Lanthanum‐Based Perovskites for Catalytic Oxygen Evolution Reaction

Dias, Jeferson Almeida; Andrade, Marcos A.S.; Santos, Hugo Leandro Sousa dos; Morelli, M. R.; Mascaro, Lúcia H.

doi:10.1002/celc.202000451

Cited by 66 publications

(25 citation statements)

References 186 publications

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“…[ 70 ] Such flexibility in composition and structure endows perovskites tunable electronic structure, which has close relationship with the catalytic activity and structural stability of OER catalysts. [ 71,72 ] Perovskites are potential alternatives for OER catalysts both in acid and alkaline medium. [ 73,74,223 ] As shown in Figure 6c, Shao‐Horn's group proposed that the e g filling of surface transition metal cations had great influence on the binding of OER intermediate to the oxide surface, thus influencing the OER activity.…”

Section: A Brief Summary Of Metal Oxide‐based Oer Catalystsmentioning

confidence: 99%

Structural Variations of Metal Oxide‐Based Electrocatalysts for Oxygen Evolution Reaction

et al. 2021

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including solar, wind, hydro, and biofuel, are highly desired to reduce our reliance on fossil fuels. However, according to the data provided by International Energy Agency, the global energy demand is 120 Mtoe in 2019, most (80%) of which was derived from fossil fuels (coal, natural gas, oil), leading to a huge CO 2 emission (33Gt in 2019). [1][2][3] One of the difficulties hindering the widespread use of these renewable energy sources is their intermittent and unpredictable nature. [4,5] Electrochemical reaction, a promising strategy for converting intermittent electricity into chemical energy, can produce a wide variety of important fuels and chemical feedstock, including hydrogen, hydrocarbons and ammonia. [6][7][8] The feedstocks for these productions obtained from electrochemical reactions can be offered by abundant and universal source, such as water, carbon dioxide and nitrogen. In last decades, due to the net-zero carbon emission features, electrochemical reactions have initiated extensive investigations based on water splitting reaction, nitrogen reduction reaction (NRR) and carbon dioxide reduction reaction. [9][10][11][12] In these green technologies, electrocatalytic oxygen evolution reaction (OER), a core reaction of these process, has a direct impact on device efficiency and cost effectiveness (Figure 1). [13,14] However, OER involves multistep four-electron transferring steps associated with OH breaking and OO formations, thus suffering from sluggish kinetics and requiring a high energy loss (high potential). Therefore, efficient and stable OER electrocatalysts are required to make these renewable energy storage/conversion processes to be viable and scalable technologies. [15,16,221,222] The OER catalysts can be classified into two categories: [17,18] molecular catalysts for homogeneous system and solid catalysts for heterogeneous system. In the homogeneous catalytic system, the molecular catalysts and the electrolyte are in solution, and the OER takes place in the liquid phase. The performance of molecular OER catalysts can be explained and understood at a molecular level by many relatively simple spectroscopic physicochemical techniques. Based on the mechanistic understanding at a molecular level, their geometric and electronic properties are much easier to be fine-tuned to achieve optimum performance by careful selection of the metal ion and ligand environment. Despite all these advantages, molecular catalysts are still not appropriate to be used in practical Electrocatalytic oxygen evolution reaction (OER), an important electrode reaction in electrocatalytic and photoelectrochemical cells for a carbonfree energy cycle, has attracted considerable attention in the last few years. Metal oxides have been considered as good candidates for electrocatalytic OER because they can be easily synthesized and are relatively stable during the OER process. However, inevitable structural variations still occur to them due to the complex reaction steps and harsh working conditions of OER, thus impending the ...

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Section: A Brief Summary Of Metal Oxide‐based Oer Catalystsmentioning

confidence: 99%

Structural Variations of Metal Oxide‐Based Electrocatalysts for Oxygen Evolution Reaction

et al. 2021

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“…In addition, the surface reactions in liquid are usually difficult to be characterized directly, because of the limitation of efficient operando techniques. The recent developments of perovskites for OER or other electrochemical applications have been described in other reviews, − ,− and these reviews introduce perovskites from synthesis, reaction mechanism, and applications. Here, we highlight the importance of perovskite surface stability during OER.…”

Section: Introductionmentioning

confidence: 99%

Regulation of Perovskite Surface Stability on the Electrocatalysis of Oxygen Evolution Reaction

Zhao

Shi

et al. 2021

ACS Materials Lett.

