Surface-reaction induced structural oscillations in the subsurface

Sun, Xianhu; Zhu, Wenhui; Wu, Dazhuan; Li, Chaoran; Wang, Yunlong; Zhu, Yaguang; Chen, Xiaobo; Boscoboinik, J. Anibal; Sharma, Renu; Zhou, Guangwen

doi:10.1038/s41467-019-14167-1

Cited by 32 publications

(22 citation statements)

References 74 publications

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“…powerful method for the investigation of gas-solid interactions, delivering valuable insights about adsorbent-induced surface structuring, [18][19][20][21] particle shape reconstruction, [22][23][24] and phase changes. [25,26] The recent development of nanoreactors with silicon-based micro-electromechanical systems (MEMS) technology has further enabled in situ TEM studies of catalysts at pressures up to ≈1 bar and temperatures up to 1000 °C.…”

Section: Introductionmentioning

confidence: 99%

Phase Coexistence and Structural Dynamics of Redox Metal Catalysts Revealed by Operando TEM

et al. 2021

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Metal catalysts play an important role in industrial redox reactions. Although extensively studied, the state of these catalysts under operating conditions is largely unknown, and assignments of active sites remain speculative. Herein, an operando transmission electron microscopy study is presented, which interrelates the structural dynamics of redox metal catalysts to their activity. Using hydrogen oxidation on copper as an elementary redox reaction, it is revealed how the interaction between metal and the surrounding gas phase induces complex structural transformations and drives the system from a thermodynamic equilibrium toward a state controlled by the chemical dynamics. Direct imaging combined with the simultaneous detection of catalytic activity provides unparalleled structure–activity insights that identify distinct mechanisms for water formation and reveal the means by which the system self‐adjusts to changes of the gas‐phase chemical potential. Density functional theory calculations show that surface phase transitions are driven by chemical dynamics even when the system is far from a thermodynamic phase boundary. In a bottom‐up approach, the dynamic behavior observed here for an elementary reaction is finally extended to more relevant redox reactions and other metal catalysts, which underlines the importance of chemical dynamics for the formation and constant re‐generation of transient active sites during catalysis.

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Section: Introductionmentioning

confidence: 99%

Phase Coexistence and Structural Dynamics of Redox Metal Catalysts Revealed by Operando TEM

et al. 2021

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“…Even if the path is still long before we are able to overcome these obstacles and to offer beneficial treatments to patients, the zebrafish is a powerful model to help elucidate universal mechanisms of regeneration and to give clues about how and why more complex vertebrates erected barriers dampening this potential. The versatility of zebrafish enables the development of innovative models of regeneration and of novel technologies such as scRNAseq associated with CRISPR/Cas9 barcode editing for fine cell lineage tracing [ 104 ] and a growing number of genetic and metabolic reporter tools enabling non-toxic and non-invasive in vivo imaging to follow organ reconstruction and functional recovery. Associated with its regenerative capacity, all these assets confer the zebrafish with undeniable advantages over other preclinical models that will certainly accelerate research in regenerative medicine.…”

Section: Discussionmentioning

confidence: 99%

Zebra-Fishing for Regenerative Awakening in Mammals

2021

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Regeneration is defined as the ability to regrow an organ or a tissue destroyed by degeneration or injury. Many human degenerative diseases and pathologies, currently incurable, could be cured if functional tissues or cells could be restored. Unfortunately, humans and more generally mammals have limited regenerative capabilities, capacities that are even further declining with age, contrary to simpler organisms. Initially thought to be lost during evolution, several studies have revealed that regenerative mechanisms are still present in mammals but are latent and thus they could be stimulated. To do so there is a pressing need to identify the fundamental mechanisms of regeneration in species able to efficiently regenerate. Thanks to its ability to regenerate most of its organs and tissues, the zebrafish has become a powerful model organism in regenerative biology and has recently engendered a number of studies attesting the validity of awakening the regenerative potential in mammals. In this review we highlight studies, particularly in the liver, pancreas, retina, heart, brain and spinal cord, which have identified conserved regenerative molecular events that proved to be beneficial to restore murine and even human cells and which helped clarify the real clinical translation potential of zebrafish research to mammals.

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“…In order to shed more light on the interplay between catalyst and reactive species and to follow processes that lead to the emergence of catalytic activity, real-space and real-time observation of the active catalyst at high spatial resolution is required. 15,16 Since the ground-breaking work of Ernst Ruska, 17 in situ transmission electron microscopy (TEM) has transformed into a powerful method for the investigation of gas-solid interactions, delivering valuable insights about adsorbent-induced surface structuring, [18][19][20] particle shape reconstruction, [21][22][23] and phase changes 24,25 . The recent development of nanoreactors with silicon-based microelectromechanical systems (MEMS) technology has further enabled in situ TEM studies of catalysts at pressures up to ~ 1 bar and temperatures up to 1000 °C.…”

Section: Mainmentioning

confidence: 99%

Phase Coexistence and Structural Dynamics of Redox Metal Catalysts Revealed by Operando TEM

Huang

Jones²,

Fedorov³

et al. 2021

Preprint

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<div>Metal catalysts play an important role in industrial redox reactions. Although extensively studied, the state of these catalysts under operating conditions is largely unknown and assignments of active sites remain speculative. Herein, we present an operando transmission electron microscopy study that interrelates structural dynamics of redox metal catalysts to their activity. Using hydrogen oxidation on copper as an elementary redox reaction, we reveal how the interaction between metal and surrounding gas phase induces complex structural transformations and drives the system from a thermodynamic equilibrium towards a state controlled by chemical dynamics. Direct imaging combined with the simultaneous detection of catalytic activity provides unparalleled structureactivity insights that identify distinct mechanisms for water formation and reveals the means by which the system self-adjusts to changes of the gas phase chemical potential. Density function theory calculations show that surface phase transitions are driven by chemical dynamics even when the system is far from a thermodynamic phase boundary. In a bottom-up approach, the dynamic behavior observed here for an elementary reaction is finally extended to more relevant redox reactions and other metal catalysts, which underlines the importance of chemical dynamics for the formation and constant re-generation of transient active sites during catalysis. <br></div>

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Surface-reaction induced structural oscillations in the subsurface

Cited by 32 publications

References 74 publications

Phase Coexistence and Structural Dynamics of Redox Metal Catalysts Revealed by Operando TEM

Phase Coexistence and Structural Dynamics of Redox Metal Catalysts Revealed by Operando TEM

Zebra-Fishing for Regenerative Awakening in Mammals

Phase Coexistence and Structural Dynamics of Redox Metal Catalysts Revealed by Operando TEM

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