Anodic Oxidation Enabled Cation Leaching for Promoting Surface Reconstruction in Water Oxidation

Duan, Yan; Lee, Jun Yan; Xi, Shibo; Sun, Yuanmiao; Ge, Jingjie; Ong, Samuel Jun Hoong; Chen, Yubo; Dou, Shuo; Meng, Fan-Xu; Diao, Caozheng; Fisher, Adrian C.; Wang, Xin; Scherer, Günther G.; Grimaud, Alexis; Xu, Zhichuan J.

doi:10.1002/anie.202015060

Cited by 137 publications

(119 citation statements)

References 64 publications

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“…[ 37 ] In another typical case, Duan et al found the cation leaching of Cr in CoCr 2 O 4 by activating the pristine material at high potential, which enabled the transformation of inactive spinel CoCr 2 O 4 into a highly active catalyst. [ 49 ] The depletion of Cr and consumption of lattice oxygen facilitate the formation of surface defects and oxygen vacancies, exposing Co species to reconstruct into active Co oxyhydroxides which differ from CoOOH.…”

Section: Dynamics Of Vacancy On Surfacementioning

confidence: 99%

Dynamic Surface Chemistry of Catalysts in Oxygen Evolution Reaction

Kou

Zhang

et al. 2021

Small Science

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Electrocatalytic oxygen evolution reaction (OER) is a crucial anode reaction where electrocatalysts are the key elements and their dynamic surface chemistry runs throughout the entire process. Herein, we examine the latest advances and challenges in understanding of the dynamic surface chemistry of OER electrocatalysts. There are electrochemical origin and driving force for the dynamic surface nature, where several processes can take place either concurrently or sequentially, including reconstruction (i.e., phase formation/transformation, morphological change, and compositional change), vacancy generation and filling/refilling, and the intermediate adsorption-desorption process on catalytic surface. These dynamic surface processes of OER catalysts are impacted by not only the reaction and service conditions, including the (local) pH and its gradient distribution, applied potential, types and concentration of exotic ions and external fields on top of the nature of catalysts/precatalysts, but also their interactions. Due to the local, time-dependent and instant nature, there are considerable challenges in tracing, modelling and understanding of the complete dynamic surface chemistry of catalysts in OER, by means of ex situ, in situ and operando experimental investigations. Therefore, computational studies and dynamic simulations help provide key insights in future pursuits, where there is critical need for a multiscale computational modelling approach encompassing all these aspects.

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Section: Dynamics Of Vacancy On Surfacementioning

confidence: 99%

Dynamic Surface Chemistry of Catalysts in Oxygen Evolution Reaction

Kou

Zhang

et al. 2021

Small Science

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“…[47][48][49][50][51][52] High-surface nanomaterials are preferable targets for elucidating electrocatalytic interface processes. [53][54][55][56] Therefore, we constructed a series of hierarchical nanostructures of cobalt phosphide nanoboxes (denoted as Co-P NBs) and Fe doped cobalt phosphide nanoboxes (Co@CoFe-P NBs) from tailored coordination polymer precursors via a self-templating strategy. This controllable strategy furthermore brought forward single-shell cobalt sulfide nanoboxes (Co-S NBs), hybrids of cobalt sulfides and CoFe-based Prussian blue nanoboxes (Co-S@CoFe-PB NBs), double-shell CoFe-based oxide nanoboxes (Co@CoFe-O NBs), as well as CoFe-based selenides (Co@CoFe-Se), and CoFe-based tellurides (Co@CoFe-Te).…”

Section: Introductionmentioning

confidence: 99%

Dynamics and control of active sites in hierarchically nanostructured cobalt phosphide/chalcogenide-based electrocatalysts for water splitting

Zhao

Dongfang

Triana

et al. 2022

Energy Environ. Sci.

105

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“…[18][19][20][21][22][23] These works show that the reconstruction-derived surface species, rather than the initial perovskite oxide, should be responsible for the measured activity, [21,22,24] which is further experimentally supported by a recent work of our group. [25] Nevertheless, for different starting materials, the dynamic structural and compositional responses with the variation of applied potential may be diverse, [18,21,[26][27][28][29][30] and the impact of surface changes on catalytic performance also varies. [31][32][33] Therefore, the reconstruction behaviors and the ultimate OER activity are still expected to be strongly influenced by the bulk chemistry of initial materials (precatalysts).…”

Section: Introductionmentioning

confidence: 99%

Surface Reconstruction of Perovskites for Water Oxidation: The Role of Initial Oxides’ Bulk Chemistry

Chen

Seow

et al. 2021

Small Science

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Developing highly active electrocatalysts for oxygen evolution reaction (OER) is crucial for the scalable production of renewable hydrogen fuels by water electrolysis. Perovskite oxides are extensively studied as OER catalysts as they can have high activity and also offer considerable flexibility in composition and structure. Recently, there are increasingly numerous reports regarding dynamic surface reconstruction of perovskite oxides under OER conditions, with claims that the reconstruction‐derived species are the actual catalysts responsible for the measured OER activity. To enable rational design of perovskite oxides as precatalysts to generate actual active components in situ, gaining essential understanding of their reconstruction behaviors is crucial. This perspective discusses the roles of initial bulk chemistry in the surface evolution process of perovskite oxides during OER, including the dependency of surface stability on electronic structure of the precatalyst and the possibility of occurrence of lattice oxygen evolution reaction and cation leaching on the surface of a perovskite oxide precatalyst. It is reasonably argued that tailoring the bulk properties of perovskite precatalysts, such as electronic structure, crystallographic structure, and ion stoichiometry, can influence the occurrence of surface reconstruction and the formation of actual active surface species.

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Anodic Oxidation Enabled Cation Leaching for Promoting Surface Reconstruction in Water Oxidation

Cited by 137 publications

References 64 publications

Dynamic Surface Chemistry of Catalysts in Oxygen Evolution Reaction

Dynamic Surface Chemistry of Catalysts in Oxygen Evolution Reaction

Dynamics and control of active sites in hierarchically nanostructured cobalt phosphide/chalcogenide-based electrocatalysts for water splitting

Surface Reconstruction of Perovskites for Water Oxidation: The Role of Initial Oxides’ Bulk Chemistry

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