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Electrocatalytic water splitting is considered as a promising route to use renewable energy for hydrogen production; however, its industrial application is limited by the anodic reaction, oxygen evolution reaction (OER). The key solution to unleash this constrain is to find an electrocatalyst that reduces the overpotential (η) of OER. Among the various electrocatalysts, perovskites have attracted intense attention recently for their high OER performance and low cost. To realize the commercial potential of perovskites, understanding its surface chemistry, including leaching, reconstruction, and lattice oxygen participated OER, is crucial to develop the nextgeneration perovskite catalysts,. In this Review, the perovskite surface stability is emphasized to be closely related to the chemical component of perovskite surface, which can be well controlled by surface engineering and further improves its OER performance. A new descriptor (stability level) is proposed to highlight the relationship between OER performance and surface stability of perovskite. This descriptor will provide potential strategies to optimize OER catalytic performance by tuning surface structure of perovskite.

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“…The ferrite-based perovskite used as a substrate for a pre-catalytic layer is currently a benchmark for the oxygen electrode in Solid Oxide Fuel Cells (SOFCs) and Solid Oxide Electrolysis Cells (SOECs) operating at intermediate temperature. Specific strengths are the lower cost and the lower constraints compared to the manganite-based perovskites [ 99 , 100 , 101 ]. Therefore, its use as a fuel electrode or as a promoter for an in situ fuel processor is highly desired [ 102 ].…”

Section: Key Insights On Challenges and Perspectivesmentioning

confidence: 99%

Lanthanum Ferrites-Based Exsolved Perovskites as Fuel-Flexible Anode for Solid Oxide Fuel Cells

2020

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Exsolved perovskites can be obtained from lanthanum ferrites, such as La0.6Sr0.4Fe0.8Co0.2O3, as result of Ni doping and thermal treatments. Ni can be simply added to the perovskite by an incipient wetness method. Thermal treatments that favor the exsolution process include calcination in air (e.g., 500 °C) and subsequent reduction in diluted H2 at 800 °C. These processes allow producing a two-phase material consisting of a Ruddlesden–Popper-type structure and a solid oxide solution e.g., α-Fe100-y-zCoyNizOx oxide. The formed electrocatalyst shows sufficient electronic conductivity under reducing environment at the Solid Oxide Fuel Cell (SOFC) anode. Outstanding catalytic properties are observed for the direct oxidation of dry fuels in SOFCs, including H2, methane, syngas, methanol, glycerol, and propane. This anode electrocatalyst can be combined with a full density electrolyte based on Gadolinia-doped ceria or with La0.8Sr0.2Ga0.8Mg0.2O3 (LSGM) or BaCe0.9Y0.1O3-δ (BYCO) to form a complete perovskite structure-based cell. Moreover, the exsolved perovskite can be used as a coating layer or catalytic pre-layer of a conventional Ni-YSZ anode. Beside the excellent catalytic activity, this material also shows proper durability and tolerance to sulfur poisoning. Research challenges and future directions are discussed. A new approach combining an exsolved perovskite and an NiCu alloy to further enhance the fuel flexibility of the composite catalyst is also considered. In this review, the preparation methods, physicochemical characteristics, and surface properties of exsoluted fine nanoparticles encapsulated on the metal-depleted perovskite, electrochemical properties for the direct oxidation of dry fuels, and related electrooxidation mechanisms are examined and discussed.

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Lanthanum‐Based Perovskites for Catalytic Oxygen Evolution Reaction

Cited by 66 publications

References 186 publications

Structural Variations of Metal Oxide‐Based Electrocatalysts for Oxygen Evolution Reaction

Structural Variations of Metal Oxide‐Based Electrocatalysts for Oxygen Evolution Reaction

Regulation of Perovskite Surface Stability on the Electrocatalysis of Oxygen Evolution Reaction

Lanthanum Ferrites-Based Exsolved Perovskites as Fuel-Flexible Anode for Solid Oxide Fuel Cells

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