Ionic Diode Current Rectification in High Salt Media with Sulfonated Poly(oxy-1,4-phenylene-oxy-1,4-phenylenecarbonyl-1,4-phenylene)

IF 3.5 4区化学 Q2 ELECTROCHEMISTRY

ChemElectroChem Pub Date : 2024-09-05 DOI:10.1002/celc.202400411

Chhavi Sharma, Sara E. C. Dale, Klaus Mathwig, Marcel A. G. Zevenbergen, Zhongkai Li, Bhuvanesh E., Kaushik Parida, Yuvraj Singh Negi, Frank Marken

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Abstract

Sulfonated poly(oxy-1,4-phenylene-oxy-1,4-phenylenecarbonyl-1,4-phenylene) also known as SPEEK is a chemically robust cation conductor with good solution processability. A thin film (approx. 0.7 μm) coated asymmetrically over a 10 μm diameter microhole in a Teflon substrate film (5 μm thickness) produces ionic diode effects in aqueous electrolyte media even at high ionic strengths up to 2 M NaCl. The enhancement in the ionic diode performance under high salt conditions is tentatively attributed to a (partial) switch from a concentration polarisation effect (dominant for high diode currents) to interfacial polarisation (dominant at low current; proposed for molecularly rigid ionomers). Ionic strength effects on the diode performance seem relatively low further indicative of a mechanism for the diode effect caused by interfacial polarisation without significant concentration polarisation. Preliminary comparison of diode phenomena in aqueous HCl, LiCl, NaCl, and MgCl₂ reveals cation specific effects due to interaction with the polymer.

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在高盐介质中使用磺化聚（氧-1,4-亚苯基-氧-1,4-亚苯基羰基-1,4-亚苯基）实现离子二极管电流整流

磺化聚（氧-1,4-亚苯基-氧-1,4-亚苯基羰基-1,4-亚苯基）又称 SPEEK，是一种化学性质稳定的阳离子导体，具有良好的溶液加工性。在特氟隆基底薄膜（厚度为 5 μm）上直径为 10 μm 的微孔上不对称地镀上一层薄膜（约 0.7 μm），即使在高达 2 M NaCl 的高离子强度下，也能在水性电解质介质中产生离子二极管效应。在高盐条件下离子二极管性能的增强可初步归因于（部分）从浓度极化效应（在二极管高电流时占主导地位）到界面极化效应（在低电流时占主导地位；建议用于分子刚性离子聚合物）的转换。离子强度对二极管性能的影响似乎相对较小，这进一步表明二极管效应的机制是由界面极化引起的，而没有明显的浓度极化。对盐酸、氯化锂、氯化钠和氯化镁水溶液中的二极管现象进行的初步比较显示，阳离子与聚合物的相互作用产生了特定效应。

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来源期刊

ChemElectroChem ELECTROCHEMISTRY-

CiteScore

7.90

自引率

2.50%

发文量

515

审稿时长

1.2 months

期刊介绍： ChemElectroChem is aimed to become a top-ranking electrochemistry journal for primary research papers and critical secondary information from authors across the world. The journal covers the entire scope of pure and applied electrochemistry, the latter encompassing (among others) energy applications, electrochemistry at interfaces (including surfaces), photoelectrochemistry and bioelectrochemistry.