Operando 3D imaging of defects dynamics of twinned-nanocrystal during catalysis

Autor(es)

Meneau, Florian ^[1] ; Rochet, Amelie ^[1] ; Harder, Ross ^[2] ; Cha, Wonsuk ^[2] ; Ribeiro Passos, Aline ^[1]

Afiliação do(s) autor(es)

^[1] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil

^[2] Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS-CONDENSED MATTER; v. 33, n. 27 JUL 7 2021.
• Citações Web of Science: 0

Resumo

Using operando Bragg coherent x-ray diffraction imaging, we visualised three-dimensionally a single twinned-gold nanocrystal during the CO oxidation reaction. We describe the defect dynamics process occurring under operating conditions and indicate the correlation between the nucleation of highly strained regions at the surface of the nanocrystal and its catalytic activity. Understanding the twinning deformation mechanism sheds light on the creation of active sites, and could well contribute to the understanding of the catalytic behaviour of other catalysts. With the start-up of 4th generation synchrotron sources, we anticipate that coherent hard x-ray diffraction imaging techniques will play a major role in imaging in situ chemical processes. (AU)

• Processo FAPESP: 14/25964-5 - Dos monômeros às nanopartículas: investigação in situ da formação de nanopartículas de ouro em tempo real por técnicas síncrotron e de microscopia
• Beneficiário: Florian Edouard Pierre Meneau
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 18/08816-3 - Difração coerente de raios X em condições operando: imageamento em 3D de catalisadores nanoparticulados
• Beneficiário: Aline Ribeiro Passos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/23050-4 - Abordagem multimodal para caracterizar catalisadores em operação
• Beneficiário: Amélie Claire Rochet
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores