AI Article Synopsis
- This study focuses on the creation of well-ordered platinum nanocubes (Pt NCs) using a microemulsion process within a block copolymer (BC) nanotemplate, which acts as a microreactor.
- By manipulating the concentration of HCl, researchers found that the shape of platinum nanoparticles (NPs) changes from quasi-spherical to nanocubes, influenced by the differences in adsorption energies of Cl and HCl as revealed by density functional theory (DFT) computations.
- The Pt NCs exhibit improved electrochemical performance, showing a 2.8-fold increase in mass activity for ethanol oxidation compared to a commercial catalyst, alongside notable stability with only a 2.2% loss in electrochemical
Article Abstract
In this work, well-ordered platinum (Pt) nanocubes (NCs), with precise control on the size and the spatial arrangement, are synthesized from a microemulsion overgrowth in a block copolymer (BC) nanotemplate. The nanovials on this self-assembled BC template serve as microreactors for the reduction of the HCl/HPtCl precursor and direct the ordered periodic arrangement of the reduced Pt nanoparticles (NPs). As the content of HCl increases from 0% to 25%, the Pt NPs evolve from quasi-spheres to NCs, for which the density functional theory (DFT) computation reveals that the different adsorption energies of Cl and HCl dominate this morphology transition. For their potential application in fuel cells, the electrochemical catalysis of the Pt NCs demonstrates a 2.8-fold mass activity in contrast to the commercial JM 40% catalyst at the same Pt loading in ethanol oxidation reaction (EOR) and a good stability of 2.2% ECSA loss over 10 000 CV cycling.
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| http://dx.doi.org/10.1021/acs.analchem.0c01854 | DOI Listing |
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