article · The Journal of Physical Chemistry C
Production efficiency of solar-driven hydrogen (H2) through water splitting relies strongly on the activity and stability of semiconductor photocatalysts. Black TiO2 semiconductors have shown specific promise for photocatalysis due to their enhanced solar light absorption by the formation of oxygen vacancies and Ti3+ species, but their fabrication and functionalization are very challenging. Herein, we report the synthesis of Ti3C2Tx (MXene)-derived black TiO2 with atomically anchored nickel (Ni) species for the photocatalytic hydrogen evolution reaction. Advanced characterization techniques such as X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and high-resolution transmission electron microscopy verified the presence of Ni–O bonds, confirming that the Ni atoms are coordinated with the surrounding O atoms from anatase black TiO2 with oxygen vacancies (TiO2–Ov). The introduction of atomic Ni species onto black TiO2–Ov promoted the separation of photogenerated charge carriers, thus leading to a significant enhancement in photocatalytic H2 production. Specifically, our Ni–TiO2–Ov delivered a H2 production rate of 697.44 μmol g–1 h–1 under 365 nm light-emitting diode light, which is 3.7 times higher than that of the system with bare black TiO2–Ov. This work paves the way to the design of functional black TiO2 materials using a facile and low-cost strategy.
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DOI: 10.1021/acs.jpcc.4c03169
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