MXene-MODIFIED BiVO4/FePO4 PHOTOANODES For SOLAR OXYGEN EVOLUTION
Micaela Pozzati a, Chiara Deriu a, Paola Ragonese b, Mattia Cattelan c, Francesco Lamberti c, Veronika Zahorodna d e, Roberto Altieri f, Yana Ihnatenko d e, Serhii Dukhnovskiy d e, Ivan Baginskiy d e, Oleksiy Gogotsi d e, Isabella Poli b, Laura Fabris a, Teresa Gatti a, Mengjiao Wang a
a Department of Applied Science and Technology (DISAT), Politecnico di Torino, 10129 Torino, Italy
b Center for Sustainable Future Technologies, Istituto Italiano di Tecnologia, Via Livorno 60, Torino, 10144 Italy
c Dipartimento di Scienze Chimiche, University of Padova, Via Tiepolo 6, 35129 Padua, Italy, Padua, 35129, Italy
d Materials Research Centre, 3 Krzhizhanovskogo Str., 03142 Kyiv, Ukraine
e Y-Carbon Ltd., 18 Bohdana Havrylyshyna st, Kyiv, Ukraine
f Justus-Liebig University Giessen, Center for Materials Research
Proceedings of MATSUS Fall 2026 Conference (MATSUSFall26)
E5 From Materials Innovation to Sustainable Photo-Assisted Electrochemical Systems
Palma, Spain, 2026 October 26th - 30th
Organizers: Teresa Gatti and Isabella Poli
Oral, Micaela Pozzati, presentation 103
Publication date: 22nd July 2026

Photoelectrochemical (PEC) water oxidation offers a promising route for solar fuel production, yet its efficiency remains critically limited by the sluggish kinetics of the anodic oxygen evolution reaction (OER) [1,2]. BiVO is among the most studied photoanode materials due to its favorable bandgap and valence band position, but its practical performance is severely hindered by poor charge transport and surface recombination [3]. Here, we report a novel scalable fabrication strategy that, for the first time, combines the Autodrop process and automated spray coating for the sequential deposition of FePO and TiCTₓ MXene overlayers onto BiVO photoanodes. This two-step approach enables precise control over each functional layer while remaining fully compatible with large-scale production. The FePO interlayer acts as a surface passivation and hole-transport layer [4], while the highly conductive MXene nanosheets serve as a co-catalytic interface and conductive bridge, collectively suppressing recombination and accelerating OER kinetics. Systematic optimization of MXene loading reveals a critical balance between MXene coverage and FePO exposure, achieving an approximately 50% improvement in photocurrent density. Furthermore, the MXene overlayer enhances photoanode stability by facilitating continuous hole extraction and preventing BiVO degradation under operating conditions. This work demonstrates a viable and reproducible route toward high-performance, stable photoanodes for solar fuel applications.

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