Ce0.8Sr0.2CoxFe1‐xO3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

Njoku, Chima Benjamin; Doyle, Bryan P.; Carleschi, Emanuela; Kriek, R.J.

doi:10.1002/elan.202060370

Cited by 3 publications

(3 citation statements)

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“…The deconvoluted cobalt 2p spectrum is displayed in Figure 4b. The two peaks at 780.3 and 796.1 eV are caused by 2p 3/2 and 2p 1/2 of Co 3+ [39], while those at 781.4 and 797.5 eV corresponds to 2p 3/2 and 2p 1/2 of Co 2+ , confirming the coexistence of Co 3+ and Co 2+ in CoNi LDH‐ Ni 3 S 2 /NF [40]. Compared to CoNi LDH/NF (Figure S4), the binding energy of CoNi LDH‐Ni 3 S 2 /NF peaks shifts to higher energies, indicating that the electron density of the Co center decreases after the formation of the heterostructure.…”

Section: Resultsmentioning

confidence: 96%

Hierarchical Rhree‐dimensional CoNi LDH‐Ni₃S₂ Supported on Ni Foam as a Stable and Efficient Electrocatalytic Material for Overall Water Splitting

et al. 2022

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Herein, a novel self-supporting three-dimensional nanostructured CoNi LDH-Ni 3 S 2 catalyst was generated in a two-step process combining hydrothermal synthesis and high-temperature electrodeposition techniques. The CoNi LDH-Ni 3 S 2 /NF electrode exhibits superior electrocatalytic performance with low overpotentials of 193 and 382 mV in 1 M KOH to drive a high current density of 100 mA cm À 2 for HER and OER, respectively. Meanwhile, a small cell voltage of 1.51 V was obtained upon using CoNi LDH-Ni 3 S 2 /NF as a dual-functional catalyst. Additionally, CoNi LDH-Ni 3 S 2 /NF exhibits high stability with almost no change in HER and OER overpotentials and electrocatalytic total decomposition of water within 80,000 s.

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Section: Resultsmentioning

confidence: 96%

Hierarchical Rhree‐dimensional CoNi LDH‐Ni₃S₂ Supported on Ni Foam as a Stable and Efficient Electrocatalytic Material for Overall Water Splitting

et al. 2022

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“…Then, by plotting the double layer current versus the scan rate, one can calculate C dl by determining the slope and thus the ECSA area [49] . C dl can also be calculated using electrochemical impedance spectroscopy as reported by Njoku and co‐authors [50] . Although, it is one of the best methods to calculate the ECSA, still, the variation in the value of the specific capacitance as determined by directly using a popular value from the publications create limitations in this method.…”

Section: Protocols For Experimental Measurements and Parameters Influ...mentioning

confidence: 99%

“…[49] C dl can also be calculated using electrochemical impedance spectroscopy as reported by Njoku and coauthors. [50] Although, it is one of the best methods to calculate the ECSA, still, the variation in the value of the specific capacitance as determined by directly using a popular value from the publications create limitations in this method. It is suggested that one should be careful while using the value of the specific capacitance as it is not necessary that the determination of surface area using the electrochemical method is the real ECSA because it does not involve interactions between reaction intermediates and electrocatalytic sites.…”

Section: Electrochemical Active Surface Area (Ecsa)mentioning

confidence: 99%

Transition Metal‐based Perovskite Oxides: Emerging Electrocatalysts for Oxygen Evolution Reaction

et al. 2023

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Development of clean and sustainable renewable energy sources is imperative to deal with the future energy crises. Various technologies have been developed in this context, for example, water electrolysis, reversible fuel cell and metal-air batteries etc. However, the sluggish kinetics of oxygen evolution reaction (OER) occurring at the anode of these energy storage/conversion systems becomes a significant hurdle. Recently, researchers utilized noble metals as electrocatalysts to enhance their efficiency still the high cost and scarcity of these materials draw the attention of researchers towards the costeffective Perovskite oxide nanomaterials due to their extraordinary flexibility. In this review, the importance of perovskite oxide nanomaterials as electrocatalysts for OER is discussed, followed by related reaction mechanisms and series of activity descriptors. Fundamental understanding about the instrumentation, parameters and protocols for the experimental measurements including concerned issues are also summarized. Moreover, various activation strategies adopted in recent years to enhance the electrocatalytic performance of perovskite oxides are also underlined. The article concludes with an outlook of existing challenges and future scope of these materials as electrocatalysts. The challenges and prospects discussed herein may pave the ways to rationally design the highly active and stable perovskites to outperform noble metal-based OER electrocatalysts.

