Perovskite oxides as bifunctional oxygen electrocatalysts for oxygen evolution/reduction reactions – A mini review

Wang, Haizhen; Zhou, Meng; Choudhury, Pabitra Pal; Luo, Hongmei

doi:10.1016/j.apmt.2019.05.004

Cited by 152 publications

(93 citation statements)

References 100 publications

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“…While for the sol-gel process, it involves two steps which include transforming a liquid (sol) to gel with subsequent posttreatment to obtain solid. [36] Thus, they are more complicated than polymer-assisted solution method. While in polymerassisted method, ethylenediaminetetraacetic acid (EDTA) and polyethyleneimine (PEI) are usually used as the complexing agents, which can almost combine with any metal ions to form water-soluble metal-polymer precursors.…”

Section: Introductionmentioning

confidence: 99%

Cation Deficiency Tuning of LaCoO₃ Perovskite as Bifunctional Oxygen Electrocatalyst

et al. 2020

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Oxygen electrocatalysis, including both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), dominates the performance of various electrochemical energy conversion and storage systems. However, the practical applications of these devices are limited as a result of the sluggish kinetics of OER and ORR as well as the high cost and instability of the state-of-the-art noble metal catalyst used in these systems. In this study, cation deficiency is introduced to the A-site of perovskite LaCoO 3 synthesized via polymer-assisted approach to enhance the electrocatalytic activity of both OER and ORR, leading to the boosted bifunctionality of the resultant electrocatalysts, which might be attributed to oxygen vacancy introduction in perovskites. The bifunctionality of the A-site deficiency perovskite (ΔE = 0.948 V) is comparable or even better than the pristine LaCoO 3 (ΔE = 1.063 V) as well as the reported state-of-the-art electrocatalysts, including both perovskites and noble metal electrocatalysts. The stability test also indicates their good stability under alkaline solutions, suggesting that the as-prepared materials can be good candidates as bifunctional electrocatalysts in oxygen-based electrochemical devices, such as fuel cells and metal-air batteries. This work introduces the A-site cation deficiency strategy to improve the bifunctional electrocatalytic performance of perovskites, and highlights the facile polymer-assisted approach for perovskites synthesis.[a] Dr.

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Section: Introductionmentioning

confidence: 99%

Cation Deficiency Tuning of LaCoO₃ Perovskite as Bifunctional Oxygen Electrocatalyst

et al. 2020

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“…Moreover, due to the mild temperature conditions used via this synthesis route, agglomerated free powders can be produced. Thus, electrocatalysts with high specific area and unique favorable morphologies towards OER can be generated [3,71].…”

Section: Dopingmentioning

confidence: 99%

Oxygen-deficient perovskites for oxygen evolution reaction in alkaline media: a review

2020

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Oxygen vacancies in complex metal oxides and specifically in perovskites are demonstrated to significantly enhance their electrocatalytic activities due to facilitating a degree of control in the material’s intrinsic properties. The reported enhancement in intrinsic OER activity of oxygen-deficient perovskites surfaces has inspired their fabrication via a myriad of schemes. Oxygen vacancies in perovskites are amongst the most favorable anionic or Schottky defects to be induced due to their low formation energies. This review discusses recent efforts for inducing oxygen vacancies in a multitude of perovskites, including facile and environmentally benign synthesis strategies, characterization techniques, and detailed insight into the intrinsic mechanistic modulation of perovskite electrocatalysts. Experimental, analytical, and computational techniques dedicated to the understanding of the improvement of OER activities upon oxygen vacancy induction are summarized in this work. The identification and utilization of intrinsic activity descriptors for the modulation of configurational structure, improvement in bulk charge transport, and favorable inflection of the electronic structure are also discussed. It is our foresight that the approaches, challenges, and prospects discussed herein will aid researchers in rationally designing highly active and stable perovskites that can outperform noble metal-based OER electrocatalysts.

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“…For instance, the tuning of anti‐bonding, for example, electrons can be attained by adding oxygen (+ δ ), which may result in decrease of anti‐bonding (e g ) electrons; however, number of anti‐bonding (e g ) electrons increases with increase in oxygen vacancy (− δ ). Instead, the antibonding (e g ) electrons decrease with creation of A‐site oxygen vacancy, thereby, increasing the oxidation state of B‐site cations 71 . The addition of A‐site cations must decrease the oxidation state of B‐site cations, thus, increasing the anti‐bonding (e g ) electrons.…”

Section: Density‐functional‐theory–based Calculations For Perovskitesmentioning

confidence: 99%

“…Till now, various categories of perovskite oxides as electrocatalyst have been reviewed, but the focus restrains on OER and ORR of perovskites 57,70 and upon their synthesis techniques 56,71 . There have been very limited reports that have discussed activity of perovskites for all three water splitting reactions, given as OER/ORR and HER.…”

Section: Introductionmentioning

confidence: 99%

Role of perovskites as a bi‐functional catalyst for electrochemical water splitting: A review

et al. 2020

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The electrochemical water splitting by using renewable electricity is being considered as a sustainable, clean and considerable source of hydrogen fuel for future transportation and energy applications. The sluggish kinetics at anode and cathode, thus, require plenty of research work on the development of an efficient and stable electrocatalyst, which would provide the enhanced activity of water splitting reaction as well as stability for long-term operation. This review draws a detailed sketch of the progress in the pursuit of replacing noble metals with non-precious perovskite-based substitutes without compromising the key electrocatalyst characteristics. Herein, we critically analysed the latest research work and progress of perovskite oxides for anodic/oxygen reduction reaction/cathodic, including the mechanism behind perovskite oxide catalytic reactions, controlled composition as well as the role of various design strategies to achieve high catalytic performance. Moreover, the article also provides an insight to the associated density functional theory that can provide profound understanding of mechanism, involved behind these reactions and, the need for computational studies to exploit the active area of catalysts. It is believed that this article will assist researchers to explore key area of research in the current generation perovskites that show enhanced catalytic performance as well as to work on unforeseen challenges.

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Perovskite oxides as bifunctional oxygen electrocatalysts for oxygen evolution/reduction reactions – A mini review

Cited by 152 publications

References 100 publications

Cation Deficiency Tuning of LaCoO₃ Perovskite as Bifunctional Oxygen Electrocatalyst

Cation Deficiency Tuning of LaCoO₃ Perovskite as Bifunctional Oxygen Electrocatalyst

Oxygen-deficient perovskites for oxygen evolution reaction in alkaline media: a review

Role of perovskites as a bi‐functional catalyst for electrochemical water splitting: A review

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Perovskite oxides as bifunctional oxygen electrocatalysts for oxygen evolution/reduction reactions – A mini review

Cited by 152 publications

References 100 publications

Cation Deficiency Tuning of LaCoO3 Perovskite as Bifunctional Oxygen Electrocatalyst

Cation Deficiency Tuning of LaCoO3 Perovskite as Bifunctional Oxygen Electrocatalyst

Oxygen-deficient perovskites for oxygen evolution reaction in alkaline media: a review

Role of perovskites as a bi‐functional catalyst for electrochemical water splitting: A review

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Cation Deficiency Tuning of LaCoO₃ Perovskite as Bifunctional Oxygen Electrocatalyst

Cation Deficiency Tuning of LaCoO₃ Perovskite as Bifunctional Oxygen Electrocatalyst