An Oxygen-Insensitive Hydrogen Evolution Catalyst Coated by a Molybdenum-Based Layer for Overall Water Splitting
AuthorsGarcia Esparza, Angel T.
Anjum, Dalaver H.
Clo, Alain M.
KAUST DepartmentKAUST Catalysis Center (KCC)
Physical Sciences and Engineering (PSE) Division
Advanced Nanofabrication and Thin Film Core Lab
Imaging and Characterization Core Lab
Research Computing; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
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AbstractFor overall water-splitting systems, it is essential to establish O2 -insensitive cathodes that allow cogeneration of H2 and O2 . An acid-tolerant electrocatalyst is described, which employs a Mo-coating on a metal surface to achieve selective H2 evolution in the presence of O2 . In operando X-ray absorption spectroscopy identified reduced Pt covered with an amorphous molybdenum oxyhydroxide hydrate with a local structural order composed of polyanionic trimeric units of molybdenum(IV). The Mo layer likely hinders O2 gas permeation, impeding contact with active Pt. Photocatalytic overall water splitting proceeded using MoOx /Pt/SrTiO3 with inhibited water formation from H2 and O2 , which is the prevailing back reaction on the bare Pt/SrTiO3 photocatalyst. The Mo coating was stable in acidic media for multiple hours of overall water splitting by membraneless electrolysis and photocatalysis.
CitationGarcia-Esparza AT, Shinagawa T, Ould-Chikh S, Qureshi M, Peng X, et al. (2017) An Oxygen-Insensitive Hydrogen Evolution Catalyst Coated by a Molybdenum-Based Layer for Overall Water Splitting. Angewandte Chemie International Edition 56: 5780–5784. Available: http://dx.doi.org/10.1002/anie.201701861.
SponsorsThe research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). Pavel Afanasiev is kindly acknowledged for sharing reference spectra recorded at the Mo K-edge. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.