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arXiv · 2406.14079

Nano-Patterned Pt-Based Metallic Glass Electrocatalysts with In-Situ Copper Oxide Foam for Enhanced Hydrogen Evolution

Fei-Fan Cai·Baran Sarac·Adnan Akman·Juan J. Londoño·Selin Gümrükcü·Lukas Schweiger·Martin Hantusch·Jan Schroers·Andreas Blatter·Annett Gebert·Florian Spieckermann·Jürgen Eckert
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Abstract

Hydrogen is a promising energy carrier for replacing fossil fuels, and hydrogen production via hydrogen evolution reaction (HER) is an environmentally friendly option if electrocatalysts with low overpotentials and long-term stability are used. In this work, the electrocatalytic performance of $\mathrm{Pt_{57.5}Cu_{14.7}Ni_{5.3}P_{22.5}}$ bulk metallic glass (BMG) with flat, micro-patterned, and nano-patterned surfaces for HER in 0.5 M H2SO4 is studied. The nano-patterned Pt-BMG demonstrates outstanding long-term stability and self-improving behavior with a final overpotential of 150 mV and a Tafel slope of 42 $\mathrm{mV dec^{-1}}$ after 1000 linear sweep voltammetry (LSV) cycles, which is respectively 42% and 37% lower than in the first LSV cycle. X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) indicate the formation of a layer of CuO/Cu2O foam deposited on top of the nano-patterned surface during the stability test of 1000 LSV cycles. A three-step process is proposed to explain the formation of CuxO foam via dynamic hydrogen bubble templating (DHBT) electrodeposition from Cu dissolution of the Pt-BMG without using copper salt. This work provides a method to create CuxO foams that could be used for various applications. Moreover, nano-patterned BMGs with DHBT deposition offer a feasible strategy to synthesize metal or metal-oxide foams.

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BibTeXRIS

Fei-Fan Cai, Baran Sarac, Adnan Akman, Juan J. Londoño, Selin Gümrükcü, Lukas Schweiger, Martin Hantusch, Jan Schroers, Andreas Blatter, Annett Gebert, Florian Spieckermann, Jürgen Eckert. 2024-06-20. Nano-Patterned Pt-Based Metallic Glass Electrocatalysts with In-Situ Copper Oxide Foam for Enhanced Hydrogen Evolution. https://doi.org/10.1016/j.matdes.2024.113530

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