电极/碱性聚电解质界面的微分电容曲线和零电荷电位测定

doi:10.13208/j.electrochem.2303151

电化学（中英文） ›› 2024, Vol. 30 ›› Issue (3): 2303151. doi: 10.13208/j.electrochem.2303151

电极/碱性聚电解质界面的微分电容曲线和零电荷电位测定

刘晨希^a, 邹泽萍^a, 胡梅雪^b, 丁宇^a, 谷宇^a, 刘帅^a, 南文静^a, 马溢昌^a, 陈招斌^a, 詹东平^a, 张秋根^a^,^*(), 庄林^b^,^*(), 颜佳伟^a^,^*(), 毛秉伟^a^,^*()

^a厦门大学化学化工学院，福建厦门 361005
^b武汉大学化学与分子科学学院，湖北武汉 430072

收稿日期:2023-03-15 修回日期:2023-04-25 接受日期:2023-06-02 出版日期:2024-03-28 发布日期:2023-06-08

The Determination of PZC and differential Capacitance Curve of Platinum-Alkaline Polymer Electrolyte Interfaces

Liu Chen-Xi^a, Zou Ze-Ping^a, Hu Mei-Xue^b, Ding Yu^a, Gu Yu^a, Liu Shuai^a, Nan Wen-Jing^a, Ma Yi-Chang^a, Chen Zhao-Bin^a, Zhan Dong-Ping^a, Zhang Qiu-Gen^a^,^*(), Zhuang Lin^b^,^*(), Yan Jia-Wei^a^,^*(), Mao Bing-Wei^a^,^*()

^aCollege of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
^bCollege of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei, China

Received:2023-03-15 Revised:2023-04-25 Accepted:2023-06-02 Published:2024-03-28 Online:2023-06-08
Contact: ^*Qiu-Gen Zhang, Tel: (86-592)2188072, E-mail: qgzhang@xmu.edu.cn;Lin Zhuang, Tel: (86-27)68788793, E-mail: lzhuang@whu.edu.cn;jwyan@xmu.edu.cn;Bing-Wei Mao, Tel: (86-592)2186862, E-mail: bwmao@xmu.edu.cn
About author:First author contact:^#These authors contributed equally to this work.

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摘要/Abstract

摘要：

碱性聚合物电解质作为现代碱性氢氧燃料电池的核心组成部分，其单离子导体的特性使得“电极/碱性聚电解质”界面的性质与“电极/溶液”界面有所不同。本文使用微电极，运用循环伏安、电化学交流阻抗以及浸入法等方法，测定了电极/碱性聚电解质界面的微分电容曲线和零电荷电位。该界面的微分电容曲线呈“U”状，且存在局域极小值，该极小值所对应的电位与浸入法测得的零电荷电位数值一致。单离子导体的特性使得“电极/碱性聚电解质”界面在零电荷电位两侧表现出不同的电化学极化行为。

关键词: 碱性物电解质, 双电层, 微电极, 微分电容曲线, 零电荷电位

Abstract:

Alkaline polymer electrolyte (APE) is the core component of modern alkaline hydrogen and oxygen fuel cells, and its single ion conductor nature makes the "electrode/APE" interfaces different from the conventional "electrode/solution" interfaces in terms of ion distribution, electrical double layer structure and polarization behavior. Due to the complexity of the APE and the associated solid-solid interfaces, fundamental investigations are challenging and deeper understanding of the structures and properties of such interfaces is in the infant stage. In this work, we aim to investigate the double layer structure from the aspects of differential capacitance curve and potential of zero charge (PZC) at the electrode/QAPPT (quaternary ammonia poly(Nmethyl-piperidine-co-p-terphenyl) interface. Cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and microelectrode-based immersion techniques were employed. The differential capacitance curves of Pt/QAPPT interfaces exhibited an asymmetric U-shaped feature with a minimum at the potential which is consistent with the PZTC measured by the immersion method. The capacitance raised less quickly on the negative than the positive sides of the PZTC. These results reflect the characteristics of the single ion conductor and role of alkaline polyelectrolytes in modifying the double layer structure of the electrode/APE interfaces.

Key words: Alkaline polymer electrolyte, Microelectrode, Differential capacitance curve, Potential of zero charge, Double layer structure

刘晨希, 邹泽萍, 胡梅雪, 丁宇, 谷宇, 刘帅, 南文静, 马溢昌, 陈招斌, 詹东平, 张秋根, 庄林, 颜佳伟, 毛秉伟. 电极/碱性聚电解质界面的微分电容曲线和零电荷电位测定[J]. 电化学（中英文）, 2024, 30(3): 2303151.

Liu Chen-Xi, Zou Ze-Ping, Hu Mei-Xue, Ding Yu, Gu Yu, Liu Shuai, Nan Wen-Jing, Ma Yi-Chang, Chen Zhao-Bin, Zhan Dong-Ping, Zhang Qiu-Gen, Zhuang Lin, Yan Jia-Wei, Mao Bing-Wei. The Determination of PZC and differential Capacitance Curve of Platinum-Alkaline Polymer Electrolyte Interfaces[J]. Journal of Electrochemistry, 2024, 30(3): 2303151.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.2303151

https://electrochem.xmu.edu.cn/CN/Y2024/V30/I3/2303151

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参考文献 36

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QAPPT
Ion exchange capacity（IEC）	2.50 ± 0.05 mmol·g^-1
Ionic conductivity	140 ± 10 mS·cm^-1 @80 ℃
Tensile strength	33 ± 3 MPa@R.T.
Thickness	50 μm
Counterpart ion	OH^-

电极/碱性聚电解质界面的微分电容曲线和零电荷电位测定

The Determination of PZC and differential Capacitance Curve of Platinum-Alkaline Polymer Electrolyte Interfaces

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