Elucidating Charge Separation Dynamics in a Hybrid Metal–Organic Framework Photocatalyst for Light-Driven H2 Evolution
American Chemical Society
Journal of Physical Chemistry: C
Metal–organic frameworks (MOFs) have emerged as novel scaffolds for artificial photosynthesis due to their unique capability in incorporating homogeneous photosensitizer and catalyst to their robust heterogeneous matrix. In this work, we report the charge separation dynamics between molecular Ru-photosensitizer and Pt-catalyst, both of which were successfully incorporated into a Zr-MOF that demonstrates excellent activity and stability for light-driven H2 generation from water. Using optical transient absorption (OTA) spectroscopy, we show that charge separation in this hybrid MOF occurs via electron transfer (ET) from Ru-photosensitizer to Pt-catalyst. Using Pt L3-edge X-ray transient absorption (XTA) spectroscopy, we observed the intermediate reduced Pt site, directly confirming the formation of charge separated state due to ET from Ru-photosensitizer and unraveling their key roles in photocatalysis.
Yang, Sizhuo; Fan, Donghua; Hu, Wenhui; Pattengale, Brian; Liu, Cunming; Zhang, Xiaoyi; and Huang, Jier, "Elucidating Charge Separation Dynamics in a Hybrid Metal–Organic Framework Photocatalyst for Light-Driven H2 Evolution" (2018). Chemistry Faculty Research and Publications. 975.
ADA Accessible Version
Accepted version. Journal of Physical Chemistry : C, Vol. 122, No. 6 (January 30, 2018): 3305-3311. DOI. © 2018 American Chemical Society. Used with permission.