Elucidating Charge Separation Dynamics in a Hybrid Metal–Organic Framework Photocatalyst for Light-Driven H₂ Evolution

Authors

Sizhuo Yang, Marquette UniversityFollow
Donghua Fan, Wuyi University
Wenhui Hu, Marquette University
Brian Pattengale, Marquette University
Cunming Liu, Argonne National LaboratoryFollow
Xiaoyi Zhang, Argonne National LaboratoryFollow
Jier Huang, Marquette UniversityFollow

Document Type

Article

Language

eng

Publication Date

1-30-2018

Publisher

American Chemical Society

Source Publication

Journal of Physical Chemistry: C

Source ISSN

1932-7447

Abstract

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.

Comments

Accepted version. Journal of Physical Chemistry : C, Vol. 122, No. 6 (January 30, 2018): 3305-3311. DOI. © 2018 American Chemical Society. Used with permission.

Recommended Citation

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.
https://epublications.marquette.edu/chem_fac/975