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A Highly Active Hierarchically Porous Mn-N-C Catalyst for Oxygen Reduction

SSRN, ISSN: 1556-5068
2024
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Article Description

A highly effective ORR catalyst with a sophisticated multi-level porous structure is successfully crafted utilizing Mn2+ coordinated to 4,4'-bipyridine as the precursor and SBA-15 as the mesoporous template. The catalyst demonstrates exceptional ORR performance in a 0.1 M KOH solution, achieving a half-wave potential of 0.91 V, which surpasses the performance of other recently reported Mn-based catalysts and ranks among the most active non-precious carbon-based ORR catalysts known. Furthermore, the catalyst exhibits remarkable resistance to methanol poisoning and maintains stable operation for an impressive duration of 20,000 seconds without experiencing significant performance decline. Notably, during catalysis, the catalyst's selectivity for the four-electron transfer pathway is close to 100%, with peroxide yield lower than 5%. When functioning as the catalyst for the air electrode of a zinc-air battery, it exhibits a peak power density and specific capacity of 205.9 mW cm-2 and 813.8 mAh g-1Zn, respectively. The outstanding performance and durability of this catalyst make it well-suited for practical applications and commercial use. We also contend that the approach presented here can be readily adapted to the rational design and fabrication of ORR catalysts, which are characterized by both high activity and stability, thereby contributing to eco-friendly and forward-thinking energy technologies.

Bibliographic Details

Xiaobao Li; Li Tang; Wei Sun; Chenghang You

Elsevier BV

Multidisciplinary; Oxygen reduction; Zinc-air battery; highly active catalyst; Mn-based carbon catalyst; Hierarchical porous

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