Modulating the water gas shift reaction <i>via</i> strong interfacial interaction between a defective oxide matrix and exsolved metal nanoparticles

Chen, Huijun; Huang, Rui; Jang, Myeong Gon; Lim, Chaesung; Shin, Dongjae; Liu, Qiuyu; Yang, Heejae; Chen, Yan; Han, Jeong Woo

doi:10.1039/d2ta08217a

Cited by 4 publications

(2 citation statements)

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“…While these works demonstrated the modulated electronic structure due to exsolution, how the local surface electronic structure evolved during exsolution still remains unknown. In this work, Pr 0.4 Sr 0.6 Co 0.2 Fe 0.7 Nb 0.1 O 3 (PSCFN), a representative exsolution system with high catalytic activity and relatively low exsolution temperature, 30,44 was taken as the model system. We synthesized epitaxial PSCFN thin film by pulsed laser deposition (PLD).…”

Section: Introductionmentioning

confidence: 99%

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Electronic Activation during Nanoparticle Exsolution for Enhanced Activity at Elevated Temperature

et al. 2023

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Nanoparticle (NP) exsolution from perovskite-based oxides matrix upon reduction has emerged as an ideal platform for designing highly active catalysts for energy and environmental applications. However, the mechanism of how the material characteristics impacts the activity is still ambiguous. In this work, taking Pr0.4Sr0.6Co0.2Fe0.7Nb0.1O3 thin film as the model system, we demonstrate the critical impact of the exsolution process on the local surface electronic structure. Combining advanced microscopic and spectroscopic techniques, particularly scanning tunneling microscopy/spectroscopy and synchrotron-based near ambient X-ray photoelectron spectroscopy, we find that the band gaps of both the oxide matrix and exsolved NP decrease during exsolution. Such changes are attributed to the defect state within the forbidden band introduced by oxygen vacancies and the charge transfer across the NP/matrix interface. Both the electronic activations of oxide matrix and the exsolved NP phase lead to good electrocatalytic activity toward the fuel oxidation reaction at elevated temperature.

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Section: Introductionmentioning

confidence: 99%

“…In this work, Pr 0.4 Sr 0.6 Co 0.2 Fe 0.7 Nb 0.1 O 3 (PSCFN), a representative exsolution system with high catalytic activity and relatively low exsolution temperature, , was taken as the model system. We synthesized epitaxial PSCFN thin film by pulsed laser deposition (PLD).…”

Section: Introductionmentioning

confidence: 99%