A mesoporous carbon derived from 4,4′-dipyridyl iron as an efficient catalyst for oxygen reduction
2020
Gao, Xiaohong | Li, Xiaobao | Wang, Qingqing | You, Chenghang | Tian, Xinlong | Wang, Chongtai | Hua, Yingjie | Liao, Shijun
Developing highly active and low cost catalysts for oxygen reduction is crucial for the commercialization of advanced energy systems. In this work, a mesoporous carbon was fabricated through a simple pyrolysis procedure by using 4′4-bipyridyl, FeCl₃ and SBA-15 as the precursors and templates, respectively. The catalyst exhibits rather high ORR performance, with a half-wave potential of 0.906 V (vs. RHE). The catalyst also demonstrates outstanding stability, excellent methanol tolerance and high selectivity towards the four-electron path. The air electrode fabricated by using the catalyst can enable a zinc–air battery to deliver a specific capacity of 815.6 mA h gZₙ⁻¹ and a maximum power density of 196.3 mW cm⁻², which are among the highest values recently reported, to our knowledge. By comparing the catalysts obtained at different temperatures, we found that the increased graphitic N content together with the higher surface area should be the reasonable origins of the outstanding performance.
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