Building Durable Multimetallic Electrocatalysts from Intermetallic Seeds
Abstract
When combined with earth-abundant metals, Pt-based alloy nanoparticles (NPs) can be cost-effective electrocatalysts. However, these NPs can experience leaching of non-noble-metal components under harsh electrocatalytic conditions. In this work, the Skrabalak group has demonstrated a novel NP construct in which Pt-based random alloy surfaces are stabilized against non-noble-metal leaching by their deposition onto intermetallic seeds. These core@shell NPs are highly durable electrocatalysts, with the ability to tune catalytic performance by the core@shell architecture, surface alloy composition, and NP shape. This versatility was demonstrated in a model system in which random alloy (ra-) PtM surfaces were deposited onto ordered intermetallic (i-) PdCu seeds using seed-mediated co-reduction (SMCR). In the initial demonstration, ra-PtCu shells were deposited on i-PdCu seeds, with these core@shell NPs exhibiting higher specific and mass activities for the oxygen reduction reaction (ORR) when compared to similarly sized ra-PtCu NPs. These NPs also showed outstanding durability, maintaining ~85% in specific activity after 5000 cycles. Characterization of the NPs after use revealed minimal loss of Cu. The activity enhancement was attributed to the strained surface that arises from the lattice mismatch between the intermetallic core and random alloy surface. The outstanding durability was attributed to the ordered structure of the intermetallicmore »
- Authors:
-
- Indiana Univ., Bloomington, IN (United States)
- Publication Date:
- Research Org.:
- Indiana Univ., Bloomington, IN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1771337
- Grant/Contract Number:
- SC0018961
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Accounts of Chemical Research
- Additional Journal Information:
- Journal Volume: 54; Journal Issue: 7; Journal ID: ISSN 0001-4842
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Metals; Alloys; Intermetallics; Catalysts; Durability
Citation Formats
Bueno, Sandra A., Ashberry, Hannah M., Shafei, Ibrahim, and Skrabalak, Sara E. Building Durable Multimetallic Electrocatalysts from Intermetallic Seeds. United States: N. p., 2020.
Web. doi:10.1021/acs.accounts.0c00655.
Bueno, Sandra A., Ashberry, Hannah M., Shafei, Ibrahim, & Skrabalak, Sara E. Building Durable Multimetallic Electrocatalysts from Intermetallic Seeds. United States. https://doi.org/10.1021/acs.accounts.0c00655
Bueno, Sandra A., Ashberry, Hannah M., Shafei, Ibrahim, and Skrabalak, Sara E. Wed .
"Building Durable Multimetallic Electrocatalysts from Intermetallic Seeds". United States. https://doi.org/10.1021/acs.accounts.0c00655. https://www.osti.gov/servlets/purl/1771337.
@article{osti_1771337,
title = {Building Durable Multimetallic Electrocatalysts from Intermetallic Seeds},
author = {Bueno, Sandra A. and Ashberry, Hannah M. and Shafei, Ibrahim and Skrabalak, Sara E.},
abstractNote = {When combined with earth-abundant metals, Pt-based alloy nanoparticles (NPs) can be cost-effective electrocatalysts. However, these NPs can experience leaching of non-noble-metal components under harsh electrocatalytic conditions. In this work, the Skrabalak group has demonstrated a novel NP construct in which Pt-based random alloy surfaces are stabilized against non-noble-metal leaching by their deposition onto intermetallic seeds. These core@shell NPs are highly durable electrocatalysts, with the ability to tune catalytic performance by the core@shell architecture, surface alloy composition, and NP shape. This versatility was demonstrated in a model system in which random alloy (ra-) PtM surfaces were deposited onto ordered intermetallic (i-) PdCu seeds using seed-mediated co-reduction (SMCR). In the initial demonstration, ra-PtCu shells were deposited on i-PdCu seeds, with these core@shell NPs exhibiting higher specific and mass activities for the oxygen reduction reaction (ORR) when compared to similarly sized ra-PtCu NPs. These NPs also showed outstanding durability, maintaining ~85% in specific activity after 5000 cycles. Characterization of the NPs after use revealed minimal loss of Cu. The activity enhancement was attributed to the strained surface that arises from the lattice mismatch between the intermetallic core and random alloy surface. The outstanding durability was attributed to the ordered structure of the intermetallic core. The origin of this durability enhancement was investigated by classical molecular dynamics simulations, where Pt atoms were found to have a lower potential energy when deposited on an intermetallic core than when deposited on a random alloy core. Also, ordering of Cu atoms at the core@shell interface appears to enhance the overall binding between the core and the shell materials. Inspired by this initial demonstration, SMCR has been used to achieve shells of different random alloy compositions, PtM (M = Ni, Co, Cu, or Fe). This advance is significant because ligand effects vary as a function of PtM identity and Pt/M ratio. These features also influence the degree of surface strain imparted from the lattice mismatch between the core and shell materials. Like the initial demonstration, standout features of these core@shell NPs were high durability and resistance to non-noble metal leaching. Moving forward, efforts have been directed toward integrating shape-control to this core@shell NP construct. This integration is motivated by the shape-dependent catalytic performance of NPs derived from the selective expression of specific facets. Considering the initial i-PdCu@ra-PtCu system, NPs with a cubic shape have been achieved by judicious selection of capping ligands during SMCR. Evaluation of these NPs as catalysts for the electrooxidation of formic acid found that the nanocubic shape enhances catalytic performance compared to similar core@shell NPs with a spherical morphology. We envision that SMCR can be applied to other NP systems to achieve highly durable catalysts as the syntheses of monodisperse and shape-controlled intermetallic seeds are advanced. This Account highlights the role of intermetallic cores in providing more durable electrocatalysts. More broadly, the versatility of SMCR is highlighted as a route to integrate architecture, alloy surfaces, and shape within one NP system, and how this achievement is inspiring new high-performance and robust catalysts is discussed.},
doi = {10.1021/acs.accounts.0c00655},
journal = {Accounts of Chemical Research},
number = 7,
volume = 54,
place = {United States},
year = {Wed Dec 30 00:00:00 EST 2020},
month = {Wed Dec 30 00:00:00 EST 2020}
}
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