CAS Key Laboratory of Bio-Inspired Materials and Interface Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China.
Sci Adv. 2023 Jan 18;9(3):eadd6978. doi: 10.1126/sciadv.add6978.
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 H diffusion, which results in blocked electrocatalytic area and large H concentration overpotential. Here, we report a superaerophilic/superaerophobic (SAL/SAB) cooperative electrode to efficiently promote bubble transfer by asymmetric Laplace pressure and accelerate dissolved H diffusion through reducing diffusion distance. Benefiting from the enhanced mass transfer, the overpotential for the SAL/SAB cooperative electrode at -10 mA cm is only -19 mV, compared to -61 mV on the flat Pt electrode. By optimizing HSO concentration, the SAL/SAB cooperative electrode can achieve ultrahigh current density (-1867 mA cm) 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.
析氢反应（HER）作为一种绿色制氢的有效方法，受到传质效率低的极大阻碍，即电极上的气泡附着、电极附近的气泡分散和较差的溶解 H 扩散，这导致了催化面积的堵塞和较大的 H 浓度过电势。在这里，我们报道了一种超亲气/超疏气（SAL/SAB）协同电极，通过不对称拉普拉斯压力有效地促进气泡传递，并通过缩短扩散距离来加速溶解 H 的扩散。得益于增强的传质，在 -10 mA cm 的 SAL/SAB 协同电极上的过电势仅为 -19 mV，而在平坦的 Pt 电极上则为 -61 mV。通过优化 HSO 浓度，SAL/SAB 协同电极可以在 -500 mV 的过电势下实现超高电流密度（-1867 mA cm）。我们可以设想，SAL/SAB 协同策略是提高 HER 效率和激发对各种涉及气体的过程的理解的有效方法。
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