Fabrication TiO 2 with conductive two-dimensional materials is an effective strategy to improve its photocatalytic activity. Herein, a well-de ned carbon doped TiO 2 /Ti 3 C 2 heterojucntion is constructed via in-situ controllable oxidation of Ti 3 C 2 MXene in carbon dioxide. The formed carbon doped TiO 2 nanoparticles as the photocatalyst uniformly disperse on the surface of Ti 3 C 2 MXene and generate electrons and holes under the irradiation. The twodimensional Ti 3 C 2 MXene, ascribing to its excellent conductivity, acts as the electron transport channels and accelerates the separation of photo-generated electrons and holes. Meanwhile, due to its large speci c surface area and good solubility, Ti 3 C 2 MXene may facilitate to enhance the adsorption of pollutant on the photocatalyst as well as the absorption of photocatalyst for visible light. Therefore, the unique properties of TiO 2 and Ti 3 C 2 MXene are integrated in a complementary way and signi cantly improve the photocatalytic performance of the composites.The proper content of Ti 3 C 2 MXene and TiO 2 in the composite is crucial for enhancing the photocatalytic performance, which can be effectively tuned by varying the oxidation temperature. In this work, C-TiO 2 /Ti 3 C 2 oxidized at 400 o C presents the optimum photocatalytic performance.

Constructing transition metal nitrides (TMNs) with a 2D porous structure is an effective strategy to alleviate their volume expansion and self-aggregation issues, eventually enhancing their electrochemical performance. However, very few studies have been reported up to now. Herein, 2D porous Nb4N5@Nb2C heterojunctions are successfully synthesized from Nb2C MXene precursor by employing a two-step nitridation method in NH3 atmosphere. Owing to the abundant active sites, fast Li-ions diffusion paths, and sufficient buffer space for releasing volume expansion, 2D porous Nb4N5@Nb2C heterojunctions achieve high rate performance and excellent cycling stablility, maintaining 109.2 mAh g-1 at 2 A g-1 after 800 cycles. This work provides a facile strategy for building 2D porous TMNs and their heterojunctions with excellent electrochemical performances.

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Fabrication TiO2 with conductive two-dimensional materials is an effective strategy to improve its photocatalytic activity. Herein, a well-defined carbon doped TiO2/Ti3C2 heterojucntion is constructed via in-situ controllable oxidation of Ti3C2 MXene in carbon dioxide. The formed carbon doped TiO2 nanoparticles as the photocatalyst uniformly disperse on the surface of Ti3C2 MXene and generate electrons and holes under the irradiation. The two-dimensional Ti3C2 MXene, ascribing to its excellent conductivity, acts as the electron transport channels and accelerates the separation of photo-generated electrons and holes. Meanwhile, due to its large specific surface area and good solubility, Ti3C2 MXene may facilitate to enhance the adsorption of pollutant on the photocatalyst as well as the absorption of photocatalyst for visible light. Therefore, the unique properties of TiO2 and Ti3C2 MXene are integrated in a complementary way and significantly improve the photocatalytic performance of the composites. The proper content of Ti3C2 MXene and TiO2 in the composite is crucial for enhancing the photocatalytic performance, which can be effectively tuned by varying the oxidation temperature. In this work, C-TiO2/Ti3C2 oxidized at 400 oC presents the optimum photocatalytic performance.

No abstract