Photocatalytic reduction of CO₂ to high value-added chemicals and fuels has received widespread attention. However, the higher thermodynamic stability of CO₂ greatly limits its conversion efficiency. Frustrated Lewis pairs (FLPs) have been well-established to be very effective in CO₂ activation. In this work, we prepared ZnIn₂S₄–AlOOH (ZIS–AlOOH) composites for visible-light-driven CO₂ reduction. The Lewis basic O_Hv sites on the AlOOH surface (one H removed from OH) and an adjacent Lewis acidic unsaturated Al site (Al³⁺_unsatur.) form the FLPs. The composite structure facilitated light absorption, CO₂ adsorption activation, and separation of photogenerated carriers, thus improving the CO₂ photoreduction activity (CO generation rate of 510.3 μmol g⁻¹ h⁻¹), and suppressing hydrogen evolution with the CO/H₂ ratio increasing from 0.38 for ZnIn₂S₄ (ZIS) to 0.84 for ZIS–AlOOH. This work elucidates a rational strategy for the construction of efficient photocatalysts and provides insight into the mechanism of the photocatalytic CO₂ reduction reaction.

中文翻译：

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ZnIn2S4-AlOOH复合材料的制备用于光催化还原CO2为CO

光催化还原CO ₂生产高附加值化学品和燃料受到广泛关注。然而CO ₂较高的热力学稳定性极大地限制了其转化效率。受阻路易斯对 (FLP) 已被证实在 CO ₂活化中非常有效。在这项工作中，我们制备了用于可见光驱动的CO _{2还原的ZnIn 2} S ₄ –AlOOH (ZIS-AlOOH) 复合材料。AlOOH 表面上的路易斯碱性 O _{Hv位点（从 OH 中除去一个 H）和相邻的路易斯酸性不饱和 Al 位点（Al} ³⁺_不饱和）形成 FLP。该复合结构有利于光吸收、CO ₂吸附活化和光生载流子的分离，从而提高CO ₂光还原活性（CO生成率为510.3 μmol g ^-1 h ^-1），并抑制CO/H ₂的析氢。比率从 ZnIn ₂ S ₄ (ZIS) 的 0.38 增加到 ZIS-AlOOH 的 0.84。这项工作阐明了构建高效光催化剂的合理策略，并深入了解光催化CO ₂还原反应的机理。