Electrocatalytic hydrogen evolution and in-situ observation of hydrogen microbubbles evolution on stainless steel meshes with various mesh numbers

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2024-11-14 DOI:10.1016/j.ijhydene.2024.11.080

Shujuan Liu , Ruize Gu , Xiaomeng Diao , Dandan Liang , Weihua He

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Abstract

Stainless steel mesh (SSM) is a cost-effective, readily available catalyst and conductive substrate for large-scale hydrogen production in microbial electrolysis cells (MEC). This study reveals that variations in wire diameter and aperture size of SSM affect both the electroactive area for hydrogen evolution reaction (HER) and the formation and diffusion of hydrogen micro-nano bubbles, impacting MEC performance. In-situ hydrogen microbubble observation shows that 60-mesh SSM provides optimal hydrogen evolution due to its large electrochemical active area and many nucleation sites, minimizing the “bubble shielding effect”. The SSM-60 MEC achieves the highest hydrogen recovery (75 ± 5.1%) and energy recovery efficiency (85 ± 6.2%). This study combines electroactivity testing with microscopic in-situ reaction observation to provide a novel strategy for understanding efficient hydrogen evolution catalysts.

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电催化氢气进化以及原位观测不同网目数不锈钢网上氢气微气泡的进化情况

不锈钢网（SSM）是微生物电解池（MEC）中用于大规模制氢的一种具有成本效益、易于获得的催化剂和导电基质。本研究揭示了 SSM 的线径和孔径大小的变化会影响氢进化反应（HER）的电活性面积以及氢微纳气泡的形成和扩散，从而影响 MEC 的性能。原位氢气微气泡观测表明，60 目 SSM 具有较大的电化学活性面积和较多的成核点，最大程度地减少了 "气泡屏蔽效应"，因此能提供最佳的氢气进化效果。SSM-60 MEC 实现了最高的氢回收率（75 ± 5.1%）和能量回收效率（85 ± 6.2%）。这项研究将电活性测试与微观原位反应观察相结合，为了解高效氢进化催化剂提供了一种新策略。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.