What are the Tower's method products: Metal-hydroxides or metal-glycerolates?

Gonçalves, Josué M.; Lima, Irlan S.; Phakatkar, Abhijit H.; Pereira, Rafael S.; Martins, Paulo Roberto; Araki, Koiti; Angnes, Lúcio; Shahbazian‐Yassar, Reza

doi:10.1016/j.matchar.2022.112636

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…The survey spectra of NiG, NiMnZnG, and HE are illustrated in Figure S5, and Figure S6 contains the survey spectrum and the high-resolution spectra of the NiMnG specimen. The Ni 2p spectrum for the NiG (Figure 4a) specimen shows two peaks at the Ni 2p 3/2 region that confirms the presence of Ni 2+ and Ni 3+ , where the corresponding peaks are seen at 854.50 eV and 856.30 eV, respectively [26]. The Ni 2p spectrum for the HEG compound shows similar features to the NiG previously mentioned.…”

Section: Physicochemical Characterizationsupporting

confidence: 76%

“…As shown in Figure S7, the NiG exhibited the largest shift of the anodic wave compared to NiMnG and NiMnZnG. This shift is linked to the transformation of Ni(OH) 2 to NiOOH [26]. This phenomenon may explain the superior behavior of this monometallic glycerolate since it is more difficult to oxidize NiO x H y species, as evidenced by the anodic shift of the Ni 2+/3+ oxidation peak.…”

Section: Electrochemical Characterizationmentioning

confidence: 92%

“…Moreover, the bands between 1430 and 1550 cm -1 were assigned to the O-C-O stretching vibration modes, while the one centered at 1635 cm -1 can be related to the C=C stretching mode. These bands emerge as a consequence of glycerol oxidation reactions that can occur during the solvothermal reaction [25,26].…”

Section: Physicochemical Characterizationmentioning

confidence: 99%

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Nickel Glycerolate Overcoming a High-Entropy Configuration for High-Performance Oxygen Evolution Reaction

Lima,

Pereira,

Ritter

et al. 2023

Catalysts

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In response to the requirement for alternative energy conversion and storage methods, metal-glycerolates (MG) and their analogs are considered promising classes of electrode material that can be synthesized in various designs. Recently, the concept of high-entropy configuration and multimetallic systems has gained attention in the field of electrocatalysis. In fact, the presence of five or more metals in a single-phase material can produce unique and unexpected properties. Thus, it becomes crucial to explore different metal combinations and evaluate their synergistic interaction as a result of these combinations. Therefore, in this work, a scalable solvothermal method was used to synthesize a high-entropy glycerolate (HEG) containing Ni, Zn, Mn, Mg, and Co ions (HEG) and their respective sub-systems such as NiG, NiMnG, and NiMnZnG. The SEM-EDS images showed the excellent distribution of the metal cations in the obtained microspheres. Surprisingly, our experiments demonstrated that even in reaching a single-phase HEG, the oxygen evolution reaction (OER) performance measured in 1 M KOH electrolyte did not surpass the benefit effect observed in the NiG-based carbon paste with an overpotential of 310 mV (@10 mA cm–2), against 341 mV (@10 mA cm–2) of HEG. Moreover, the NiG shows good stability toward OER even after 24 h, which is attributed to the NiOOH active phase generated during the electrochemical cycling.

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Section: Physicochemical Characterizationsupporting

confidence: 76%

Section: Electrochemical Characterizationmentioning

confidence: 92%

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Nickel Glycerolate Overcoming a High-Entropy Configuration for High-Performance Oxygen Evolution Reaction

Lima,

Pereira,

Ritter

et al. 2023

Catalysts

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Solvothermal Synthesis of Medium‐Entropy Oxide Spheres for Thermocatalytic Conversion of CO₂ to Methanol

Mielniczuk,

Knorpp,

Shukla

et al. 2024

ChemPlusChem

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New chemical compositions and structures for medium‐ and high‐entropy oxides (HEOs) currently represent a promising new avenue in materials research for a wide range of applications including catalysis, energy storage, and ceramics. To speed up further development, synthesis methods for multicationic oxides are needed for controlling features like morphology, porosity, and chemical compositions. In this work, mesoporous spinel oxide spheres with five cations are synthesized using solvothermal synthesis techniques. The targeted chemistry included Co, Al, Fe, and Cr as the first four cations, where the fifth cation was varied by increasing cation radii (Ga, In, Yb, Ho, or Ce). After calcination, all as‐synthesized precursors led to mesoporous oxide spheres with spinel oxide structures. In order to demonstrate an example of applicability for targeting different M3+ cations, the sample containing Co, Al, Fe, Cr, and In was tested in a model reaction of thermocatalytic CO2 hydrogenation and is shown to be active with a preference to methanol formation (58% selectivity, 7.8% conversion at 300 °C). The synthesis of multicationic mesoporous spheres appears to be quite flexible in terms of possible M3+ cations compositions and is a potential material to combine targeted chemistry for applications like catalysis.

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High-Entropy Coordination Compounds and Their Derivatives as Electrocatalytic Materials

Gonçalves,

Lima,

da Silva

et al. 2024

Electrocatalytic Materials

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What are the Tower's method products: Metal-hydroxides or metal-glycerolates?

Cited by 4 publications

References 37 publications

Nickel Glycerolate Overcoming a High-Entropy Configuration for High-Performance Oxygen Evolution Reaction

Nickel Glycerolate Overcoming a High-Entropy Configuration for High-Performance Oxygen Evolution Reaction

Solvothermal Synthesis of Medium‐Entropy Oxide Spheres for Thermocatalytic Conversion of CO₂ to Methanol

High-Entropy Coordination Compounds and Their Derivatives as Electrocatalytic Materials

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What are the Tower's method products: Metal-hydroxides or metal-glycerolates?

Cited by 4 publications

References 37 publications

Nickel Glycerolate Overcoming a High-Entropy Configuration for High-Performance Oxygen Evolution Reaction

Nickel Glycerolate Overcoming a High-Entropy Configuration for High-Performance Oxygen Evolution Reaction

Solvothermal Synthesis of Medium‐Entropy Oxide Spheres for Thermocatalytic Conversion of CO2 to Methanol

High-Entropy Coordination Compounds and Their Derivatives as Electrocatalytic Materials

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Solvothermal Synthesis of Medium‐Entropy Oxide Spheres for Thermocatalytic Conversion of CO₂ to Methanol