Scalable Nickel-Chelated Polydopamine Conformal Coatings for Enhanced Long-term Photostability of BiVO₄ Photoanodes

Abstract

Large-scale bismuth vanadate (BiVO₄) photoanodes are critical to the practical application of photoelectrochemical water splitting devices. However, the lack of interface-modified coatings with simultaneous low cost, scalability, high hole transport efficiency, low impedance, and photocorrosion resistance is a major challenge that prevents the practical application of large-size photoanodes. Here, we present a scalable nickel-chelated polydopamine conformal coating for modifying BiVO₄ (BiVO₄@PDA-Ni, BPNi), achieving over 500 h of stable water oxidation at 0.6 V_RHE. The excellent stability is attributed to the chelated Ni acting as hole oxidation sites for PDA, thereby suppressing the accumulated-holes-induced PDA decomposition. Additionally, the in situ generation of Ni(IV) facilitates the structural reorganization of PDA in the photoelectrochemical system, further enhancing the stability of the PDA matrix. The findings of PDA photodegradation, its autonomous metal ion capture within photoelectrochemical systems, and the rapid deactivation of BPNi photoanodes caused by vanadium (V) ions have all provided significant guidance for the enhancement of PDA. Our study demonstrates that nickel-chelated polydopamine can be applied to large-scale BiVO₄ photoanodes to facilitate oxygen evolution. This will promote the development of large-scale photoanodes suitable for photoelectrochemical devices.

Keywords

bismuth vanadate / oxygen evolution reaction / photoelectrochemical water splitting / polydopamine nickel

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2025 The Author(s). Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.