标题: Surface Evolution of Ni Electrode Under Cathodic Polarization in Acidic Solution

作者: Wei, QY (Wei, Qinyi); Shi, H (Shi, Hao); Tang, MY (Tang, Mengyi); Liu, XL (Liu, Xianglin); Zhu, H (Zhu, Hua); Yin, HY (Yin, Huayi); Du, KF (Du, Kaifa); Wang, DH (Wang, Dihua)

来源出版物: JOURNAL OF THE ELECTROCHEMICAL SOCIETY  卷: 171  期: 5  文献号: 051501  DOI: 10.1149/1945-7111/ad4423  Published Date: 2024 MAY 1  

摘要: The surface morphology and structure of nickel cathode is closely related to its service performance and stability for water electrolysis applications. However, the surface evolution of nickel under cathodic polarization has not been systematically studied. In this work, we investigated the morphology evolution of the Ni electrode under cathodic polarization by altering the current density, temperature and composition of electrolyte. A corrosion rate of less than 0.0054 mm a-1 is observed under cathodic polarization at 0.2 mA cm-2. Uniform corrosion appears at low current density (0.2-2 mA cm-2) while serious pitting at high current density (20-200 mA cm-2). The corrosion preferentially takes place at the surface flaws, scratches and cavities. The cathodic corrosion is due to the uneven distribution of the surface potential between the plane and the depression part of the electrode. The mechanism is further confirmed by finite element simulation. The obtained result may provide reference for the design and application of various Ni-based cathodes.

作者关键词: nickel electrode; electrolysis; cathodic protection; cathodic corrosion; acidic environment

地址: [Wei, Qinyi; Shi, Hao; Tang, Mengyi; Liu, Xianglin; Zhu, Hua; Yin, Huayi; Du, Kaifa; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Wei, Qinyi; Shi, Hao; Tang, Mengyi; Liu, Xianglin; Zhu, Hua; Yin, Huayi; Du, Kaifa; Wang, Dihua] Wuhan Univ, Wuhan 430072, Peoples R China.

[Wang, Dihua] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn Sc, Wuhan 430072, Peoples R China.

通讯作者地址: Du, KF; Wang, DH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

Du, KF; Wang, DH (通讯作者)，Wuhan Univ, Wuhan 430072, Peoples R China.

Wang, DH (通讯作者)，Wuhan Univ, State Key Lab Water Resources & Hydropower Engn Sc, Wuhan 430072, Peoples R China.

电子邮件地址: dukf@whu.edu.cn; wangdh@whu.edu.cn

影响因子：3.9