Affiliation:
1. School of Chemistry and Chemical Engineering Guangdong Provincial Key Laboratory of Fuel Cell Technology South China University of Technology Guangzhou 510641 P. R. China
2. School of Materials Science and Energy Engineering Foshan University Foshan 528000 P. R. China
3. Department of Chemistry Michigan State University E. Lansing MI 48824 USA
Abstract
AbstractThree isomeric A2B‐type new cobalt triaryl corroles bearing hydroxyphenyl substituents have been prepared and well characterized. Their activity and stability in the electrocatalytic hydrogen evolution reaction (HER) have been investigated. The results showed that the hydroxyl position of the phenyl group had significant influence on electrocatalytic HER. The ortho‐hydroxyphenyl substituted cobalt corrole (1) core displays the best HER activity using TsOH proton source, and the turnover frequency (TOF) and catalytic efficiency (C.E) reach 318.68 s−1 and 1.13, respectively. Moreover, a turnover number (TON) of 1447.39 and Faraday efficiency (FE) of 98.7 % have been observed in aqueous medium. The catalytic pathway is via EECEC, EECC or ECEC pathways depending on the acidity of acid proton source (E: electron transfer step, C: chemical step, in this case protonation). The catalytic HER performance of these cobalt corroles follows an order of o‐hydroxyl > p‐hydroxyl > m‐hydroxyl isomer, showing the o‐ and p‐hydroxyl of the phenyl groups are more efficient in accelerating proton relay.
Funder
National Natural Science Foundation of China
Cited by
2 articles.
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