材料科学
润湿
电极
电解
电化学
纳米结构
气泡
电流密度
纳米技术
化学工程
氢
电解水
纳米尺度
接触角
复合材料
电解质
有机化学
化学
物理
物理化学
量子力学
并行计算
计算机科学
工程类
作者
Lukas Krause,Katarzyna Skibińska,Hannes Rox,Robert Baumann,Mateusz Marzec,Xuegeng Yang,Gerd Mutschke,Piotr Żabiński,Andrés Fabián Lasagni,Kerstin Eckert
标识
DOI:10.1021/acsami.2c22231
摘要
Emerging manufacturing technologies make it possible to design the morphology of electrocatalysts on the nanoscale in order to improve their efficiency in electrolysis processes. The current work investigates the effects of electrode-attached hydrogen bubbles on the performance of electrodes depending on their surface morphology and wettability. Ni-based electrocatalysts with hydrophilic and hydrophobic nanostructures are manufactured by electrodeposition, and their surface properties are characterized. Despite a considerably larger electrochemically active surface area, electrochemical analysis reveals that the samples with more pronounced hydrophobic properties perform worse at industrially relevant current densities. High-speed imaging shows significantly larger bubble detachment radii with higher hydrophobicity, meaning that the electrode surface area that is blocked by gas is larger than the area gained by nanostructuring. Furthermore, a slight tendency toward bubble size reduction of 7.5% with an increase in the current density is observed in 1 M KOH.
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