Tuning the Oxygen Reduction Activity and Stability of Ni(OH)2@Pt/C Catalysts through Controlling Pt Surface Composition, Strain, and Electronic Structure

Fernando Godínez-Salomón; Christopher P. Rhodes; K. Suarez Alcantara; Qiushi Zhu; S. E. Canton; H. A. Calderon; J. L. Reyes-Rodríguez; M. A. Leyva; O. Solorza-Feria

doi:10.1016/j.electacta.2017.06.073

Tuning the Oxygen Reduction Activity and Stability of Ni(OH)₂@Pt/C Catalysts through Controlling Pt Surface Composition, Strain, and Electronic Structure

Fernando Godínez-Salomón, Christopher P. Rhodes, K. Suarez Alcantara, Qiushi Zhu, S. E. Canton, H. A. Calderon, J. L. Reyes-Rodríguez, M. A. Leyva, O. Solorza-Feria

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Nanoparticles of Ni(OH)₂ surrounded with ultra-low Pt content and supported on functionalized carbon were prepared by a scalable synthesis method and investigated as electrocatalysts for the oxygen reduction reaction (ORR) in acidic media. The effect of altering the Pt surface composition on the Ni(OH)₂ nanoparticle core was investigated as a route to simultaneously increase the ORR activity and stability. Modifying the Pt surface composition resulted in both structural and electronic changes. Decreasing the Pt surface composition resulted in stronger Pt-Pt compressive strain and decrease in the occupancy of d-band vacancies per atom. The correlation of strain and d-vacancies with ORR activity and stability showed a Volcano-type tendency, with the 6 wt. % Pt sample showing the highest activity and stability. The electrochemical results obtained using rotating disk electrode (RDE) tests showed an enhancement of about six times higher surface and mass-normalized activity as well as improved durability compared to commercial Pt/C. These improvements were further corroborated by single cell membrane electrode assembly (MEA) tests where similar trends were observed, showing higher power densities with lower Pt loadings, in comparison with commercial Pt/C. These results show that new electrocatalysts with higher activity and stability can be obtained through precise control of the atomic-level catalyst structure.

Original language	English
Pages (from-to)	958-969
Number of pages	12
Journal	Electrochimica Acta
Volume	247
DOIs	https://doi.org/10.1016/j.electacta.2017.06.073
State	Published - 1 Sep 2017
Externally published	Yes

Keywords

Core-shell nanoparticles
electronic effect
fuel cells
lattice strain
oxygen reduction

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10.1016/j.electacta.2017.06.073

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Godínez-Salomón, F., Rhodes, C. P., Alcantara, K. S., Zhu, Q., Canton, S. E., Calderon, H. A., Reyes-Rodríguez, J. L., Leyva, M. A., & Solorza-Feria, O. (2017). Tuning the Oxygen Reduction Activity and Stability of Ni(OH)₂@Pt/C Catalysts through Controlling Pt Surface Composition, Strain, and Electronic Structure. Electrochimica Acta, 247, 958-969. https://doi.org/10.1016/j.electacta.2017.06.073

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title = "Tuning the Oxygen Reduction Activity and Stability of Ni(OH)2@Pt/C Catalysts through Controlling Pt Surface Composition, Strain, and Electronic Structure",

abstract = "Nanoparticles of Ni(OH)2 surrounded with ultra-low Pt content and supported on functionalized carbon were prepared by a scalable synthesis method and investigated as electrocatalysts for the oxygen reduction reaction (ORR) in acidic media. The effect of altering the Pt surface composition on the Ni(OH)2 nanoparticle core was investigated as a route to simultaneously increase the ORR activity and stability. Modifying the Pt surface composition resulted in both structural and electronic changes. Decreasing the Pt surface composition resulted in stronger Pt-Pt compressive strain and decrease in the occupancy of d-band vacancies per atom. The correlation of strain and d-vacancies with ORR activity and stability showed a Volcano-type tendency, with the 6 wt. % Pt sample showing the highest activity and stability. The electrochemical results obtained using rotating disk electrode (RDE) tests showed an enhancement of about six times higher surface and mass-normalized activity as well as improved durability compared to commercial Pt/C. These improvements were further corroborated by single cell membrane electrode assembly (MEA) tests where similar trends were observed, showing higher power densities with lower Pt loadings, in comparison with commercial Pt/C. These results show that new electrocatalysts with higher activity and stability can be obtained through precise control of the atomic-level catalyst structure.",

keywords = "Core-shell nanoparticles, electronic effect, fuel cells, lattice strain, oxygen reduction",

author = "Fernando God{\'i}nez-Salom{\'o}n and Rhodes, {Christopher P.} and Alcantara, {K. Suarez} and Qiushi Zhu and Canton, {S. E.} and Calderon, {H. A.} and Reyes-Rodr{\'i}guez, {J. L.} and Leyva, {M. A.} and O. Solorza-Feria",

