Journal
SCIENCE ADVANCES
Volume 9, Issue 3, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.add6978
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We report a cooperative electrode with superaerophilic/superaerophobic properties, which efficiently promotes bubble transfer and accelerates H2 diffusion, leading to improved hydrogen evolution reaction (HER) efficiency. This cooperative strategy shows great potential for various gas-involved processes.
Hydrogen evolution reaction (HER), as an effective method to produce green hydrogen, is greatly impeded by inefficient mass transfer, i.e., bubble adhesion on electrode, bubble dispersion in the vicinity of electrode, and poor dissolved H2 diffusion, which results in blocked electrocatalytic area and large H2 concentration overpo-tential. Here, we report a superaerophilic/superaerophobic (SAL/SAB) cooperative electrode to efficiently promote bubble transfer by asymmetric Laplace pressure and accelerate dissolved H2 diffusion through reduc-ing diffusion distance. Benefiting from the enhanced mass transfer, the overpotential for the SAL/SAB cooper-ative electrode at -10 mA cm-2 is only -19 mV, compared to -61 mV on the flat Pt electrode. By optimizing H2SO4 concentration, the SAL/SAB cooperative electrode can achieve ultrahigh current density (-1867 mA cm-2) at an overpotential of -500 mV. We can envision that the SAL/SAB cooperative strategy is an effective method to improve HER efficiency and stimulate the understanding of various gas-involved processes.
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