Journal
JOURNAL OF MATERIALS RESEARCH
Volume 33, Issue 5, Pages 528-537Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2017.431
Keywords
alloy; catalytic; water
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Funding
- SNSF NRP 70 project [407040 154056]
- European Commission [H2020-ICT-2014-1, 643791]
- Swiss State Secretariat for Education, Research, and Innovation (SERI)
- CTI [15864.2 PFNM-NM]
- Solaronix, Aubonne, Switzerland
- HZB-HU Graduate School hybrid4energy
- [563074]
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Intercalated and unmodified TiS2 nanomaterials were synthesized and characterized by UV-Visible-NIR spectroscopy, Powder X-Ray Diffraction, and X-Ray Photoelectron and Ultraviolet Photoelectron Spectroscopy. Photoelectron spectroscopy measurements indicated that CoS and Cu2S appeared to be intercalated between sheets of partially or fully oxidized TiS2, which could be solution processed on conductive oxide substrates. The materials were then applied toward water oxidation and evaluated by cyclic voltammetry, chronoamperometry, and impedance measurements. While unmodified TiS2 was not observed to perform well as an electrocatalyst with overpotentials >3 V in 1 M NaOH electrolyte, CoS intercalation was found to lower the overpotential by approximate to 1.8-1.44 V at 10 mA/cm(2). Conversely, Cu2S intercalation resulted in only a modest increase in performance (>2.3 V overpotential). Impedance measurements indicated that intercalation increased the series resistance in the as-prepared samples but decreased the series resistance in oxidized samples.
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