Zhang Bo, Chen Yijun, Li Fei, Zhang Yang, Li Xiang, Xiong Wuwan, Dai Weili
College of Environmental and Chemical Engineering, Zhaoqing University Zhaoqing 526061 P. R. China
The Key Lab of Pollution Control and Ecosystem Restoration in Industry Cluster Ministry of Education, South China University of Technology P. R. China.
Nanoscale Adv. 2024 Dec 30;7(4):1195-1203. doi: 10.1039/d4na00969j. eCollection 2025 Feb 11.
Photocatalytic reduction of CO to produce organic fuels is a promising strategy for addressing carbon reduction and energy scarcity. Transition metal carbides (TiCT ) are of particular interest due to their unique layered structures and excellent electrical conductivity. However, the practical application of TiCT is limited by the poor separation efficiency of photogenerated charge carriers and the low migration ability of photogenerated electrons. Herein, Ag/AgS/TiCT heterojunctions were synthesized by depositing Ag/AgS nanoparticles onto layered TiCT substrates using a combination of co-precipitation and photoreduction methods. Fluorescence spectra, UV diffuse reflection, and photoelectric chemical characterizations demonstrated that Ag/AgS/TiCT heterojunctions provided effective channels for the reverse and synergistic migration of electrons and holes, leading to improved spatial separation. Notably, the Ag component in the composite acts as an electron acceptor and reactive center, significantly enhancing the migration ability of photogenerated electrons. The total alcohol yield over Ag/AgS/TiCT (125.3 μmol g ) was 5.1 times higher than that on AgS (24.7 μmol g ) and 2.1 times higher than on TiCT (60.7 μmol g ). This study offers valuable insights into designing efficient photocatalytic CO reduction catalysts.
光催化还原CO以生产有机燃料是解决碳减排和能源短缺问题的一种有前景的策略。过渡金属碳化物（TiCT ）因其独特的层状结构和优异的导电性而备受关注。然而，TiCT 的实际应用受到光生电荷载流子分离效率低和光生电子迁移能力低的限制。在此，通过共沉淀和光还原方法相结合，将Ag/AgS纳米颗粒沉积在层状TiCT 基底上，合成了Ag/AgS/TiCT 异质结。荧光光谱、紫外漫反射和光电化学表征表明，Ag/AgS/TiCT 异质结为电子和空穴的反向协同迁移提供了有效通道，从而改善了空间分离。值得注意的是，复合材料中的Ag组分作为电子受体和反应中心，显著提高了光生电子的迁移能力。Ag/AgS/TiCT 上的总醇产率（125.3 μmol g ）比AgS上的（24.7 μmol g ）高5.1倍，比TiCT 上的（60.7 μmol g ）高2.1倍。这项研究为设计高效的光催化CO还原催化剂提供了有价值的见解。