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Deep Eutectic Solvent Synthesis of Perovskite Electrocatalysts for Water Oxidation

Hong

Díez

Adeyemi

et al. 2022

ACS Appl. Mater. Interfaces

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Oxide perovskites have attracted great interest as materials for energy conversion due to their stability and structural tunability. La-based perovskites of 3d-transition metals have demonstrated excellent activities as electrocatalysts in water oxidation. Herein, we report the synthesis route to La-based perovskites using an environmentally friendly deep eutectic solvent (DES) consisting of choline chloride and malonic acid. The DES route affords phase-pure crystalline materials on a gram scale and results in perovskites with high electrocatalytic activity for oxygen evolution reaction. A convenient, fast, and scalable synthesis proceeds via assisted metathesis at a lower temperature as compared to traditional solid-state methods. Among LaCoO3, LaMn0.5Ni0.5O3, and LaMnO3 perovskites prepared via the DES route, LaCoO3 was established to be the best-performing electrocatalyst for water oxidation in alkaline medium at 0.25 mg cm–2 mass loading. LaCoO3 exhibits current densities of 10, 50, and 100 mA cm–2 at respective overpotentials of approximately 390, 430, and 470 mV, respectively, and features a Tafel slope of 55.8 mV dec–1. The high activity of LaCoO3 as compared to the other prepared perovskites is attributed to the high concentration of oxygen vacancies in the LaCoO3 lattice, as observed by high-resolution transmission electron microscopy. An intrinsically high concentration of O vacancies in the LaCoO3 synthesized via the DES route is ascribed to the reducing atmosphere attained upon thermal decomposition of the DES components. These findings will contribute to the preparation of highly active perovskites for various energy applications.

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Ce_0.8Sr_0.2Co_xFe_1‐xO_3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

Cited by 3 publications

References 97 publications

Hierarchical Rhree‐dimensional CoNi LDH‐Ni₃S₂ Supported on Ni Foam as a Stable and Efficient Electrocatalytic Material for Overall Water Splitting

Hierarchical Rhree‐dimensional CoNi LDH‐Ni₃S₂ Supported on Ni Foam as a Stable and Efficient Electrocatalytic Material for Overall Water Splitting

Transition Metal‐based Perovskite Oxides: Emerging Electrocatalysts for Oxygen Evolution Reaction

Deep Eutectic Solvent Synthesis of Perovskite Electrocatalysts for Water Oxidation

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Ce0.8Sr0.2CoxFe1‐xO3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

Cited by 3 publications

References 97 publications

Hierarchical Rhree‐dimensional CoNi LDH‐Ni3S2 Supported on Ni Foam as a Stable and Efficient Electrocatalytic Material for Overall Water Splitting

Hierarchical Rhree‐dimensional CoNi LDH‐Ni3S2 Supported on Ni Foam as a Stable and Efficient Electrocatalytic Material for Overall Water Splitting

Transition Metal‐based Perovskite Oxides: Emerging Electrocatalysts for Oxygen Evolution Reaction

Deep Eutectic Solvent Synthesis of Perovskite Electrocatalysts for Water Oxidation

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Ce_0.8Sr_0.2Co_xFe_1‐xO_3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

Hierarchical Rhree‐dimensional CoNi LDH‐Ni₃S₂ Supported on Ni Foam as a Stable and Efficient Electrocatalytic Material for Overall Water Splitting

Hierarchical Rhree‐dimensional CoNi LDH‐Ni₃S₂ Supported on Ni Foam as a Stable and Efficient Electrocatalytic Material for Overall Water Splitting