Recent Studies on Bifunctional Perovskite Electrocatalysts in Oxygen Evolution, Oxygen Reduction, and Hydrogen Evolution Reactions under Alkaline Electrolyte

Ramakrishnan, P.; Im, Hyunsik; Baek, Seong‐Ho; Sohn, Jung Inn

doi:10.1002/ijch.201900040

Cited by 14 publications

(10 citation statements)

References 105 publications

(176 reference statements)

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“…Besides the electron transfer phenomenon, the spillover effect between Pt and SCFP in the composite is attributed as another main contributing factor to the significantly enhanced ORR and OER activities for the composite. The ORR process generally constitutes dissociative and associative pathways, the rates of which are determined by their initial oxygen dissociation energies barriers on the catalysts' surface 8a. To this end, we postulate an ORR mechanism whereby in the beginning, ORR process mainly occurs on the Pt surface where O 2 molecules are cleaved to O*.…”

Section: Resultsmentioning

confidence: 99%

“…Since obtaining single material that can exhibit simultaneously high ORR and OER performance has been quite challenging, combining precious Pt with another low‐cost material that has high OER activity is considered an attractive alternative direction to achieve a high‐performance bifunctional electrocatalyst. Perovskite oxide with a composition formula of ABO 3 (A is rare or earth metal element while B is transition metal cation) represents one of the mostly attractive constituents . The potential of such Pt–perovskite composite has recently been demonstrated by Ciucci and co‐workers, who reported Pt 3 Ni/reduced La 0.9 Mn 0.9 Pt 0.075 Ni 0.025 O 3−δ (rLMPN) via the exsolution of Pt 3 Ni in situ on the rLMPN surface.…”

Section: Introductionmentioning

confidence: 99%

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High‐Performance Platinum‐Perovskite Composite Bifunctional Oxygen Electrocatalyst for Rechargeable Zn–Air Battery

Wang

Sunarso

Lü

et al. 2019

Advanced Energy Materials

105

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Constructing highly active electrocatalysts with superior stability at low cost is a must, and vital for the large‐scale application of rechargeable Zn–air batteries. Herein, a series of bifunctional composites with excellent electrochemical activity and durability based on platinum with the perovskite Sr(Co0.8Fe0.2)0.95P0.05O3−δ (SCFP) are synthesized via a facile but effective strategy. The optimal sample Pt‐SCFP/C‐12 exhibits outstanding bifunctional activity for the oxygen reduction reaction and oxygen evolution reaction with a potential difference of 0.73 V. Remarkably, the Zn–air battery based on this catalyst shows an initial discharge and charge potential of 1.25 and 2.02 V at 5 mA cm−2, accompanied by an excellent cycling stability. X‐ray photoelectron spectroscopy, X‐ray absorption near‐edge structure, and extended X‐ray absorption fine structure experiments demonstrate that the superior performance is due to the strong electronic interaction between Pt and SCFP that arises as a result of the rapid electron transfer via the PtOCo bonds as well as the higher concentration of surface oxygen vacancies. Meanwhile, the spillover effect between Pt and SCFP also can increase more active sites via lowering energy barrier and change the rate‐determining step on the catalysts surface. Undoubtedly, this work provides an efficient approach for developing low‐cost and highly active catalysts for wider application of electrochemical energy devices.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐Performance Platinum‐Perovskite Composite Bifunctional Oxygen Electrocatalyst for Rechargeable Zn–Air Battery

Wang

Sunarso

Lü

et al. 2019

Advanced Energy Materials

105

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“…However, high reaction barriers and sluggish kinetics of HER, OER, and ORR lead to high energy input and low output power. [10,11] Currently, Pt and its alloys are still the most efficient electrocatalysts for acidic HER and ORR, whereas RuO 2 and IrO 2 are highly active toward acidic OER; however, the low-earth abundance, limited supply, and high costs also impede their industrial applications. [1] Notably, noble-metal-based materials with a single component typically fail to simultaneously exhibit high activity and durability for HER, ORR, and OER, especially in acidic environments.…”

mentioning

confidence: 99%

“…In this regard, the development of trifunctional SA catalysts can not only considerably reduce the use of noble metals required in electrolysis but also achieve optimized electrochemical performance. Unfortunately, most of the reported trifunctional materials are non-SA catalysts, [3,11,25,26] and they are mainly active in alkaline environments. Currently, Yao et al and Cao et al have independently suggested that Ru SA catalysts (comprising Pt-Ru-Cu [27] ) and Ru-N 4 [28] ) single sites, respectively) exhibit acidic OER performance superior or comparable to that of the state-of-the-art RuO 2 and IrO 2 .…”

mentioning

confidence: 99%

Trifunctional Single‐Atomic Ru Sites Enable Efficient Overall Water Splitting and Oxygen Reduction in Acidic Media

