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Issue 18, 2019
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A metal–organic framework converted catalyst that boosts photo-electrochemical water splitting

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Abstract

Realization of photo-electrochemical water splitting to generate H2 alternative fuel requires the facilitation of the kinetically-sluggish oxygen evolution reaction (OER) occurring at the photoanode. To do so, there is a need to develop new methods to assemble suitable OER co-catalysts at the semiconductor–solution interface. Although Metal–Organic Frameworks (MOFs) are frequently used as precursor materials to synthesize high surface area, effective OER electrocatalysts, until now their utilization as co-catalysts in a working photo-electrochemical cell (PEC) has remained underexplored. As a proof-of-concept, here we provide a simple route for modification of BiVO4-based photoanodes with highly-active porous cobalt-oxide co-catalysts, converted from a cobalt–imidazolium MOF (ZIF-67). Photo-electrochemical and impedance spectroscopy analysis reveal that the co-catalyst significantly accelerates photoanodic OER (rather than serving as a surface passivation layer), and thus greatly improves the overall PEC performance. Hence, given the chemical flexibility of MOFs, this work provides a new tool-kit for designing efficient water splitting PECs.

Graphical abstract: A metal–organic framework converted catalyst that boosts photo-electrochemical water splitting

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Supplementary files

Article information


Submitted
11 Feb 2019
Accepted
05 Apr 2019
First published
08 Apr 2019

J. Mater. Chem. A, 2019,7, 11143-11149
Article type
Paper

A metal–organic framework converted catalyst that boosts photo-electrochemical water splitting

D. Cardenas-Morcoso, R. Ifraemov, M. García-Tecedor, I. Liberman, S. Gimenez and I. Hod, J. Mater. Chem. A, 2019, 7, 11143
DOI: 10.1039/C9TA01559K

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