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La5 Ti2 Cu0.9 Ag0.1 S5 O7 Modified with a Molecular Ni Catalyst for Photoelectrochemical H2 Generation.

ABSTRACT: The stable and efficient integration of molecular catalysts into p-type semiconductor materials is a contemporary challenge in photoelectrochemical fuel synthesis. Here, we report the combination of a phosphonated molecular Ni catalyst with a TiO2 -coated La5 Ti2 Cu0.9 Ag0.1 S5 O7 photocathode for visible light driven H2 production. This hybrid assembly provides a positive onset potential, large photocurrents, and high Faradaic yield for more than three hours. A decisive feature of the hybrid electrode is the TiO2 interlayer, which stabilizes the oxysulfide semiconductor and allows for robust attachment of the phosphonated molecular catalyst. This demonstration of an oxysulfide-molecular catalyst photocathode provides a novel platform for integrating molecular catalysts into photocathodes and the large photovoltage of the presented system makes it ideal for pairing with photoanodes.

SUBMITTER: Rosser TE 

PROVIDER: S-EPMC6348378 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature

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La<sub>5</sub> Ti<sub>2</sub> Cu<sub>0.9</sub> Ag<sub>0.1</sub> S<sub>5</sub> O<sub>7</sub> Modified with a Molecular Ni Catalyst for Photoelectrochemical H<sub>2</sub> Generation.

Rosser Timothy E TE   Hisatomi Takashi T   Sun Song S   Antón-García Daniel D   Minegishi Tsutomu T   Reisner Erwin E   Domen Kazunari K  

Chemistry (Weinheim an der Bergstrasse, Germany) 20180606 69

The stable and efficient integration of molecular catalysts into p-type semiconductor materials is a contemporary challenge in photoelectrochemical fuel synthesis. Here, we report the combination of a phosphonated molecular Ni catalyst with a TiO<sub>2</sub> -coated La<sub>5</sub> Ti<sub>2</sub> Cu<sub>0.9</sub> Ag<sub>0.1</sub> S<sub>5</sub> O<sub>7</sub> photocathode for visible light driven H<sub>2</sub> production. This hybrid assembly provides a positive onset potential, large photocurrents  ...[more]

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