Induced Superaerophobicity onto a Non-superaerophobic Catalytic Surface for Enhanced Hydrogen Evolution Reaction

Kamran Akbar, Sajjad Hussain, Linh Truong, Sanjib Baran Roy, Jae Ho Jeon, Sahng Kyoon Jerng, Minsoo Kim, Yeonjin Yi, Jongwan Jung, Seung Hyun Chun

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7 Citations (Scopus)

Abstract

Despite tremendous progress in the development of novel electrocatalysts for hydrogen evolution reaction (HER), the accumulation of hydrogen gas bubbles produced on the catalyst surface has been rather poorly addressed. The bubbles block the surface of the electrode, thus resulting in poor performance even when excellent electrocatalysts are used. In this study, we show that vertically grown graphene nanohills (VGNHs) possess an excellent capability to quickly disengage the produced hydrogen gas bubbles from the electrode surface, and thus exhibit superaerophobic properties. To compensate for the poor electrolytic properties of graphene toward HER, the graphene surface was modified with WS2 nanoparticles to accelerate the water-splitting process by using this hybrid catalyst (VGNHs-WS2). For comparison purposes, WS2 nanoparticles were also deposited on the flat graphene (FG) surface. Because of its superior superaerophobic properties, VGNHs-WS2 outperformed FG-WS2 in terms of both catalytic activity toward the HER and superaerophobicity. Furthermore, VGNHs-WS2 exhibited a low onset potential (36 mV compared to 288 mV for FG-WS2) and long-term stability in the HER over an extended period of 20 h. This study provides an efficient way to utilize highly conductive and superaerophobic VGNHs as support materials for intrinsic semiconductors, such as WS2, to simultaneously achieve superaerophobicity and high catalytic activity.

Original languageEnglish
Pages (from-to)43674-43680
Number of pages7
JournalACS Applied Materials and Interfaces
Volume9
Issue number50
DOIs
Publication statusPublished - 2017 Dec 20

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Akbar, K., Hussain, S., Truong, L., Roy, S. B., Jeon, J. H., Jerng, S. K., Kim, M., Yi, Y., Jung, J., & Chun, S. H. (2017). Induced Superaerophobicity onto a Non-superaerophobic Catalytic Surface for Enhanced Hydrogen Evolution Reaction. ACS Applied Materials and Interfaces, 9(50), 43674-43680. https://doi.org/10.1021/acsami.7b13918