副教授
硕士生导师
教师拼音名称:yujianhua
学历:博士研究生
学位:工学博士
职称:副教授
毕业院校:中科院上海硅酸盐研究所
邮箱:
2020-06-08 青岛科技大学毕业生最喜爱的老师
2019-12-31 青岛科技大学先进工作者
2016-12-31 青岛科技大学先进工作者
最后更新时间:..
关键字:REDUCTION REACTION; EVOLUTION REACTION; GRAPHENE; NITROGEN; EFFICIENT; WATER; MECHANISM; NANOSHEETS; CATALYSTS; ADSORPTION
摘要:Controllable designing of heteroatom-doped carboncatalysts provides an insightful strategy for boosting the perform-ance and kinetics of the oxygen reduction/evolution reaction(ORR/OER). However, the role of oxygen species is usuallyomitted. Herein, a facile oxygen engineering strategy is proposed totune the oxygen species in N-doped porous carbon nanofibers(NPCNFs-O) via a facile electrospinning method, in which beta-cyclodextrin acts as the pore inducer and oxygen regulator.Benefitting from the large specific surface area and synergistic effectof N,O codoping, the NPCNF-O catalyst exhibits superior ORR(E1/2= 0.85 V vs reversible hydrogen electrode (RHE)) and OER(Ej=10= 1.556 V vs RHE) activities with excellent stability. Bothexperimental and theoretical calculations verify the crucial role ofcarboxyl groups, which regulate the local charge density and reduce the reaction energy barrier for enhancing the oxygenelectrocatalytic activity. Moreover, a rechargeable zinc-air battery using NPCNF-O as the air cathode demonstrates a maximumpower density of 125.1 mW cm-2and long-term durability. Importantly, NPCNF-O can be served as an integrated freestandingelectrode for portable zinc-air batteries. The work brings brilliant fundamental insights for constructing efficient metal-free carbonmaterial catalysts for future energy conversion and storage systems.
卷号:12
期号:7
是否译文:否