| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Photocatalytic Hydrogen Production Performance and Mechanism Exploration of a Binuclear Cobalt Catalyst |
| ZHENG Huiqin
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| Department of Chemistry and Environment, Henan Finance University, Zhengzhou 450046, China |
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Abstract Anew binuclear cobalt molecular catalyst, namely [Co2(dmgH)4(μ-4,4′-bpy)Cl2](1), had been synthesized by the reaction of [Co-(dmgH)(dmgH2)Cl2] with 4,4′-bipyridine(μ-4,4′-bpy). Its structure and properties were characterized by IR,1H NMR, CV, fluorescence, etc. An efficient homogeneous photocatalytic system was constructed by combination of noble-metal-free cobalt complex as catalyst, Eosin Y (EY2-) dye as photosensitizer and TEOA as sacrificial reagent under visible-light irradiation (λ>420 nm). The maximum H2 yield of (1 488.3±34.5 μmol) ((160.0±3.7) TON vs. 1) and H2 evolution rate of (744.2±17.3) μmol·h-1 were recorded under the optimal conditions with 1 of 3.7×10-4 mol·L-1, EY2- of 4×10-4 mol·L-1, TEOA of 20% (v/v) and pH of 10 in 2 h irradiation. Furthermore, the mechanism of H2 evolution in the homogeneous photolysis system was also briefly discussed. The electron transfer from the excited 1*EY2- to Co catalytic center of complex 1 in the designed system was also confirmed to be thermodynamic feasible.
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Published: 29 May 2020
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| Fund:This work was financially supported by the Natural Science Foundation of China (21171147), Science and Technology Project of Henan Province, China (182102210279), Teacher Education Curriculum Reform Research Key Research Project of Henan Province (2018-JSJYZD-035). |
| About author:: Huiqin Zheng received her Ph.D. degree in materials from Zhengzhou University in 2015. She is currently an associate professor in Department of Chemistry and Environment, Henan Finance University. Her research is mainly focus on photo-catalytic hydrogen production. |
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2020, Vol. 34 
