Synthesis of Birnessite Structure Layers at the Solution–Air Interface and the Formation of Microtubules from Them

Tolstoy, Valeri P.; Gulina, L. B.

doi:10.1021/la501204k

Cited by 34 publications

(10 citation statements)

References 56 publications

(69 reference statements)

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“…The gas‐phase side of the film contains iron in 3+ state of oxidation, whereas the film surface adjacent to the solution is protected from oxidation and contains mainly Fe 2+ in the form of Fe(OH) 2 and AA anions and its iron‐based complexes with FeA 3− x H x . As a result, the film obtained, similar to, has a depth‐dependent gradient of composition, namely, different average oxidation states (AOSs) of the iron atoms. As was shown in ref.…”

Section: Resultsmentioning

confidence: 92%

Formation of Fe and Fe₂O₃ Microspirals via Interfacial Synthesis

Gulina

Tolstoy

Lobinsky

et al. 2018

Part & Part Syst Charact

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A new method is reported for obtaining microspirals of iron‐based compounds by interfacial interaction. A thin film of Fe(OH)3 is obtained as a result of interaction between an aqueous solution of iron salts and gaseous ammonia. Upon drying, it is transformed into Fe(OH)3 microspirals with a diameter of up to 10 µm. These microspirals can be transformed into Fe2O3 microspirals by annealing in air. As a result of hydrogen reduction, Fe microspirals are formed. Both the annealing in air and that in hydrogen allow the retaining of the morphology. The material synthesized is characterized by electronic microscopy methods, X‐ray diffraction, diffuse reflectance Fourier transform infrared, and Mössbauer and photoelectron spectroscopies. The electrocatalytic properties of the electrode based on Fe2O3 microspirals as a catalyst of hydrogen evolution and the magnetic properties of Fe microspirals are tested. A hypothesis is proposed on the formation of microspirals by the gas–solution interface technique.

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Section: Resultsmentioning

confidence: 92%

Formation of Fe and Fe₂O₃ Microspirals via Interfacial Synthesis

Gulina

Tolstoy

Lobinsky

et al. 2018

Part & Part Syst Charact

Self Cite

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“…The XRD pattern of the cycled MnO x (after 1000 cycles), depicted in Figure 2 a, on the other hand, did not exhibit any sharp peaks indicating the phase to be mostly amorphous. The broad peak centered at 18.64° is indexed as (002) plane of the birnessite MnO 2 phase, whereas the two faint peaks located at 36.7° and 65.7° are identified as (006) and (119) planes, respectively (JCPDS Card Number: 00-018-0802) [ 35 ]. The Fourier Transform Infrared (FTIR) spectrum of the as-synthesized MnO x films between frequencies of 500–4000 cm −1 is depicted in Figure 1 b.…”

Section: Resultsmentioning

confidence: 99%

Electrostatic Spray Deposition-Based Manganese Oxide Films—From Pseudocapacitive Charge Storage Materials to Three-Dimensional Microelectrode Integrands

et al. 2017

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In this study, porous manganese oxide (MnOx) thin films were synthesized via electrostatic spray deposition (ESD) and evaluated as pseudocapacitive electrode materials in neutral aqueous media. Very interestingly, the gravimetric specific capacitance of the ESD-based electrodes underwent a marked enhancement upon electrochemical cycling, from 72 F∙g−1 to 225 F∙g−1, with a concomitant improvement in kinetics and conductivity. The change in capacitance and resistivity is attributed to a partial electrochemical phase transformation from the spinel-type hausmannite Mn3O4 to the conducting layered birnessite MnO2. Furthermore, the films were able to retain 88.4% of the maximal capacitance after 1000 cycles. Upon verifying the viability of the manganese oxide films for pseudocapacitive applications, the thin films were integrated onto carbon micro-pillars created via carbon microelectromechanical systems (C-MEMS) for examining their application as potential microelectrode candidates. In a symmetric two-electrode cell setup, the MnOx/C-MEMS microelectrodes were able to deliver specific capacitances as high as 0.055 F∙cm−2 and stack capacitances as high as 7.4 F·cm−3, with maximal stack energy and power densities of 0.51 mWh·cm−3 and 28.3 mW·cm−3, respectively. The excellent areal capacitance of the MnOx-MEs is attributed to the pseudocapacitive MnOx as well as the three-dimensional architectural framework provided by the carbon micro-pillars.

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“…S1). 59,60 Interface-grown film fragment with porous structure after calcination. The arrow head points to the air-exposed side of the film.…”

Section: Preparation Of Co3o4 Via Basic Cobalt Carbonatementioning

confidence: 99%

Virus-directed formation of electrocatalytically active nanoparticle-based Co₃O₄ tubes

et al. 2017

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Spinel-type CoO finds applications in a wide range of fields, including clean energy conversion, where nanostructured CoO may provide a cost-efficient alternative to platinum- and iridium-based catalysts for electrocatalytic water-splitting. We here describe a novel strategy in which basic cobalt carbonate - a precursor to CoO - is precipitated as sheet-like structures and microspheres covered with fine surface protrusions, via ammonium carbonate decomposition at room temperature. Importantly, these mild reaction conditions enable us to employ bio-inspired templating approaches to further control the mineral structure. Rod-like tobacco mosaic viruses (TMV) were used as biotemplates for mineral deposition, where we profit from the ability of Co(ii) ions to mediate the ordered assembly of the virus nanorods to create complex tubular superstructures of TMV/ basic cobalt carbonate. Calcination of these tubules is then achieved with retention of the gross morphology, and generates a hierarchically-structured solid comprising interconnected CoO nanoparticles. Evaluation of these CoO materials as electrocatalysts for the oxygen evolution reaction (OER) demonstrates that the activity of CoO prepared by calcination of ammonia diffusion-grown precursors in both, the absence or presence of TMV exceeds that of a commercial nanopowder.

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Synthesis of Birnessite Structure Layers at the Solution–Air Interface and the Formation of Microtubules from Them

Cited by 34 publications

References 56 publications

Formation of Fe and Fe₂O₃ Microspirals via Interfacial Synthesis

Formation of Fe and Fe₂O₃ Microspirals via Interfacial Synthesis

Electrostatic Spray Deposition-Based Manganese Oxide Films—From Pseudocapacitive Charge Storage Materials to Three-Dimensional Microelectrode Integrands

Virus-directed formation of electrocatalytically active nanoparticle-based Co₃O₄ tubes

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Synthesis of Birnessite Structure Layers at the Solution–Air Interface and the Formation of Microtubules from Them

Cited by 34 publications

References 56 publications

Formation of Fe and Fe2O3 Microspirals via Interfacial Synthesis

Formation of Fe and Fe2O3 Microspirals via Interfacial Synthesis

Electrostatic Spray Deposition-Based Manganese Oxide Films—From Pseudocapacitive Charge Storage Materials to Three-Dimensional Microelectrode Integrands

Virus-directed formation of electrocatalytically active nanoparticle-based Co3O4 tubes

Contact Info

Product

Resources

About

Formation of Fe and Fe₂O₃ Microspirals via Interfacial Synthesis

Formation of Fe and Fe₂O₃ Microspirals via Interfacial Synthesis

Virus-directed formation of electrocatalytically active nanoparticle-based Co₃O₄ tubes