趙學波教授科研團隊的最新科研成果“High oxygen reduction activity on a metal–organic framework derived carbon combined with high degree of graphitization and pyridinic-N dopants”, 近日在Journal of Materials Chemistry A在線發表。
http://pubs.rsc.org/en/content/articlelanding/2017/ta/c6ta08016b#!divAbstract
DOI：DOI: 10.1039/C6TA08016B, Paper
該項工作由李良軍博士和代鵬程副教授為共同一作，趙學波教授為通訊作者，團隊的顧鑫博士和博士研究生王穎和閆理停參與了本項研究工作。該工作揭示了MOF碳的石墨化程度和六元環吡啶氮的含量以及MOF碳的孔結構三者協同作用對氧還原（ORR）催化性能具有明顯的提成作用。本研究制備的材料性能和商業10%Pt碳相當，具有很好的應用前景。
摘要：
N-doped porous carbons have been considered as one of the most promising earth-abundant catalysts for the oxygen reduction reaction (ORR) owing to their high activity and excellent stability. Among various types of N-containing groups, pyridinic-N has been identified as the
most effective catalytic sites for the ORR, as demonstrated by a recent study. However, the fabrication of porous carbons with a high density of exposed pyridinic-N sites has been rarely reported. In this work, the ORR catalytic properties of a series of pyridinic-N doped porous carbon (PNPC) which was derived by carbonization of a pyridyl-ligand based MOF were investigated. At different carbonization temperatures, this series of carbon exhibits different
pyridinic-N contents and different degrees of carbonization. The ORR studies show that the graphitization degree of carbon has a significant impact on ORR catalytic activity besides N-groups. Electrochemical impedance spectroscopy (EIS) reveals that the electron transfer resistance in the ORR decreases significantly with the higher degree of graphitization, which gives rise to a higher ORR activity for these PNPCs. The synergistic effect of the high density
of pyridinic-N sites and decreased electron impedance results in remarkably improved ORR activity which is comparable with that of the commercial Pt/C (10 wt%) catalyst. The result of this work could provide some guidance for designing or synthesizing highly efficient ORR catalysts.
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