Li, CB;
Chu, Y;
He, J;
Xie, J;
Liu, J;
Wang, N;
Tang, J;
(2019)
Photocatalytic Hydrogen Production Based on a Serial Metal-Salen Complexes and the Reaction Mechanism.
ChemCatChem
, 11
(24)
pp. 6324-6331.
10.1002/cctc.201901656.
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Abstract
KGaA, Weinheim Three metal-salen (Ni, Cu, Zn) complexes were firstly introduced into homogeneous photocatalytic hydrogen-evolution systems. Based on these complexes, we developed noble-metal-free hydrogen production systems using disodium salts of Eosin Y (EY2−) as photosensitizers and trimethylamine (TEA) as sacrificial donors. In a Ni(II)-salen/EY2−/TEA system, a TON of 362 based on Ni(II)-salen was achieved in 5.5 h with one time complement for EY2−. The stability study revealed the quick photodecomposition of EY2− in the presence of ether Ni(II)-salen, TEA or both chemicals, and quick dehalogenation of EY2− was observed in the presence of TEA under irradiation. Besides, relatively slower photodecomposition of Ni(II)-salen was also found. These factors should be responsible for the deactivation of the photolysis system. Investigation of electrocatalytic proton reduction by Ni(II)-salen showed a CECE mechanism. An overall catalytic rate constant of 7.62×106 M−2 s−1 was achieved. Combined with the stability analysis, photo-induced electron transfer and electrochemistry investigation, for the first time, the photocatalytic hydrogen production mechanism for metal-salen complexes (e. g. Ni(II)-salen) was proposed.
| Type: | Article |
|---|---|
| Title: | Photocatalytic Hydrogen Production Based on a Serial Metal-Salen Complexes and the Reaction Mechanism |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/cctc.201901656 |
| Publisher version: | http://doi.org/10.1002/cctc.201901656 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10085987 |
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