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ACS Appl Mater Interfaces. 2018 Sep 19;10(37):31225-31232. doi: 10.1021/acsami.8b04848. Epub 2018 Sep 6.

Metal-Organic Framework Thin Films on High-Curvature Nanostructures Toward Tandem Electrocatalysis.

Author information

1
Department of Materials Science and Engineering , University of Toronto , 184 College Street , Toronto , Ontario M5S 3E4 , Canada.
2
Division of Physical Science and Engineering (PSE), Advanced Membranes and Porous Materials Center (AMPM), Functional Materials Design, Discovery and Development (FMD3) , King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900 , Kingdom of Saudi Arabia.
3
Department of Electrical and Computer Engineering , University of Toronto , 35 St George Street , Toronto , Ontario M5S 1A4 , Canada.

Abstract

In tandem catalysis, two distinct catalytic materials are interfaced to feed the product of one reaction into the next one. This approach, analogous to enzyme cascades, can potentially be used to upgrade small molecules such as CO2 to more valuable hydrocarbons. Here, we investigate the materials chemistry of metal-organic framework (MOF) thin films grown on gold nanostructured microelectrodes (AuNMEs), focusing on the key materials chemistry challenges necessary to enable the applications of these MOF/AuNME composites in tandem catalysis. We applied two growth methods-layer-by-layer and solvothermal-to grow a variety of MOF thin films on AuNMEs and then characterized them using scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The MOF@AuNME materials were then evaluated for electrocatalytic CO2 reduction. The morphology and crystallinity of the MOF thin films were examined, and it was found that MOF thin films were capable of dramatically suppressing CO production on AuNMEs and producing further-reduced carbon products such as CH4 and C2H4. This work illustrates the use of MOF thin films to tune the activity of an underlying CO2RR catalyst to produce further-reduced products.

KEYWORDS:

CO2 reduction reaction; electrocatalysis; high-curvature nanostructures; metal−organic frameworks; tandem catalysis; thin films

PMID:
30129364
DOI:
10.1021/acsami.8b04848

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