4.8 Article

Enhanced Visible-Light-Driven Hydrogen Production through MOF/MOF Heterojunctions

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 12, Pages 14239-14247

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c23163

Keywords

metal-organic frameworks; photocatalysis; hydrogen production; heterojunctions; stability

Funding

  1. Department of Chemistry at Oregon State University
  2. Swiss National Science Foundation (SNF) under the Ambizione Energy Grant [PZENP2_166888]
  3. National Science Foundation [NNCI-1542101]
  4. National Science Foundation Major Research Instrumentation program [DMR1429765]
  5. M. J. Murdock Charitable Trust
  6. Oregon BEST
  7. Oregon Nanoscience and Microtechnologies Institute
  8. Oregon State University

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The photocatalytic performance of MOF-based systems can be enhanced through the construction of MOF/MOF heterojunctions. The MIL-167/MIL-125-NH2 heterojunction exhibits efficient photocatalytic H2 production under visible-light irradiation without the need for any cocatalysts.
A strategy for enhancing the photocatalytic performance of MOF- based systems (MOF: metal-organic framework) is developed through the construction of MOF/MOF heterojunctions. The combination of MIL-167 with MIL-125-NH2 leads to the formation of MIL-167/MIL-125-NH2 heterojunctions with improved optoelectronic properties and efficient charge separation. MIL-167/MIL-125-NH2 outperforms its single components MIL-167 and MIL-125-NH2, in terms of photocatalytic H-2 production (455 versus 0.8 and 51.2 mu mol h(-1) g(-1), respectively), under visible-light irradiation, without the use of any cocatalysts. This is attributed to the appropriate band alignment of these MOFs, the enhanced visible-light absorption, and long charge separation within MIL-167/MIL-125-NH2. Our findings contribute to the discovery of novel MOF-based photocatalytic systems that can harvest solar energy and exhibit high catalytic activities in the absence of cocatalysts.

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