Enhanced oxygen reduction activity with rare earth metal alloy catalysts in proton exchange membrane fuel cells

Eriksson, Björn; Montserrat‐Sisó, Gerard; Brown, Rosemary; Škála, Tomáš; Lindström, Rakel Wreland; Lindbergh, Göran; Wickman, Björn

doi:10.1016/j.electacta.2021.138454

Cited by 13 publications

(8 citation statements)

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“…500 mA cm −2 at 0.6 V) [43] . Besides, sputter deposited thin films of Pt 3 Y, Pt 5 Gd and Pt 5 Tb were evaluated as cathode electrocatalysts in PEMFC, and an ORR enhancement factor of 2.0–2.5 over pure Pt was observed [44] …”

Section: Applications In Pemfc Cathodesmentioning

confidence: 99%

“…[43] Besides, sputter deposited thin films of Pt 3 Y, Pt 5 Gd and Pt 5 Tb were evaluated as cathode electrocatalysts in PEMFC, and an ORR enhancement factor of 2.0-2.5 over pure Pt was observed. [44] Gasteiger's group has reported a Pt x Y/C electrocatalyst prepared by impregnation of commercial Pt/C with YCl 3 and its subsequent heat-treatment under H 2 at 1200 °C. [35a] In the halfcell characterization, Pt x Y/C displayed lower ORR activity than commercial Pt/C (210 and 270 A g Pt À 1 , respectively).…”

Section: Applications In Pemfc Cathodesmentioning

confidence: 99%

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Platinum‐Rare Earth Alloy Electrocatalysts for the Oxygen Reduction Reaction: A Brief Overview

et al. 2022

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The development of highly active and long-term stable electrocatalysts for the cathode of proton-exchange membrane fuel cells (PEMFC) is a paramount requirement for high performance and durable PEMFC stacks. In this regard, alloying Pt with rare earth metals (REM) has emerged as a promising approach. This short review summarizes and discusses the most relevant advances on Pt-REM alloy electrocatalysts, from bulk polycrystalline surfaces to carbon supported nanostructures, for the oxygen reduction reaction (ORR), and their implementation in PEMFCs, and is a starting point to establish the challenges in synthesis and design and properties goals for novel Pt-REM alloys.

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Section: Applications In Pemfc Cathodesmentioning

confidence: 99%

Section: Applications In Pemfc Cathodesmentioning

confidence: 99%

Platinum‐Rare Earth Alloy Electrocatalysts for the Oxygen Reduction Reaction: A Brief Overview

et al. 2022

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“…These alloys include metals such as Ni, Co, Fe, Cu, Au, Pd, La, Y and many others. [7][8][9][10][11] While concerns with demand for metals such as Au, Ni, Co and Y would be somewhat relevant in the largescale production of nanoalloy catalysts, the abundance of Pt is approximately three orders of magnitude lower than that of these metals (excluding Pd), rendering Pt as the bottleneck in terms of demand and scarcity issues. The cost issue associated with Au and Pd is alleviated through a significant improvement in either the activity or stability of alloyed Pt-based electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

The role of high-resolution transmission electron microscopy and aberration corrected scanning transmission electron microscopy in unraveling the structure–property relationships of Pt-based fuel cells electrocatalysts

Bijelić,

Ruiz-Zepeda,

Hodnik

2024

Inorg. Chem. Front.

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“…However, the widespread commercialization of PEMFCs in automotive vehicles is currently impeded by their high cost and limited lifetime, which in turn is greatly attributed to the large amounts of platinum needed to catalyze the sluggish oxygen reduction reaction (ORR) kinetics in the cathode . Thus, a large portion of PEMFC research has focused on lowering their cost by decreasing the amount of platinum in the cathode through alloying and microstructuring. − So far, platinum and platinum alloys remain as the catalyst benchmark for ORR in acidic media, but their thermodynamic instability in acidic conditions together with their scarcity and high cost demand alternative routes toward precious-metal catalyst eradication.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Activity of Silver Alloys for the Oxygen Reduction Reaction in Alkaline Media

Montserrat‐Sisó

Wickman

2023

ACS Appl. Energy Mater.

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Ag-based catalysts have recently attracted much attention as potential candidates to substitute costly Pt-based electrocatalysts for the oxygen reduction reaction (ORR) in alkaline media. Although the electrocatalytic activity of Pt-based alloys is known to exhibit a strong dependence on their electronic structures, a relationship between electronic structure and the ORR mechanism in Ag-based alloys still remains to be elucidated. Herein, by means of physical vapor deposition, we prepare Ag binary thin films (CoAg, CuAg, AuAg, and FeAg) with well-controlled compositions as a tool to investigate the ORR mechanism on Ag surfaces. The bimetallic thin films are evaluated for their ORR performance in alkaline media, and their specific activity at 0.8 VRHE is shown to correlate with the Ag electronic structure. Even though all thin films show different responses to potential cycling, all bimetallic samples exhibit a surface Ag enrichment after ORR. It is shown that the ORR occurs through different mechanisms on these Ag-rich surfaces, which in turn is potential-dependent. Tafel slopes reveal faster ORR kinetics at low overpotentials on all surfaces, whereas only CuAg surpasses pure Ag at higher overpotentials. Moreover, despite their incomplete O2 reduction, CuAg and AuAg exhibit an overall superior ORR activity over pure Ag, with a more than 2-fold increase in specific activity at 0.8 VRHE attributed to enhancements originating from electronic effects and surface defects, respectively. Since the potential-dependent improved ORR mechanism observed for Ag bimetallic samples makes a rational design of Ag-based electrocatalysts difficult, these results aim to provide insights for a more tailored design of electrocatalysts by shedding light on the mechanisms through which the ORR kinetics are improved on Ag surfaces in alkaline media.

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Enhanced oxygen reduction activity with rare earth metal alloy catalysts in proton exchange membrane fuel cells

Cited by 13 publications

References 46 publications

Platinum‐Rare Earth Alloy Electrocatalysts for the Oxygen Reduction Reaction: A Brief Overview

Platinum‐Rare Earth Alloy Electrocatalysts for the Oxygen Reduction Reaction: A Brief Overview

The role of high-resolution transmission electron microscopy and aberration corrected scanning transmission electron microscopy in unraveling the structure–property relationships of Pt-based fuel cells electrocatalysts

Tuning the Activity of Silver Alloys for the Oxygen Reduction Reaction in Alkaline Media

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