Zhu Chengxin, Liu Qiong, Yan Huan, Zhang Wei, Chen Rong
State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan, 430200, PR China.
School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Donghu New & High Technology Development Zone, Wuhan, 430205, PR China.
ChemSusChem. 2025 Jan 14;18(2):e202401054. doi: 10.1002/cssc.202401054. Epub 2024 Sep 19.
The photocatalytic reduction of carbon dioxide (CO) has emerged as a compelling strategy for the conversion of renewable energy. However, the expeditious recombination of photogenerated charge carriers and the inadequate light absorption capabilities are currently predominant challenges. Herein, we developed a facile hydrothermal approach to synthesize a sulfur doped BiOCO nanosheet with a tunable energy band structure designed to enhance visible light absorption. Our findings indicate that the incorporation of sulfur into the catalytic sites induces an electron sink effect, significantly improving the separation efficiency of photogenerated charge carriers. Consequently, this sulfur-doped BiOCO catalyst exhibits a remarkable carbon monoxide (CO) yield of 16.64 μmol g h with nearly 100 % selectivity under illumination ranging from 420 to 780 nm. Through in-situ characterization techniques and theoretical calculations, it was revealed that sulfur-coordinated bismuth sites greatly enhance CO adsorption and decrease the energy barrier for critical intermediates formation (*COOH), thus selectively driving the reaction towards CO production. This work not only advances our understanding of mechanisms underlying photocatalytic reduction of CO on sulfur-doped bismuth-based catalysts but also sets a precedent for developing sophisticated photocatalytic systems for enhanced photoreduction reactions.
二氧化碳（CO₂）的光催化还原已成为一种极具吸引力的可再生能源转换策略。然而，光生电荷载流子的快速复合以及光吸收能力不足是目前主要面临的挑战。在此，我们开发了一种简便的水热法来合成具有可调谐能带结构的硫掺杂BiOCO纳米片，旨在增强可见光吸收。我们的研究结果表明，将硫引入催化位点会引发电子阱效应，显著提高光生电荷载流子的分离效率。因此，这种硫掺杂的BiOCO催化剂在420至780nm的光照下表现出显著的一氧化碳（CO）产率，为16.64 μmol g⁻¹ h⁻¹，选择性接近100%。通过原位表征技术和理论计算发现，硫配位铋位点极大地增强了CO吸附，并降低了关键中间体（*COOH）形成的能垒，从而选择性地推动反应朝着CO生成的方向进行。这项工作不仅加深了我们对硫掺杂铋基催化剂上CO光催化还原机制的理解，也为开发用于增强光还原反应的先进光催化系统开创了先例。
