Gas-phase photocatalytic reactions to convert carbon dioxide and water into oxygen and hydrocarbons are the foundation of life on earth. However, the efficiency of photosynthesis is relatively low (∼1%), which leaves much room for artificial photosynthesis to reach the benchmark of the solar cells (>15%). In this work, carbon implanted SnS₂ thin films (C-SnS₂) were prepared to study photocatalytic activity and adsorbate-catalyst surface interactions during CO₂ photoreduction. The electron density distribution in C-SnS₂ and its contribution toward the photogenerated charge transfer process has been analyzed by the angle-dependent X-ray absorption near-edge structure (XANES) study. The C-SnS₂ surface affinity toward the CO₂ molecule was monitored by in-situ dark current and Raman spectroscopy measurements. By optimizing the dose during ion implantation, SnS₂ thin film with 1 wt% carbon incorporation shows 108 times enhancement in the CO₂ conversion efficiency and more than 89% product selectivity toward CH₄ formation compared with the as-grown SnS₂ without carbon incorporation. The improved photocatalytic activity can be ascribed to enhanced light harvesting, pronounced charge-transfer between SnS₂ and carbon with improved carrier separation and the availability of highly active carbon sites that serve as favorable CO₂ adsorption sites.

将二氧化碳和水转化为氧气和碳氢化合物的气相光催化反应是地球生命的基础。但是，光合作用的效率相对较低（约1％），这为人工光合作用达到太阳能电池的基准（> 15％）留下了很大的空间。在这项工作中，准备了碳注入的SnS ₂薄膜（C-SnS ₂），以研究CO _2光还原过程中的光催化活性和吸附物-催化剂表面的相互作用。通过角度相关的X射线吸收近边缘结构（XANES）研究，分析了C-SnS _2中的电子密度分布及其对光生电荷转移过程的贡献。C-SnS ₂通过原位暗电流和拉曼光谱测量监测对CO ₂分子的表面亲和力。通过优化离子注入过程中的剂量，与未掺碳的SnS ₂相比，掺碳1 wt％的SnS ₂薄膜的CO ₂转化效率提高了108倍，产品对CH ₄形成的选择性超过89％。。改善的光催化活性可以归因于增强的光收集，SnS ₂和碳之间的显着电荷转移，改善的载流子分离以及用作有利CO ₂的高活性碳位的可用性 吸附位。