Hydrogen production through facile photocatalytic water splitting is regarded as a promising strategy to solve global energy problems. Transition‐metal carbides (MXenes) have recently drawn attention as potential co‐catalyst candidates for photocatalysts. Here, we report niobium pentoxide/carbon/niobium carbide (MXene) hybrid materials (Nb₂O₅/C/Nb₂C) as photocatalysts for hydrogen evolution from water splitting. The Nb₂O₅/C/Nb₂C composites were synthesized by one‐step CO₂ oxidation of Nb₂CT_x. Nb₂O₅ grew homogeneously on Nb₂C after mild oxidation, during which some amorphous carbon was also formed. With an optimized oxidation time of 1.0 h, Nb₂O₅/C/Nb₂C showed the highest hydrogen generation rate (7.81 μmol h⁻¹ g_cat⁻¹), a value that was four times higher than that of pure Nb₂O₅. The enhanced performance of Nb₂O₅/C/Nb₂C was attributed to intimate contact between Nb₂O₅ and conductive Nb₂C and the separation of photogenerated charge carriers at the Nb₂O₅/Nb₂C interface; the results presented herein show that transition‐metal carbide are promising co‐catalysts for photocatalytic hydrogen production.

中文翻译：

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Nb2O5 / C / Nb2C（MXene）复合材料的一步合成及其作为光催化制氢的用途

通过简便的光催化水分解制氢技术被认为是解决全球能源问题的有前途的战略。过渡金属碳化物（MXenes）作为光催化剂的潜在助催化剂候选物最近受到了关注。在这里，我们报告五氧化二铌/碳/碳化铌（MXene）杂化材料（Nb ₂ O ₅ / C / Nb ₂ C）作为光分解水分解氢的光催化剂。Nb ₂ CT _x的一步一步CO ₂氧化合成了Nb ₂ O ₅ / C / Nb ₂ C复合材料。Nb ₂ O ₅在Nb _2上均匀生长温和氧化后的碳，在此期间还形成了一些无定形碳。Nb ₂ O ₅ / C / Nb ₂ C的最佳氧化时间为1.0 h，显示出最高的氢生成速率（7.81μmolh ^-1  g _cat ^-1），该值是纯Nb _2的四倍。O ₅。Nb ₂ O ₅ / C / Nb ₂ C的性能增强归因于Nb ₂ O ₅和导电Nb ₂ C之间的紧密接触以及Nb ₂ O ₅ / Nb处光生载流子的分离_2个C接口；本文介绍的结果表明，过渡金属碳化物是光催化制氢的有前途的助催化剂。