Title | Molybdenum Disulfide Catalytic Coatings via Atomic Layer Deposition for Solar Hydrogen Production from Copper Gallium Diselenide Photocathodes |
Publication Type | Journal Article |
Year of Publication | 2019 |
Authors | Hellstern TR, Palm DW, Carter J, DeAngelis AD, Horsley K, Weinhardt L, Yang W, Blum M, Gaillard N, Heske C, Jaramillo TF |
Journal | ACS Applied Energy Materials |
Volume | 2 |
Issue | 2 |
Pagination | 1060-1066 |
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. |
URL | https://doi.org/10.1021/acsaem.8b01562 |
DOI | 10.1021/acsaem.8b01562 |
Molybdenum Disulfide Catalytic Coatings via Atomic Layer Deposition for Solar Hydrogen Production from Copper Gallium Diselenide Photocathodes
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