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Title: | Intermetallic hcp-PtBi/fcc-Pt core/shell nanoplates enable efficient bifunctional oxygen reduction and methanol oxidation electrocatalysis | Authors: | Qin, Y Luo, M Sun, Y Li, C Huang, B Yang, Y Li, Y Wang, L Guo, S |
Issue Date: | 1-Jun-2018 | Source: | ACS catalysis, 1 June 2018, v. 8, no. 6, p. 5581-5590 | Abstract: | Two dimensional (2D), ordered intermetallic and core/shell architectures are highly desirable structural features for promoting electrocatalysis on Pt-based nanocrystals in terms of activity, durability, and cost. However, it is currently an extreme challenge to achieve all these features in a single catalytic nanostructure. Herein, we report a new class of 2D nanoplate catalyst composed of intermetallic hcp-PtBi core and ultrathin fcc-Pt shell synthesized by a facile one-pot wet-chemical approach. The unique structural features of PtBi/Pt core/shell nanoplates make them exhibit the highest oxygen reduction reaction (ORR) activity in all the reported PtBi-based catalytic systems and 5 times more active than commercial Pt/C catalyst for ORR. The combination of cyclic voltammograms, X-ray photoelectron spectroscopy, and density functional theory calculations reveals that an optimal oxygen adsorption energy and efficient reduction on both edge surface and interface regions between Pt-shell and PtBi-core from hcp-PtBi/fcc-Pt core/shell nanoplates relative to that on commercial Pt, deriving from the Bi-p empty band suppression at the core/shell interface, is the key to greatly boosting the ORR activity of the PtBi nanocatalyst system. The PtBi-Pt interface performs at relatively lower overpotential compared with the edge surface because of excellent reduction from OH to the H2O. Thanks to the intermetallic phase and core/shell architecture, hcp-PtBi/fcc-Pt core/shell nanoplates show little loss in electrochemically active surface area and ORR activity during the accelerated durability test. They also show enhanced catalytic performance for the electro-oxidation of liquid fuels in both acid and alkaline electrolytes. This work sheds light on the rational design of new 2D core/shell nanostructured catalysts for enhancing fuel-cell electrocatalysis. | Keywords: | Oxygen reduction reaction PtBi Nanoplates Intermetallic Core/shell |
Publisher: | American Chemical Society | Journal: | ACS catalysis | EISSN: | 2155-5435 | DOI: | 10.1021/acscatal.7b04406 | Rights: | © 2018 American Chemical Society This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Catalysis, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acscatal.7b04406. |
Appears in Collections: | Journal/Magazine Article |
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Intermetallic_Nanoplates_Enable.pdf | Pre-Published version | 3.34 MB | Adobe PDF | View/Open |
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