Sized-controlled Pd nanoflowers by a non-classical growth mechanism combining the LaMer and DLVO theories and their catalytic activities

Autor(es)

de Lima, Scarllett L. S. ; Miguel, Vitor M. ; Rosado, Taissa F. ; V. Petri, Marcos V. ; Gardener, Jules ; Avillez, Roberto ; Rodrigues, Thenner S. ; de Torresi, Susana I. Cordoba ; Solorzano, Guillermo ; da Silva, Anderson G. M.

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS TODAY COMMUNICATIONS; v. 33, p. 8-pg., 2022-09-09.

Resumo

We describe the synthesis of Pd nanoflowers in a single reaction step by reducing PdCl4 2-(aq) with hydroquinone. Simply by controlling the reaction temperature, we could obtain monodisperse Pd nanoflowers with well-defined shapes and sizes. Based on the detected product morphology, crystallinity, and several control experiments, a novel non-classical mechanism based on both LaMer and DLVO theories was established. Specifically, Pd nanoclusters were produced at the initial stages of the reaction, followed by their fusion to form larger poly-crystalline Pd nanoparticles. These polycrystalline Pd nanoparticles served as seeds for further Pd deposition and attachment of Pd nanoclusters to generate Pd nanoflowers. In this procedure, the control over the temperature enabled us to tune the ionic strength of the solution (control over the fraction of PdCl42-and K+ ions present in the solution), which affected the attachment and aggregation steps, leading to Pd nanoflowers with controlled sizes and morphologies. When these nanomaterials were employed as nanocatalysts for electrooxidation of ethanol, the 12 nm-Pd nanoflowers were the best catalyst in terms of both activity and peak potential. (AU)

• Processo FAPESP: 15/26308-7 - Otimização das propriedades físico-químicas de materiais nano-estruturados e suas aplicações em reconhecimento molecular, catálise e conversão/armazenamento de energia
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/15885-4 - Estudo plasmônico da aplicação de nanopartículas de MnO2/Au como sensor eletroquímico de H2O2 por método de deposição eletroestática layer-by-layer
• Beneficiário: Vítor Mendes Miguel
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 21/00675-4 - Arquitetura de materiais para armazenamento de energia eletroquímica e catálise
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Temático