过电位
电催化剂
兴奋剂
空位缺陷
密度泛函理论
催化作用
材料科学
氧气
纳米技术
石墨烯
析氧
化学
碳纤维
化学工程
无机化学
电化学
光电子学
电极
计算化学
结晶学
复合数
物理化学
有机化学
复合材料
工程类
作者
Qichen Wang,Yujin Ji,Yongpeng Lei,Yaobing Wang,Yingde Wang,Youyong Li,Shuangyin Wang
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2018-04-05
卷期号:3 (5): 1183-1191
被引量:465
标识
DOI:10.1021/acsenergylett.8b00303
摘要
Identification of catalytic sites for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in carbon materials remains a great challenge. Here, we construct a pyridinic-N-dominated doped graphene with abundant vacancy defects. The optimized sample with an ultrahigh pore volume (3.43 cm3 g–1) exhibits unprecedented ORR activity with a half-wave potential of 0.85 V in alkaline. For the first time, density functional theory results indicate that the quadri-pyridinic N-doped carbon site synergized with a vacancy defect is the active site, which presents the lowest overpotential of 0.28 V for ORR and 0.28 V for OER. The primary Zn–air batteries display a maximum power density of 115.2 mW cm–2 and an energy density as high as 872.3 Wh kg–1. The rechargeable Zn–air batteries illustrate a low discharge–charge overpotential and high stability (>78 h). This work provides new insight into the correlation between the N configuration synergized with a vacancy defect in electrocatalysis.
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