期刊
APPLIED CATALYSIS A-GENERAL
卷 510, 期 -, 页码 156-160出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2015.11.009
关键词
Tungsten disulfide; Electrocatalyst; Pulsed laser deposition; Hydrogen evolution reaction
资金
- PAT (Provincia Autonoma di Trento) project ENAM
- Istituto PCB of CNR (Italy)
- U.S.-Italy Fulbright Commission
Replacement of platinum with cheap and abundant materials is a key step to enable the large scale application of water splitting schemes to produce hydrogen. Tungsten disulfide, a metal dichalcogenide showing catalytic activity toward the hydrogen evolution reaction (HER), is rapidly emerging as a cost effective alternative. In this paper we report the synthesis of WS2 thin films with pulsed laser deposition (PLD), a versatile technique which combined with thermal treatments allows us to investigate the correlation between key material properties, such as crystallinity and morphology, with HER catalysis performance. Following FESEM, XRD, Raman and electrochemical characterization, we link increased activity with higher crystallinity, different from recently reported results for related materials such as MoS2. An annealing temperature of 500 degrees C yields a markedly low onset potential of 160 mV relative to Pt metal and the introduction of nanostructuring proves a successful strategy for current density enhancement. (C) 2015 Elsevier B.V. All rights reserved.
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