Transition metal tetrapentafluorophenyl porphyrin catalyzed hydrogen evolution from acetic acid and water |
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Authors: | Dong-Xu Zhang Hui-Qing Yuan Hua-Hua Wang Atif Ali Wei-Hong Wen An-Na Xie Shu-Zhong Zhan Hai-Yang Liu |
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Institution: | 1.Department of Chemistry, Key Laboratory of Functional Molecular Engineering of Guangdong Province,South China University of Technology,Guangzhou,China |
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Abstract: | The performance of Cu (1), Co (2) and Zn (3) complexes of meso-tetrakis(pentafluorophenyl)porphyrin in the electrocatalyzed evolution of hydrogen has been investigated. In acetic acid media, hydrogen evolution turnover frequency (TOF) values for complexes 1, 2 and 3 were 22.1, 19.8 and 18.1 h?1, respectively, at an overpotential of 942 mV versus Ag/AgNO3. In buffer solution at pH 7.0, the corresponding hydrogen evolution TOF values increased dramatically, to 266, 234, 218 h?1 at a similar overpotential of 878 mV versus SHE. The Faradaic yields of 1, 2, and 3 for sustained proton reduction in catalytic experiments at a glassy carbon electrode over 72 h were 89.7, 90.4 and 91.0%, respectively, with no observable catalyst decomposition. |
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