Redox-Functional NiFeV/Ni3Fe Bilayer Electrodes to Achieve High Energy-Efficient Alkaline Water Electrolysis at 1000 mA/cm2 under Ambient Conditions.
周囲条件下で1000 mA/cm2の高エネルギー効率アルカリ水電解を実現するレドックス機能性NiFeV/Ni3Fe二層電極 (AI 翻訳)
Q. Ha, Chen-Hao Yeh, Dong‐Hau Kuo
🤖 gxceed AI 要約
日本語
再生可能エネルギー由来の水電解によるグリーン水素製造は、持続可能な代替燃料として重要である。本研究では、NiFeV/Ni3Fe二層触媒を開発し、室温において500および1000 mA/cm2でそれぞれ72.1%および70%のエネルギー効率を達成した。このセルは1000 mA/cm2で1.8 Vの低電位で動作し、エネルギー消費量は4.264 kWh/Nm3となり、IRENAの2050年目標に近づいた。in situラマン分光により、OER中にγ/β-FeOOHが活性中間体として生成することを明らかにした。
English
This study develops a redox-functional NiFeV/Ni3Fe bilayer catalyst for alkaline water electrolysis, achieving energy efficiencies of 72.1% and 70% at 500 and 1000 mA/cm2, respectively, at room temperature. The cell operates at 1.8 V at 1000 mA/cm2, with energy consumption of 4.264 kWh/Nm3, approaching the IRENA target of 42 kWh/kg·H2 by 2050. In situ Raman spectroscopy reveals the formation of γ/β-FeOOH as the active intermediate during OER.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本は水素社会の実現を推進しており、グリーン水素のコスト低減が重要課題である。本研究成果は、高電流密度下での高効率電解を実現する触媒設計を示し、日本の水素製造技術の競争力向上に寄与する可能性がある。
In the global GX context
Green hydrogen is critical for global decarbonization, but cost reduction remains a key challenge. This paper presents a catalyst design achieving high efficiency at industrially relevant current densities, bringing electrolysis closer to economic viability and supporting global hydrogen adoption.
👥 読者別の含意
🔬研究者:The mechanistic insights into the active phases during OER and the bilayer design strategy offer a new pathway for developing high-performance catalysts.
🏢実務担当者:The demonstrated performance at high current densities with low energy consumption suggests potential for scaling up in commercial electrolyzers, though long-term stability should be evaluated.
📄 Abstract（原文）
Water electrolysis powered by renewable energy is crucial for producing green hydrogen, offering a sustainable alternative to fossil fuels. However, production costs must be significantly reduced to compete with hydrogen derived from fossil fuels. Despite decades of research in electrocatalyst development, advancements at the laboratory scale, such as catalyst design and mechanistic insights, have yet to address the critical challenge of developing catalysts that combine high stability with the required performance at high current densities for practical applications. Developing an electrolyzer capable of delivering high energy efficiency at room temperature (RT) is essential for reducing operational costs and prolonging the lifetime of the green hydrogen system. Our redox-functional NiFeV/Ni3Fe bilayer catalyst is designed to meet the targets set by IRENA for energy efficiency, energy consumption, and hydrogen production cost. The NiFeV/Ni3Fe electrolyzer shows significant promise, achieving energy efficiencies of 72.1% and 70% at 500 and 1000 mA/cm2, respectively, at room temperature. The cell operates at a low potential of 1.8 V at 1000 mA/cm2, resulting in an energy consumption of 4.264 kWh/Nm3 or 47.4 kWh/kg·H2, approaching the IRENA target of 42 kWh/kg·H2 by 2050. In situ Raman spectroscopy was conducted to gain deeper insights into the active phases during OER. The NiFeV/Ni3Fe undergoes reconstruction, during which γ-NiOOH initially forms at low anodic bias. As the potential increases, γ-NiOOH transitions to β-NiOOH, followed by the further formation of γ/β-FeOOH, which serves as the active intermediate species to drive OER.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.1021/acsami.5c22833first seen 2026-05-15 20:35:55
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