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Mechanism of Corrosion and Sedimentation of Nickel Electrodes for Alkaline Water Electrolysis by Taikai Liu; Xianbin Wang; Xinge Jiang; Chunming Deng; Shaopeng Niu; Jie Mao; Wei Zeng; Min Liu; Hanlin Liao is a Materials Science article available to read on EtoBox.

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Nickle is one of the most promising alternatives to noble-metal catalysts in alkaline water electrolysis (AWE). Although Ni exhibits superior stability in alkaline solution, the sediments which have been observed in some situations result in a limited electrolytic efficiency of Ni electrodes. This work was proposed to elucidate the sedimentation mechanism of Ni electrodes via a long-term test in KOH solution. Electrochemical tests and localized electrochemical tests were applied to assess the corrosion behavior of Ni electrodes. The micromorphology and grain orientations of electrodes were investigated by SEM, EDS, EBSD and XPS. The tested anode was found apparently roughened, leaving veinlet-like corrosion textures on the surface, meanwhile pits in several micrometers were found. The collected sediments were composed of elements such as Pb, Sn, Ni, K, O and C. The polarization impedance of the tested anode was 0.4 Ω cm2, which is far lower than that of the as-prepared anode, 56 Ω cm2. In alkaline solution, the galvanic cells formed since the tested anode was found with a positive potential (+13.8 μV) and a negative potential (−7.8 μV) and caused local corrosion. Galvanic corrosion

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Author

Taikai Liu; Xianbin Wang; Xinge Jiang; Chunming Deng; Shaopeng Niu; Jie Mao; Wei Zeng; Min Liu; Hanlin Liao

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)