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Self-assembled 2D WSe2 thin films for photoelectrochemical hydrogen production
Open accessAbstract
WSe 2—a layered semiconductor that can be exfoliated into atomically thin two-dimensional sheets—offers promising characteristics for application in solar energy conversion. However, the lack of controllable, cost-effective methods to scalably fabricate homogeneous thin films currently limits practical application. Here we present a technique to prepare controlled thin films of 2D WSe 2 from dispersions of solvent-exfoliated few-layer flakes. Flake self-assembly at a liquid/liquid interface (formed exceptionally from two non-solvents for WSe 2) followed by substrate transfer affords large-area thin films with superior 2D flake alignment compared with traditional (liquid/air) self-assembly techniques. We further demonstrate, for the first time, solar-to-hydrogen conversion from solution-processed WSe 2 thin films. Bare photoelectrodes with a thickness of ca. 25 nm exhibit sustained p-type photocurrent under simulated solar illumination, and up to 1.0 mA cm–2 at 0 V versus reversible hydrogen electrode with an added water reduction catalyst (Pt). The importance of the self-assembled morphology is established by photoelectrochemical and conductivity measurements.
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Metadata
- Authors
- Yu, X., Prévot, M. S., Guijarro, N., & Sivula, K.
- Venue
- Nature Communications
- Published
- 2015-07-01
- Volume
- 6
- Issue
- 1
- Pages
- 7596-7596
- ISSN
- 2041-1723 (ISSN-L)
- OpenAlex
- W1526026297
- Cited by
- 278
- References
- 34
- FWCI
- 12.12
- Type
- journal article
- Language
- en
- Open access
- gold
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