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In2S3-bonded laccase as photoelectrode for H2O oxidation to O2

AutorTapia, Cristina; Shleev, Sergey; Conesa Cegarra, José Carlos ; Lacey, Antonio L. de; Pita, Marcos
Fecha de publicaciónnov-2017
Citación11th EERA JP AMPEA Steering Committee & workshop (2017)
ResumenWe showed earlier photocatalytic H2 generation irradiating a hydrogenase-In2S3 combination. a We report now recent results1b of photoelectrochemical evolution of O2 from water using as light absorber In2S3, a semiconductor with bandgap Eg=2.0 eV capable of photocatalysis with λ<650 nm light, a and as co-catalyst the enzyme Trametes Laccase (ThLc), able to electrochemically oxidize water to O2.In2S3 powder was laid on a FTO electrode and ThLc was bonded to it via aminophenyl groups. An O2 sensor located near the electrode could detect O2 (without simultaneous production of H2O2) during voltammograms when irradiated in aqueous solution buffered at pH=7.1 (Fig. 1b); control tests showed that In2S3, light and covalently bonded ThLc were all needed for O2 formation. Overpotential decrease by >0.7 V was found, and calibration of the O2 sensor evidenced faradaic efficiencies of 45% (some photo-corrosion probably occurred). This is the first time that enzyme-catalyzed O2 formation is seen upon visible light irradiation of a semiconductor, and shows high promise since V-doped In2S3 has shown ability to couple two low energy photons to achieve a photocatalytically active higher energy electron excitation,2b like in photosynthesis Z-scheme.
DescripciónTrabajo presentado en el 11th EERA JP AMPEA Steering Committee & workshop ("Photo- and Electro- Catalysis in Energy Conversion"), celebrado en Praga el 20 y 21 de noviembre de 2017.
URIhttp://hdl.handle.net/10261/163970
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