Porous hollow nanorod structured chromium-substituted inverse spinel compound: An efficient oxygen evolution reaction catalyst

Ramakrishnan, P.; Lee, Keon Beom; Geonju, Choi; Park, Il‐Kyu; Sohn, Jung Inn

doi:10.1016/j.jiec.2021.06.015

Cited by 9 publications

(3 citation statements)

References 45 publications

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“…The selected area electron diffraction (SAED) patterns (Figures 2c and S4c 2p 1/2 , respectively (Figure S6). As shown in Figure 3a, the Zn LMM Auger peak is centered at the kinetic energy of ∼989 eV rather than 992 eV of the pure Zn metal, 42 43 Figure 3c shows the Fe 2p core-level XPS spectra for the ZnCr 1.2 Fe 0.8 O 4 and ZnFe 2 O 4 samples. The positions of the Fe 2p 3/2 peak at 711.0−713.5 eV and the presence of shake-up satellite peaks provide abundant information to attribute to the characteristic of Fe 3+ .…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…The obtained Cr 2p spectra are resolved into two major splittings of Cr 2p 3/2 and Cr 2p 1/2 and two satellite peaks, respectively. Taking into account the multiplet splitting, both the Cr 2p signals should further be divided into two peaks of Cr 2p 3/2 at 578.8 and 576.5 eV and Cr 2p 1/2 at 588.3 and 586.2 eV, being assigned to Cr 3+ ion oxidation state Figure c shows the Fe 2p core-level XPS spectra for the ZnCr 1.2 Fe 0.8 O 4 and ZnFe 2 O 4 samples.…”

Section: Resultsmentioning

confidence: 99%

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Breaking the N₂ Solubility Limit to Achieve Efficient Electrosynthesis of NH₃ over Cr-Based Spinel Oxides

Cui

Lei

et al. 2022

ACS Sustainable Chem. Eng.

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Electrochemical synthesis of NH 3 from H 2 O and N 2 , as a sustainable alternative to the Haber−Bosch process, has attracted extensive attention. However, the achievement of effective NH 3 electrosynthesis remains challenging since N 2 features remarkable thermodynamic stability and ultralow solubility in aqueous electrolytes. Here, we prepare new-type Cr-based spinel oxides using coprecipitation and hydrothermal methods. The ternary spinel ZnCr 2−x Fe x O 4 phases are formed by substituting Fe 3+ ions for Cr 3+ ions at octahedral sites of ZnCr 2 O 4 . The introduction of Fe results in lattice expansion, lattice distortion, an increase in oxygen vacancies, and a remarkable change in the electronic structure, which further affect nitrogen chemisorption and activation properties. The asfabricated ZnCr 1.2 Fe 0.8 O 4 spinel has bifunctional active sites of Cr 3+ and Fe 3+ and exhibits large capacity and moderate strength of N 2 chemisorption. To break the N 2 solubility limit in the aqueous electrolytes for electrosynthesis of NH 3 , a novel two-step process of gas-phase N 2 adsorption and electroreduction is successfully developed. The catalyst has excellent catalytic performances with an ammonia formation rate of 29.26 μg h −1 cm −2 , the highest Faradaic efficiency of 18.41%, and long-term stability for 20 h. This study provides a new strategy for developing a highly efficient electrocatalyst for the electrosynthesis of NH 3 .

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Section: ■ Results and Discussionmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Breaking the N₂ Solubility Limit to Achieve Efficient Electrosynthesis of NH₃ over Cr-Based Spinel Oxides

Cui

Lei

et al. 2022

ACS Sustainable Chem. Eng.

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“…[12]. In this category, nickel ferrite (NiFe 2 O 4 ) is a soft ferrite with, inverse spinel [13,14]. Various synthesis methods have been designed for research and commercial purposes in order to improve the performance chart, achieve new results, and fulfil the application pyramid of these ferrites.…”

Section: Introductionmentioning

confidence: 99%

Structural, Electrical and Magnetic Properties of Zn Doped NiFe2O4 Added with 0.8wt%V2O5 Synthesized via Ceramic Method

2022

Bulg.J.Phys.

