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Triplet–Triplet Annihilation Upconversion for Photocatalytic Hydrogen Evolution
Author(s) -
Yu Tianjun,
Liu Yanpeng,
Zeng Yi,
Chen Jinping,
Yang Guoqiang,
Li Yi
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904025
Subject(s) - photon upconversion , hydrogen production , annihilation , cyan , materials science , photon , hydrogen , optoelectronics , water splitting , photochemistry , photocatalysis , optics , physics , chemistry , doping , nuclear physics , biochemistry , quantum mechanics , catalysis
Abstract The solar generation of hydrogen by water splitting provides a promising path for renewable hydrogen production and solar energy storage. Upconversion of low‐energy photons into high‐energy photons constitutes a promising strategy to enhance the light harvesting efficiency of artificial hydrogen production systems. In the present study, upconversion micelles are integrated with Cd 0.5 Zn 0.5 S to construct solar energy conversion systems. The upconversion micelle is employed to upconvert red photons to cyan photons. Cd 0.5 Zn 0.5 S is sensitized by upconverted cyan light to produce hydrogen, but not by incident red light without triplet–triplet annihilation upconversion (TTA‐UC). The performance of the upconversion photocatalytic system was dramatically affected by the concentration of Cd 0.5 Zn 0.5 S and the irradiation intensity. This novel system was able to produce about 2.3 μL hydrogen after 5 h of red light (629 nm) irradiation (2.4 mW cm −2 ). The present study provides a candidate for applications using low‐energy photons for solar hydrogen generation.