Substituent position effect of Co porphyrin on oxygen electrocatalysis
| Autor: | Hongbo Guo, Wei Zhang, Haoyuan Lv, Haitao Lei, Haoquan Zheng, Zuozhong Liang, Kai Guo, Rui Cao |
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| Rok vydání: | 2021 |
| Předmět: |
Substituent
Oxygen evolution chemistry.chemical_element 02 engineering and technology General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry Electrocatalyst 01 natural sciences Porphyrin Oxygen 0104 chemical sciences law.invention Catalysis chemistry.chemical_compound chemistry law 0210 nano-technology Bifunctional |
| Zdroj: | Chinese Chemical Letters. 32:2841-2845 |
| ISSN: | 1001-8417 |
| Popis: | Substituent effect of metal porphyrin molecular catalysts plays a crucial role in determining the catalytic activity of oxygen electrocatalysis. Herein, substituent position effect of Co porphyrins on oxygen electrocatalysis, including the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), was investigated. Two Co porphyrins, namely 2,4,6-OMe-CoP and 3,4,5-OMe-CoP, were selected as the research objects. The ORR and OER performance was evaluated by drop-coating molecular catalysts on carbon nanotubes (CNTs). The resulted 3,4,5-OMe-CoP/CNT exhibited high bifunctional electrocatalytic activities and better long-term stability for both ORR and OER than 2,4,6-OMe-CoP/CNT. Furthermore, when applied in the Zn-air battery, 3,4,5-OMe-CoP/CNT exhibited comparable performance to that with precious metal-based materials. The enhanced catalytic activity may be attributed to the improved charge transfer rate, mass transfer and hydrophilicity. This work provides an effective strategy to further enhance catalytic activity by introducing substituent position effect, which is of great importance for developing more efficient energy-related electrocatalysts. |
| Databáze: | OpenAIRE |
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