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Title: PdCu Nanoalloy Electrocatalysts in Oxygen Reduction Reaction: Role of Composition and Phase State in Catalytic Synergy

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [2];  [2];  [2];  [3];  [2]
  1. State Univ. of New York (SUNY), Binghamton, NY (United States); Chongqing Univ. (China)
  2. State Univ. of New York (SUNY), Binghamton, NY (United States)
  3. Central Michigan Univ., Mount Pleasant, MI (United States)

The catalytic synergy of nanoalloy catalysts depends on the nanoscale size, composition, phase state, and surface properties. This report describes findings of an investigation of their roles in the enhancement of electrocatalytic activity of PdCu alloy nanoparticle catalysts for oxygen reduction reaction (ORR). In this work PdnCu100–n nanoalloys with controlled composition and subtle differences in size and phase state were synthesized by two different wet chemical methods. Detailed electrochemical characterization was performed to determine the surface properties and the catalytic activities. The atomic-scale structures of these catalysts were also characterized by high-energy synchrotron X-ray diffraction coupled with atomic pair distribution function analysis. The electrocatalytic activity and stability were shown to depend on the size, composition, and phase structure. With PdnCu100–n catalysts from both methods, a maximum ORR activity was revealed at Pd/Cu ratio close to 50:50. Structurally, Pd50Cu50 nanoalloys feature a mixed phase consisting of chemically ordered (body-centered cubic type) and disordered (face-centered cubic type) domains. The phase-segregated structure is shown to change to a single phase upon electrochemical potential cycling in ORR condition. While the surface Cu dissolution occurred in PdCu catalysts from the two different synthesis methods, the PdCu with a singlephase character is found to exhibit a tendency of a much greater dissolution than that with the phase segregation. Analysis of the results, along theoretical modeling based on density functional theory calculation, has provided new insights for the correlation between the electrocatalytic activity and the catalyst structures.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0006877; AC02-06CH11357
OSTI ID:
1237750
Journal Information:
ACS Applied Materials and Interfaces, Vol. 7, Issue 46; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 70 works
Citation information provided by
Web of Science

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Cited By (15)

Highly active and durable Pd-Cu catalysts for oxygen reduction in alkaline exchange membrane fuel cells journal September 2017
Cu–Pd bimetallic nanoalloy anchored on a N-rich porous organic polymer for high-performance hydrodeoxygenation of biomass-derived vanillin journal January 2018
DFT Study on Intermetallic Pd–Cu Alloy with Cover Layer Pd as Efficient Catalyst for Oxygen Reduction Reaction journal December 2017
Enhanced Oxygen Reduction Activity on Carbon Supported Pd Nanoparticles Via SiO 2 journal January 2019
Voltammetric determination of vitamin B2 by using a highly porous carbon electrode modified with palladium-copper nanoparticles journal April 2019
Charting the relationship between phase type-surface area-interactions between the constituent atoms and oxygen reduction activity of Pd–Cu nanocatalysts inside fuel cells by in operando high-energy X-ray diffraction journal January 2017
Effect of Chemical Composition on the Nanoscale Ordering Transformations of Physical Mixtures of Pd and Cu Nanoparticles journal September 2018
Beyond 1.0 W cm −2 Performance without Platinum: The Beginning of a New Era in Anion Exchange Membrane Fuel Cells journal January 2018
High‐Performance Ordered PdCuFe/C Intermetallic Catalyst for Electrochemical Oxygen Reduction in Proton Exchange Membrane Fuel Cells journal May 2019
Achieving High Activity and Stability of Carbon Supported Pd-Cu Alloyed Catalysts for Fuel Cell Applications journal January 2019
Regulating the Catalytic Dynamics Through a Crystal Structure Modulation of Bimetallic Catalyst journal January 2020
Synergistically Enhanced Oxygen Reduction Electrocatalysis by Subsurface Atoms in Ternary PdCuNi Alloy Catalysts journal February 2018
Non-Pt Nanostructured Catalysts for Oxygen Reduction Reaction: Synthesis, Catalytic Activity and its Key Factors journal July 2016
Flame-based synthesis and in situ functionalization of palladium alloy nanoparticles journal September 2018
Ternary PtVCo dendrites for the hydrogen evolution reaction, oxygen evolution reaction, overall water splitting and rechargeable Zn–air batteries journal January 2018

Figures / Tables (10)


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