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doi = "10.1016/j.electacta.2017.06.073",

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Godínez-Salomón, F, Rhodes, CP, Alcantara, KS, Zhu, Q, Canton, SE, Calderon, HA, Reyes-Rodríguez, JL, Leyva, MA & Solorza-Feria, O 2017, 'Tuning the Oxygen Reduction Activity and Stability of Ni(OH)₂@Pt/C Catalysts through Controlling Pt Surface Composition, Strain, and Electronic Structure', Electrochimica Acta, vol. 247, pp. 958-969. https://doi.org/10.1016/j.electacta.2017.06.073

TY - JOUR

T1 - Tuning the Oxygen Reduction Activity and Stability of Ni(OH)2@Pt/C Catalysts through Controlling Pt Surface Composition, Strain, and Electronic Structure

AU - Godínez-Salomón, Fernando

AU - Rhodes, Christopher P.

AU - Alcantara, K. Suarez

AU - Zhu, Qiushi

AU - Canton, S. E.

AU - Calderon, H. A.

AU - Reyes-Rodríguez, J. L.

AU - Leyva, M. A.

AU - Solorza-Feria, O.

PY - 2017/9/1

Y1 - 2017/9/1

N2 - Nanoparticles of Ni(OH)2 surrounded with ultra-low Pt content and supported on functionalized carbon were prepared by a scalable synthesis method and investigated as electrocatalysts for the oxygen reduction reaction (ORR) in acidic media. The effect of altering the Pt surface composition on the Ni(OH)2 nanoparticle core was investigated as a route to simultaneously increase the ORR activity and stability. Modifying the Pt surface composition resulted in both structural and electronic changes. Decreasing the Pt surface composition resulted in stronger Pt-Pt compressive strain and decrease in the occupancy of d-band vacancies per atom. The correlation of strain and d-vacancies with ORR activity and stability showed a Volcano-type tendency, with the 6 wt. % Pt sample showing the highest activity and stability. The electrochemical results obtained using rotating disk electrode (RDE) tests showed an enhancement of about six times higher surface and mass-normalized activity as well as improved durability compared to commercial Pt/C. These improvements were further corroborated by single cell membrane electrode assembly (MEA) tests where similar trends were observed, showing higher power densities with lower Pt loadings, in comparison with commercial Pt/C. These results show that new electrocatalysts with higher activity and stability can be obtained through precise control of the atomic-level catalyst structure.

AB - Nanoparticles of Ni(OH)2 surrounded with ultra-low Pt content and supported on functionalized carbon were prepared by a scalable synthesis method and investigated as electrocatalysts for the oxygen reduction reaction (ORR) in acidic media. The effect of altering the Pt surface composition on the Ni(OH)2 nanoparticle core was investigated as a route to simultaneously increase the ORR activity and stability. Modifying the Pt surface composition resulted in both structural and electronic changes. Decreasing the Pt surface composition resulted in stronger Pt-Pt compressive strain and decrease in the occupancy of d-band vacancies per atom. The correlation of strain and d-vacancies with ORR activity and stability showed a Volcano-type tendency, with the 6 wt. % Pt sample showing the highest activity and stability. The electrochemical results obtained using rotating disk electrode (RDE) tests showed an enhancement of about six times higher surface and mass-normalized activity as well as improved durability compared to commercial Pt/C. These improvements were further corroborated by single cell membrane electrode assembly (MEA) tests where similar trends were observed, showing higher power densities with lower Pt loadings, in comparison with commercial Pt/C. These results show that new electrocatalysts with higher activity and stability can be obtained through precise control of the atomic-level catalyst structure.

KW - Core-shell nanoparticles

KW - electronic effect

KW - fuel cells

KW - lattice strain

KW - oxygen reduction

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U2 - 10.1016/j.electacta.2017.06.073

DO - 10.1016/j.electacta.2017.06.073

M3 - Artículo

SN - 0013-4686

VL - 247

SP - 958

EP - 969

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -

Tuning the Oxygen Reduction Activity and Stability of Ni(OH)₂@Pt/C Catalysts through Controlling Pt Surface Composition, Strain, and Electronic Structure

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Keywords

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