1 Department of Chemical and Materials Engineering and Centre for NanoScience Research, Gina Cody School of Computer Science and Engineering, Concordia University, Montréal, QC, Canada.
2 Department of Chemistry, McGill University, Québec, Canada.
3 Facultad de Ciencias, Departamento de Química, Grupo de Investigación en Química de Coordinación y Bioinorgánica, Universidad Nacional de Colombia, Sede Bogotá, Colombia.
4 Centre for Biocomposites and Biomaterials Processing, Division of Forestry, Daniels Faculty of Architecture Landscape and Design, University of Toronto, Toronto, Canada.

Microwave-assisted synthesis offers several advantages over conventional methods, including shorter reaction times and more efficient heating in systems containing polar solvents such as water or ethanol. These features can be exploited to prepare and modify active photocatalysts for H₂-production reactions, allowing precise tuning of composition and final properties of the solids and boosting their performance. In this work, the modification of TiO₂ nanotube arrays with Cu and Ni was explored using a microwave-assisted methodology. The modified materials displayed an H₂ production rate of 1.427 µmol H₂.h^-1.cm^-2, corresponding to a 14-fold increase relative to the original TiO₂ nanotube arrays, with a partial retention of the activity after four cycles of operation. These results highlight the importance of alternative synthesis methods to achieve more effective modification of photocatalytic systems and demonstrate the promising role of non-noble metals in developing more sustainable and accessible technologies for green hydrogen production.