Ni electrodes with 3D-ordered surface structures for boosting bubble releasing toward high current density alkaline water splitting

Ma, Jugang; Yang, Menglu; Zhao, Guanlei; Li, Yangyang; Liu, Biao; Dang, Jian; Gu, Jifa; Hu, Song; Yang, Fuyuan; Ouyang, Minggao

doi:10.1016/j.ultsonch.2023.106398

Cited by 7 publications

(2 citation statements)

References 51 publications

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“…16 It has been reported that AWE accounts for 85% of the global electrolysis production capacity in 2020. 17 Nevertheless, commercial AWE operates at a relatively low current density (<400 mA/cm 2 ) and low voltage efficiency (<80%). 18 Increasing the efficiency of AWE has been one of the main challenges in the field of water electrolysis.…”

Section: Introductionmentioning

confidence: 99%

“…Water electrolysis, coupled with renewable energy sources, can produce green hydrogen and hence has attracted considerable attention. − Alkaline water electrolysis (AWE), proton exchange membrane electrolysis cells (PEMECs), and solid oxide electrolysis cells (SOECs) are the three main water electrolysis technologies. − Compared with PEMECs and SOECs, AWE has high technology maturity and requires low investment cost and hence has been commercialized at the megawatt level . It has been reported that AWE accounts for 85% of the global electrolysis production capacity in 2020 . Nevertheless, commercial AWE operates at a relatively low current density (<400 mA/cm 2 ) and low voltage efficiency (<80%) .…”

Section: Introductionmentioning

confidence: 99%

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Bubbles in Porous Electrodes for Alkaline Water Electrolysis

Wu,

Hu,

Zhang

et al. 2023

Langmuir

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Porous electrodes with high specific surface areas have been commonly employed for alkaline water electrolysis. The gas bubbles generated in electrodes due to water electrolysis, however, can screen the reaction sites and hinder reactant transport, thereby deteriorating the performance of electrodes. Hence, an indepth understanding of the behavior of bubbles in porous electrodes is of great importance. Nevertheless, since porous electrodes are opaque, direct observation of bubbles therein is still a challenge. In this work, we have successfully captured the behavior of bubbles in the pores at the side surfaces of nickel-based porous electrodes. Two types of porous electrodes are employed: the ones with straight pores along the gravitational direction and the ones with tortuous pores. In the porous electrodes with tortuous pores, the moving bubbles are prone to collide with the solid matrix, thereby leading to the accumulation of bubbles in the pores and hence bubble trapping. By contrast, in the porous electrodes with straight pores, bubbles are seldom trapped; and when two bubbles near the wall surfaces coalesce, the merged bubble can jump away from the wall surfaces, releasing more active surfaces for reaction. As a result, the porous electrodes with straight pores, although with lower specific surface areas, are superior to those with tortuous pores. The relationship among the pore structures of porous electrodes, bubble behavior, and electrode performance disclosed in this work provides deep insights into the design of porous electrodes.

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Section: Introductionmentioning

confidence: 99%