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Title: Photocatalytically Active Superstructures of Quantum Dots and Iron Porphyrins for Reduction of CO2 to CO in Water

Journal Article · · ACS Nano

In this paper, we describe the use of electrostatic assemblies of negatively charged colloidal CuInS2/ZnS quantum dot (QD) sensitizers and positively charged, trimethylamino-functionalized iron tetraphenylporphyrin catalysts (FeTMA) to photoreduce CO2 to CO in water upon illumination with 450 nm light. This system achieves a turnover number (TON) of CO (per FeTMA) of 450 after 30 h of illumination, with a selectivity of 99%. Its sensitization efficiency (TON per Joule of photons absorbed) is a factor of 11 larger than the previous record for photosensitization of an iron porphyrin catalyst for this reaction, held by a system in which both QDs and metal porphyrin were uncharged. Steady-state and time-resolved optical spectroscopy provides evidence for electrostatic assembly of QDs and FeTMA. Control of the size of the assemblies with addition of a screening counterion, K+, and a correlation between their measured size and their catalytic activity, indicates that the enhancement in performance of this system over the analogous uncharged system is due to the proximity of the FeTMA catalyst to multiple light-absorbing QDs and the selective formation of QD–FeTMA contacts (rather than QD–QD or FeTMA–FeTMA contacts). Finally, this system therefore shows the ability to funnel photoinduced electrons to a reaction center, which is crucial for carrying out reactions that require multistep redox processes under low photon flux, and thus is an important advance in developing artificial photocatalytic systems that function in natural light.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Bio-Inspired Energy Science (CBES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0000989; AC02-06CH11357
OSTI ID:
1470146
Journal Information:
ACS Nano, Vol. 12, Issue 1; Related Information: CBES partners with Northwestern University (lead); Harvard University; New York University; Pennsylvania State University; University of Michigan; University of Pittsburgh; ISSN 1936-0851
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 109 works
Citation information provided by
Web of Science

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Metal‐Complex/Semiconductor Hybrid Photocatalysts and Photoelectrodes for CO 2 Reduction Driven by Visible Light journal April 2019
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Hydrophobic Metal Halide Perovskites for Visible-Light Photoredox C−C Bond Cleavage and Dehydrogenation Catalysis journal February 2019
Zinc Thiolate Enables Bright Cu‐Deficient Cu‐In‐S/ZnS Quantum Dots journal April 2019
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Properties of quantum dots coupled to plasmons and optical cavities journal December 2019
Energy transfer-enhanced photocatalytic reduction of protons within quantum dot light-harvesting–catalyst assemblies journal August 2018
Visible‐Light‐Driven CO 2 Reduction by Mesoporous Carbon Nitride Modified with Polymeric Cobalt Phthalocyanine journal July 2019
Critical Aspects and Recent Advances in Structural Engineering of Photocatalysts for Sunlight‐Driven Photocatalytic Reduction of CO 2 into Fuels journal April 2019
Designing bifuncitonal molecular devices with a metalloporphyrin dimer journal January 2020
Water‐Soluble Conjugated Molecule for Solar‐Driven Hydrogen Evolution from Salt Water journal February 2019
Intermediates Adsorption Engineering of CO 2 Electroreduction Reaction in Highly Selective Heterostructure Cu‐Based Electrocatalysts for CO Production journal June 2019
Hydrophobic Metal Halide Perovskites for Visible‐Light Photoredox C−C Bond Cleavage and Dehydrogenation Catalysis journal March 2019
Quantum Dot Assembly for Light-Driven Multielectron Redox Reactions, such as Hydrogen Evolution and CO 2 Reduction journal May 2019
Atomic‐Level Reactive Sites for Semiconductor‐Based Photocatalytic CO 2 Reduction journal January 2020