Photoelectrochemical cells using polycrystalline and thin film MoS2 electrodes

Geula Djemal, Norbert Müller, Uri Lachish, David Cahen

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Using well-crystallized starting materials, polycrystalline electrodes of MoS2 are found to give significant photoresponse in aqueous polyiodide. Best results are obtained with multicrystalline lumps affixed to metal substrates; pressed pellets reach about 30% of the output of these former ones. Thin polycrystalline films, prepared by flux annealing of pasted films show some photoresponse, which can be improved by more than an order of mangitude if an organic polymer binder is used in the preparation and retained by low temperature annealing. Such electrodes reach 50% of the output of pressed pellets. The action of the organic polymer seems to be twofold: orientation of crystallites, and some passivation of exposed edges on the electrode surface. While prolonged use of these photoelectrodes, as well as short use at higher temperatures, decreases their output, the original activity can be nearly restored by renewed low temperature annealing. The wavelength dependence of the photoresponse of these electrodes shows that those using a polymer matrix approach that of single crystals most closely.

Original languageEnglish
Pages (from-to)403-416
Number of pages14
JournalSolar Energy Materials
Volume5
Issue number4
DOIs
StatePublished - Oct 1981
Externally publishedYes

Funding

Part of this work was begun at the Fritz Haber Institute in Berlin, and supported there by the European Communities Energy R&D program. Partial support by the US-Israel Binational Science Foundation, Jerusalem, Israel, is gratefully acknowledged. We thank H. Gerischer and A. Wold for stimulating discussions and A. Wold and F. L6vy for single crystals, and F. Buchholz and Y. Mirovsky for assistance with some of the experiments.

FundersFunder number
US-Israel Binational Science Foundation

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