Remarkable gas bubble transport driven by capillary pressure in 3D printing-enabled anisotropic structures for efficient hydrogen evolution electrocatalysts

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Article number121995
Journal / PublicationApplied Catalysis B: Environmental
Volume320
Online published16 Sept 2022
Publication statusPublished - Jan 2023

Abstract

Additive manufacturing technologies have been proved as a promising method to achieve electrocatalysts with periodic micro-size pores, while the nano-sized interspace of the material structures and their corresponding gas bubbles transfer process are not explored in detail. Herein, we employ the shear force alignment in additive manufacturing to design NiMo-based structures with anisotropic porous channels as electrocatalysts for hydrogen evolution reaction (HER) in seawater. Based on the complementary experimental and theoretical investigation, the unique anisotropic structure not only fully exposes the active sites in the electrolyte, but also facilitates the rapid electrolyte-hydrogen phase conversion during electrochemical reactions. In this case, the obtained 3D electrode exhibits superior electrocatalytic performance and excellent long-term operational stability with an extremely low overpotential of ∼150 mV at a current density of 500 mA/cm2 in 1 M KOH seawater. This work will provide a practical scenario for designing highly-efficient HER electrocatalysts.

Research Area(s)

  • Additive manufacturing, Anisotropic structures, Capillary pressure, Gas bubble transport, Hydrogen evolution reaction

Citation Format(s)

Remarkable gas bubble transport driven by capillary pressure in 3D printing-enabled anisotropic structures for efficient hydrogen evolution electrocatalysts. / Bu, Xiuming; Mao, Zhengyi; Bu, Yu et al.
In: Applied Catalysis B: Environmental, Vol. 320, 121995, 01.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review