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Synthesis of cobalt A2B triaryl corroles bearing methoxy or hydroxyl groups and their activity in electrocatalytic hydrogen evolution |
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| Authors: | Zheng-Mei Zhu Wei-Yu Peng Wu Yang Chen Ling Hao Zhang Li-Ping Si Hai-Yang Liu |
| Affiliation: | 1. School of Chemistry and Chemical Engineering, Guangdong Provincial Key Laboratory of Fuel Cell Technology, South China University of Technology, Guangzhou, China;2. School of Chemistry and Chemical Engineering, Guangdong Provincial Key Laboratory of Fuel Cell Technology, South China University of Technology, Guangzhou, China Contribution: Data curation (supporting), Formal analysis (equal), Methodology (supporting);3. School of Chemistry and Chemical Engineering, Guangdong Provincial Key Laboratory of Fuel Cell Technology, South China University of Technology, Guangzhou, China Contribution: Formal analysis (supporting), Investigation (supporting);4. School of Chemistry and Chemical Engineering, Guangdong Provincial Key Laboratory of Fuel Cell Technology, South China University of Technology, Guangzhou, China Research and Technical Services Office, Guangdong Industry Polytechnic, Guangzhou, China Contribution: Conceptualization (supporting), Data curation (supporting), Formal analysis (supporting);5. School of Chemistry and Chemical Engineering, Guangdong Provincial Key Laboratory of Fuel Cell Technology, South China University of Technology, Guangzhou, China Contribution: Conceptualization (supporting), Supervision (supporting), Visualization (supporting);6. School of Materials Science and Energy Engineering, Foshan University, Foshan, China |
| Abstract: | Four A2B cobalt corrole complexes 1 – 4 appending two methoxy or hydroxyl groups on the 10-meso phenyl group had been synthesized. Four cobalt corroles showed high electrocatalytic activity for hydrogen evolution reaction (HER) in the organic phase and in the aqueous phase. The hydrogen evolution pathway was EECEC when using acetic acid as proton source. When trifluoroacetic acid was used as proton source, the hydrogen evolution route via EECEC or EECC depending on the concentration of trifluoroacetic acid. Cobalt corrole 4 showed the best HER performance with the kobs of 122.68 s−1 in organic phase and the TOF of 832.2 h−1 in aqueous phase respectively. The results suggested the phenyl hydroxyl group at the cobalt corrole peripheral may act as the proton relay group in HER and the o-hydroxyl of phenyl was better than m- hydroxyl for proton relay. |
| Keywords: | cobalt corrole electrocatalysis hydrogen evolution |