Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 51, Pages 35281-35288Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12031
Keywords
electrocatalysts; g-C3N4; metal-organic frameworks; oxygen reduction reaction; porous materials
Funding
- National Natural Science Foundation of China [21190040, 21427811]
- Most China [2016 YFA 0203200]
- Youth innovation promotion Association CAS [2016208]
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A highly active electrocatalyst in the whole pH range for oxygen reduction reaction (ORR) is produced by employing the g-C3N4 assisted metal organic frameworks (MOF) of C3N4@NH2-MIL-101 as the precursor. By pyrolyzing the hybrid at 700 degrees C, the C3N4@NH2-MIL-101 could be easily transformed into an abundant iron and nitrogen codoped porous carbon skeleton. The selective use of g-C3N4 as a support template plays a critical role in facilitating the formation of the architecture with high surface area and rich N content. The obtained catalyst of C3N4@NH2-MIL-101-700 manifested remarkable oxygen reduction activity over the pH 0-14. Noteworthy, the catalyst displayed outstanding ORR activity with more positive half-wave potential than that of the commercial Pt/C catalyst in both alkaline and neutral conditions. Additionally, the optimal C3N4@NH2-MIL-101-700 also exhibited prominent ORR activity which is almost equal to that of commercial Pt/C in acidic electrolyte with high selectivity and very low H2O2 yield. Most importantly, the better methanol tolerance and much higher stability than the commercial Pt/C of C3N4@NH2-MIL-101-700 no matter under alkaline, neutral, or acid conditions further demonstrate the catalyst to be a promising candidate for practical electrocatalytic applications.
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