电解制备二氧化锰强酸性电解液中气体扩散电极的稳定性与失效行为

引用本文: 张慧, 孟惠民. 电解制备二氧化锰强酸性电解液中气体扩散电极的稳定性与失效行为[J]. 物理化学学报, 2013, 29(12): 2558-2564. doi: 10.3866/PKU.WHXB201310211 shu

Citation: ZHANG Hui, MENG Hui-Min. Stability and Failure Behavior of Gas Diffusion Electrodes in Strong Acid Media for Electrolytic Manganese Dioxide[J]. Acta Physico-Chimica Sinica, 2013, 29(12): 2558-2564. doi: 10.3866/PKU.WHXB201310211 shu

电解制备二氧化锰强酸性电解液中气体扩散电极的稳定性与失效行为

张慧 ^1, ,
孟惠民 ^1,2,

基金项目:
国家自然科学基金(51274027)资助项目 (51274027)

摘要:

采用气体扩散电极(GDE)代替传统析氢阴极电解制备二氧化锰(EMD), 重点研究了气体扩散电极在强酸性MnSO₄-H₂SO₄电解液中的稳定性、寿命及失效行为. 结果表明: 气体扩散电极在MnSO₄-H₂SO₄电解液中重现性好、具有一定的稳定性, 寿命可达400 h; 平行实验表明, 阳极沉积一定厚度的EMD是槽电压第一次升高的主要原因; 电流密度为100 A·m^-2时, 气体扩散电极失效前阴极过程的速度由氧的离子化反应和氧的扩散混合控制, 失效后阴极过程由氧去极化和氢去极化共同组成, 主要发生析氢反应; 催化层聚四氟乙烯(PTFE)网络结构的破坏和镍网层的溶解是电极失效的原因之一; Pt 的团聚降低了电极的电催化活性, 是电极失效的主要原因; 阴极失效是槽电压再次升高的主要原因.

关键词:

English

Stability and Failure Behavior of Gas Diffusion Electrodes in Strong Acid Media for Electrolytic Manganese Dioxide

ZHANG Hui ^1, ,
MENG Hui-Min ^1,2,

1.
1 Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, P. R. China;
2 Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, University of Science and Technology Beijing, Beijing 100083, P. R. China
Received Date: 07 June 2013
Available Online: 28 November 2013
Fund Project:
国家自然科学基金(51274027)资助项目

Abstract:

Electrolytic manganese dioxide (EMD) was prepared using a gas diffusion electrode (GDE) instead of a traditional hydrogen evolution cathode. The stability, lifetime, and failure behavior of the GDE were studied in a strongly acidic MnSO₄-H₂SO₄ electrolysis system. The results show that the GDE has od reproducibility and stability, and its lifetime is up to 400 h in a MnSO₄-H₂SO₄ electrolysis system. Parallel experiments indicate that the major reason for the first increase in the anode cell voltage is the deposition on the anode of a certain thickness of EMD. When the current density is 100 A·m^-2, the cathode reaction rate is controlled by a mixture of oxygen ionization and oxygen diffusion before failure of the GDE, and the cathode reaction process consists of two simultaneous reactions after failure of the GDE, i.e., oxygen depolarization and hydrogen depolarization. Hydrogen depolarization is the main controlling process after GDE failure. One of the reasons for electrode failure is destruction of the polytetrafluoroethylene (PTFE) network structure in the catalyst layer and dissolution of the nickel mesh layer. Platinum agglomeration reduces the electrocatalytic activity of the GDE, and this is the main reason for electrode failure. Cathode failure is the main reason for the second increase in the anode cell voltage.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

电解制备二氧化锰强酸性电解液中气体扩散电极的稳定性与失效行为

English

Stability and Failure Behavior of Gas Diffusion Electrodes in Strong Acid Media for Electrolytic Manganese Dioxide

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

电解制备二氧化锰强酸性电解液中气体扩散电极的稳定性与失效行为

English

Stability and Failure Behavior of Gas Diffusion Electrodes in Strong Acid Media for Electrolytic Manganese Dioxide

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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