journal article·2019-02-25Open access

Molybdenum Disulfide Catalytic Coatings via Atomic Layer Deposition for Solar Hydrogen Production from Copper Gallium Diselenide Photocathodes

Thomas R. Hellstern, David W. Palm, James Carter, Alex D. DeAngelis, Kimberly Horsley, Lothar Weinhardt, Wanli Yang, Monika Blum, Nicolas Gaillard, Clemens Heske, Thomas F. Jaramillo

ACS Applied Energy Materials· Volume 2· Issue 2

Abstract

We demonstrate that applying atomic layer deposition-derived molybdenum disulfide (MoS2) catalytic coatings on copper gallium diselenide (CGSe) thin film absorbers can lead to efficient wide band gap photocathodes for photoelectrochemical hydrogen production. We have prepared a device that is free of precious metals, employing a CGSe absorber and a cadmium sulfide (CdS) buffer layer, a titanium dioxide (TiO2) interfacial layer, and a MoS2 catalytic layer. The resulting MoS2/TiO2/CdS/CGSe photocathode exhibits a photocurrent onset of +0.53 V vs RHE and a saturation photocurrent density of −10 mA cm–2, with stable operation for >5 h in acidic electrolyte. Spectroscopic investigations of this device architecture indicate that overlayer degradation occurs inhomogeneously, ultimately exposing the underlying CGSe absorber.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Chalcogenide Semiconductor Thin Films · Advanced Photocatalysis Techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, California 94305, United States

Department of Chemistry and Biochemistry, University of Nevada Las Vegas (UNLV), 4505 Maryland Pkwy, Las Vegas, Nevada 89154-4003, United States

Hawaii Natural Energy Institute (HNEI), University of Hawaii at Manoa, 1680 East-West Rd, POST 109, Honolulu, Hawaii 96822, United States

Institute for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT), Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstr. 18/20, 76128 Karlsruhe, Germany

Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States

SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States

Funding

Basic Energy Sciences · Division of Graduate Education · Office of Energy Efficiency and Renewable Energy

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