Published May 15, 2017 | Version v1
Journal article Metadata-only

An oxygen-insensitive hydrogen evolution catalyst coated by a molybdenum-based layer for overall water splitting

Creators

  • 1. KAUST Catalysis Center (KCC) and Physical Science and Engineering Division - PSE, King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)
  • 2. Advanced Nanofabrication, Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)
  • 3. Research Computing, King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)
  • 4. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  • 5. Stanford Synchrotron Radiation Lightsource, Menlo Park, CA (United States)
  • 6. Department of Chemical Engineering, Fukuoka University (Japan)
  • 7. Department of Chemical System Engineering, School of Engineering, The University of Tokyo (Japan)

Description

For 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. (copyright 2017 Wiley-VCH Verlag GmbH and Co. KGaA, Weinheim)

Availability note (English)

Available from: http://dx.doi.org/10.1002/anie.201701861

Additional details

Identifiers

DOI
10.1002/anie.201701861;

Publishing Information

Journal Title
Angewandte Chemie (International Edition)
Journal Volume
56
Journal Issue
21
Journal Page Range
p. 5780-5784
ISSN
1433-7851
CODEN
ACIEF5

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
48053182
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; S08: HYDROGEN;
Descriptors DEI
ABSORPTION SPECTROSCOPY; DECOMPOSITION; ELECTROCATALYSTS; HYDROGEN PRODUCTION; LAYERS; MOLYBDENUM HYDROXIDES; PHOTOCATALYSIS; PLATINUM; STRONTIUM TITANATES; SURFACE COATING; VOLTAMETRY; WATER
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; CATALYSIS; CATALYSTS; CHEMICAL REACTIONS; DEPOSITION; ELEMENTS; HYDROGEN COMPOUNDS; HYDROXIDES; METALS; MOLYBDENUM COMPOUNDS; OXYGEN COMPOUNDS; PLATINUM METALS; REFRACTORY METAL COMPOUNDS; SPECTROSCOPY; STRONTIUM COMPOUNDS; TITANATES; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS

Optional Information

Notes
With 4 figs., 26 refs.