Wang Fangjun, Chen Shiyi, Wu Jiang, Xiang Wenguo, Duan Lunbo
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University No. 2 Sipailou, Xuanwu District Nanjing 210096 China
College of Energy and Mechanical Engineering, Shanghai University of Electric Power No. 2103 Pingliang Road Shanghai 200090 China
RSC Adv. 2025 May 9;15(19):15282-15292. doi: 10.1039/d5ra02234g. eCollection 2025 May 6.
Carbon dioxide (CO) is not only a greenhouse gas but also an abundant carbon resource. By using solar energy to reduce CO into high-value hydrocarbons photocatalysis, we can mitigate the greenhouse effect and enable energy recycling. In this paper, a two-step calcination process was employed to thermally exfoliate graphite-phase carbon nitride (g-CN) into ultrathin nanosheets, after which the CuS co-catalyst was loaded onto the g-CN surface using a one-step hydrothermal method. The ultrathin nanosheet structure of g-CN can increase the specific surface area of the composite material and improve the anchoring of active components and CO adsorption sites. CuS, acting as a co-catalyst, can capture photogenerated electrons from the g-CN conduction band, thereby enhancing the separation and migration of photogenerated charges. Moreover, the interfacial charge transfer (IFCT) mechanism of CuS enhances the efficiency of separating photogenerated electrons and holes. The prepared 10CuS/g-CN composite photocatalyst, loaded with 10 wt% CuS, has significantly improved CO photoreduction performance. The highest CO yield reached 15.34 μmol g. This work provides guidance for developing low-cost artificial photosynthesis to utilize CO as a resource.
二氧化碳（CO₂）不仅是一种温室气体，也是一种丰富的碳资源。通过利用太阳能将CO₂光催化还原为高价值的碳氢化合物，我们可以减轻温室效应并实现能量循环利用。本文采用两步煅烧工艺将石墨相氮化碳（g-C₃N₄）热剥离成超薄纳米片，然后采用一步水热法将CuS助催化剂负载到g-C₃N₄表面。g-C₃N₄的超薄纳米片结构可以增加复合材料的比表面积，改善活性组分和CO₂吸附位点的锚定。CuS作为助催化剂，可以从g-C₃N₄导带捕获光生电子，从而增强光生电荷的分离和迁移。此外，CuS的界面电荷转移（IFCT）机制提高了光生电子和空穴的分离效率。制备的负载10 wt% CuS的10CuS/g-C₃N₄复合光催化剂具有显著提高的CO₂光还原性能。最高CO₂产率达到15.34 μmol g⁻¹。这项工作为开发低成本人工光合作用以利用CO₂作为资源提供了指导。
