Gas flow stimulated hydrodynamics for preparation and application of platinized titanium hollow fibre electrodes

Ronald P.H. Jong, Guido Mul*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
60 Downloads (Pure)

Abstract

In this study, Pt was electrodeposited on the surface of Ti hollow fibres from PtCl62- solution at fixed potential and at variable gas flow rate. Partial Pt coverage of Ti was obtained at flow rates ≤ 5 mL∙min-1, while a more-even geometrical distribution and linearly increasing Electrochemical Surface Area (ECSA) of Pt was obtained for flow rates of > 5 and < 20 mL∙min-1. Above 20 mL∙min-1, the morphology did not significantly change, and only a limited increase in ECSA of Pt (PtECSA) was obtained. Second, the performance of the Pt functionalized Ti-HFEs was evaluated at fixed potential in i) liquid phase oxidation of FeII to FeIII, and ii) the hydrogen (gas) evolution reaction (HER). Generally, for the oxidation of Fe(CN)64-, a linear increase in current from 3 to ~9 mA was found as a function of increasing gas flow. For the HER, a gas evolving reaction, initially (in the range of 0 – 10 mL.min-1) a much larger enhancement in current (from ~-10 to -35 mA) was observed than consecutively at higher flow rates. The effect of gas flow rate on Pt deposition, and utilization of platinized Ti HFEs, is explained on the basis of increasing fractional participation of relatively small pores at high flow rates, and generally an increasing mass transfer coefficient (kM) associated with localized mixing of the electrolyte near the electrode/electrolyte interface. The kM is roughly in the same order of magnitude as obtained in experiments using rotating disc electrodes.
Original languageEnglish
Article numbere202101135
JournalChemElectroChem
Volume9
Issue number5
Early online date1 Feb 2022
DOIs
Publication statusPublished - 11 Mar 2022

Keywords

  • Electrodeposition
  • holow fiber electrode
  • titanium
  • Mass transfer enhancement
  • Hydrogen evolution
  • electrochemical surface area
  • electrochemical engineering
  • Pore size distribution
  • Pore size
  • UT-Hybrid-D

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