TY - JOUR
T1 - Silver-Assisted Synthesis of High-Indexed Palladium Tetrahexahedral Nanoparticles and Their Morphological Variants
AU - Satyavolu, Nitya Sai Reddy
AU - Peinetti, Ana Sol
AU - Wang, Yiming
AU - Ali, Arzeena Sultana
AU - Lin, Jeffrey Wayjer
AU - Lu, Yi
N1 - Funding Information:
The research described in this paper is part of the Chemical Transformations Initiative at Pacific Northwest National Laboratory (PNNL). It was conducted under the Laboratory Directed Research and Development Program at PNNL, a multiprogram national laboratory operated by Battelle for the U.S. Department of Energy. N.S.R.S. thanks the Beckman Graduate Fellowship for financial support. A.S.P. thanks the PEW Latin American Fellowship for financial support. The authors thank Prof. Hong Yang and Prof. Catherine J. Murphy for their insightful discussions. SEM and TEM images were collected at the Federick Seitz Materials Research Laboratory Central Research Facilities, University of Illinois. The authors also thank Dr. Igor Petrik for the XRD measurements and Vishwas Srivastava for helpful discussions.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/4/23
Y1 - 2019/4/23
N2 - Palladium (Pd) nanoparticles enclosed by high-energy facets have displayed superior catalytic properties over that of their low-indexed counterparts. However, current methods of the synthesis are neither scalable nor cost-effective. In this study, we report a simple silver-assisted seed-mediated protocol to yield monodisperse palladium tetrahexahedral (THH) nanoparticles enclosed by the high-energy {730} facets. Additionally, their structural variants, truncated and stellated Pd THHs, with tunable size and sharpness have been synthesized. We show that introducing silver ions in the growth solution plays a key role in the growth of the nanoparticles. On the basis of kinetic studies, we find that the basis for the formation of these open structures is the underpotential deposition of Ag that stabilizes these high-energy surfaces and the overall mechanism of the growth is proposed. This study establishes a synthetic procedure that is scalable and is both chemically and economically more accessible than the existing protocols for Pd THH nanoparticles, making it possible for much wider applications of the Pd THH nanoparticles and its variants. Finally, these particles displayed higher electrocatalytic activity for ethanol oxidation reaction compared to low-indexed faceted Pd nanoparticles and commercially available Pd catalysts.
AB - Palladium (Pd) nanoparticles enclosed by high-energy facets have displayed superior catalytic properties over that of their low-indexed counterparts. However, current methods of the synthesis are neither scalable nor cost-effective. In this study, we report a simple silver-assisted seed-mediated protocol to yield monodisperse palladium tetrahexahedral (THH) nanoparticles enclosed by the high-energy {730} facets. Additionally, their structural variants, truncated and stellated Pd THHs, with tunable size and sharpness have been synthesized. We show that introducing silver ions in the growth solution plays a key role in the growth of the nanoparticles. On the basis of kinetic studies, we find that the basis for the formation of these open structures is the underpotential deposition of Ag that stabilizes these high-energy surfaces and the overall mechanism of the growth is proposed. This study establishes a synthetic procedure that is scalable and is both chemically and economically more accessible than the existing protocols for Pd THH nanoparticles, making it possible for much wider applications of the Pd THH nanoparticles and its variants. Finally, these particles displayed higher electrocatalytic activity for ethanol oxidation reaction compared to low-indexed faceted Pd nanoparticles and commercially available Pd catalysts.
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U2 - 10.1021/acs.chemmater.9b00275
DO - 10.1021/acs.chemmater.9b00275
M3 - Article
AN - SCOPUS:85064833282
SN - 0897-4756
VL - 31
SP - 2923
EP - 2929
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 8
ER -