Photo-induced synthesis of ternary Pt/rGO/COF photocatalyst with Pt nanoparticles precisely anchored on rGO for efficient visible-light-driven H evolution.

Covalent organic frameworks (COFs) have been recognized as a new type of promising visible-light-driven photocatalysts for H evolution, while it still is a key point to facilitate the separation and transfer of photoinduced charges for further enhancing their activities. In this work, we fabricated a new type of ternary Pt/rGO/COF photocatalysts with Pt cocatalyst precisely anchored on rGO serving as electron collector for largely enhanced H evolution. A series of ternary hybrid materials were obtained via one-pot photoreduction of Pt and GO under visible-light irradiation in a solution the same as photocatalytic H evolution reaction and simultaneous self-assembling of rGO/COF heterostructure. No need isolation, the synthetic system could be further used for photocatalytic H evolution reaction and the results show the H evolution rate of Pt/rGO(20%)/TpPa-1-COF hybrid material is 19.59 mmol·g·h, 6.51 times higher than that of Pt/TpPa-1-COF. The essential role of the exclusively distributed Pt nanoparticles on rGO to the high H evolution activity was confirmed by various comparisons of activity for the samples with diverse Pt distribution.