Ti/IrO2+MnO2电极在酸性溶液中的电化学活性表面积

doi:10.16085/j.issn.1000-6613.2018-2028

化工进展 ›› 2019, Vol. 38 ›› Issue (08): 3782-3787.DOI: 10.16085/j.issn.1000-6613.2018-2028

Ti/IrO₂+MnO₂电极在酸性溶液中的电化学活性表面积

周键^1,²(),关文学^1,²,王三反^1,²,张学敏^1,²

1. 兰州交通大学环境与市政工程学院，甘肃兰州 730070
2. 寒旱地区水资源综合利用教育部工程研究中心，甘肃兰州 730070

收稿日期:2018-10-12 出版日期:2019-08-05 发布日期:2019-08-05
通讯作者: 周键
作者简介:周键（1984—），男，博士，副教授，硕士生导师，研究方向为电化学水处理技术。E-mail：zjwater123@sina.com。
基金资助:
国家自然科学基金(51804150);甘肃省青年科技基金计划(17JR5RA088);国家科技支撑计划(2015BAE04B01)

Electrochemical active surface area of Ti/IrO₂+MnO₂ electrodes in the acid solutions

Jian ZHOU^1,²(),Wenxue GUAN^1,²,Sanfan WANG^1,²,Xueming ZHANG^1,²

1. College of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
2. Ministry of Education Engineering Research Center of Water Resource Comprehensive Utilization in Cold and Arid Regions, Lanzhou 730070, Gansu, China

Received:2018-10-12 Online:2019-08-05 Published:2019-08-05
Contact: Jian ZHOU

摘要/Abstract

摘要：

采用涂覆热分解法制备不同成分的Ti/IrO₂+MnO₂电极，利用恒电位循环伏安法研究Ti/IrO₂-MnO₂电极在硫酸溶液中的电化学表面行为，并用直线外推法定量地评价电极的电化学活性表面积。结果表明，Ti/(0.7)IrO₂+(0.3)MnO₂的伏安电荷达到最高，为电化学活性表面积最大；随着电位扫描速率增大，伏安电流密度不断增加，而伏安电荷容量逐渐减少，直到维持恒定；所有Ti/IrO₂+MnO₂电极的“内部”电化学活性表面积远大于“外部”电化学活性表面积，约为“外部”电化学活性表面积的2倍，说明电极内部存在丰富的多孔结构，真实表面积巨大，因此Ir⁴⁺/Ir³⁺转化反应多发生于内电化学活性表面区域。

关键词: IrO₂+MnO₂, 电化学活性表面, 电化学, 催化, 界面

Abstract:

Ti/IrO₂+MnO₂ coated electrodes with different compositions were prepared by the thermal decomposition method. The electrochemical surface of Ti/IrO₂+MnO₂ electrodes were studied by potentiostatic cyclic voltammetry in sulfuric acid solution, and the electrochemical active surface area of electrodes were evaluated quantitatively by a linear extrapolation. The results show that the voltammetric charge of Ti/(0.7)IrO₂+(0.3)MnO₂ is the highest, along with the largest electrochemical active surface area. With the increase of the potential scanning speed, the voltammetric current density increases continuously, while the voltammetric charge decreases gradually until a constant value is reached. For all the Ti/IrO₂+MnO₂ electrodes, the “inner” electrochemical active surface area is much larger than the “outer” electrochemical active surface area, by about two times. It means that there are a lot of micropores inside the electrodes with a very large real surface area, thus the Ir⁴⁺/Ir³⁺ valence state transition occurs at the ”inner” electrochemical active surface.

Key words: IrO₂+MnO₂, electrochemical active surface, electrochemistry, catalysis, interface

中图分类号:

TQ138

周键,关文学,王三反,张学敏. Ti/IrO₂+MnO₂电极在酸性溶液中的电化学活性表面积[J]. 化工进展, 2019, 38(08): 3782-3787.

Jian ZHOU,Wenxue GUAN,Sanfan WANG,Xueming ZHANG. Electrochemical active surface area of Ti/IrO₂+MnO₂ electrodes in the acid solutions[J]. Chemical Industry and Engineering Progress, 2019, 38(08): 3782-3787.

图/表 7

图1 Ti/(x)IrO2+(1-x)MnO2在0.5mol/L H2SO4溶液的循环伏安曲线

图2 铱锰摩尔比对伏安电荷的影响

图3 不同铱锰摩尔比电极的SEM照片

图4 不同扫描速率下的循环伏安曲线

图5 扫描速率对伏安电荷的影响

图6 伏安电荷与电位扫描速率平方根的关系

图7 Ti/(x)IrO2+(1-x)MnO2的Q total 、Q outer 、Q inner

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Ti/IrO₂+MnO₂电极在酸性溶液中的电化学活性表面积

Electrochemical active surface area of Ti/IrO₂+MnO₂ electrodes in the acid solutions

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