Tailored Nickel Oxide Interfacial Layers Unlock Enhanced Charge Dynamics in LaTiOₓNᵧ Thin Film Photoanodes

Le résumé fourni par la source

LaTiO₂N (LTON) is a very attractive visible light responsive semiconductor for the fabrication of photoanodes for H₂ production by solar`ting. To design a feasible process, the other half of the water splitting reaction, the oxygen evolution reaction (OER), must be realized, and it is crucial to pair the photoanodes with appropriate OER catalysts such as nonstoichiometric nickel oxide (NiOₓ). The application of NiOₓ interfacial layers to LTON thin film photoanodes significantly enhances photocurrent performance by improving charge extraction and minimizing recombination. This work demonstrates that NiOₓ functions as both a charge-selective layer and a recombination barrier, achieving record photocurrents for sub-50 nm LTON films in alkaline and sulfite-buffered electrolytes. Time-resolved and electrochemical analyses reveal that these improvements stem from effective Fermi-level de-pinning, bulk-to-surface charge transport enhancement, and the presence of scavengeable long-lived charges. These findings underscore the potential of NiOₓ as a highly effective interfacial layer for solar water splitting utilizing LTON, a superior oxynitride.

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