Spectral response and stability of In2S3 as visible light-active photocatalyst

Nanocrystalline In2S3 is shown to degrade photocatalytically aqueous formic acid using visible light. Its spectral response for this process is verified for the first time, showing that even photons with ≈ 650 nm are active. In2S3 is also shown to be more active and photocorrosion resistant in this process than similarly prepared CdS.

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► In2S3 nanoparticles are synthesized using a low-temperature hydrothermal method.
► In2S3 shows high activity to degrade formic acid under visible light irradiation.
► The photoactivity wavelength dependence is verified: even photons with λ ≈ 650 nm are active.
► The synthesized In2S3 has higher resistance to photocorrosion than CdS.