The effect of SiO2 additives on solid hydroxide ion-conducting polymer electrolytes: a Raman microscopy study

文献信息

发布日期 2018-02-19

DOI 10.1039/C8CP00262B

影响因子 3.676

作者

Jak Li, Keryn Lian

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摘要

The effect of SiO2 additives on the conductivity and longevity of an alkaline tetraethylammonium hydroxide (TEAOH)–poly(acrylamide) (PAM) polymer electrolyte was investigated. Electrochemical impedance spectroscopy (EIS) and Raman microscopy studies were performed for TEAOH–PAM with micro-sized (mSiO2) or nano-sized (nSiO2) additives under highly hydrated and under ambient conditions. At a high relative humidity (RH) of 75%, nSiO2 significantly increased the ionic conductivity of OH−, achieving 25 mS cm−1, while mSiO2 had little influence (10 mS cm−1). Further investigation at lower RH (45%) revealed that dehydration of TEAOH led to crystallization and lower conductivity of the polymer electrolytes. The degree and rate of crystallization in the different systems varied greatly: mSiO2 accelerated the process while nSiO2 delayed it. Using characteristic signatures obtained from Raman microscopy, a correlation between the ionic conductivity and the structural differences among these systems has been established and an explanation for the impact of the SiO2 additives has been proposed.

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来源期刊

Physical Chemistry Chemical Physics

CiteScore: 5.5

自引率: 10.3%

年发文量: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.