Regulating Interfacial H2O Activity and H2 Bubbles by Core/Shell Nanoarrays for 800 h Stable Alkaline Seawater Electrolysis,Advanced Materials

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Regulating Interfacial H2O Activity and H2 Bubbles by Core/Shell Nanoarrays for 800 h Stable Alkaline Seawater Electrolysis
Advanced Materials ( IF 27.4 ) Pub Date : 2025-03-24 , DOI: 10.1002/adma.202416658
Xiaodong Yang ₁ , Haochen Shen ₁ , Xiaoming Xiao ₁ , Zhichao Li ₁ , Haiqi Liang ₂ , Shuai Chen ₂ , Yongli Sun ₁ , Bin Jiang ₁ , Guobin Wen ₂ , Shuangyin Wang _{2,

3} , Luhong Zhang ₁

Affiliation

The catalytic activity and stability under high current densities for hydrogen evolution reactions (HER) are impeded by firm adherence and coverage of H2 bubbles to the catalytic sites. Herein, we systematically synthesize core/shell nanoarrays to engineer bubble transport channels, which further remarkably regulate interfacial H2O activity, and swift H2 bubble generation and release. The self‐supported catalyst holds uniform ultra‐low Ru active sites of 0.38 wt% and promotes the rapid formation of plentiful small H2 bubbles, which are rapidly released by the upright channels, mitigating the blockage of active sites and avoiding surface damage from bubble movements. As a result, these core/shell nanoarrays achieve ultralow overpotentials of 18 and 24 mV to reach 10 mA cm−2 for HER in 1 M KOH freshwater and seawater, respectively. Additionally, the assembled electrolyzer demonstrates stable durability over 800 hours with a high current density of 2 A cm−2 in 1 M KOH seawater. The techno‐economic analysis (TEA) indicates that the unit cost of the hydrogen production system is nearly half of the DOE's (Department of Energy) 2026 target. Our work addresses the stability challenges of HER and highlights its potential as a sustainable and economically feasible solution for large‐scale hydrogen production of seawater.

中文翻译：

通过核/壳纳米阵列调节界面 H2O 活性和 H2 气泡进行 800 h 稳定碱性海水电解

析氢反应（HER）在高电流密度下的催化活性和稳定性受到 H2 气泡对催化位点的牢固粘附和覆盖的阻碍。在此，我们系统地合成了核/壳纳米阵列来设计气泡传输通道，进一步显着调节界面 H2O 活性，并迅速产生和释放 H2 气泡。自支撑催化剂保持均匀的 0.38 wt% 的超低 Ru 活性位点，并促进大量小 H2 气泡的快速形成，这些气泡由正直通道迅速释放，减轻活性位点的堵塞并避免气泡运动对表面的破坏。因此，这些核/壳纳米阵列实现了 18 和 24 mV 的超低过电位，在 1 M KOH 淡水和海水中分别达到 10 mA cm-2 的 HER。此外，组装好的电解槽在 1 M KOH 海水中表现出 800 小时的稳定耐用性和 2 A cm-2 的高电流密度。技术经济分析（TEA）表明，制氢系统的单位成本几乎是 DOE（能源部）2026 年目标的一半。我们的工作解决了 HER 的稳定性挑战，并强调了其作为大规模海水制氢的可持续且经济可行的解决方案的潜力。

更新日期：2025-03-24

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