Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Main group sulphides such as In2S3, SnS2 or ZnIn2S4, with bandgaps in the 2.0-2.2 eV range, can use significant amounts of visible light. So we have shown in earlier studies of their photocatalytic response, evidencing that they are active in the oxidative photodegradation of aqueous HCOOH with photons having wavelengths ≤ 650 nm. In addition, they are more photoactive in the same reaction than the typical reference compound CdS, and the first two (especially SnS2) are also more resistant to photocorrosion in oxidative environments than the same photocatalyst CdS, as shown by the analysis of sulphide components detected in solution after prolonged photocatalysis.
More recently we have undertaken the study of their combination with enzymes for photoinduced water splitting. Thus, combining In2S3 with a hydrogenase enzyme allowed the photocatalytic generation of H2 using a sacrificial agent [1]; the results suggested furthermore that the process was not limited by the transfer of electrons from the semiconductor to the enzyme. Later we have verified, for the first time ever, the photoelectrochemical generation of O2 coupling a laccase-type enzyme with these sulphides; first with In2S3 [2] and later with SnS2 [3]. It could be shown that a substantial decrease in the overvoltage needed was found in the presence of light. There were some problems with the stability of these enzymes in these O2 generation conditions; as expected, SnS2 could be shown to be more stable than In2S3.
A summary of all the mentioned results will be presented here.
•Funding of different phases of this work by Spanish National Plan projects ENE2013-46624-C4-1-R, CTQ2015-71290-R, ENE2016-77798-C4-1-R & RTI2018-095090-B-100; regional projects S2018/NMT-4367 & P2018/NMT-4367; Swedish Energy Agency project 44707-1; portuguese grants UID/Multi/04551/2013 and PTDC/BBB-BEP/2885/2014; and European project FP7-PEOPLE-2013-ITN-607793 is acknowledged. C.J., C.T., S.Z. and R.L give thanks also for their PhD contracts.
•Thanks are given to CSIC computer centre for access to parallel supercomputer trueno
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