuffed into a wolframite-type NiWO4 lattice to improve electrocatalytic efficiency. The co-existence atomically dilute quantities Pt0 and PtIV in without altering structure established powder X-ray diffraction, inductively coupled plasma mass spectrometry (ICP-MS), core-level photoelectron spectroscopy, other...

Carbon dots (C-dots) prepared through heating of aminoguanidine and citric acid enable bimodal (colorimetric fluorescence) detection nitric oxide (NO) in aqueous solutions. The C-dots retained the functional units aminoguanidine, which upon reaction with NO produced surface residues responsible for color fluorescence transformations. Notably, aminoguanidine/citric were noncytotoxic, making possible real-time high sensitivity cellular environments. Using multiprong spectroscopic...

Abstract While molecular water-oxidation catalysts are remarkably rapid, oxidative and hydrolytic processes in water can convert their active transition metals to colloidal metal oxides or hydroxides that, while quite reactive, insoluble susceptible precipitation. In response, we propose using oxidatively-inert ligands harness the themselves. This approach is demonstrated by covalently attaching entirely inorganic oxo-donor (polyoxometalates) 3-nm hematite cores, giving soluble anionic...

Although metal oxide nanocrystals are often highly active, rapid aggregation (particularly in water) generally precludes detailed solution-state investigations of their catalytic reactions. This is equally true for visible-light-driven water oxidation with hematite α-Fe2 O3 nanocrystals, which bridge a conceptual divide between molecular complexes iron and solid-state photoanodes. We herein report that the aqueous solubility remarkable stability polyoxometalate (POM)-complexed cores 275...

Abstract Exponential increase in fossil fuel consumption demands an immediate alternative for a sustainable development. Furthermore, combustion releases large quantity of CO 2 every day. In the quest alternative, although hydrogen is found to be potent with zero carbon waste, bulk‐scale production via steam reforming or partial oxidation hydrocarbons produces tons and as waste. Perhaps, by means electrocatalytic water splitting remains viable less energy‐intensive approach. However,...

In the present era, electrochemical water splitting has been showcased as a reliable solution for alternative and sustainable energy development. The development of cheap, albeit active, catalyst to split at substantial overpotential with long durability is perdurable challenge. Moreover, understanding nature surface-active species under conditions remains fundamentally important. A facile hydrothermal approach herein adapted prepare covellite (hexagonal) phase CuS nanoplates. lattice,...

To unravel the reaction mechanism of electrochemical oxygen evolution (OER), analysis intrinsic activity parameters obtained via electrokinetic investigation remains effective. In this study, polycrystalline γ-FeO(OH), synthesized at room temperature, was used as a stable, albeit reactive, anode for OER, and studies were performed to pathway. The cell hydroxyl ion concentration, cation supporting electrolyte varied, influence external bias on OER recorded. Changes in temperature from 30 65...

Despite nickel foam (NF) being often used as electrode support, the commonly adapted pretreatment strategy (high acid concentration and ultrasonication) may result in unnecessary surface oxidation, which interfere with electrochemical performance of actual catalyst. Herein, acid-pretreatment NF 0.1 M HCl ultrasonication (100 W ultrasonic power, 40 kHz frequency, 30 °C bath temperature) for a limited time (<20 min) is shown to be safe avoid formation NiO nanoparticles. Although field emission...

Due to the inferior conductivity and lability dissolution during electrocatalysis, iron catalysts lack superior electrochemical performance. However, recent studies on transition-metal oxyhydroxides depict that is active site for water oxidation. Herein, a heterobimetallic ferberite iron-tungstate nanostructure has been employed as an efficient anode material not only alkaline oxygen evolution reaction (OER) involving ethanol oxidation but also non-noble metal-based overall splitting (OWS)....

Efficient hydrogen production, biomass up-conversion, and CO2-to-fuel generation are the key challenges of present decade. Electrocatalysis in aqueous electrolytes by choosing suitable transition-metal-based electrode materials remains green approach for trio sustainable developments. Given that, finding with multifunctional capability would be beneficial. Herein, nanocrystalline α-NiS, synthesized solvothermally, has been chosen as an material. As first step to construct electrolyzer, α-NiS...

Transition metal tungstates (TMTs) possess a wolframite-like lattice structure and preferably form via an electrostatic interaction between divalent transition cation (MII) oxyanion of tungsten ([WO4]2–). A unit cell TMT is primarily composed two repeating units, [MO6]oh [WO6]oh, which are held together several M−μ2–O–W bridging links. The bond character (ionic or covalent) this determines the stability influences electronic bulk materials. Recently, TMTs have been successfully employed as...

An Anderson‐type hetero‐polyoxoanion, [Al(OH)6Mo6O18]3‐ (AlMo6) is conjugated to polycrystalline TiO2 matrix (AlMo6@TiO2) through multiple [Ti‐O‐Mo] linkages, characterized by electron microscopic studies. X‐ray photoelectron spectroscopy (XPS) and paramagnetic resonance (EPR) studies reveal high surface oxygen vacancies with dominant Ti3+ species in the AlMo6@TiO2. The experimentally determined band gap of 3.11 eV, conduction‐ valence‐band potential ‐0.84 V 2.27 (vs NHE), respectively...

The electrochemical nitrite reduction to ammonia is a growing interest in chemistry as it can be potential alternative the energy‐intensive Haber‐Bosch. In this work, two copper complexes supported by pyridine‐2‐thiol (PySH), [CuI6(PyS)6](1), and [CuI(PySH)2(ClO4)]n (2) are synthesized characterized spectroscopic techniques. molecular structure of 1 2 determined single‐crystal X‐ray analysis. complex provides distorted octahedral core with six atoms, whereas shows unique 1‐dimensional...

Abstract A poly‐phosphamide (POP) with a band gap of 2.8 eV is used for the photochemical conversion CO 2 into CH 4 and chemical organo‐epoxides cyclic carbonates. The Tauc plot Mott Schottky analyses indicate conduction potential at −1.49 V (vs NHE), much more negative than multi‐electron reduction lifetime photo‐excited electron found ns. On photoirradiation 420 nm light, POP in presence triethanolamine or ascorbic acid can selectively convert (≈99%) yield 4.6 mmol g −1 . visible‐light...

Abstract In the urge of designing noble metal‐free and sustainable electrocatalysts for oxygen evolution reaction (OER), herein, a mineral Digenite Cu 9 S 5 has been prepared from molecular copper(I) precursor, [{(PyHS) 2 I (PyHS)} ](OTf) ( 1 ), utilized as an anode material in electrocatalytic OER first time. A hot injection yielded pure phase highly crystalline , which was then electrophoretically deposited (EPD) on conducting nickel foam (NF) substrate. When assessed electrode OER, /NF...

The rational synthesis of durable, earth-abundant efficient electrocatalysts for the oxygen evolution reaction (OER) from water is one most important routes storing renewable energy and minimizing fossil fuel combustion. prime hurdles effectively utilizing commercial RuO2 as are its very low stability, catalyst deactivation, high cost. In this work, we explored a Ru-integrated porous organic polymer (Ru@Bpy-POP) by facile one-pot Friedel-Crafts alkylation strategy between redox-active...