Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/11986
Title: CVD-Deposited oxygen-selective fluorinated siloxane copolymers as gas diffusion layers
Authors: Cihanoğlu, Gizem
Ebil, Özgenç
Izmir Institute of Technology
Izmir Institute of Technology
Keywords: Diffusion
Copolymers
Oxygen
Batteries
Permeability
Issue Date: 4-Feb-2022
Publisher: American Chemical Society
Abstract: Copolymer thin films of 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane (V4D4), 2-(perfluorohexylethylacrylate) (PFHEA), and 2-(perfluoroalkylethylmethacrylate) (PFEMA) were synthesized via initiated chemical vapor deposition (iCVD) as potential candidates for gas diffusion layers (GDLs) in gas diffusion electrodes (GDEs) for aqueous metal–air batteries. Thin-film GDLs exhibited an average water vapor transmission rate of 7.5 g m–2 day–1 and enhanced oxygen diffusion with oxygen permeabilities as high as 3.53 × 10–15 mol m m–2 s–1 Pa–1 (10.5 Barrer). The electrochemical performance of GDEs fabricated using commercial catalysts, current collectors, and synthesized GDLs was investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and potentiodynamic polarization measurements. The fabricated GDEs exhibited higher oxygen reduction current densities (228.2 mA cm–2) compared to commercial GDEs (132.7 mA cm–2). Copolymer GLDs exhibited an order of magnitude higher oxygen diffusion (39.5 × 10–8 cm2 s–1) in GDEs compared to commercial counterparts (1.84 × 10–8 cm2 s–1). Due to the high oxygen solubility of V4D4 and excellent hydrophobic behavior of PFHEA and PFEMA, their copolymers can effectively promote the diffusion of oxygen and restrict moisture intake, making them ideal materials for GDLs. Combining well-balanced properties of siloxane and fluorinated polymer chemistries, the iCVD process is an excellent low-cost method for the fabrication of GDLs for metal–air battery applications.
URI: https://hdl.handle.net/11147/11986
https://doi.org/10.1021/acs.iecr.1c04244
Appears in Collections:Chemical Engineering / Kimya Mühendisliği

Files in This Item:
File Description SizeFormat 
11986.pdfMakale Dosyası2.01 MBAdobe PDFView/Open
Show full item record

CORE Recommender

WEB OF SCIENCETM
Citations

1
checked on Nov 26, 2022

Page view(s)

30,726
checked on Nov 28, 2022

Download(s)

114
checked on Nov 28, 2022

Google ScholarTM

Check

Altmetric


Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.