Sun, Y; Jin, D; Sun, Y; Meng, X; Gao, Y; Dall'Agnese, Y; Chen, G; Sun, Y; Jin, D; Sun, Y; Meng, X; Gao, Y; Dall'Agnese, Y; Chen, G; Wang, XF; - view fewer (2018) g-C3N4/Ti3C2Tx (MXenes) composite with oxidized surface groups for efficient photocatalytic hydrogen evolution. Journal of Materials Chemistry A , 6 (19) pp. 9124-9131. 10.1039/c8ta02706d.

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Abstract

Ti3C2Tx is a 2-dimensional titanium carbide material featuring outstanding electrochemical properties. In spite of this, application of Ti3C2Tx as co-catalyst in photo-catalysis is rarely explored, probably because of its metallic nature and hydrophilic surface. Given that Ti3C2Tx with different surface terminations exhibits large differences in catalytic, electrochemical and chemical properties, we demonstrate an improvement of the photocatalytic activity of Ti3C2Tx as a co-catalyst by annealing a composite of carbon nitride and Ti3C2Tx. Ti3C2Tx with an oxygen terminated surface improved the separation of electron-hole pairs and resulted in a 105% enhancement in the production ratio of hydrogen evolution compared to control samples. The best hydrogen production performance reached as high as 88 μmol h-1 gcat-1. The apparent quantum yield (AQY) reached as high as 1.27%. The DFT calculations also demonstrate a better hydrogen evolution on Ti3C2 with oxygen surface termination.

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