sj-pdf-1-imr-10.1177_03000605211044358 - Supplemental material for Cryptogenic hemoptysis caused by isolated aortopulmonary collateral artery formation: a case report

Supplemental material, sj-pdf-1-imr-10.1177_03000605211044358 for Cryptogenic hemoptysis caused by isolated aortopulmonary collateral artery formation: a case report by Yuan Lang, Chao Sun, Xiaoyan Dong, Yongshuang Fang and Zeyu Zeng in Journal of International Medical Research</p

Fluorine-doped graphene with outstanding electrocatalytic performance for highly efficient oxygen reduction reaction in alkaline solution

Doping carbon materials have proved to be the front runners to substitute for Pt as oxygen reduction reaction (ORR) catalysts. Fluorine-doped graphene (FG) has rarely been used as ORR catalyst because of the difficulty in preparation. Herein, we report FG sheets prepared by a thermal pyrolysis GO process in the presence of zinc fluoride (ZnF2) as an efficient electrocatalyst for ORR in the alkaline medium. The results show that the pyrolysis temperature seriously affected the doped fluoride amount and morphology of catalyst. It is found that the FG-1100 catalyst possesses a more positive onset potential, higher current density and better four-electron process for ORR than other FG samples. FG-1100 displays an outstanding ORR catalytic activity that is comparable to that of the commercial Pt/C catalyst. Also, its durability and methanol tolerance ability are superior to those of the commercial Pt/C. The excellent ORR catalytic performance is closely related to its higher doped fluorine amount and wrinkle morphology. The FG catalyst can be developed as a low-cost, efficient and durable catalyst as a viable replacement for the Pt/C catalyst, promoting the commercialization of fuel cells