Superaerophilic/superaerophobic cooperative electrode for efficient hydrogen evolution reaction via enhanced mass transfer

Chunhui Zhang; Zhe Xu; Nana Han; Ye Tian; Tanja Kallio; Cunming Yu; Lei Jiang

doi:10.1126/sciadv.add6978

Superaerophilic/superaerophobic cooperative electrode for efficient hydrogen evolution reaction via enhanced mass transfer

Sci Adv. 2023 Jan 18;9(3):eadd6978. doi: 10.1126/sciadv.add6978. Epub 2023 Jan 18.

Authors

Chunhui Zhang^{1

2

3}, Zhe Xu², Nana Han⁴, Ye Tian¹, Tanja Kallio⁴, Cunming Yu², Lei Jiang^{1

2}

Affiliations

¹ CAS Key Laboratory of Bio-Inspired Materials and Interface Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
² Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China.
³ School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
⁴ Department of Chemistry and Materials Science, School of Chemical Engineering, Aalto University, Aalto FI-00076, Finland.

Abstract

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 overpotential. 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 reducing diffusion distance. Benefiting from the enhanced mass transfer, the overpotential for the SAL/SAB cooperative 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.