Enhancing vapor generation at a liquid-solid interface using micro/nanoscale surface structures fabricated by femtosecond laser surface processing

Troy P. Anderson, Chris Wilson, Craig A. Zuhlke, Corey Kruse, George Gogos, Sidy Ndao, Dennis Alexander

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Femtosecond Laser Surface Processing (FLSP) is a versatile technique for the fabrication of a wide variety of micro/nanostructured surfaces with tailored physical and chemical properties. Through control over processing conditions such as laser fluence, incident pulse count, polarization, and incident angle, the size and density of both micrometer and nanometer-scale surface features can be tailored. Furthermore, the composition and pressure of the environment both during and after laser processing have a substantial impact on the final surface chemistry of the target material. FLSP is therefore a powerful tool for optimizing interfacial phenomena such as wetting, wicking, and phasetransitions associated with a vapor/liquid/solid interface. In the present study, we utilize a series of multiscale FLSPgenerated surfaces to improve the efficiency of vapor generation on a structured surface. Specifically, we demonstrate that FLSP of stainless steel 316 electrode surfaces in an alkaline electrolysis cell results in increased efficiency of the water-splitting reaction used to generate hydrogen. The electrodes are fabricated to be superhydrophilic (the contact angle of a water droplet on the surface is less than 5 degrees). The overpotential of the hydrogen evolution reaction (HER) is measured using a 3-electrode configuration with a structured electrode as the working electrode. The enhancement is attributed to several factors including increased surface area, increased wettability, and the impact of micro/nanostructures on the bubble formation and release. Special emphasis is placed on identifying and isolating the relative impacts of the various contributions.

Original languageEnglish (US)
Title of host publicationLaser-Based Micro- and Nanoprocessing IX
EditorsUdo Klotzbach, Kunihiko Washio, Craig B. Arnold
PublisherSPIE
ISBN (Electronic)9781628414417
DOIs
StatePublished - 2015
EventLaser-Based Micro- and Nanoprocessing IX - San Francisco, United States
Duration: Feb 10 2015Feb 12 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9351
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherLaser-Based Micro- and Nanoprocessing IX
CountryUnited States
CitySan Francisco
Period2/10/152/12/15

Keywords

  • Electrolysis
  • Femtosecond Laser surface processing
  • Overvoltage
  • Vapor Generation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Anderson, T. P., Wilson, C., Zuhlke, C. A., Kruse, C., Gogos, G., Ndao, S., & Alexander, D. (2015). Enhancing vapor generation at a liquid-solid interface using micro/nanoscale surface structures fabricated by femtosecond laser surface processing. In U. Klotzbach, K. Washio, & C. B. Arnold (Eds.), Laser-Based Micro- and Nanoprocessing IX [93510D] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9351). SPIE. https://doi.org/10.1117/12.2079828