Photocatalytic reduction of CO₂ into solar fuels is recognized an attractive approach to solve the environmental and energy crisis. MoS₂, a type of 2D transition metal dichalcogenides, has attracted significant attention in photoelectronics, sensors and photo/electrocatalytic water splitting owing to its remarkable properties. Nevertheless, to date, MoS₂ is barely used as (co)catalyst for CO₂ photoreduction. Herein, novel 1D/2D TiO₂/MoS₂ nanostructured hybrid with TiO₂ fibers covered by MoS₂ nanosheets by hydrothermal transformation method is fabricated. The MoS₂ sheet arrays show a lateral size of ≈80 nm and a thickness of down to 2 nm, vertically and uniformly standing upon the TiO₂ fibers. X‐ray photoelectron spectroscopy (XPS) results and density functional theory (DFT) calculation imply the intimate chemical interaction between MoS₂ and TiO₂ upon hybridization, which can facilitate electron–hole separation upon photoexcitation. In addition, the hierarchical TiO₂/MoS₂ nanostructure shows enhanced optical absorption and CO₂ adsorption, therefore, a superior photocatalytic activity for reducing CO₂ into methane and methanol is achieved over the hybrid as compared to pristine TiO₂. Isotope (¹³C) tracer test confirms that the products are produced from the photocatalytic reduction of the CO₂ source instead of any organic contaminants. This work offers an alternative approach to rationally design and synthesize TiO₂‐based photocatalysts toward high‐efficiency photoreduction of CO₂.

中文翻译：

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1D / 2D TiO2 / MoS2杂化纳米结构，用于增强光催化CO2还原

将CO ₂光催化还原为太阳能燃料是公认的解决环境和能源危机的有吸引力的方法。MoS ₂是一种2D过渡金属二卤化金属，由于其卓越的性能而在光电，传感器和光/电催化水分解中引起了广泛的关注。然而，迄今为止，MoS ₂几乎没有用作CO _2光还原的（共）催化剂。在此，利用水热转化法制备了新型的由MoS ₂纳米片覆盖的TiO ₂纤维的1D / 2D TiO ₂ / MoS ₂纳米结构杂化体。MoS ₂片状阵列的横向尺寸为≈80nm，厚度最小为2 nm，垂直且均匀地竖立在TiO ₂纤维上。X射线光电子能谱（XPS）的结果和密度泛函理论（DFT）的计算表明，杂交后MoS ₂和TiO ₂之间存在紧密的化学相互作用，这可以促进光激发时电子-空穴的分离。此外，分层的TiO ₂ / MoS ₂纳米结构显示出增强的光吸收和CO ₂吸附，因此，与原始TiO ₂相比，该杂化剂具有优异的光催化活性，可将CO ₂还原为甲烷和甲醇。同位素（¹³ C）示踪剂测试证实，该产品是由光催化还原CO ₂源而不是任何有机污染物产生的。这项工作为合理设计和合成基于TiO ₂的光催化剂提供了另一种方法，以实现高效的CO ₂光还原。