The efficient conversion of CO into hydrocarbon fuels (CH) with high selectivity is considered as a great challenge in photocatalysis owing to the multiple-electron transfer pathway and competitive H generation. Herein, we developed carbon dots (CDs)-modulated S-scheme heterojunction of CDs/NiAl-LDH@InO (C-DH@IN) through a facile hydrothermal method. Thanks to the multi-shell nanotube structure, the C-DH@IN shows an enhanced CH evolution rate of 10.67 µmol h g and higher selectivity of CH (85.70%) compared with InO and NiAl-LDH@InO binary catalyst in the pure water without sacrificial agent. Electron spin resonance (ESR) and Fourier transform infrared spectra verify that the constructed S-scheme heterojunction can possess the strong redox capability and the HCOO and CHO as critical intermediates play an important role in selective CO reduction to generate CH. Furthermore, CDs with superior photoabsorption can boost the electron transfer and absorb H, thus improving the integration of H and CO molecule. Therefore, this work emphasizes a facile strategy to achieve efficient CO-to-CH conversion based on construction of CDs-based heterojunction catalysts.

中文翻译：

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碳点锚定NiAl-LDH@In2O3分层纳米管促进选择性CO2光还原成CH4

由于多电子转移途径和竞争性氢气生成，高选择性地将CO有效转化为碳氢化合物燃料（CH）被认为是光催化领域的一个巨大挑战。在此，我们通过简便的水热方法开发了碳点（CD）调制的CD/NiAl-LDH@InO（C-DH@IN）的S型异质结。由于具有多壳纳米管结构，与 InO 和 NiAl-LDH@InO 二元催化剂相比，C-DH@IN 在纯水中表现出 10.67 µmol hg 的 CH 演化速率和更高的 CH 选择性（85.70%）。牺牲剂。电子自旋共振（ESR）和傅里叶变换红外光谱验证了所构建的S型异质结具有很强的氧化还原能力，并且HCOO和CHO作为关键中间体在选择性CO还原生成CH中发挥着重要作用。此外，具有优异光吸收能力的碳点可以促进电子转移并吸收H，从而改善H和CO分子的结合。因此，这项工作强调一种基于 CDs 异质结催化剂构建的简便策略，以实现有效的 CO 到 CH 的转化。