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

Drialys Cardenas-Morcoso, Raya Ifraemov, Miguel García-Tecedor, Itamar Liberman, Sixto Gimenez, Idan Hod

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

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.

Original languageEnglish
Pages (from-to)11143-11149
Number of pages7
JournalJournal of Materials Chemistry A
Volume7
Issue number18
DOIs
StatePublished - 1 Jan 2019

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