Residual porosity of 3D-LAM-printed stainless-steel electrodes allows galvanic exchange platinisation

James Weber; Andrew J. Wain; Heidi Piili; Ville Pekka Matilainen; Anne Vuorema; Gary A. Attard; Frank Marken

doi:10.1002/celc.201600098

Residual porosity of 3D-LAM-printed stainless-steel electrodes allows galvanic exchange platinisation

James Weber, Andrew J. Wain, Heidi Piili, Ville Pekka Matilainen, Anne Vuorema, Gary A. Attard, Frank Marken

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Abstract

Stainless-steel rods were manufactured by laser additive manufacturing (LAM or "3D-printing") from a stainless-steel (316L) powder precursor, and then investigated and compared to conventional stainless steel in electrochemical experiments. The LAM method used in this study was based on "powder bed fusion", in which particles with an average diameter of 20-40μm are fused to give stainless-steel rods of 3mm diameter. In contrast to conventional bulk stainless-steel (316L) electrodes, for 3D-printed electrodes, small crevices in the surface provide residual porosity. Voltammetric features observed for the 3D-printed electrodes immersed in aqueous phosphate buffer are consistent with those for conventional bulk stainless steel (316L). Two chemically reversible surface processes were observed and tentatively attributed to Fe(II/III) phosphate and Cr(II/III) phosphate. Galvanic exchange is shown to allow improved platinum growth/adhesion onto the slightly porous 3D-printed stainless-steel surface, resulting in a mechanically robust and highly active porous platinum deposit with good catalytic activity toward methanol oxidation.

Original language	English
Pages (from-to)	1020-1025
Journal	ChemElectroChem
Volume	3
Issue number	6
Early online date	6 Apr 2016
DOIs	https://doi.org/10.1002/celc.201600098
Publication status	Published - 27 Apr 2016

Keywords

3D printing
Additive manufacturing
Fuel cells
Powder bed fusion
Stainless steel

ASJC Scopus subject areas

Electrochemistry
Catalysis

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10.1002/celc.201600098

3Dsteel_2015_1h1_revision_nh
This is the peer reviewed version of the following article: Weber, J. Wain, A. J. Piili, H. Matilainen, V-P. Vuorema, A. Attard, G. A. Marken, F. (2016) Residual Porosity of 3D‐LAM‐Printed Stainless‐Steel Electrodes Allows Galvanic Exchange Platinisation*. ChemElectroChem, which has been published in final form at https://doi.org/10.1002/celc.201600098. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Accepted author manuscript, 1.8 MB

http://dx.doi.org/10.1002/celc.201600098

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AU - Attard, Gary A.

AU - Marken, Frank

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Residual porosity of 3D-LAM-printed stainless-steel electrodes allows galvanic exchange platinisation

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