期刊
POLYMERS
卷 14, 期 18, 页码 -出版社
MDPI
DOI: 10.3390/polym14183718
关键词
proton exchange membrane; electrostatic force microscopy; numerical approximation model; proton conductivity; proton transport mechanism; ionic channel distribution
资金
- technology transfer and commercialization Program through INNOPOLIS Foundation - Ministry of Science and ICT [1711149759]
- Ministry of Small and Medium-sized Enterprises(SMEs) and Startups(MSS), Korea [S3265148]
- Korea Technology & Information Promotion Agency for SMEs (TIPA) [S3265148] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study used electrostatic force microscopy (EFM) to investigate the impact of ionic channel distribution on the proton conductivity of Nafion-sulfonated silica (SSA) composite membranes. The results showed that Nafion-SSA had twice the average local ionic channel density compared to pristine Nafion, and the distribution of the ionic channel density was non-uniform. Additionally, local agglomerations were observed in approximately 10% of the scanned area, attributed to the presence of SSA. These findings are significant for the quantitative assessment of proton exchange membranes (PEMs).
It is important to characterize the proton transport mechanisms of proton exchange membranes (PEMs). Electrostatic force microscopy (EFM) is used to characterize the ionic structures of membranes. In this study, we attempted to quantitatively analyze the proton conductivity enhancement of Nafion-sulfonated silica (SSA) composite membranes with variations in the ionic channel distribution. This study involved several steps. The morphology and surface charge distribution of both membranes were measured using EFM. The measured data were analyzed using a numerical approximation model (NAM) that was capable of providing the magnitude and classification of the surface charges. There were several findings of ionic channel distribution variations in Nafion-SSA. First, the mean local ionic channel density of Nafion-SSA was twice as large as that of the pristine Nafion. The local ionic channel density was non-uniform and the distribution of the ionic channel density of Nafion-SSA was 23.5 times larger than that of pristine Nafion. Second, local agglomerations due to SSA were presumed by using the NAM, appearing in approximately 10% of the scanned area. These findings are meaningful in characterizing the proton conductivity of PEMs and imply that the NAM is a suitable tool for the quantitative assessment of PEMs.
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