Abstract
The efficiency of the hydrogen evolution reaction (HER) is significantly influenced by the accumulation of the H2 bubbles at the electrode reaction interface. Superhydrophobic/underwater superaerophilic materials can expedite bubble desorption on board. Therefore, in this study, a superaerophilic titanium felt (SALTF) is fabricated and positioned opposite to the working electrode (Pt). The cooperative electrode is referred to as the Pt//SALTF electrode. With adjustable distance between the flat Pt and the SALTF, bubble transfer from the flat Pt to the SALTF can be observed between them. Due to the enhanced bubble escape process, the overpotential for the Pt//SALTF cooperative electrode is reduced by 20 mV at −10 mA cm−2 and reduced by 92 mV at −100 mA cm−2 compared to that of the flat Pt electrode. At an overpotential of −500 mV, the current density for the flat Pt electrode is −146 mA cm−2, which increases to −209 mA cm−2 after assembling the Pt//SALTF. This mode of assembly greatly enhances HER performance through mass transfer enhancement.
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