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Using the traditional ceramic process, zinc doped 'Nickel ferrite' with V2O5 was produced, yielding Ni0.7Zn0.3Fe2O4 + 0.8wt%V2O5. Various technical methodologies were used to characterize structural, electrical, magnetic, and dielectric properties. X-ray diffraction was used to identify the crystalline phases after the addition of V2O5 as an impurity. Major reflections obtained in XRD were indexed as ( 220), ( 310), ( 311), ( 222), ( 400), ( 422), (511), and (440) planes that confirmed the formation of ferrite crystalline phases in particular with single-phase, cubic shape, spinel structure. The avg. lattice parameter (a) of the prepared sample was found to be 8.380±0.005 Å. The X-ray density was recorded to be 5.303 g/cm 3 . The crystallite size (t) was calculated by using the Debye-Scherrer method taking the (311) plane of maximum intensity; it was reported to be 2.684 µm. The development of the ferrite phase was supported by different absorption bands v1 (542 cm −1 ) and v2 (410.84 cm −1 ) corresponding to the tetrahedral and octahedral group complexes Fe 3+ -O 2− respectively. The logarithmic plot of DC resistivity has shown the semiconducting behaviour of the prepared samples. The magnetic parameters have shown some changes at higher levels after the addition of V2O5 in Ni0.7Zn0.3Fe2O4.

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Nanoflowers of Ternary Cobalt–Copper–Manganese Oxide as an Efficient Electrocatalyst for Oxygen Evolution Reaction

Raghav,

Rosaiah,

Al‐Asbahi

et al. 2024

Energy Tech

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Oxygen evolution reaction (OER) is an integral step in the water‐splitting process. Hence, to promote OER, efficient catalysts are required to lower the energy barriers at the electrode/electrolyte interface. Low‐cost and highly active catalysts are in great demand. Herein, a ternary metal oxide, CoCuMnOx, synthesized by a facile hydrothermal method is reported, which possesses excellent catalytic ability for OER in alkaline electrolytes. The nanoscale morphology of the catalyst with flower‐like nanostructures is instrumental in increasing the electrochemical surface area of the electrode. The presence of multivalent ions and the incorporation of copper greatly enhance the electrochemical properties of the catalysts. The catalysts typically demonstrate an overpotential value of 220 mV for achieving 10 mA cm−2 current density and a Tafel slope of 73 mV dec−1. The catalysts demonstrate good stability with minimal degradation in OER activity even after 20 h of chronopotentiometry test. For practical applications, this low‐cost material holds great potential.

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Porous hollow nanorod structured chromium-substituted inverse spinel compound: An efficient oxygen evolution reaction catalyst

Cited by 9 publications

References 45 publications

Breaking the N₂ Solubility Limit to Achieve Efficient Electrosynthesis of NH₃ over Cr-Based Spinel Oxides

Breaking the N₂ Solubility Limit to Achieve Efficient Electrosynthesis of NH₃ over Cr-Based Spinel Oxides

Structural, Electrical and Magnetic Properties of Zn Doped NiFe2O4 Added with 0.8wt%V2O5 Synthesized via Ceramic Method

Nanoflowers of Ternary Cobalt–Copper–Manganese Oxide as an Efficient Electrocatalyst for Oxygen Evolution Reaction

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Porous hollow nanorod structured chromium-substituted inverse spinel compound: An efficient oxygen evolution reaction catalyst

Cited by 9 publications

References 45 publications

Breaking the N2 Solubility Limit to Achieve Efficient Electrosynthesis of NH3 over Cr-Based Spinel Oxides

Breaking the N2 Solubility Limit to Achieve Efficient Electrosynthesis of NH3 over Cr-Based Spinel Oxides

Structural, Electrical and Magnetic Properties of Zn Doped NiFe2O4 Added with 0.8wt%V2O5 Synthesized via Ceramic Method

Nanoflowers of Ternary Cobalt–Copper–Manganese Oxide as an Efficient Electrocatalyst for Oxygen Evolution Reaction

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Breaking the N₂ Solubility Limit to Achieve Efficient Electrosynthesis of NH₃ over Cr-Based Spinel Oxides

Breaking the N₂ Solubility Limit to Achieve Efficient Electrosynthesis of NH₃ over Cr-Based Spinel Oxides