Porosity and thickness effect of Pd-Cu-Si metallic glasses on electrocatalytic hydrogen production and storage


Sarac B., Karazehir T., Yuece E., Muehlbacher M., Sarac A. S., Eckert J.

MATERIALS & DESIGN, vol.210, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 210
  • Publication Date: 2021
  • Doi Number: 10.1016/j.matdes.2021.110099
  • Journal Name: MATERIALS & DESIGN
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, CAB Abstracts, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Veterinary Science Database, Directory of Open Access Journals, Civil Engineering Abstracts
  • Keywords: Metallic glass, Thin film, Hydrogen evolution reaction, Polarization, Hydrogen storage, Electrochemical circuit modeling, HIGHLY EFFICIENT, EVOLUTION REACTION, BEHAVIOR, NANOPARTICLES, INTERFACE, FRAMEWORK, ABSORPTION, ELECTRODES, DESORPTION, NANOSHEETS
  • Istanbul Technical University Affiliated: Yes

Abstract

This contribution places emphasis on tuning pore architecture and film thickness of mesoporous Pd-Cu- Si thin films sputtered on Si/SiO2 substrates for enhanced electrocatalytic and hydrogen sorption/desorp-tion activity and their comparison with the state-of-the-art thin film electrocatalysts. Small Tafel slope of 43 mV dec-1 for 1250 nm thick coating on 2 gm diameter pores with 4.2 gm interspacing electrocatalyst with comparable hydrogen overpotentials to the literature suggests its use for standard fuel cells. The lar-gest hydrogen sorption has been attained for the 250 nm thick electrocatalyst on 5 gm pore diameter with 12 gm interspacing (2189 gC cm-2 per CV cycle), making it possible for rapid storage systems. Moreover, the charge transfer resistance described by an equivalent circuit model has an excellent cor-relation with Tafel slopes. Along with its very low Tafel slope of 42 mV dec-1 10 nm thick electrocatalyst on 2 gm diameter pores with 4.2 gm interspacing has the highest capacitive response of ti 0.001 S sn cm-2 and is promising to be used as a nano-charger and hydrogen sensor. The findings of Si/SiO2 supported mesoporous Pd-based metallic glass (MG) assemblies suggest a similar design applicability for crystalline systems and other MG types. (c) 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).