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In electrochemical hydrogen evolution reaction (HER), the produced hydrogen gas bubbles often adhered to the electrode surface—and blocked the active catalytic site. While different catalysts were developed to improve the catalytic performance of HER, the design of a durable and universal approach for minimizing the force of nucleated hydrogen gas-bubble adhesion to prevent blockage of electrocatalytic sites because of bubbles-adhesion—is unprecedented. Generally, buoyancy should outweigh the capillary force to remove nucleated bubbles, which means these forces ratio, Eötvös number Eo > 1. Herein, we report a chemically reactive multilayer coating on an electrode to chemically modulate the adhesion force of nucleated gas-bubble on the electrode. A dual modified coating on Ni-foam provided a non-adhesive superaerophobicity with nucleated bubble adhesion force of 4.6 ± 0.3 μN—and displayed superior HER performance with lower overpotential (333 to 250 mV) at 100 mA cm-2 with respect to bare Ni-foam. The chemically-modulated low bubble-adhesion facilitated the early removal of nucleated tiny hydrogen gas bubbles with a minimum size of 0.64 mm and Eo = 0.05 to keep catalytic sites available for superior electrochemical HER. Such a positive impact of the prepared coating was also noted for various other electrodes.

権利情報:

• In Copyright
  

  This is the peer reviewed version of the following article: Modulating Force of Nucleated Hydrogen Bubble Adhesion to Boost Electrochemical Water Splitting, which has been published in final form at https://doi.org/10.1002/adfm.202311648. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

キーワード: superwetting

刊行年月日: 2023-10-24

出版者: Wiley

掲載誌:

• ADVANCED FUNCTIONAL MATERIALS (ISSN: 16163028) vol. 34 issue. 6

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4429

公開URL: https://doi.org/10.1002/adfm.202311648

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更新時刻: 2024-10-24 16:30:28 +0900

MDRでの公開時刻: 2024-10-24 16:30:29 +0900