Real-Space Visualization of CO 2 Capture, Diffusion, and Release in Surface-Confined Metal–Organic Frameworks

Authors:
Publisher website
Google Scholar
Abstract
Metal-organic frameworks (MOFs) show significant potential for addressing the urgent demand for high-efficiency carbon dioxide (CO2) capture and conversion. However, gaining mechanistic insights into CO2 diffusion processes and host-guest interactions within MOFs remains largely unexplored, due to the challenges associated with atomic-scale imaging. Here, we directly visualize the binding configurations of CO2 molecules and their dynamic evolution in real space and real time within surface-confined MOFs by combining in situ CO2 dosing with atomic-resolution scanning probe microscopy. Bond-resolved imaging reveals two distinct CO2 adsorption configurations, arising from the interactions between flat adsorbed CO2 and ligand/metal coordination sites of MOFs. Well-organized CO2 patterns composed of alternating triangular and rhombic subunits are clearly identified within the MOF pores. Temperature-dependent measurements further identify characteristic regimes associated with early stages of CO2 capture, diffusion, and release. Furthermore, we show how a sudden increase of CO2 concentration would cause the instability and even collapse of MOFs. These observations highlight the dynamic and nonequilibrium nature of CO2 capture in surface-confined MOFs and demonstrate the power of real-space approaches for elucidating gas adsorption and diffusion mechanisms at the molecular scale.
Funding Information
  • Suzhou Municipal Science and Technology Bureau (SJC2023004)
  • Suzhou Municipal Science and Technology Bureau (ZXL2023338)
  • Collaborative Innovation Center of Suzhou Nano Science and Technology
  • Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics
  • Basic and Applied Basic Research Foundation of Guangdong Province (2023A1515140191)
  • Jiangsu Provincial Department of Science and Technology (BK20253040)
  • National Natural Science Foundation of China (22272158)
  • National Natural Science Foundation of China (22472196)
  • Higher Education Discipline Innovation Project
  • Jiangsu Specially-Appointed Professors Program
  • Suzhou Key Lab of Surface and Interface of Intelligent Matter (SZS2022011)
  • Gusu Innovation and Entrepreneurship Talent Program Major Innovation Team
  • Innovative Center for Molecular Science of Surface and Interface, Soochow University

This publication has 59 references indexed in Scilit: