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Title: Mechanistic Probes of Zeolitic Imidazolate Framework for Photocatalytic Application

Journal Article · · ACS Catalysis

In this work, we report a zeolitic imidazolate framework (ZIF-67) with remarkable activity for hydrogen evolution reaction (HER) of 40,500 μmol H2/g MOF, which is, to the best of our knowledge, the highest activity achieved by any MOF system. This result necessitated assessment of its atomic-scale mechanistic function for HER using advanced spectroscopy techniques including time-resolved optical (OTA) and in situ X-ray absorption (XAS) spectroscopy. Through the correlation of OTA results with catalytic performance, we demonstrated that the electron transfer (ET) rather than energy transfer (ENT) pathway between photosensitizer and ZIF-67 is the key factor that controls the efficiency of HER activity, as HER activity that undergoes ET pathway is 3 orders of magnitude higher than that of ENT process. Here, using in situ XAS, we unraveled the spectral features for key intermediate species which are likely responsible for the rate determining process under turn over conditions. Finally, this work represents an original approach to study porous ZIF materials at the molecular level using advanced spectroscopic techniques, providing unprecedented insights into the photoactive nature of ZIF frameworks.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1416007
Journal Information:
ACS Catalysis, Vol. 7, Issue 12; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (8)

Metal–organic frameworks (ZIF-67) as efficient cocatalysts for photocatalytic reduction of CO 2 : the role of the morphology effect journal January 2018
Atomically Dispersed Single Co Sites in Zeolitic Imidazole Frameworks Promoting High‐Efficiency Visible‐Light‐Driven Hydrogen Production journal June 2019
Structural, electronic, and dielectric properties of a large random network model of amorphous zeolitic imidazolate frameworks and its analogues journal January 2019
Fabrication of WO 2.72 /UiO-66 nanocomposites and effects of WO 2.72 ratio on photocatalytic performance: judgement of the optimal content and mechanism study: UiO-66 supported highly-dispersed WO 2.72 nanorods journal April 2018
Recent Advances in Photocatalysis over Metal–Organic Frameworks‐Based Materials journal December 2019
Photoinduced interfacial charge separation dynamics in zeolitic imidazolate framework journal January 2018
Photonic functional metal–organic frameworks journal January 2018
Rational Design of Hierarchical, Porous, Co‐Supported, N‐Doped Carbon Architectures as Electrocatalyst for Oxygen Reduction journal January 2020