A restricted dynamic surface self-reconstruction toward high-performance of direct seawater oxidation

IF 14.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Nature Communications Pub Date : 2024-03-20 DOI:10.1038/s41467-024-46708-8

Ling Zhou, Daying Guo, Lianhui Wu, Zhixi Guan, Chao Zou, Huile Jin, Guoyong Fang, Xi’an Chen, Shun Wang

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Abstract

The development of highly efficient electrocatalysts for direct seawater splitting with bifunctionality for inhibiting anodic oxidation reconstruction and selective oxygen evolution reactions is a major challenge. Herein, we report a direct seawater oxidation electrocatalyst that achieves long-term stability for more than 1000 h at 600 mA/cm²@η₆₀₀ and high selectivity (Faraday efficiency of 100%). This catalyst revolves an amorphous molybdenum oxide layer constructed on the beaded-like cobalt oxide interface by atomic layer deposition technology. As demonstrated, a new restricted dynamic surface self-reconstruction mechanism is induced by the formation a stable reconstructed Co-Mo double hydroxide phase interface layer. The device assembled into a two-electrode flow cell for direct overall seawater electrolysis maintained at 1 A/cm²@1.93 V for 500 h with Faraday efficiency higher than 95%. Hydrogen generation rate reaches 419.4 mL/cm²/h, and the power consumption (4.62 KWh/m³ H₂) is lower than that of pure water (5.0 KWh/m³ H₂) at industrial current density.

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实现高性能海水直接氧化的受限动态表面自我重构

开发具有抑制阳极氧化重构和选择性氧进化反应双重功能的高效海水直接分馏电催化剂是一项重大挑战。在此，我们报告了一种海水直接氧化电催化剂，该催化剂在 600 mA/cm2@η600 电流条件下可实现 1000 小时以上的长期稳定性和高选择性（法拉第效率为 100%）。这种催化剂通过原子层沉积技术在珠状氧化钴界面上构建了无定形氧化钼层。正如所展示的那样，通过形成稳定的重构钴钼双氢氧化物相界面层，诱导了一种新的受限动态表面自重构机制。该装置被组装成一个双电极流动池，用于直接整体电解海水，在 1 A/cm2@1.93 V 的电压下维持 500 小时，法拉第效率高于 95%。氢气生成率达到 419.4 mL/cm2/h，在工业电流密度下，耗电量（4.62 KWh/m3 H2）低于纯水（5.0 KWh/m3 H2）。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.