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Anion Shielding in Nb-WO3/WS2 Heterostructures: A Strategy for Efficient and Corrosion-Resistant Seawater
Lin Yang1,2, Zihao Xing1, Yijun Chen1
1Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China.
Abstract:
Seawater electrolysis is a promising route for sustainable hydrogen production, but chloride-induced corrosion severely limits its practicality. Here, a dual-modulated Nb-WO3/WS2 heterostructure electrocatalyst that simultaneously enhances oxygen evolution reaction (OER) kinetics and resists chloride corrosion is designed. The Nb-WO3/WS2 anode achieves remarkably low overpotentials of 212 and 369 mV at 10 and 100 mA cm-2, respectively, in alkaline simulated seawater, with a Tafel slope of 35.58 mV dec-1. The catalyst also exhibits remarkable stability, maintaining performance over 1000 CV cycles. Mechanistic studies reveal that Nb doping introduces oxygen vacancies and modulates the electronic structure, while the in situ formation of a WOx protective layer during OER effectively repels Cl- via anion shielding. This work provides a strategic approach to developing durable, efficient, and non-precious-metal-based catalysts for seawater splitting.
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