Tian, Pengfei; Zong, Wei; Xiong, Jin; Liu, Wei; Liu, Jingquan; Dai, Yuhang; Zhu, Jiexin; ... Han, Ning; + view all Tian, Pengfei; Zong, Wei; Xiong, Jin; Liu, Wei; Liu, Jingquan; Dai, Yuhang; Zhu, Jiexin; Song, Shiwei; Chu, Kaibin; He, Guanjie; Han, Ning; - view fewer (2025) Dynamic Reconstruction of Crystal/Amorphous Hetero-Phosphate Janus Interfaces for Highly Stable Seawater Splitting. Advanced Functional Materials , Article 2504862. 10.1002/adfm.202504862. (In press).

Text He_Dynamic Reconstruction of CrystalAmorphous Hetero-Phosphate Janus Interfaces for Highly Stable Seawater Splitting.pdf Access restricted to UCL open access staff until 6 May 2026. Download (1MB)

Abstract

The abundant seawater resources provide favorable advantages for the large-scale application of seawater electrolysis to produce hydrogen. However, the catalysts are prone to triggering the chlorine evolution reaction (CER) and are easily corroded by Cl−, which are key challenges that need urgent resolution in seawater electrolysis technology. Here, a crystal/amorphous heterostructure bifunctional composite catalyst (caMo-NiFePO/NMF) for seawater splitting is synthesized through in situ etching and phosphorylation. The incorporation of Mo facilitates the formation of crystalline-amorphous interfaces and adjusts the Fe electronic states and d-band centers, thereby boosting the adsorption capacity of *OOH intermediates and the repulsion of Cl−, forming a dynamic *OOH-rich, Cl−-poor Janus interface. This enhances catalytic activity and prevents catalyst deep reconstruction toward hydroxyl metal oxide, leading to highly stable and effective seawater splitting. Noteworthy, the caMo-NiFePO/NMF requires a low overpotential of 328 mV to reach 500 mA cm−2 in alkaline seawater for oxygen evolution reaction (OER), avoiding triggering CER. It also shows excellent activity with 327 mV to 500 mA cm⁻² in alkaline seawater for hydrogen evolution reaction (HER). As a bifunctional catalyst, caMo-NiFePO/NMF demonstrates excellent performance with a cell potential of 1.7 V to achieve 100 mA cm⁻² in alkaline seawater, maintaining remarkable stability over 1000 h.

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