Photocatalytic Conversion of Diluted CO into Tunable Syngas via Modulating Transition Metal Hydroxides.

The conversion of diluted CO into tunable syngas via photocatalysis is critical for implementing CO reduction practically, although the efficiency remains low. Herein, we report the use of graphene-modified transition metal hydroxides, namely, NiCo-GR, for the conversion of diluted CO into syngas with adjustable CO/H ratios, utilizing Ru dyes as photosensitizers. The Ni(OH)-GR cocatalyst can generate 12526 μmol g h of CO and 844 μmol g h of H, while the Co(OH)-GR sample presents a generation rate of 2953 μmol g h for CO and 10027 μmol g h for H.

Integrating Co(OH) nanosheet arrays on graphene for efficient noble-metal-free EY-sensitized photocatalytic H evolution.

The development of an efficient noble-metal-free cocatalyst is the key to photocatalytic hydrogen production technology. In this study, hierarchical Co(OH) nanosheet array-graphene (GR) composite cocatalysts are developed. With Eosin Y (EY) as a photosensitizer, the optimal Co(OH)-10%GR hybrid cocatalyst presents excellent photocatalytic activity with an H production rate of 17 539 μmol g h, and the apparent quantum yield for hydrogen production can reach 12.