Synergistic Nucleation and Texture Engineering of Cu <sub>2</sub> O Photocathodes for Efficient and Durable Solar Hydrogen Evolution
効率的で耐久性のある太陽水素生成のためのCu2O光電極の相乗的核形成とテクスチャエンジニアリング (AI 翻訳)
Kim DS, Lee KW, Lee HH, Choi JH, Cho SW, Cho HK
🤖 gxceed AI 要約
日本語
本研究では、Auナノ粒子シードとSbドーピングを用いた低温電着法により、垂直配向したCu2O光電極を開発した。この相乗的制御により、緻密な核形成と配向性が促進され、電荷輸送と光捕集が向上した。光電極は0 V vs RHEで8.1 mA cm-2の光電流密度を示し、50時間にわたり初期光電流の97%を維持した。高温度アニールを必要としないこの手法は、酸化物ベースの光電極によるグリーン水素生成の実用的な基盤を提供する。
English
This paper reports a vertically textured Cu2O photocathode fabricated by low-temperature electrodeposition using Au seeding and Sb doping. The synergistic control promotes dense nucleation and preferred orientation, improving charge transport and light harvesting. The photocathode achieves 8.1 mA cm-2 at 0 V vs RHE and retains 97% of its initial photocurrent over 50 hours, providing an energy-efficient route to durable oxide-based photocathodes for solar green hydrogen generation.
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
本研究成果は、日本が推進する水素社会戦略において重要なグリーン水素製造技術の進展に寄与する。低温・省エネルギーのプロセスは、日本のGX(グリーントランスフォーメーション)政策における脱炭素化とエネルギー安全保障の目標に合致する。
In the global GX context
This work advances global efforts in green hydrogen production by demonstrating a scalable, low-temperature method for efficient Cu2O photocathodes. It addresses key challenges in oxide-based photoelectrodes, supporting the transition towards renewable hydrogen as a clean energy carrier.
👥 読者別の含意
🔬研究者:This work provides a novel approach to texturing Cu2O photocathodes, offering insights into charge transport and light management for improved performance.
🏢実務担当者:The low-temperature electrodeposition method presented could be adapted for industrial-scale production of photocathodes for green hydrogen generation.
🏛政策担当者:The results support the viability of oxide-based photoelectrodes for green hydrogen, which could inform policy on renewable hydrogen deployment and R&D funding.
📄 Abstract(原文)
In oxide-based photocathodes, photoelectrochemical hydrogen evolution is fundamentally constrained by the trade-off between sufficient light absorption and efficient minority-electron transport through the absorber. Here, we report a vertically textured Cu<sub>2</sub>O photocathode enabled by low-temperature electrodeposition on an Au nanoparticle-seeded substrate through synergistic dual growth control by Au seeding and Sb doping. Au seeding promotes dense bottom-up nucleation, while Sb incorporation sustains the (111) preferred orientation during growth, producing a compact, vertically aligned polycrystalline Cu<sub>2</sub>O absorber. This crystallographic texturing improves charge transport by lowering bulk and interfacial resistance, while diffuse reflectance analysis reveals suppressed optical loss near the band edge, consistent with more effective light harvesting in the textured absorber. Integrated into a complete FTO/Au seed/Cu<sub>2</sub>O:Sb/ZnO:Al/TiO<sub>2</sub>/Pt architecture, the photocathode delivers 8.1 mA cm<sup>−2</sup> at 0 V versus RHE and retains 97% of its initial photocurrent over 50 h. These results establish an energy-efficient route to high performance Cu<sub>2</sub>O photocathodes without high-temperature post-annealing and provide a practical platform for oxide-based solar green hydrogen generation.
🔗 Provenance — このレコードを発見したソース
- Research Square https://doi.org/10.22541/authorea.15004925/v1first seen 2026-06-20 04:48:34 · last seen 2026-07-02 04:48:37
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