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Title: Elucidating Charge Separation Dynamics in a Hybrid Metal–Organic Framework Photocatalyst for Light-Driven H 2 Evolution

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. Here, 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 H 2 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 L 3-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.

Authors:
 [1];  [2];  [1];  [1];  [3]; ORCiD logo [3]; ORCiD logo [1]
  1. Marquette Univ., Milwaukee, WI (United States). Dept. of Chemistry
  2. Wuyi Univ., Jiangmen (China). School of Applied Physics and Materials
  3. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); American Chemical Society Petroleum Research Fund (ACS PRF)
OSTI Identifier:
1461304
Grant/Contract Number:  
AC02-06CH11357; DMR-1654140; 57503-DNI6
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 122; Journal Issue: 6; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 14 SOLAR ENERGY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

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. United States: N. p., 2018. Web. doi:10.1021/acs.jpcc.8b00471.
Yang, Sizhuo, Fan, Donghua, Hu, Wenhui, Pattengale, Brian, Liu, Cunming, Zhang, Xiaoyi, & Huang, Jier. Elucidating Charge Separation Dynamics in a Hybrid Metal–Organic Framework Photocatalyst for Light-Driven H2 Evolution. United States. doi:10.1021/acs.jpcc.8b00471.
Yang, Sizhuo, Fan, Donghua, Hu, Wenhui, Pattengale, Brian, Liu, Cunming, Zhang, Xiaoyi, and Huang, Jier. Tue . "Elucidating Charge Separation Dynamics in a Hybrid Metal–Organic Framework Photocatalyst for Light-Driven H2 Evolution". United States. doi:10.1021/acs.jpcc.8b00471. https://www.osti.gov/servlets/purl/1461304.
@article{osti_1461304,
title = {Elucidating Charge Separation Dynamics in a Hybrid Metal–Organic Framework Photocatalyst for Light-Driven H2 Evolution},
author = {Yang, Sizhuo and Fan, Donghua and Hu, Wenhui and Pattengale, Brian and Liu, Cunming and Zhang, Xiaoyi and Huang, Jier},
abstractNote = {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. Here, 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.},
doi = {10.1021/acs.jpcc.8b00471},
journal = {Journal of Physical Chemistry. C},
number = 6,
volume = 122,
place = {United States},
year = {2018},
month = {1}
}

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