J. Mater. Sci. Technol. ›› 2025, Vol. 209: 55-63.DOI: 10.1016/j.jmst.2024.04.074

• Research Article • Previous Articles     Next Articles

Enhanced room temperature CO2 photoreduction on gas-solid interfaces using nanocrystals integrated with ZIF-8 wrapping design

Xiaoxiong Houa, Zhuangzhuang Maa, Zhilei Zhangb,c, Xiaotong Gaoa, Hongqiang Wangd,*, Lichao Jiaa,*   

  1. aKey Laboratory of Applied Surface and Colloid Chemistry, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, National Ministry of Education, Shaanxi Normal University, Xi'an 710119, China;
    bBeijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
    cUniversity of the Chinese Academy of Sciences, Beijing 100049, China;
    dState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene, Xi'an 710072, China
  • Received:2024-02-19 Revised:2024-04-07 Accepted:2024-04-23 Published:2025-02-20 Online:2024-05-24
  • Contact: *E-mail addresses: hongqiang.wang@nwpu.edu.cn (H. Wang), lichaojia@snnu.edu.cn (L. Jia)

Abstract: Composites derived from metal-organic frameworks (MOFs) show promise as catalysts for the photocatalytic reduction of CO2. However, their potential is hindered by constraints such as limited light absorption and sluggish electron transfer and separation, impacting the overall efficiency of the photocatalytic process. In this study, TiO2 nanocrystals, modified with Ptx+, underwent laser etching were encapsulated within the traditional MOF-ZIF-8 framework. This enhanced the adsorption capabilities for CO2 reactants and solar light, while also facilitating directed electron transfer and the separation of photogenerated charges. The finely-tuned catalyst demonstrates impressive CH4 selectivity at 9.5 %, with yields of 250. 24 µmol g-1 h-1 for CO and 25.43 µmol g-1 h-1 for CH4, utilizing water as a hole trap and H+ source. This study demonstrates the viability of achieving characteristics related to the separation of photogenerated charges in TiO2 nanocrystals through laser etching and MOF composite catalysts. It offers novel perspectives for designing MOF-based catalysts with enhanced performance in artificial photosynthesis.

Key words: CO2 photoreduction, Nanocrystals, TiO2, ZIF-8, Wrapping structure