Cobalt single-atoms anchored on porphyrinic triazine-based frameworks as bifunctional electrocatalysts for oxygen reduction and hydrogen evolution reactions

Designing and fabrication of highly active single-atom catalysts (SACs) with maximized atomic efficiency is highly desirable but still remains a great challenge. Herein, highly active and stable cobalt single-atoms with a Co–N 4 moiety were uniformly anchored on a porous porphyrinic triazine-based f...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (3), p.1252-1259
Main Authors: Yi, Jun-Dong, Xu, Rui, Chai, Guo-Liang, Zhang, Teng, Zang, Ketao, Nan, Bing, Lin, Hua, Liang, Yu-Lin, Lv, Jiangquan, Luo, Jun, Si, Rui, Huang, Yuan-Biao, Cao, Rong
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Chemical reduction
Cobalt
Durability
Electrocatalysts
Electrolytic cells
Fabrication
Fuel cells
Fuel technology
Hydrogen evolution reactions
Oxygen
Oxygen reduction reactions
Single atom catalysts
Structural hierarchy
Triazine
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Summary:Designing and fabrication of highly active single-atom catalysts (SACs) with maximized atomic efficiency is highly desirable but still remains a great challenge. Herein, highly active and stable cobalt single-atoms with a Co–N 4 moiety were uniformly anchored on a porous porphyrinic triazine-based framework (CoSAs/PTF) by a simple ionothermal method. Due to the abundant single-atom Co–N 4 species, the hierarchical porous structure and the good conductivity, the resultant catalyst is highly active for the electrocatalytic oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER). For the ORR, a more positive half-wave potential of 0.808 V ( vs. RHE) was achieved, compared with commercial benchmark Pt/C (0.806 V). Furthermore, a small onset potential of 21 mV and a low Tafel slope of 50 mV per decade were obtained for the HER. The porphyrin-like structure was found to stabilize the CoSAs effectively, thus leading to long-term durability and a remarkable methanol-tolerant behavior. This bifunctional single-atom catalyst might be a promising candidate to replace Pt-based electrocatalysts in electrolysers and fuel cells.
ISSN:2050-7488
2050-7496
DOI:10.1039/C8TA09490J