Bulk nanoporous platinum for electrochemical actuation

Haonan Sun; Yizhou Huang; Shan Shi

doi:10.26599/EMD.2023.9370006

Energy Materials and Devices 2023, 1(1): 9370006 https://doi.org/10.26599/EMD.2023.9370006

Research Article |

Open Access | Issue | Published: 17 October 2023

Bulk nanoporous platinum for electrochemical actuation

Show Author's Information Hide Author's Information Haonan Sun^¹, Yizhou Huang^¹, Shan Shi^{¹^,²}(

)

1Research Group of Integrated Metallic Nanomaterials Systems, Hamburg University of Technology, Hamburg, Germany

2Institute of Materials Mechanics, Helmholtz-Zentrum Hereon, Geesthacht, Germany

Keywords:

dealloying, actuators, nanoporous platinum, electrochemical active surface area

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Sun H, Huang Y, Shi S. Bulk nanoporous platinum for electrochemical actuation. Energy Materials and Devices, 2023, 1(1): 9370006. https://doi.org/10.26599/EMD.2023.9370006

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Abstract

Bulk nanoporous platinum (np-Pt) samples with a remarkably fine ligament size down to 2 nm and good mechanical robustness were fabricated for the first time by electrochemically dealloying Pt₁₅Cu₈₅ master alloy in 1 mol L⁻¹ H₂SO₄ at 60 ℃. The as-prepared np-Pt shows an electrochemically active specific surface area as high as 25 m²/g due to the ultrafine nanostructure. The active surface area remains almost invariable even after 15% macroscopic compressive strain. Furthermore, np-Pt shows considerably high thermal stability due to the low surface diffusivity of Pt. Np-Pt is a promising surface- or interface-controlled functional material, particularly when excellent electrochemical and mechanical performance are necessary due to its high surface-to-volume ratio and mechanical robustness. This work demonstrated the potential application of np-Pt as an electrochemical actuation material. In-situ dilatometry experiments revealed that the surface adsorption–desorption of OH species on np-Pt causes significant strain variations. The proposed np-Pt electrochemical actuator shows an operating voltage down to 1.0 V, a large reversible strain amplitude of 0.37%, and a strain energy density of 1.64 MJ/m³.

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Bulk nanoporous platinum for electrochemical actuation

Show Author's information Hide Author's Information Haonan Sun^¹, Yizhou Huang^¹, Shan Shi^{¹^,²}(

)

1Research Group of Integrated Metallic Nanomaterials Systems, Hamburg University of Technology, Hamburg, Germany

2Institute of Materials Mechanics, Helmholtz-Zentrum Hereon, Geesthacht, Germany

Abstract

Keywords: dealloying, actuators, nanoporous platinum, electrochemical active surface area

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Publication history

Received: 27 August 2023

Revised: 25 September 2023

Accepted: 26 September 2023

Published: 17 October 2023

Issue date: October 2023

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Acknowledgements

We thank Prof. Jiuhui Han from Tianjin University of Technology for his assistance with TEM measurements.

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