Publication date: 8th June 2021
Metal nanostructures with hollow interior have been attracted particular interest due to their low mass density and large reaction surface area. These unique properties of such structures allow their contribution to different scientific fields. Thus, Pt-based hollow nanocrystals (NCs) have brought their importance in catalytic and electrocatalytic applications. Apart from decreasing the consumption of Pt, hollowing processes also allow the formation of metal alloys, which make catalysts more efficient by improving their activity, selectivity and stability.Typically, Pt vs Ag system is used for the synthesis of void/shell structures, where Ag NCs are used as a sacrificial template. Despite the latest achievements in the production of these structures, this process is still challenging and difficult to control due to the low miscibility of Pt and Ag at room temperature.
Here we present how by controlling the synthetic route, we can produce hollow Pt-based NCs with various morphological features. [1] The synthetic strategies are based on galvanic replacement reaction (GRR) and Kirkendall effect, [2] where the initial step of the processes is the synthesis of Ag NCs template. [3] The control of the final product is achieved by the study of the roles of surfactant, reaction time and the use of additional chemical etching. Following this approach, we can produce Pt-based hollow NCs with controlled shell thickness, void size, porosity, and surface roughness. The evaluation of the catalytic activity of obtained NCs is demonstrated by a model reaction of 4-Nitrophenol (4NP) reduction. [4] The results of this experiment concluded that the catalytic performance of Pt-based hollow NCs is highly improved by controlling the morphological features of the NCs. This study shows the importance of reaction control to obtain the most possibly active catalyst.
Elizaveta Demakova acknowledges a financial support from the Spanish Ministry of Science and Innovation (MICINN) by a FPI-SO fellowship, resolved by the Agencia Estatal de Investigación (AEI) with reference (PRE2019-087880) and the Universitat Autònoma de Barcelona (UAB). Neus Bastús acknowledges financial support by MINECO through the Ramon y Cajal program (RYC-2012- 10991). Víctor Puntes acknowledges financial support by the Spanish MINECO through the Ramon y Cajal program (RYC-2012-10991). The Institut Català de Nanociència i Nanotecnologia (ICN2) is jointly supported by the Severo Ochoa program from the Spanish MINECO (Grant No. SEV-2017-0706) and the CERCA Programme/Generalitat de Catalunya.
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