Cu-Ion-Implanted and Polymeric Carbon Nitride-Decorated TiO Nanotube Array for Unassisted Photoelectrochemical Water Splitting.

ACS Appl Mater Interfaces

Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China.

Published: September 2021

Photoelectrochemical (PEC) water splitting over TiO photoanodes is a promising strategy for hydrogen production due to its eco-friendly, energy-saving, and low-cost nature. However, the intrinsic drawbacks of TiO, ., the too wide band gap and rapid exciton recombination, significantly limit further enhancement of its performance. Herein, we report a TiO nanotube array (TNA), which is implanted by Cu ions and decorated by polymeric carbon nitride (PCN) nanosheets, as a photoanode for the high-efficiency PEC water splitting. In such designed material, Cu-ion implantation can effectively tailor the electronic structure of TiO, thus narrowing the band gap and enhancing the electronic conductivity. Meanwhile, the PCN decoration induces TiO/PCN heterojunctions, enhancing the visible light absorption and accelerating the exciton separation. Upon this synergistic effect, the modified TNA photoanode shows significantly improved PEC capability. Its photocurrent density, solar-to-hydrogen efficiency, and applied bias photon-to-current efficiency achieve 1.89 mA cm at 1.23 V (V reversible hydrogen electrode), 2.31%, and 1.20% at 0.46 V, respectively. Importantly, this modified TNA supported on a meshlike Ti substrate can be readily integrated with a perovskite solar cell to realize unassisted PEC water splitting.

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Source
http://dx.doi.org/10.1021/acsami.1c09665DOI Listing

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