Surface dissolution and amorphization of electrocatalysts during oxygen evolution reaction: Atomistic features and viewpoints

Yun, Tae Gyu; Sim, Yelyn; Lim, Young-Hwan; Kim, Dongho; An, Ji-Sang; Lee, Hyungdoh; Du, Yingge; Chung, Sung‐Yoon

doi:10.1016/j.mattod.2022.06.023

Cited by 22 publications

(5 citation statements)

References 162 publications

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“…In addition to the various electrical and magnetic functionalities observed in perovskite oxides, achieving high oxygen-evolution electrocatalytic activity has been a significant scientific challenge in perovskite oxides over the past decade. ,− Oxygen vacancies, lattice strains, and symmetry-broken local structures strongly correlate with the variation of the electronic structure in many oxides. ,,,,− Consequently, much attention in the field of oxygen electrocatalysis has been focused on elucidating the effects of these factors on the resulting catalysis reaction to gain an in-depth understanding of the structure–property relationship. Although our study deals with a single oxide system, the utilization of local strain fields and subsequent observation of vacancy generation at a nanometer scale can provide a useful methodology to scrutinize the complex role of vacancies and strain in oxide electrocatalysts.…”

Section: Resultsmentioning

confidence: 99%

Comparing the Impacts of Strain Types on Oxygen-Vacancy Formation in a Perovskite Oxide via Nanometer-Scale Strain Fields

Yoo,

Hwang,

Jang

et al. 2024

ACS Nano

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The utilization of an in-plane lattice misfit in an oxide epitaxially grown on another oxide with a different lattice parameter is a well-known approach to induce strains in oxide materials. However, achieving a sufficiently large misfit strain in this heteroepitaxial configuration is usually challenging, unless the thickness of the grown oxide is kept well below a critical value to prevent the formation of misfit dislocations at the interface for relaxation. Instead of adhering to this conventional approach, here, we employ nanometer-scale large strain fields built around misfit dislocations to examine the effects of two distinct types of strains�tension and compression�on the generation of oxygen vacancies in heteroepitaxial LaCoO 3 films. Our atomic-level observations, coupled with local electron-beam irradiation, clarify that the in-plane compression notably suppresses the creation of oxygen vacancies, whereas the formation of vacancies is facilitated under tensile strain. Demonstrating that the defect generation can considerably vary with the type of strain, our study highlights that the experimental approach adopted in this work is applicable to other oxide systems when investigating the strain effects on vacancy formation.

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Section: Resultsmentioning

confidence: 99%

Comparing the Impacts of Strain Types on Oxygen-Vacancy Formation in a Perovskite Oxide via Nanometer-Scale Strain Fields

Yoo,

Hwang,

Jang

et al. 2024

ACS Nano

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“…10,28 Other descriptors for the OER activity are closely related to defects in the catalyst bulk, such as distortion and . 12,33…”

Section: The Quest For Mechanistic Understanding Of Dynamic Changes D...mentioning

confidence: 99%

“…Recent experimental observations have revealed that perovskite oxide electrocatalysts – including nickelates – show a range of dynamic changes rather than staying static during OER. 12–15 The complicated modifications observed for both surfaces and bulk of nickelate electrocatalysts include the exchange of lattice oxygen and oxygen species between the electrocatalyst and the electrolyte (so-called lattice oxygen mechanisms), the formation and annihilation of ionic defects, which can also be regarded as ion (de-)intercalation processes similar to the electrode materials for aqueous batteries, as well as dynamic surface reconstructions. These dynamic changes during the OER can greatly impact the electrocatalytic activity and stability of nickelate electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Deeper mechanistic insights into epitaxial nickelate electrocatalysts for the oxygen evolution reaction

et al. 2023

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“…Different from crystalline materials with ordered atomic structure, 25 amorphous materials possess unique atomic arrangement with short‐range order and broken long‐range disorder, which endows them with small volume expansion and surface stress enrichment due to local topological characteristics 26–28 . Furthermore, rich defects and vacancies in the interior of amorphous materials brought from randomly oriented bonds contribute to extra active sites and fast ion diffusion, 29 which is beneficial for realization of excellent electrochemical performance when compared with the crystalline counterparts 30 .…”

Section: Introductionmentioning

confidence: 99%

“…Different from crystalline materials with ordered atomic structure, 25 amorphous materials possess unique atomic arrangement with short-range order and broken long-range disorder, which endows them with small volume expansion and surface stress enrichment due to local topological characteristics. [26][27][28] Furthermore, rich defects and vacancies in the interior of amorphous materials brought from randomly oriented bonds contribute to extra active sites and fast ion diffusion, 29 which is beneficial for realization of excellent electrochemical performance when compared with the crystalline counterparts. 30 It still remains challenging to realize precise size and shape control of amorphous material due to their interior complicated disorder structure and unclear growth mechanism 31 ; the inherent metastable state feature also limits the development of amorphous materials on a large degree.…”

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confidence: 99%

Surface‐amorphized nickel sulfide with boosted electrochemical performance for aqueous energy storage

Wang,

Liang,

et al. 2023

Battery Energy

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The ingenious structural design of electrode materials has a great influence on boosting the integrated conductivity and improving the electrochemical behavior of energy storage equipment. In this work, a surface‐amorphized sandwich‐type Ni3S2 nanosheet is synthesized by an easy hydrothermal and solution treatment technique. Because of the in‐built defect‐rich feature of the amorphous Ni3S2 layer, the constructed crystalline/amorphous heterointerface as well as dual nanopore structure of Ni3S2 nanosheet, the electron/ion transport and interfacial charge transfer is boosted, which contribute to high ionic conductivity and low resistance of the SA‐Ni3S2 electrode. The SA‐Ni3S2 electrode shows high specific capacitance (1767.6 F g−1 at 0.5 A g−1); the SA‐Ni3S2//AC device delivers high specific capacitance (131.2 F g−1 at 0.2 A g−1) and outstanding cycle stability (75% capacitance retention after 10000 cycles). In Ni‐Zn battery measurement, the SA‐Ni3S2//Zn exhibits satisfying specific capacity (211.2 mAh g−1 at 0.5 A g−1) and cycle durability (68% capacity decay after 2000 cycles). The results imply that the rational design of surface‐amorphized heterostructure is helpful for fabrication of electrode materials with high electrochemical performance in energy storage applications.

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Surface dissolution and amorphization of electrocatalysts during oxygen evolution reaction: Atomistic features and viewpoints

Cited by 22 publications

References 162 publications

Comparing the Impacts of Strain Types on Oxygen-Vacancy Formation in a Perovskite Oxide via Nanometer-Scale Strain Fields

Comparing the Impacts of Strain Types on Oxygen-Vacancy Formation in a Perovskite Oxide via Nanometer-Scale Strain Fields

Deeper mechanistic insights into epitaxial nickelate electrocatalysts for the oxygen evolution reaction

Surface‐amorphized nickel sulfide with boosted electrochemical performance for aqueous energy storage

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