Peng

Zhao

et al. 2020

Small

148

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Energy crisis and environmental pollution trigger the development of efficient and robust electrochemical energy conversion and storage technologies. [1-3] The electrocatalytic reactions, such as hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR), undoubtedly play key roles in developing renewable energy conversion devices, Development of cost-effective, active trifunctional catalysts for acidic oxygen reduction (ORR) as well as hydrogen and oxygen evolution reactions (HER and OER, respectively) is highly desirable, albeit challenging. Herein, singleatomic Ru sites anchored onto Ti 3 C 2 T x MXene nanosheets are first reported to serve as trifunctional electrocatalysts for simultaneously catalyzing acidic HER, OER, and ORR. A half-wave potential of 0.80 V for ORR and small overpotentials of 290 and 70 mV for OER and HER, respectively, at 10 mA cm −2 are achieved. Hence, a low cell voltage of 1.56 V is required for the acidic overall water splitting. The maximum power density of an H 2-O 2 fuel cell using the as-prepared catalyst can reach as high as 941 mW cm −2. Theoretical calculations reveal that isolated Ru-O 2 sites can effectively optimize the adsorption of reactants/intermediates and lower the energy barriers for the potentialdetermining steps, thereby accelerating the HER, ORR, and OER kinetics.

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“…Recently, perovskite oxides (POs) with A 1-x A' x B y B' 1-y O z structure, where A/A' is rare-earth or alkaline-earth metal and B/B 0 is transition metal, have emerged as a potential OER catalysts. The filling degree of metal 3d antibonding orbital (e g ) in POs adjusts the spin state, the M-O bond covalence, and the shift of d-band center, further affecting the OER kinetics [59]. For example, Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ POs with an optimum e g value (1.2) has become one of the excellent OER electrocatalysts superior to IrO 2 and RuO 2 .…”

Section: Transition Metal Oxidesmentioning

confidence: 99%

Highly Efficient Electrocatalytic Water Splitting

Liu¹,

Lee²,

Wong³

2020

Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications

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Electrocatalytic water splitting serves as a critical role in sustainable energy conversion, converting electricity into abundant clean fuel-hydrogen, meeting the strong energy demands at a low environmental cost. To overcome the thermodynamic uphill and sluggish kinetics of cathodic hydrogen evolution reactions (HER) and anodic oxygen evolution reactions (OER), the promising nanomaterials catalysts with required properties, like high efficiency and durability, are in urgent need. The performance of nanoscale electrocatalysts relies on their intrinsic nature and structure, both of which can be rationalized by the proper design strategies. However, precisely tuning the nanomaterial design and performance is still a huge challenge. In this chapter, we will (i) summarize the fundamentals and mechanism and of HER and OER; (ii) systematically clarify the relationship between catalytic activity and electrode materials, further proposes the design principles of catalysts; and (iii) report the recent progress of the state-of-art nanomaterials and nanocomposites applied in electrocatalytic water splitting. This chapter intends to broaden the understanding of electrocatalytic water splitting, introduce the functional nanomaterials utilized in this application, claim the future challenges to be addressed, and guide the development of electrocatalysts in water splitting and related electrochemical processes.

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Recent Studies on Bifunctional Perovskite Electrocatalysts in Oxygen Evolution, Oxygen Reduction, and Hydrogen Evolution Reactions under Alkaline Electrolyte

Cited by 14 publications

References 105 publications

High‐Performance Platinum‐Perovskite Composite Bifunctional Oxygen Electrocatalyst for Rechargeable Zn–Air Battery

High‐Performance Platinum‐Perovskite Composite Bifunctional Oxygen Electrocatalyst for Rechargeable Zn–Air Battery

Trifunctional Single‐Atomic Ru Sites Enable Efficient Overall Water Splitting and Oxygen Reduction in Acidic Media

Highly Efficient Electrocatalytic Water Splitting

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