Features of metal surface structuring by high-power femtosecond laser pulses

Yavtushenko, I. O.; Yavtushenko, M. S.; Zolotovskii, I. O.; Novikov, S. G.; Berintsev, A. V.; Kadochkin, A. S.; Stoliarov, Dmitrii; Kostishko, B. B.; Bunakov, N. A.

doi:10.1134/s1063785015080167

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…Among the other fields, surface structuring has benefited greatly from the usage of fs lasers [ 6 ]. Here, it allows one to achieve true hierarchical surface features on a large variety of substrates such as various metals [ 7 ], glasses [ 8 ], or polymers [ 9 ]. Therefore, it comes as no surprise that surfaces made using a fs light source have been tested in a vast array of applications including self-cleaning [ 10 ], anti-icing [ 11 ], anti-fouling [ 12 ], photonics, and bionics [ 13 , 14 ], to name a few.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser-Ablated Copper Surface as a Substrate for a MoS2-Based Hydrogen Evolution Reaction Electrocatalyst

Levinas

Grigucevičienė

Kubilius³

et al. 2022

Materials

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One of the methods to improve the performance of a heterogeneous electrocatalyst is the dispersion of a catalytic material on a suitable substrate. In this study, femtosecond laser ablation was used to prepare very rough but also ordered copper surfaces consisting of vertical, parallel ridges. Then, a molybdenum sulfide coating was electrochemically deposited onto these surfaces. It was observed by profilometry that the average roughness of the surface after coating with MoS2 had decreased, but the developed surface area still remained significantly larger than the projected surface area. The electrodes were then used as an electrocatalyst for the hydrogen evolution reaction in acidic media. These were highly efficient, reaching 10 mA cm−2 of HER current at a −181 mV overpotential and a Tafel slope of ~39 mV dec−1. Additionally, scanning electrochemical microscopy was used to observe whether hydrogen evolution would preferentially occur in certain spots, for example, on the peaks, but the obtained results suggest that the entire surface is active. Finally, the electrochemical impedance spectroscopy data showed the difference in the double-layer capacitance between the ablated and non-ablated surfaces (up to five times larger) as well as the parameters that describe the improved catalytic activity of fs-Cu/MoS2 electrodes.

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